PACE^®​ Select Advisors Trust

Prospectus | November 28, 2023

•  PACE^®​ Mortgage-Backed Securities Fixed Income Investments
Class: A: PFXAX, Y: PFXYX

•  PACE^®​ Intermediate Fixed Income Investments
Class: A: PIFAX, Y: PIFYX

•  PACE^®​ Strategic Fixed Income Investments
Class: A: PBNAX, Y: PSFYX

•  PACE^®​ Municipal Fixed Income Investments
Class: A: PMUAX, Y: PMUYX

•  PACE^®​ Global Fixed Income Investments
Class: A: PWFAX, Y: PWFYX

•  PACE^®​ High Yield Investments
Class: A: PHIAX, Y: PHDYX

•  PACE^®​ Large Co Value Equity Investments
Class: A: PCPAX, Y: PLVYX

•  PACE^®​ Large Co Growth Equity Investments
Class: A: PLAAX, Y: PLAYX

•  PACE^®​ Small/Medium Co Value Equity Investments
Class: A: PEVAX, Y: PVEYX

•  PACE^®​ Small/Medium Co Growth Equity Investments
Class: A: PQUAX, Y: PUMYX

•  PACE^®​ International Equity Investments
Class: A: PWGAX, Y: PWIYX

•  PACE^®​ International Emerging Markets Equity Investments
Class: A: PWEAX, Y: PWEYX

•  PACE^®​ Global Real Estate Securities Investments
Class: A: PREAX

•  PACE^®​ Alternative Strategies Investments
Class: A: PASIX, Y: PASYX

This prospectus offers Class A and Class Y shares in all the funds listed above (except PACE^®​ Global Real Estate Securities Investments for which this prospectus offers Class A shares). Each class has different sales charges and ongoing expenses. You can choose the class that is best for you based on how much you plan to invest and how long you plan to hold your fund shares. Class Y shares are available only to certain types of investors.

The Securities and Exchange Commission and the Commodity Futures Trading Commission have not approved or disapproved any fund's shares or determined whether this prospectus is complete or accurate. To state otherwise is a crime.

Not FDIC Insured. May lose value. No bank guarantee.

Contents

The funds

What every investor should know about the funds

Fund summaries				Page
• PACE Mortgage-Backed Securities Fixed Income Investments					4
• PACE Intermediate Fixed Income Investments					9
• PACE Strategic Fixed Income Investments					15
• PACE Municipal Fixed Income Investments					22
• PACE Global Fixed Income Investments					26
• PACE High Yield Investments					32
• PACE Large Co Value Equity Investments					37
• PACE Large Co Growth Equity Investments					41
• PACE Small/Medium Co Value Equity Investments					46
• PACE Small/Medium Co Growth Equity Investments					50
• PACE International Equity Investments					54
• PACE International Emerging Markets Equity Investments					60
• PACE Global Real Estate Securities Investments					66
• PACE Alternative Strategies Investments					71
More information about the funds
Investment objectives and principal strategies					79
• PACE Mortgage-Backed Securities Fixed Income Investments					79
• PACE Intermediate Fixed Income Investments					81
• PACE Strategic Fixed Income Investments					84
• PACE Municipal Fixed Income Investments					88
• PACE Global Fixed Income Investments					90
• PACE High Yield Investments					92
• PACE Large Co Value Equity Investments					94
• PACE Large Co Growth Equity Investments					97
• PACE Small/Medium Co Value Equity Investments					101
• PACE Small/Medium Co Growth Equity Investments					104
• PACE International Equity Investments					106
• PACE International Emerging Markets Equity Investments					109
• PACE Global Real Estate Securities Investments					112
• PACE Alternative Strategies Investments					114
Additional information about investment objectives, principal risks and investment strategies					120

Your investment				Page
Information for managing your fund account
• Managing your fund account					134
• Flexible pricing					134
• Buying shares					140
• Selling shares					141
• Exchanging shares					142
• Transfer agent					142
• Additional information about your account					143
• Market timing					144
• Pricing and valuation					145
Additional information
Additional important information about the funds
• Management					147
• Other information					166
• Dividends and taxes					167
• Disclosure of portfolio holdings					168
• Financial highlights					169
• Appendix A: Intermediary-Specific Sales Charge Waivers and Discounts					A-1
• Where to learn more about the funds					Back cover

The funds are not complete or balanced investment programs.

PACE Mortgage-Backed Securities Fixed Income Investments Fund summary

Investment objective

Current income.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" beginning on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" beginning on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					3.75	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.45	%			0.45	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.43				0.50
Total annual fund operating expenses					1.13				0.95
Management fee waiver/expense reimbursements3​					0.16				0.23
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					0.97				0.72

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 0.97% for Class A and 0.72% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	470			$	705			$	959			$	1,684
Class Y					74				280				503				1,145

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 919% of the average value of its portfolio.

Principal strategies
Principal investments

Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in a diversified portfolio of mortgage-related fixed income instruments, including mortgage-backed securities (including mortgage pass-through securities and collateralized mortgage obligations ("CMOs"), commercial mortgage-backed securities, "to be announced" (or "TBA") securities and mortgage dollar rolls). The mortgage-backed securities in which the fund may invest include those issued or guaranteed by US government agencies or instrumentalities or private entities.

The fund also may invest in other types of investment grade fixed income instruments (or unrated bonds of equivalent quality).

TBA securities are mortgage-backed securities that usually are traded on a forward commitment basis with an approximate principal amount and no defined maturity date, issued or guaranteed by US government agencies and instrumentalities. The fund also may engage in TBA and Treasury "roll" transactions. A TBA roll transaction is a strategy whereby the fund decides to sell one TBA security and buy another TBA security due at a later date (Treasury roll transactions differ in that the underlying securities are US Treasury securities). The fund also may invest in when-issued or delayed delivery bonds to increase its return, giving rise to a form of leverage.

The fund invests in bonds of varying maturities, but normally limits its portfolio duration to within +/- 50% of the effective duration of the fund's benchmark index, Bloomberg US Mortgage-Backed Securities Index, which as of July 31, 2023 was approximately 6.12 years and may change over time. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means that changes in market interest rates are likely to have a larger effect on the value of the fund's portfolio.

The fund may engage in "short-selling" with respect to securities issued by the US Treasury and certain TBA securities coupon trades. For example, the fund may take a short position in TBA securities as a means of profiting if the underlying mortgages decline in value.

the fund and/or by changing the specific subadvisors within the fund.

The subadvisor utilizes a strategy that involves buying or selling specific bonds based on an analysis of their values relative to other similar bonds.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

Mortgage-related securities risk: Mortgage-related securities, including mortgage-backed securities, are subject to risks that are different from and/or more acute than risks associated with other types of debt instruments. Such risks may include prepayment risk, as discussed above. Conversely, in periods of rising interest rates, the fund may be subject to extension risk, and may receive principal later than expected, causing additional volatility. During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and become illiquid. Certain types of mortgage-backed securities (e.g., CMOs, as applicable) can be even more volatile and may be more sensitive to the rate of prepayments than other mortgage-related securities. The risk of default for "sub-prime" mortgages is generally higher than other types of mortgage-backed securities. The structure of some of these securities may be complex, and there may be less available information than other types of debt securities.

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial

obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.

Prepayment risk: The fund's mortgage- and asset-backed securities, as applicable, may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value.

Arbitrage trading risk: The underlying relationships between securities in which the fund takes arbitrage investment positions may change in an adverse manner, causing the fund to realize losses.

Short sales risk: There are certain unique risks associated with the use of short sales strategies. When selling a security short, the fund will sell a security it does not own at the then-current market price and then borrow the security to deliver to the buyer. The fund is then obligated to buy the security on a later date so it can return the security to the lender. Short sales therefore involve the risk that the fund will incur a loss by subsequently buying a security at a higher price than the price at which the fund previously sold the security short. This would occur if the securities lender required the fund to deliver the securities the fund had borrowed at the commencement of the short sale and the fund was unable to either purchase the security at a favorable price or to borrow the security from another securities lender. If this occurs at a time when other short sellers of the security also want to close out their positions, a "short squeeze" can occur. A short squeeze occurs when demand is greater than supply for the security sold short. Moreover, because a fund's loss on a short sale arises from increases in the value of the security sold short, such loss, like the price of the security sold short, is theoretically unlimited. By contrast, a fund's loss on a long position arises from decreases in the value of the security and therefore is limited by the fact that a security's value cannot drop below zero. It is possible that the fund's securities held long will decline in value at the same time that the value of the securities sold short increases, thereby increasing the potential for loss.

Portfolio turnover risk: The fund engages in frequent trading from time to time, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short-term gains for shareholders, which may have an adverse impact on performance.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk: The risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Leverage risk associated with financial instruments and practices: The use of certain financial instruments, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), and the engagement in certain practices, such as the investment of proceeds received in connection with short sales, to increase potential returns may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM

and/or a subadvisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Pacific Investment Management Company LLC ("PIMCO") assumed day-to-day management of the fund's assets in June 1995. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Mortgage-Backed Securities Fixed Income Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: (2.23)%
Best quarter during calendar years shown—2Q 2020: 2.54%
Worst quarter during calendar years shown—1Q 2022: (5.88)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (1/31/01) Return before taxes					(16.94	)%			(1.62	)%			0.04	%
Return after taxes on distributions					(18.03	)			(2.83	)			(1.06	)
Return after taxes on distributions and sale of fund shares					(10.01	)			(1.68	)			(0.41	)
Class Y (2/2/01) Return before taxes					(13.49	)			(0.61	)			0.68
Bloomberg US Mortgage-Backed Securities Index (Index reflects no deduction for fees, expenses or taxes.)					(11.81	)			(0.53	)			0.74

Investment manager and advisor(s)

UBS AM serves as the fund's manager. PIMCO serves as the fund's subadvisor. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS Asset Management (UK) Ltd ("UBS AM (UK)"), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  PIMCO—Daniel Hyman, Managing Director and Lead Portfolio Manager, and Michael Cudzil, Managing Director and Portfolio Manager, have been portfolio managers of the fund since 2013.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Intermediate Fixed Income Investments
Fund summary

Investment objective

Current income, consistent with reasonable stability of principal.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					3.75	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.45	%			0.45	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.39				0.58
Total annual fund operating expenses					1.09				1.03
Management fee waiver/expense reimbursements3​					0.23				0.42
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					0.86				0.61

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 0.86% for Class A and 0.61% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	459			$	687			$	932			$	1,634
Class Y					62				286				528				1,221

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 214% of the average value of its portfolio.*

*  Portfolio turnover with respect to to-be-announced securities for the fund are not reflected in the fund's financial statements, and therefore the portfolio turnover listed above differs from that presented in the fund's financial highlights.

Principal strategies
Principal investments

Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in fixed income securities, which may be represented by derivatives or investments in securities of other investment companies that invest primarily in fixed income securities. Such investments may include US government and foreign government bonds (including bonds issued by supranational and quasi-governmental entities and mortgage-backed securities), municipal fixed income investments (including tax-exempt municipal securities), corporate bonds (including mortgage- and asset-backed securities of private issuers, Eurodollar certificates of deposit, Eurodollar bonds and Yankee bonds) and bank loans. There are different types of US government securities, including those issued or guaranteed by the US government, its agencies and its instrumentalities, and they have different types of government support. Some are supported by the full faith and credit of the US, while others are supported by (1) the ability of the issuer to borrow from the US Treasury; (2) the credit of the issuing agency, instrumentality or government-sponsored entity; (3) pools of assets, such as mortgages; or (4) the US government in some other way.

The fund may invest in bonds that are investment grade at the time of purchase. The fund may also invest, in the aggregate, up to 20% of its total assets (measured at the time of purchase) in (1) bonds that are below investment grade at the time of purchase (or unrated bonds of equivalent quality) (commonly known as "junk bonds"), (2) non-US dollar denominated securities, and (3) fixed income securities of issuers located in emerging markets. The fund may also invest in equity securities, such as preferred shares and securities convertible into stocks.

The fund invests in bonds of varying maturities. It normally limits its overall portfolio duration to within +/- 50% of the duration of the Bloomberg US Aggregate Bond Index, which as of July 31, 2023 was

strengths. The most attractive sub-set of those subadvisors is then selected for in-depth, on-site due diligence meetings with representatives from the investment, operations and compliance groups within UBS AM. The due diligence information is then synthesized to select the most attractive candidate(s) for the fund, subject to the board's approval.

In managing the fund and overseeing the fund's subadvisor(s), UBS AM views its research process as an ongoing one, as the team continually seeks to confirm a subadvisor's investment thesis over the appropriate investment horizon. In general, UBS AM leverages its research and market knowledge to construct funds with exposure to various subadvisors that are expected, in combination, to produce the desired overall fund characteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The subadvisor utilizes a strategy that seeks to invest in a diversified portfolio of fixed income instruments that are performing, durable, and available at an attractive valuation, including floating or variable rate debt instruments.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the

counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

High yield securities ("junk bonds") risk: Lower-rated securities (the issuers of which are typically in poorer financial health) are subject to higher risks than investment grade securities. For example, lower-rated securities may be (1) subject to a greater risk of loss of principal and non-payment of interest (including default by the issuer); (2) subject to greater price volatility; and (3) less liquid than investment grade securities. The prices of such securities may be more vulnerable to bad economic news, or even the expectation of bad news, than higher rated fixed income securities.

Mortgage-related securities risk: Mortgage-related securities, including mortgage-backed securities, are subject to risks that are different from and/or more acute than risks associated with other types of debt instruments. Such risks may include prepayment risk, as discussed above. Conversely, in periods of rising interest rates, the fund may be subject to extension risk, and may receive principal later than expected, causing additional volatility. During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and become illiquid. Certain types of mortgage-backed securities (e.g., CMOs, as applicable) can be even more volatile and may be more sensitive to the rate of prepayments than other mortgage-related securities. The risk of default for "sub-prime" mortgages is generally higher than other types of mortgage-backed securities. The structure of some of these securities may be complex, and there may be less available information than other types of debt securities.

Prepayment risk: The fund's mortgage- and asset-backed securities, as applicable, may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value.

US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.

Municipal securities risk: Municipal securities are subject to interest rate and credit risks. The ability of a municipal issuer to make payments and the value of municipal securities can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the fund's net asset value and/or the distributions paid by the fund. Municipal bonds secured by revenues from public housing authorities may be subject to additional uncertainties relating to the possibility that proceeds may exceed supply of available mortgages to be purchased by public housing authorities, resulting in early retirement of bonds, or that homeowner repayments will create an irregular cash flow. Municipalities continue to experience difficulties in the current economic and political environment.

Structured security risk: The fund may purchase securities representing interests in underlying assets, but structured to provide certain advantages not inherent in those assets (e.g., enhanced liquidity and yields linked to short-term interest rates). If those securities behaved in a way that the fund's investment advisor did not anticipate, or if the security structures encountered unexpected difficulties, the fund could suffer a loss.

Investment company risk: Investments in open- or closed-end investment companies, including exchange-traded funds ("ETFs"), involve certain risks. The shares of other investment companies are subject to the management fees and other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads and (in the case of closed-end investment companies) sometimes substantial premiums above the value of such companies' portfolio securities.

Portfolio turnover risk: The fund engages in frequent trading from time to time, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short term gains for shareholders, which may have an adverse impact on performance.

Loan investments risk: In addition to those risks typically associated with investments in debt securities, investments in bank loans are subject to the risk that the collateral securing a loan may not provide sufficient protection to the fund. With respect to participations in loans, the fund's contractual relationship is typically with the lender (rather than the borrower). Consequently, the fund may have limited rights of enforcement against the borrower and assumes the credit risk of both the lender and the borrower. The market for bank loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods that may be longer than seven days. Investments in bank loans may

be relatively illiquid, which could adversely affect the value of these investments and the fund's ability to dispose of them.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. Preferred stocks in which the fund may invest are also sensitive to interest rate changes. The rights of preferred stocks on the distribution of a company's assets in the event of a liquidation are generally subordinate to the rights associated with a company's debt securities. The fund could lose all of its investment in a company's stock.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk: The risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Derivatives risk: The value of derivatives—so called because their value derives from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of investing in derivative instruments also include market, leverage, operational, legal, and management risks. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other derivatives may be subject to liquidity risk, counterparty risk, credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments. Regulation relating to a mutual fund's use of derivatives and related instruments, including Rule 18f-4 under the Investment Company Act of 1940, as amended, could potentially limit or impact the fund's ability to invest in derivatives, limit the fund's ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the fund's performance.

Swap agreement risk: The fund may enter into various types of swap agreements. Swap agreements can be less liquid and more difficult to value than other investments. Because its cash flows are based in part on changes in the value of the reference asset, a swap's market value will vary with changes in that reference asset. In addition, the fund may experience delays in payment or loss of income if the counterparty fails to perform under the contract. Central clearing, required margin for uncleared swaps and other requirements are expected to decrease counterparty risk and increase liquidity compared to over-the-counter swaps. However, these requirements do not eliminate counterparty risk or illiquidity risk entirely.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that another subadvisor was responsible for managing the fund's assets during previous periods. Brown Brothers Harriman & Co., acting through a separately identifiable department known as the Brown Brothers Harriman Mutual Fund Advisory Department ("BBH"), assumed day-to-day management of the fund's assets on August 12, 2022. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Intermediate Fixed Income Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: 0.33%
Best quarter during calendar years shown—2Q 2020: 4.35%
Worst quarter during calendar years shown—1Q 2022: (6.09)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (1/31/01) Return before taxes					(16.84	)%			(1.23	)%			0.04	%
Return after taxes on distributions					(17.66	)			(2.27	)			(0.81	)
Return after taxes on distributions and sale of fund shares					(9.96	)			(1.26	)			(0.28	)
Class Y (2/2/01) Return before taxes					(13.38	)			(0.22	)			0.67
Bloomberg US Aggregate Bond Index (Index reflects no deduction for fees, expenses or taxes.)					(13.01	)			0.02				1.06

Investment manager and advisor(s)

UBS AM serves as the fund's manager. BBH serves as the fund's subadvisor. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  BBH—Andrew Hofer, Principal, Neil Hohmann, Principal, and Paul Kunz, Principal, have been portfolio managers of the fund since 2022.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Strategic Fixed Income Investments
Fund summary

Investment objective

Total return consisting of income and capital appreciation.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					3.75	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A								Class Y
Management fees									0.42	%							0.42	%
Distribution and/or service (12b-1) fees									0.25								None
Other expenses									0.45								0.61
Miscellaneous expenses (includes administration fee of 0.10%)2​					0.30								0.46
Interest expense					0.15								0.15
Total annual fund operating expenses									1.12								1.03
Management fee waiver/expense reimbursements3​									0.07								0.23
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​									1.05								0.80

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 0.90% for Class A and 0.65% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	478			$	711			$	962			$	1,681
Class Y					82				305				546				1,239

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 376% of the average value of its portfolio.

Principal strategies
Principal investments

The fund invests in bonds of varying maturities, but normally limits its portfolio duration to within +/- 50% of the effective duration of the fund's benchmark index, Bloomberg US Government/Credit Index, which as of July 31, 2023 was approximately 6.39 years and may change over time. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means that changes in market interest rates are likely to have a larger effect on the value of the fund's portfolio.

Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in investment grade fixed income securities, which may be represented by derivatives or investments in securities of other investment companies that invest primarily in fixed income securities. Such investments may include US government bonds, bonds that are backed by mortgages and other assets, bonds (including convertible bonds) of US and foreign private issuers, foreign government bonds (including bonds issued by supranational and quasi-governmental entities), foreign currency exchange-related securities, repurchase agreements, municipals, structured notes, bank loans, and money market instruments (including commercial paper and certificates of deposit). There are different types of US government securities, including those issued or guaranteed by the US government, its agencies and its instrumentalities, and they have different types of government support. Some are supported by the full faith and credit of the US, while others are supported by (1) the ability of the issuer to borrow from the US Treasury; (2) the credit of the issuing agency, instrumentality or government-sponsored entity; (3) pools of assets, such as mortgages; or (4) the US government in some other way. The fund may also

tion primarily from internal sources and the team's collective knowledge of the industry, but also supplemented by external sources. The team then focuses its research on that list to identify a small number of the most attractive candidates. This research includes analyzing the portfolio holdings and/or positioning of a subadvisor's investment strategy to understand whether the allocation of risk and the drivers of alpha are consistent with the subadvisor's investment philosophy and stated strengths. The most attractive sub-set of those subadvisors is then selected for in-depth, on-site due diligence meetings with representatives from the investment, operations and compliance groups within UBS AM. The due diligence information is then synthesized to select the most attractive candidate(s) for the fund, subject to the board's approval.

In managing the fund and overseeing the fund's subadvisor(s), UBS AM views its research process as an ongoing one, as the team continually seeks to confirm a subadvisor's investment thesis over the appropriate investment horizon. In general, UBS AM leverages its research and market knowledge to construct funds with exposure to various subadvisors that are expected, in combination, to produce the desired overall fund characteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The main strategies of the subadvisors include:

•  A strategy that focuses on those areas of the bond market that the subadvisor considers undervalued.

•  An "opportunistic fixed income" strategy that employs a consistently applied, risk managed approach to portfolio management that leverages the subadvisor's proprietary fundamental research capabilities, decision making frameworks and quantitative risk management tools.

•  A strategy that seeks to invest in a diversified portfolio of fixed income instruments that are performing, durable, and available at an attractive valuation, including floating or variable rate debt instruments.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The principal risks presented by an investment in the fund are:

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

High yield securities ("junk bonds") risk: Lower-rated securities (the issuers of which are typically in poorer financial health) are subject to higher risks than investment grade securities. For example, lower-rated securities may be (1) subject to a greater risk of loss of principal and non-payment of interest (including default by the issuer); (2) subject to greater price volatility; and (3) less liquid than investment grade securities. The prices of such securities may be more vulnerable to bad economic news, or even the expectation of bad news, than higher rated fixed income securities.

Mortgage-related securities risk: Mortgage-related securities, including mortgage-backed securities, are subject to risks that are different from and/or more acute than risks associated with other types of debt instruments. Such risks may include prepayment risk, as discussed above. Conversely, in periods of rising interest rates, the fund may be subject to extension risk, and may receive principal later than expected, causing additional volatility. During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and become illiquid. Certain types of mortgage-backed securities (e.g., CMOs, as applicable) can be even more volatile and may be more sensitive to the rate of prepayments than other mortgage-related securities. The risk of default for "sub-prime" mortgages is generally higher than other types of mortgage-backed securities. The structure of some of these securities may be complex, and there may be less available information than other types of debt securities.

Prepayment risk: The fund's mortgage- and asset-backed securities, as applicable, may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value.

US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.

Structured security risk: The fund may purchase securities representing interests in underlying assets, but structured to provide certain advantages not inherent in those assets (e.g., enhanced liquidity and yields linked to short-term interest rates). If those securities behaved in a way that the fund's investment advisors did not anticipate, or if the security structures encountered unexpected difficulties, the fund could suffer a loss.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Foreign currency risk: The value of non-US dollar denominated securities held by the fund may be affected by changes in exchange rates or control regulations. If a local currency declines against the US dollar, the value of the holding decreases in US dollar terms. In addition, the fund may be exposed to losses if its other foreign currency positions (e.g., options, forward commitments) move against it.

Sovereign debt risk: Investment in sovereign debt involves special risks, including the risk that the issuer of the debt or the governmental authorities that control the repayment of the debt may be unable or unwilling to repay principal and/or interest when due in accordance with the terms of such debt, and the fund may have limited legal recourse in the event of a default.

Municipal securities risk: Municipal securities are subject to interest rate and credit risks. The ability of a municipal issuer to make payments and the value of

municipal securities can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the fund's net asset value and/or the distributions paid by the fund. Municipal bonds secured by revenues from public housing authorities may be subject to additional uncertainties relating to the possibility that proceeds may exceed supply of available mortgages to be purchased by public housing authorities, resulting in early retirement of bonds, or that homeowner repayments will create an irregular cash flow. Municipalities continue to experience difficulties in the current economic and political environment.

Repurchase agreements risk. Repurchase agreements carry certain risks not associated with direct investments in securities, including a possible decline in the market value of the underlying obligations. Repurchase agreements involving obligations other than US government securities (such as commercial paper, corporate bonds, mortgage loans and equities) may be subject to special risks and may not have the benefit of certain protections in the event of the counterparty's insolvency. If the seller or guarantor becomes insolvent, the fund may suffer delays, costs and possible losses in connection with the disposition of collateral.

Investment company risk: Investments in open- or closed-end investment companies, including ETFs, involve certain risks. The shares of other investment companies are subject to the management fees and other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads and (in the case of closed-end investment companies) sometimes substantial premiums above the value of such companies' portfolio securities.

Loan investments risk: In addition to those risks typically associated with investments in debt securities, investments in bank loans are subject to the risk that the collateral securing a loan may not provide sufficient protection to the fund. With respect to participations in loans, the fund's contractual relationship is typically with the lender (rather than the borrower). Consequently, the fund may have limited rights of enforcement against the borrower and assumes the credit risk of both the lender and the borrower. The market for bank loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods that may be longer than seven days. Investments in bank loans may be relatively illiquid, which could adversely affect the value of these investments and the fund's ability to dispose of them.

Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. Preferred stocks in which the fund may invest are also sensitive to interest rate

changes. The rights of preferred stocks on the distribution of a company's assets in the event of a liquidation are generally subordinate to the rights associated with a company's debt securities. The fund could lose all of its investment in a company's stock.

Portfolio turnover risk: The fund engages in frequent trading from time to time, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short-term gains for shareholders, which may have an adverse impact on performance.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk: Certain of the fund's investments may present liquidity risk. Liquidity risk involves the risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Derivatives risk: The value of derivatives—so called because their value derives from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of investing in derivative instruments also include market, leverage, operational, legal, and management risks. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other derivatives may be subject to liquidity risk, counterparty risk, credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments. Regulation relating to a mutual fund's use of derivatives and related instruments, including Rule 18f-4 under the Investment Company Act of 1940, as amended, could potentially limit or impact the fund's ability to invest in derivatives, limit the fund's ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the fund's performance.

Swap agreement risk: The fund may enter into various types of swap agreements. Swap agreements can be less liquid and more difficult to value than other investments. Because its cash flows are based in part on changes in the value of the reference asset, a swap's market value will vary with changes in that reference asset. In addition, the fund may experience delays in payment or loss of income if the counterparty fails to perform under the contract. Central clearing, required margin for uncleared swaps and other requirements are expected to decrease counterparty risk and increase liquidity compared to over-the-counter swaps. However, these requirements do not eliminate counterparty risk or illiquidity risk entirely.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Multi-manager risk: The investment styles and strategies of the fund's subadvisors may not complement each other as expected by the fund's manager. The same security may be held by different subadvisors, or may be acquired by one subadvisor while another sub-

advisor of the fund decides to sell the same security. Subadvisors may have different views on the market causing them to make different investment decisions. For example, a subadvisor may determine that it is appropriate to take a temporary defensive position in short-term cash instruments at a time when another subadvisor deems it appropriate to maintain or increase market exposure. Because each subadvisor independently places trades for the fund, the fund may incur higher brokerage costs than would be the case if the fund only had one subadvisor. In addition, UBS AM may be subject to potential conflicts of interests in allocating fund assets because it pays different fees to the subadvisors which could impact its revenues.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that other subadvisors were responsible for managing portions of the fund's assets during previous periods. Pacific Investment Management Company LLC ("PIMCO") assumed day-to-day management of a separate portion of the fund's assets on August 24, 1995. Neuberger Berman Investment Advisers LLC ("Neuberger Berman") assumed day-to-day management of a separate portion of the fund's assets on January 21, 2015. Brown Brothers Harriman & Co., acting through a separately identifiable department known as the Brown Brothers Harriman Mutual Fund Advisory Department ("BBH"), assumed day-to-day management of a separate portion of the fund's assets on August 12, 2022. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Strategic Fixed Income Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: 0.61%
Best quarter during calendar years shown—2Q 2020: 5.38%
Worst quarter during calendar years shown—1Q 2022: (6.31)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (12/11/00) Return before taxes					(17.33	)%			(0.63	)%			0.65	%
Return after taxes on distributions					(18.35	)			(2.06	)			(0.75	)
Return after taxes on distributions and sale of fund shares					(10.24	)			(1.00	)			(0.05	)
Class Y (2/2/01) Return before taxes					(13.86	)			0.40				1.27
Bloomberg US Government/Credit Index (Index reflects no deduction for fees, expenses or taxes.)					(13.58	)			0.21				1.16

Investment manager and advisor(s)

UBS AM serves as the fund's manager. PIMCO, Neuberger Berman and BBH currently serve as the fund's subadvisors. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  PIMCO—Mohit Mittal, Managing Director of PIMCO, has been a portfolio manager of the fund since 2021. Michael Cudzil, Managing Director of PIMCO, and Marc Seidner, Managing Director of PIMCO, have been portfolio managers of the fund since 2022.

•  Neuberger Berman—Thanos Bardas, David M. Brown and Bradley C. Tank, each a Managing Director of Neuberger Berman, have been portfolio managers of the fund since 2015. Ashok Bhatia, Managing Director, has been a portfolio manager of the fund since 2017. Adam Grotzinger, Managing Director, has been a portfolio manager of the fund since 2019.

•  BBH—Andrew Hofer, Principal, Neil Hohmann, Principal, and Paul Kunz, Principal, have been portfolio managers of the fund since 2022.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Municipal Fixed Income Investments
Fund summary

Investment objective

High current income exempt from federal income tax.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					2.25	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.40	%			0.40	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.25				1.00
Total annual fund operating expenses					0.90				1.40
Management fee waiver/expense reimbursements3​					0.08				0.83
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					0.82				0.57

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²  ​"Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 0.82% for Class A and 0.57% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	307			$	498			$	705			$	1,301
Class Y					58				361				687				1,608

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 11% of the average value of its portfolio.

Principal strategies
Principal investments

Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in municipal fixed income investments, the income from which is exempt from regular federal income taxes. The fund invests principally in investment grade municipal bonds of varying maturities. Normally, the fund limits its investments in municipal bonds that are subject to the federal alternative minimum tax ("AMT") so that not more than 25% of its interest income will be subject to the AMT, and invests in these bonds when its investment advisor believes that they offer attractive yields relative to similar municipal bonds that are not subject to the AMT.

The fund normally limits its portfolio duration to between three and seven years. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means that changes in market interest rates are likely to have a larger effect on the value of the fund's portfolio.

The fund may invest up to 50% of its total assets in municipal bonds that are secured by revenues from public housing authorities and state and local housing finance authorities, including bonds that are secured or backed by the US Treasury or other US government guaranteed securities. There are different types of US government securities, including those issued or guaranteed by the US government, its agencies and its instrumentalities, and they have different types of government support. Some are supported by the full faith and credit of the US, while others are supported by (1) the ability of the issuer to borrow from the US Treasury; (2) the credit of the issuing agency, instrumentality or government-sponsored entity; (3) pools of assets, such as mortgages; or (4) the US government in some other way.

The fund limits its investments in municipal bonds with the lowest investment grade rating (or unrated bonds of equivalent quality) to 15% of its total assets at the time the bonds are purchased. Municipal bonds that are downgraded to a below investment grade rating (or equivalent quality) after the initial purchase of such bonds may continue to be held in the fund's portfolio.

Management process

The fund employs a "manager of managers" structure. UBS Asset Management (Americas) Inc. ("UBS AM"), the fund's manager and primary provider of investment advisory services, has the ultimate authority, subject to oversight by the fund's board, to oversee the fund's subadvisor(s) and recommend their hiring, termination and replacement, and to allocate assets among the fund's subadvisor(s).

UBS AM's investment process begins with subadvisor selection. UBS AM's portfolio management team constructs a list of potential subadvisors based on information primarily from internal sources and the team's collective knowledge of the industry, but also supplemented by external sources. The team then focuses its research on that list to identify a small number of the most attractive candidates. This research includes analyzing the portfolio holdings and/or positioning of a subadvisor's investment strategy to understand whether the allocation of risk and the drivers of alpha are consistent with the subadvisor's investment philosophy and stated strengths. The most attractive sub-set of those subadvisors is then selected for in-depth, on-site due diligence meetings with representatives from the investment, operations and compliance groups within UBS AM. The due diligence information is then synthesized to select the most attractive candidate(s) for the fund, subject to the board's approval.

In managing the fund and overseeing the fund's subadvisor(s), UBS AM views its research process as an ongoing one, as the team continually seeks to confirm a subadvisor's investment thesis over the appropriate investment horizon. In general, UBS AM leverages its research and market knowledge to construct funds with exposure to various subadvisors that are expected, in combination, to produce the desired overall fund characteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The subadvisor utilizes a strategy that involves investing in undervalued sectors, geographical regions or individual securities.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The principal risks presented by an investment in the fund are:

Municipal securities risk: Municipal securities are subject to interest rate and credit risks. The ability of a municipal issuer to make payments and the value of municipal securities can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the fund's net asset value and/or the distributions paid by the fund. Municipal bonds secured by revenues from public housing authorities may be subject to additional uncertainties relating to the possibility that proceeds may exceed supply of available mortgages to be purchased by public housing authorities, resulting in early retirement of bonds, or that homeowner repayments will create an irregular cash flow. Municipalities continue to experience difficulties in the current economic and political environment.

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

Related securities concentration risk: Because the fund may invest more than 25% of its total assets in municipal bonds that are issued to finance similar projects, changes that affect one type of municipal bond may have a significant impact on the value of the fund.

US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities

that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.

Prepayment risk: The fund's mortgage- and asset-backed securities, as applicable, may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value.

Liquidity risk: Certain of the fund's investments may present liquidity risk. Liquidity risk involves the risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of

investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. A predecessor entity of Insight North America LLC ("Insight") assumed day-to-day management of the fund's assets in June 2000. Insight assumed day-to-day management of the fund's assets on September 1, 2021. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Municipal Fixed Income Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: (1.01)%
Best quarter during calendar years shown—4Q 2022: 3.49%
Worst quarter during calendar years shown—1Q 2022: (5.79)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (1/23/01) Return before taxes					(9.52	)%			0.38	%			1.27	%
Return after taxes on distributions					(10.26	)			(0.02	)			1.02
Return after taxes on distributions and sale of fund shares					(5.64	)			0.48				1.35
Class Y (2/23/01) Return before taxes					(7.33	)			1.08				1.74
Bloomberg US Municipal 3-15 Year Blend Index (Index reflects no deduction for fees, expenses or taxes.)					(6.40	)			1.48				2.07

Investment manager and advisor(s)

UBS AM serves as the fund's manager. Insight serves as the fund's subadvisor. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  Insight—Daniel Marques, CFA and Senior Portfolio Manager, and Daniel Rabasco, CFA, Head of Municipal Bonds, have been portfolio managers of the fund since 2017.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends you receive from the fund generally are not subject to federal income tax. If the fund distributes any capital gains, those gains are generally subject to federal income tax. If you are subject to alternative minimum tax, a portion of the dividends paid by the fund may be included in computing such taxes. Please consult with your tax advisor regarding your personal circumstances.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Global Fixed Income Investments
Fund summary

Investment objective

High total return.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					3.75	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.50	%			0.50	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.48				0.59
Total annual fund operating expenses					1.23				1.09
Management fee waiver/expense reimbursements3​					0.20				0.22
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					1.03				0.87

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 1.03% for Class A and 0.87% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	476			$	732			$	1,007			$	1,791
Class Y					89				325				580				1,309

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 189% of the average value of its portfolio.

Principal strategies
Principal investments

Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in fixed income securities, which may be represented by derivatives or by investments in securities of other investment companies that invest primarily in fixed income securities. Such investments may include US government bonds, non-US government bonds (including bonds issued by supranational organizations and quasi-governmental entities), and bonds of US or non-US private issuers. The fund invests primarily in high-grade bonds of governmental and private issuers. These high-grade bonds are rated in one of the three highest rating categories or are of comparable quality. The fund invests, to a limited extent, in emerging market bonds and lower rated bonds of governmental and private issuers, including bonds that are rated below investment grade (commonly known as "junk bonds"). The fund normally invests in a minimum of four countries, including the United States.

The fund invests in bonds of varying maturities, but normally limits its portfolio duration to within +/- 50% of the effective duration of the fund's benchmark index, Bloomberg Global Aggregate Index, which as of July 31, 2023 was approximately 6.71 years and may change over time. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means that changes in market interest rates are likely to have a larger effect on the value of the fund's portfolio.

The fund's investments may include mortgage- and asset-backed securities. The fund may, but is not required to, use exchange-traded or over-the-counter derivative instruments for risk management purposes or to attempt to increase total returns. The derivatives in which the fund invests include futures (specifically, interest rate futures), swap agreements (specifically, interest rate swaps) and currency forward agreements. These derivatives may be used for risk management purposes, such as hedging the fund's currency exposure, or otherwise managing the risk profile of the fund. In addition, these derivative instruments may be used to enhance returns; in place of direct investments; or to obtain or adjust exposure to certain markets.

adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The subadvisor utilizes a strategy that involves investing primarily in global fixed income securities either directly or through the use of financial derivative instruments where appropriate.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Foreign custody risk: The fund may hold foreign securities and cash with foreign banks, agents and securities depositories. Such foreign banks or securities depositories may be subject to limited regulatory oversight. The laws of certain countries also may limit the fund's ability to recover its assets if a foreign bank or depository enters into bankruptcy.

Mortgage-related securities risk: Mortgage-related securities, including mortgage-backed securities, are subject to risks that are different from and/or more acute than risks associated with other types of debt instruments. Such risks may include prepayment risk, as discussed above. Conversely, in periods of rising interest rates, the fund may be subject to extension risk, and may receive principal later than expected, causing additional volatility. During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and become illiquid. Certain types of mortgage-backed securities (e.g., CMOs, as applicable) can be even more volatile and may be more sensitive to the rate of prepayments than other mortgage-related securities. The risk of default for "sub-prime" mortgages is generally higher than other types of mortgage-backed securities. The structure of some of these securities may be complex, and there may be less available information than other types of debt securities.

US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.

Sovereign debt risk: Investment in sovereign debt involves special risks, including the risk that the issuer of the debt or the governmental authorities that control the repayment of the debt may be unable or unwilling to repay principal and/or interest when due in accordance with the terms of such debt, and the fund may have limited legal recourse in the event of a default.

High yield securities ("junk bonds") risk: Lower-rated securities (the issuers of which are typically in poorer financial health) are subject to higher risks than investment grade securities. For example, lower-rated securities may be (1) subject to a greater risk of loss of principal and non-payment of interest (including default by the issuer); (2) subject to greater price volatility; and (3) less liquid than investment grade securities. The prices of such securities may be more vulnerable to bad economic news, or even the expectation of bad news, than higher rated fixed income securities.

Investment company risk: Investments in open- or closed-end investment companies, including ETFs, involve certain risks. The shares of other investment companies are subject to the management fees and

other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads and (in the case of closed-end investment companies) sometimes substantial premiums above the value of such companies' portfolio securities.

Prepayment risk: The fund's mortgage- and asset-backed securities, as applicable, may be prepaid more rapidly than expected, especially when interest rates are falling, and the fund may have to reinvest those prepayments at lower interest rates. When interest rates are rising, slower prepayments may extend the duration of the securities and may reduce their value.

Portfolio turnover risk: The fund engages in frequent trading from time to time, which can result in high portfolio turnover. A high portfolio turnover rate involves greater expenses to the fund, including transaction costs, and is likely to generate more taxable short-term gains for shareholders, which may have an adverse impact on performance.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk: Certain of the fund's investments may present liquidity risk. Liquidity risk involves the risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Derivatives risk: The value of derivatives—so called because their value derives from the value of an under-lying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of investing in derivative instruments also include market, leverage, operational, legal, and management risks. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other derivatives may be subject to liquidity risk, counterparty risk, credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments. Regulation relating to a mutual fund's use of derivatives and related instruments, including Rule 18f-4 under the Investment Company Act of 1940, as amended, could potentially limit or impact the fund's ability to invest in derivatives, limit the fund's ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the fund's performance.

Swap agreement risk: The fund may enter into various types of swap agreements. Swap agreements can be less liquid and more difficult to value than other investments. Because its cash flows are based in part on changes in the value of the reference asset, a swap's market value will vary with changes in that reference asset. In addition, the fund may experience delays in payment or loss of income if the counterparty fails to perform under the contract. Central clearing, required margin for uncleared swaps and other requirements are expected to decrease counterparty risk and increase liquidity compared to over-the-counter swaps. However, these requirements do not eliminate counterparty risk or illiquidity risk entirely.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The Bloomberg Global Aggregate ex USD 50% Hedged Index provides information regarding the effectiveness of the fund's historical currency hedging policy. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that other subadvisors were responsible for managing portions of the fund's assets during previous periods. J.P. Morgan Investment Management Inc. ("J.P. Morgan") assumed day-to-day management of the fund's assets on January 9, 2017. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Global Fixed Income Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: (4.19)%
Best quarter during calendar years shown—1Q 2016: 7.16%
Worst quarter during calendar years shown—4Q 2016: (9.68)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (12/11/00) Return before taxes					(18.80	)%			(2.47	)%			(1.28	)%
Return after taxes on distributions					(19.18	)			(3.28	)			(2.06	)
Return after taxes on distributions and sale of fund shares					(11.13	)			(2.10	)			(1.24	)
Class Y (1/16/01) Return before taxes					(15.56	)			(1.57	)			(0.73	)
Bloomberg Global Aggregate Index					(16.26	)			(1.66	)			(0.44	)
Bloomberg Global Aggregate ex USD 50% Hedged Index (Indices reflect no deduction for fees, expenses or taxes.)					(18.70	)			(3.07	)			1.64

Investment manager and advisor(s)

UBS AM serves as the fund's manager. J.P. Morgan serves as the fund's subadvisor. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  J.P. Morgan—Iain Stealey, CFA and Managing Director, and Linda Raggi, CFA and Executive Director, have been portfolio managers of the fund since 2017. Myles Bradshaw, CFA and Managing Director, has been a portfolio manager of the fund since 2019.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k)

plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS

AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE High Yield Investments
Fund summary

Investment objective

Total return.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $100,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					3.75	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.60	%			0.60	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.35				0.30
Total annual fund operating expenses					1.20				0.90
Management fee waiver/expense reimbursements3​					0.14				0.02
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					1.06				0.88

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 1.06% for Class A and 0.88% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	479			$	728			$	997			$	1,763
Class Y					90				285				497				1,106

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions or dealer spreads, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 33% of the average value of its portfolio.

Principal strategies
Principal investments

The fund seeks to achieve its objective by investing primarily in a professionally managed, diversified portfolio of fixed income securities rated below investment grade. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in high yield fixed income securities that are rated below investment grade or considered to be of comparable quality (commonly known as "junk bonds"). Such investments may be represented by derivatives or by investments in securities of other investment companies that invest primarily in such high yield fixed income securities.

These investments will include fixed income securities that are (1) rated below investment grade (lower than a Baa rating by Moody's Investors Service, Inc. ("Moody's") or lower than a BBB rating by Standard and Poor's, a division of The McGraw Hill Companies Inc. ("S&P")); (2) comparably rated by another nationally recognized statistical rating organization (collectively, with Moody's and S&P, "Rating Agencies"); or (3) unrated, but deemed by the fund's investment advisor to be of comparable quality to fixed income securities rated below Baa, BBB or a comparable rating by a Rating Agency.

The fund may also invest in other instruments, including exchange-traded funds ("ETFs"), that derive their value from such high yield fixed income securities.

The fund may invest up to 10% of its total assets in US and/or non-US senior secured bank loans (each of which may be denominated in foreign currencies), which may be in the form of loan participations and assignments. The fund may invest in a number of different countries throughout the world, including the US, Europe and emerging market countries.

Under normal circumstances, the fund's average duration will be within +/- 50% of that of the ICE BofA Global High Yield Index (Hedged in USD), which as of July 31, 2023 was approximately 3.46 years and may change over time. Duration is a measure of the fund's exposure to interest rate risk—a longer duration means

agement process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The subadvisor utilizes a "total return" strategy driven by credit research and a team effort to generate alpha in high yield.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

High yield securities ("junk bonds") risk: Lower-rated securities (the issuers of which are typically in poorer financial health) are subject to higher risks than investment grade securities. For example, lower-rated securities may be (1) subject to a greater risk of loss of principal and non-payment of interest (including default by the issuer); (2) subject to greater price volatility; and (3) less liquid than investment grade securities. The prices of such securities may be more vulnerable to bad economic news, or even the expectation of bad news, than higher rated fixed income securities.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Loan investments risk: In addition to those risks typically associated with investments in debt securities, investments in bank loans are subject to the risk that the

collateral securing a loan may not provide sufficient protection to the fund. With respect to participations in loans, the fund's contractual relationship is typically with the lender (rather than the borrower). Consequently, the fund may have limited rights of enforcement against the borrower and assumes the credit risk of both the lender and the borrower. The market for bank loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods that may be longer than seven days. Investments in bank loans may be relatively illiquid, which could adversely affect the value of these investments and the fund's ability to dispose of them.

Valuation risk: During periods of reduced market liquidity or in the absence of readily available market quotations for investments, the ability of the fund to value the fund's investments becomes more difficult and the judgment of the fund's manager and subadvisor(s) may play a greater role in the valuation of the investments due to reduced availability of reliable objective pricing data.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk: Certain of the fund's investments may present liquidity risk. Liquidity risk involves the risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. In recent years, the number and capacity of dealers that make markets in fixed income securities has decreased. Consequently, the decline in dealers engaging in market making trading activities may increase liquidity risk, which can be more pronounced in periods of market turmoil. Liquidity risk may be magnified in a rising interest rate environment or when investor redemptions from fixed income

funds may be higher than normal, causing increased supply in the market due to selling activity. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Derivatives risk: The value of derivatives—so called because their value derives from the value of an under-lying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the fund to lose more than the amount it invested in the derivative. When using derivatives for hedging purposes, the fund's overall returns may be reduced if the hedged investment experiences a favorable price movement. In addition, if the fund has insufficient cash to meet daily variation margin or payment requirements, it may have to sell securities from its portfolio at a time when it may be disadvantageous to do so. The risks of investing in derivative instruments also include market, leverage, operational, legal, and management risks. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of derivatives may be subject to liquidity risk, counterparty risk, credit risk and mispricing or valuation complexity. Derivatives also involve the risk that changes in the value of a derivative may not correlate as anticipated with the underlying asset, rate, index or overall securities markets, thereby reducing their effectiveness. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments. Regulation relating to a mutual fund's use of derivatives and related instruments, including Rule 18f-4 under the Investment Company Act of 1940, as amended, could potentially limit or impact the fund's ability to invest in derivatives, limit the fund's ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the fund's performance.

Investment company risk: Investments in open- or closed-end investment companies, including ETFs, involve certain risks. The shares of other investment companies are subject to the management fees and other expenses of those companies, and the purchase of shares of some investment companies requires the payment of sales loads and (in the case of closed-end investment companies) sometimes substantial premiums above the value of such companies' portfolio securities.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that another subadvisor was responsible for managing the fund's assets during previous periods. Nomura Corporate Research and Asset Management Inc. ("NCRAM") assumed day-to-day management of the fund's assets on or around July 1, 2015. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE High Yield Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: 5.83%
Best quarter during calendar years shown—2Q 2020: 11.76%
Worst quarter during calendar years shown—1Q 2020: (15.35)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (5/1/06) Return before taxes					(14.80	)%			0.53	%			2.76	%
Return after taxes on distributions					(16.62	)			(1.69	)			0.39
Return after taxes on distributions and sale of fund shares					(8.75	)			(0.49	)			1.08
Class Y (12/26/08) Return before taxes					(11.30	)			1.49				3.37
ICE BofA Global High Yield Index (Hedged in USD) (Index reflects no deduction for fees, expenses or taxes.)					(11.30	)			1.83				3.99

Investment manager and advisor(s)

UBS AM serves as the fund's manager. NCRAM serves as the fund's subadvisor. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement. NCRAM uses "associated persons" employed by an affiliate of NCRAM, Nomura Asset Management U.K. Limited, in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. David Kelly, Executive Director and Portfolio Manager and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since May 2021. Eileen Wong, Director and Portfolio Manager, has been a portfolio manager of the fund since May 2023.

•  NCRAM—David Crall, CFA, President, Chief Executive Officer, Chief Investment Officer and Managing Director, and Stephen Kotsen, CFA, a Managing

Director and Lead Portfolio Manager, have been portfolio managers of the fund since 2015. Eric Torres, Executive Director and Portfolio Manager, has been a portfolio manager of the fund since 2016. Derek Leung, Executive Director and Portfolio Manager, has been a portfolio manager of the fund since June 2023.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Large Co Value Equity Investments
Fund summary

Investment objective

Capital appreciation and dividend income.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $50,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					5.50	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.66	%			0.66	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.22				0.21
Total annual fund operating expenses					1.13				0.87

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	659			$	889			$	1,138			$	1,849
Class Y					89				278				482				1,073

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 42% of the average value of its portfolio.

Principal strategies
Principal investments

The fund invests primarily in stocks of US companies that are believed to be undervalued. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in equity securities issued by large capitalization companies. Large capitalization companies means companies with a total market capitalization within the market capitalization range of the companies

acteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The main strategies of the subadvisors include:

•  A "select equity income" strategy in which the subadvisor invests in quality large cap dividend-paying companies, with an emphasis on companies with solid balance sheets and below-market valuations.

•  A "select equity" strategy in which the subadvisor employs a fundamental investment process to construct a focused portfolio of securities of undervalued US companies across a broad capitalization range.

•  A "diversified value" strategy in which the subadvisor seeks to invest in equity securities of large capitalization companies that it considers to be undervalued.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. The fund could lose all of its investment in a company's stock.

Sector risk: Because the fund may invest a significant portion of its assets in the stocks of companies in particular economic sectors, economic changes adversely affecting such a sector may have more of an impact on the fund's performance than another fund having a broader range of investments.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or

unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives and other types of transactions used for investment (non-hedging) purposes (as applicable), may cause the fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the fund that exceed the amount originally invested.

Initial public offerings risk: The purchase of shares issued in IPOs may expose the fund to the risks associated with issuers that have no operating history as public companies, as well as to the risks associated with the sectors of the market in which the issuer operates. The market for IPO shares may be volatile, and share prices of newly-public companies may fluctuate significantly over a short period of time.

Limited capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the fund's ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources.

Model and data risk: A subadvisor for the fund may employ a complex strategy using proprietary quantitative models in selecting investments for the fund. Investments selected using these models may perform differently than expected as a result of the factors used in the models, the weight placed on each factor, changes from the factors' historical trends, and technical issues in the construction and implementation of the models (including, for example, data problems, problems with data supplied by third parties, software issues, or other types of errors). There is no guarantee that a subadvisor's quantitative models will perform as expected or result in effective investment decisions for the fund.

Risk associated with value investing: Securities selection based on value orientation involves certain risks. Because the prices of value-oriented stocks tend to correlate more closely with economic cycles than growth-oriented stocks, value-oriented stocks generally may be more sensitive to changing economic condi-

tions, such as changes in interest rates, corporate earnings and industrial production.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Multi-manager risk: The investment styles and strategies of the fund's subadvisors may not complement each other as expected by the fund's manager. The same security may be held by different subadvisors, or may be acquired by one subadvisor while another subadvisor of the fund decides to sell the same security. Subadvisors may have different views on the market causing them to make different investment decisions. For example, a subadvisor may determine that it is appropriate to take a temporary defensive position in short-term cash instruments at a time when another subadvisor deems it appropriate to maintain or increase market exposure. Because each subadvisor independently places trades for the fund, the fund may incur higher brokerage costs than would be the case if the fund only had one subadvisor. In addition, UBS AM may be subject to potential conflicts of interests in allocating fund assets because it pays different fees to the subadvisors which could impact its revenues.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower.

The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that other subadvisors were responsible for managing portions of the fund's assets during previous periods. Wellington Management Company LLP ("Wellington") assumed day-to-day management of a separate portion of the fund's assets on November 13, 2020. Artisan Partners Limited Partnership ("Artisan Partners") assumed day-to-day management of a separate portion of the fund's assets on May 10, 2021. Hotchkis and Wiley Capital Management, LLC ("Hotchkis & Wiley"), assumed day-to-day management of the fund's assets on April 14, 2023. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Large Co Value Equity Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: 5.26%
Best quarter during calendar years shown—4Q 2020: 19.36%
Worst quarter during calendar years shown—1Q 2020: (32.07)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (11/27/00) Return before taxes					(10.45	)%			3.71	%			8.67	%
Return after taxes on distributions					(13.61	)			1.24				6.36
Return after taxes on distributions and sale of fund shares					(4.04	)			2.65				6.66
Class Y (1/19/01) Return before taxes					(5.00	)			5.15				9.55
Russell 1000 Value Index (Index reflects no deduction for fees, expenses or taxes.)					(7.54	)			6.67				10.29

Investment manager and advisor(s)

UBS AM serves as the fund's manager. Wellington, Artisan Partners and Hotchkis & Wiley serve as the fund's subadvisors. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager, and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respec-

tively. Mayoor Joshi, Executive Director and Portfolio Manager, has been a portfolio manager of the fund since 2019. Edward Eccles, Executive Director and Portfolio Manager, and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 2021. Sofia Westerlund, Director and Portfolio Manager, and Shu-Han Hsu, Director and Portfolio Manager, have been portfolio managers of the fund since 2022.

•  Wellington—Matthew C. Hand, CFA, Senior Managing Director, Partner and Equity Portfolio Manager, has been a portfolio manager of the fund since 2020.

•  Artisan Partners—Daniel J. O'Keefe, Managing Director and Lead Portfolio Manager, and Michael J. McKinnon, Managing Director and Portfolio Manager, have been portfolio managers of the fund since 2021.

•  Hotchkis & Wiley—George H. Davis, Jr., Executive Chairman and Portfolio Manager, Scott McBride, CFA, Chief Executive Officer and Portfolio Manager, and Judd Peters, CFA, Portfolio Manager, have been portfolio managers of the fund since April 2023.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Large Co Growth Equity Investments
Fund summary

Investment objective

Capital appreciation.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $50,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					5.50	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.69	%			0.69	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)2​					0.21				0.19
Total annual fund operating expenses					1.15				0.88
Management fee waiver/expense reimbursements3​					0.02				0.00
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					1.13				0.88

¹​  Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% contingent deferred sales charge ("CDSC") if sold within one year of the purchase date.

²​  "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the fund.

³​  The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses of each class through November 30, 2024 (excluding, as applicable, (i) dividend expense, borrowing costs, and interest expense relating to short sales, and (ii) expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions, expenses related to shareholders' meetings, and extraordinary expenses) would not exceed 1.13% for Class A and 0.88% for Class Y. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed these expense caps and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.*

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 year				3 years				5 years				10 years
Class A				$	659			$	893			$	1,146			$	1,869
Class Y					90				281				488				1,084

*  Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.

Portfolio turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 67% of the average value of its portfolio.

Principal strategies
Principal investments

The fund invests primarily in stocks of companies that are believed to have substantial potential for capital growth. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of any borrowing for investment purposes) in equity securities issued by large capitalization companies. Large capitalization companies means companies with a total market capitalization within the market capitalization range of the companies in the Russell 1000^®​ Growth Index at the time of purchase. Dividend income is an incidental consideration in the investment advisors' selection of stocks for the fund.

The fund may from time to time invest a significant portion of its assets in the stocks of companies in various economic sectors, such as technology. The fund may also invest, to a lesser extent, in other securities such as securities convertible into stocks, fixed income securities, initial public offerings ("IPOs") and stocks of companies with smaller total market capitalizations (i.e., capitalizations below the lower end of the market capitalization range of the companies in the Russell 1000^®​ Growth Index at the time of purchase). The fund may invest up to 20% of its total assets in non-US securities, which may trade either within or outside the US. Non-US securities that trade within the US may include American Depositary Receipts and stocks of non-US issuers listed on US exchanges.

Management process

The fund employs a "manager of managers" structure. UBS Asset Management (Americas) Inc. ("UBS AM"), the fund's manager and primary provider of investment advisory services, has the ultimate authority, subject to oversight by the fund's board, to oversee the fund's subadvisor(s) and recommend their hiring, termination and replacement, and to allocate assets among the fund's subadvisor(s). The relative value of each subadvisor's share of the fund's assets may change over time.

UBS AM's investment process begins with subadvisor selection. UBS AM's portfolio management team constructs a list of potential subadvisors based on information primarily from internal sources and the team's

collective knowledge of the industry, but also supplemented by external sources. The team then focuses its research on that list to identify a small number of the most attractive candidates. This research includes analyzing the portfolio holdings and/or positioning of a subadvisor's investment strategy to understand whether the allocation of risk and the drivers of alpha are consistent with the subadvisor's investment philosophy and stated strengths. The most attractive sub-set of those subadvisors is then selected for in-depth, on-site due diligence meetings with representatives from the investment, operations and compliance groups within UBS AM. The due diligence information is then synthesized to select the most attractive candidate(s) for the fund, subject to the board's approval.

In managing the fund and overseeing the fund's subadvisor(s), UBS AM views its research process as an ongoing one, as the team continually seeks to confirm a subadvisor's investment thesis over the appropriate investment horizon. In general, UBS AM leverages its research and market knowledge to construct funds with exposure to various subadvisors that are expected, in combination, to produce the desired overall fund characteristics. UBS AM's ongoing monitoring and risk management process incorporates daily, weekly, monthly, quarterly and annual responsibilities designed to monitor the drivers of fund risk and performance at the subadvisor level and at the overall fund level. Through this process, UBS AM may adjust a fund's positioning by altering its allocation weights across subadvisors within the fund and/or by changing the specific subadvisors within the fund.

The main strategies of the subadvisors include:

•  A strategy in which the subadvisor employs a concentrated, fundamentally driven sustainable growth strategy.

•  A strategy in which the subadvisor pursues a "growth style" of investing and seeks to capture market inefficiencies and invest in companies that it believes are reasonably priced and have strong fundamental business characteristics and sustainable and durable earnings growth.

•  A strategy in which the subadvisor invests in a focused portfolio of common stocks of large capitalization companies that it believes have a sustainable competitive advantage.

Principal risks

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the fund. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks presented by an investment in the fund are:

Equity risk: Stocks and other equity securities, and securities convertible into stocks, generally fluctuate in value more than bonds. The fund could lose all of its investment in a company's stock.

Sector risk: Because the fund may invest a significant portion of its assets in the stocks of companies in particular economic sectors, economic changes adversely affecting such a sector may have more of an impact on the fund's performance than another fund having a broader range of investments.

Foreign investing risk: The value of the fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers.

Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Liquidity risk. Certain of the fund's investments may present liquidity risk. Liquidity risk involves the risk that investments cannot be readily sold at the desired time or price, and the fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the fund's value or prevent the fund from taking advantage of other investment opportunities. Liquid portfolio investments may become illiquid or less liquid after purchase by the fund due to low trading volume, adverse investor perceptions and/or other market developments. Liquidity risk includes the risk that the fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.

Initial public offerings risk: The purchase of shares issued in IPOs may expose the fund to the risks associated with issuers that have no operating history as public companies, as well as to the risks associated with the sectors of the market in which the issuer operates. The market for IPO shares may be volatile, and share prices of newly-public companies may fluctuate significantly over a short period of time.

Limited capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the fund's ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources.

Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the fund may have to reinvest these repayments at lower interest rates. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve.

Credit risk: The risk that the fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract or transaction, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM and/or a subadvisor may not produce the desired results.

Multi-manager risk: The investment styles and strategies of the fund's subadvisors may not complement each other as expected by the fund's manager. The same security may be held by different subadvisors, or may be acquired by one subadvisor while another subadvisor of the fund decides to sell the same security. Subadvisors may have different views on the market causing them to make different investment decisions. For example, a subadvisor may determine that it is appropriate to take a temporary defensive position in short-term cash instruments at a time when another subadvisor deems it appropriate to maintain or increase market exposure. Because each subadvisor independently places trades for the fund, the fund may incur higher brokerage costs than would be the case if the fund only had one subadvisor. In addition, UBS AM may be subject to potential conflicts of interests in allocating fund assets because it pays different fees to the subadvisors which could impact its revenues.

Performance

Risk/return bar chart and table

The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect the sales charges of the fund's Class A shares; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year and by showing how the fund's average annual total returns compare with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. This may be particularly true given that other subadvisors were responsible for managing portions of the fund's assets during previous periods. J.P. Morgan Investment Management, Inc. ("J.P. Morgan") assumed day-to-day management of a separate portion of the fund's assets on October 5, 2012. GQG Partners LLC ("GQG") assumed day-to-day management of a separate portion of the fund's assets on December 15, 2021. Polen Capital Management, LLC ("Polen") assumed day-to-day management of a separate portion of the fund's assets on December 15, 2021. Updated performance for the fund is available at www.ubs.com/us/en/assetmanagement/funds/mutual-fund-performance.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class A shares' after-tax returns shown.

PACE Large Co Growth Equity Investments
Annual Total Returns of Class A Shares

Total return January 1 - September 30, 2023: 18.88%
Best quarter during calendar years shown—2Q 2020: 28.72%
Worst quarter during calendar years shown—2Q 2022: (19.16)%

Average annual total returns (figures reflect sales charges)
(for the periods ended December 31, 2022)

Class (inception date)				1 year				5 years				10 years
Class A (11/27/00) Return before taxes					(31.95	)%			7.64	%			11.47	%
Return after taxes on distributions					(38.52	)			1.85				7.17
Return after taxes on distributions and sale of fund shares					(14.17	)			5.91				8.96
Class Y (2/15/01) Return before taxes					(27.77	)			9.15				12.40
Russell 1000 Growth Index (Index reflects no deduction for fees, expenses or taxes.)					(29.14	)			10.96				14.10

Investment manager and advisor(s)

UBS AM serves as the fund's manager. J.P. Morgan, GQG and Polen serve as the fund's subadvisors. UBS AM uses "associated persons" employed by an affiliate of UBS AM, UBS AM (UK), in its provision of investment advisory services to the fund under a "participating affiliate" arrangement.

Portfolio management team

•  UBS AM—Mabel Lung, CFA, Managing Director and Portfolio Manager, and Fred Lee, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 1995 and 2009, respectively. Mayoor Joshi, Executive Director and Portfolio Manager, has been a portfolio manager of the fund since 2019. Edward Eccles, Executive Director and Portfolio Manager, and Christopher Andersen, CFA, Executive Director and Portfolio Manager, have been portfolio managers of the fund since 2021. Sofia Westerlund, Director and Portfolio Manager, and Shu-Han Hsu, Director and Portfolio Manager, have been portfolio managers of the fund since 2022.

•  J.P. Morgan—Giri Devulapally, Managing Director, and Joseph Wilson, Managing Director, have been portfolio managers of the fund since 2017 and 2016, respectively. Larry H. Lee, Managing Director, and Holly Fleiss, Managing Director, have been portfolio managers of the fund since 2020. Robert Maloney, Executive Director, has been a portfolio manager of the fund since 2022.

•  GQG—Rajiv Jain, Chairman and Chief Investment Officer, has been a portfolio manager of the fund since 2021. Brian Kersmanc, Senior Investment Analyst and Portfolio Manager, and Sudarshan Murthy, CFA, Senior Investment Analyst and Portfolio Manager, have been portfolio managers of the fund since 2022.

•  Polen—Dan Davidowitz, Portfolio Manager and Analyst, and Brandon Ladoff, Portfolio Manager and Director of Sustainable Investing, have been portfolio managers of the fund since December 2021.

Purchase & sale of fund shares

You may purchase, redeem or exchange shares of the fund on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange shares of the fund either through a financial advisor or directly from the fund. In general, the minimum initial investment is $1,000 and the minimum subsequent investment is $100. Class Y shares are available only to certain types of investors, as described in this prospectus under "Managing your fund account—Class Y shares."

Tax information

The dividends and distributions you receive from the fund are taxable and will generally be taxed as ordinary income, capital gains or some combination of both, unless you hold shares through a tax-exempt account or

plan, such as an individual retirement account or 401(k) plan, in which case dividends and distributions on your shares generally will be taxed when withdrawn from the tax-exempt account or plan.

Payments to broker-dealers and other financial intermediaries

If you purchase the fund through a broker-dealer or other financial intermediary (such as a bank), the fund, UBS AM and/or its affiliates may pay the intermediary for the sale of fund shares and related services, or other shareholder services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your financial advisor to recommend the fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

PACE Small/Medium Co Value Equity Investments
Fund summary

Investment objective

Capital appreciation.

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may qualify for sales charge discounts on purchases of Class A shares if you or your family invest, or agree to invest in the future, at least $50,000 in the UBS family of funds. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 134 of the prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 245 of the fund's Statement of Additional Information. Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A beginning on page A-1 of this prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).

Shareholder fees (fees paid directly from your investment)

				Class A				Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price)					5.50	%			None
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price)					None1​				None
Exchange fee					None				None

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

				Class A				Class Y
Management fees					0.70	%			0.70	%
Distribution and/or service (12b-1) fees					0.25				None
Other expenses (includes administration fee of 0.10%)					0.30				0.35
Acquired fund fees and expenses2​					0.01				0.01
Total annual fund operating expenses					1.26				1.06
Management fee waiver/expense reimbursements3​					0.00				0.01
Total annual fund operating expenses after fee waiver and/or expense reimbursements3​					1.26				1.05