Natixis Gateway Quality Income ETF

Investment Goal

The Fund seeks to deliver current income while maintaining prospects for capital appreciation.

Fund Fees & Expenses

The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table. If such expenses were reflected, the expenses set forth below would be higher.

Annual Fund Operating Expenses


(expenses that you pay each year as a percentage of the value of your investment)
Management fees	0.24%
Distribution and/or service (12b-1) fees	0.00%
Other expenses¹	2.84%
Total annual fund operating expenses	3.08%
Fee waiver and/or expense reimbursement²	2.74%
Total annual fund operating expenses after fee waiver and/or expense reimbursement	0.34%

1	Other expenses are estimated for the current fiscal year.

Natixis Advisors, LLC (“Natixis Advisors” or the “Adviser”) has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.34% of the Fund’s average daily net assets, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, and organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through April 30, 2026, and may be terminated before then only with the consent of the Fund’s Board of Trustees. The Adviser will be permitted to recover management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below both (1) the expense limitation ratio in place at the time such amounts were waived/reimbursed and (2) the Fund’s current applicable expense limitation ratio. The Fund will not be obligated to repay any such waived and/or reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated (whether or not shares are redeemed), and also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the example is based on the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement assuming that such waiver and/or reimbursement will only be in place through the date noted above and on the Total Annual Fund Operating Expenses for the remaining periods. The example does not take into account brokerage commissions and other fees to financial intermediaries that you may pay on your purchases and sales of shares of the Fund. It also does not include the transaction fees on purchases and redemptions of creation units (“Creation Units”), because those fees will not be imposed on retail investors. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


If shares are redeemed:	1 year		3 years
	$	35	$	297

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 for you if your 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. Because the fund has not commenced operations as of the date of this prospectus, there is no portfolio turnover to report.

Investments, Risks and Performance

Principal Investment Strategies

The Fund is an actively-managed exchange-traded fund (“ETF”) that seeks to achieve its investment objective by investing in high-quality stocks and written index call option exposure. The Fund may use listed index options or equity-linked notes to achieve the written index call option exposure.

Equity Portfolio

Under normal circumstances, the Fund invests in a diversified portfolio of U.S. large- and mid-capitalization stocks with quality characteristics identified through certain fundamental metrics determined by Gateway Investment Advisers, LLC (the “Subadviser”). Generally, the Subadviser believes that a high-quality company is a company that has an established business with high relative profitability characteristics and low leverage. For these purposes, large-capitalization companies are those that, at the time of purchase, generally have market capitalizations of at least $10 billion and mid-capitalization companies are those that, at the time of purchase, generally have market capitalizations of between $2 billion and $10 billion.

The Subadviser uses a multifactor quantitative model to construct and manage the stock portfolio. The model evaluates U.S.-exchange-traded equities that meet criteria and constraints established by the Subadviser. A quality score is assigned to each security in the investment universe based on systematic factors including profitability and leverage. The strategy seeks to maximize exposure to the weighted quality score, while considering active exposures to individual names, sectors, and the market as a whole. The equity portfolio generally consists of approximately 75-150 securities. Equity securities purchased by the Fund may include U.S. exchange-listed common stocks, preferred stocks, American Depository Receipts and investment companies (including ETFs). The holdings may be rebalanced as frequently as desired by the Subadviser to maintain the overall desired exposure to the quality factor.

Equity-linked notes (“ELNs”)

In order to generate income, the Fund may invest in ELNs. ELNs are investment products that are structured as notes. They are issued by financial institutions such as banks and broker-dealers or entities organized by financial institutions to issue the ELNs. An ELN is designed to offer a return linked to specific economic characteristics identified in the note. The Fund will generally invest in ELNs that are issued in a privately negotiated transaction, including securities offered and sold under Rule 144A of the Securities Act of 1933 (the “Securities Act”).

The ELNs in which the Fund invests are derivative instruments. They are designed to replicate a covered call writing strategy by combining into a single note the economic characteristics of (i) an investment in a broad market index and (ii) index covered call writing (“Underlying Characteristics”). The ELNs are expected to provide recurring cash flow to the Fund through this replication. They are expected to be an important source of the Fund’s return.

Investing in ELNs may reduce the Fund’s volatility. On one hand, the income from the ELNs would reduce potential losses incurred by the Fund’s equity portfolio. However, by replicating a covered call strategy in each ELN, the ELNs may also reduce the Fund’s ability to fully profit from potential increases in the value of its equity portfolio.

Generally, when purchasing an ELN, the Fund pays the counterparty an amount based on the Underlying Characteristics plus the cost to structure the ELN. Upon maturity of the ELN, the Fund generally receives the par value of the ELN, plus interest, plus or minus a return based on the return of the Underlying Characteristics. However, each ELN will be structured so that it cannot lose more than the principal that the Fund paid when purchasing the ELN.

Other Investments

The Fund may invest in convertible securities, partnerships, when issued/delayed delivery securities and initial public offerings (“IPOs”). The Fund may also hold cash and cash equivalents.

Principal Investment Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Fund shares are not bank deposits and are not guaranteed, endorsed or insured by the Federal Deposit Insurance Corporation or any other government agency, and are subject to investment risks, including possible loss of the principal invested.

The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund’s portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.

Market/Issuer Risk: The market value of the Fund’s investments will move up and down, sometimes rapidly and unpredictably, based upon overall market and economic conditions, as well as a number of reasons that directly relate to the issuers of the Fund’s investments, such as management performance, financial condition and demand for the issuers’ goods and services. The Adviser will attempt to reduce this risk by implementing various volatility management strategies and techniques. However, there is no guarantee that such strategies and techniques will produce the intended result.

Equity Securities Risk: The value of the Fund’s investments in equity securities could be subject to unpredictable declines in the value of individual securities and periods of below-average performance in individual securities or in the equity market as a whole. Securities issued in IPOs tend to involve greater market risk than other equity securities due, in part, to public perception and the lack of publicly available information and trading history. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Credit/Counterparty Risk: Credit/counterparty risk is the risk that the issuer or guarantor of a fixed-income security, or the counterparty to a derivative or other transaction, will be unable or unwilling to make timely payments of interest or principal or to otherwise honor its obligations. As a result, the Fund may sustain losses or be unable or delayed in its ability to realize gains. The Fund will be subject to credit/counterparty risk with respect to its investments in ELNs as well as the counterparties to its derivatives transactions. This risk will be heightened to the extent the Fund enters into derivative transactions with a single counterparty (or affiliated counterparties that are part of the same organization), causing the Fund to have significant exposure to such counterparty. Many of the protections afforded to participants on organized exchanges and clearing houses, such as the performance guarantee given by a central clearing house, are not available in connection with over-the-counter (“OTC”) derivatives transactions. For centrally cleared derivatives, including many options, the primary credit/counterparty risk is the creditworthiness of the Fund’s clearing broker and the central clearing house itself.

Equity-Linked Notes Risk: When the Fund invests in ELNs, it receives cash but limits its opportunity to profit from an increase in the market value of the instrument because of the limits relating to the written index call options exposure replicated within the particular ELN. Investing in ELNs may be more costly to the Fund than if the Fund had invested in the underlying instruments directly. Investments in ELNs often have risks similar to the underlying instruments being replicated, which include market risk. ELNs are derivatives and therefore are subject to derivatives risk. In addition, since ELNs are in note form, ELNs are subject to certain debt securities risks, such as credit and counterparty risk. Should the prices of the underlying instruments move in an unexpected manner, the Fund may not achieve the anticipated benefits of an investment in an ELN, and may realize losses, which could be significant and could include the Fund’s entire principal investment in such ELN. Investments in ELNs are also subject to liquidity risk, which may make ELNs difficult to sell and value. A lack of liquidity may also cause the value of the ELN to decline. In addition, ELNs may exhibit price behavior that does not correlate with the underlying securities being replicated. The Fund’s ELN investments are subject to the risk that issuers and/or counterparties will fail to make payments when due or default completely, which could result in a loss of all or part of the Fund’s investment. Prices of the Fund’s ELN investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. As with all investments, successful use of ELNs depends in significant part on the accuracy of the Subadviser’s analysis of the issuer’s creditworthiness and financial prospects, and of the Subadviser’s forecast as to changes in relevant economic and financial market conditions and factors.

Options Risk: The Fund may invest in ELNs that incorporate the characteristics of index call options. The value of the ELNs, and therefore the Fund’s, replication of the characteristics of index options will fluctuate in response to changes in the value of the underlying securities. Writing index call options limits the opportunity to profit from an increase in the market value of stocks in exchange for up-front cash at the time of selling the index call option. The Fund may replicate purchasing index call options through its use of ELNs. If it does so, it also risks losing all or part of the cash paid. Unusual market conditions or the lack of a ready market for any particular option at a specific time may reduce the effectiveness of the Fund’s option strategies, and for these and other reasons the Fund’s option strategies may not reduce the Fund’s volatility to the extent desired.

Authorized Participant Concentration Risk: Only an authorized participant (“Authorized Participant”) may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that act as Authorized Participants, none of which are or will be obligated to engage in creation or redemption transactions. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, the Fund’s shares may trade at a discount to net asset value (“NAV”) and possibly face trading halts and/or delisting.

Cybersecurity and Technology Risk: The Fund, its service providers, market makers, listing exchange, Authorized Participants and other market participants increasingly depend on complex information technology and communications systems, which are subject to a number of different threats and risks that could adversely affect the Fund and its shareholders. Cybersecurity and other operational and technology issues may result in financial losses to the Fund and its shareholders.

Derivatives Risk: Derivative instruments (such as those in which the Fund may invest, including ELNs) are subject to changes in the value of the underlying assets or indices on which such instruments are based. There is no guarantee that the use of derivatives will be effective or that suitable transactions will be available. Even a small investment in derivatives may give rise to leverage risk and can have a significant impact on the Fund’s exposure to securities market values, interest rates or currency exchange rates. It is possible that the Fund’s liquid assets may be insufficient to support its obligations under its derivatives positions. The use of derivatives for other than hedging purposes may be considered a speculative activity, and involves greater risks than are involved in hedging. The use of derivatives may cause the Fund to incur losses greater than those that would have occurred had derivatives not been used. The Fund’s use of derivatives involves other risks, such as credit/counterparty risk relating to the other party to a derivative contract, the risk of difficulties in pricing and valuation, the risk that changes in the value of a derivative may not correlate as expected with changes in the value of relevant assets, rates or indices, liquidity risk, allocation risk and the risk of losing more than any amounts paid or margin transferred to initiate derivatives positions. There is also the risk that the Fund may be unable to terminate or sell a derivative position at an advantageous time or price. The Fund’s derivative counterparties may experience financial difficulties or otherwise be unwilling or unable to honor their obligations, possibly resulting in losses to the Fund.

Index Call Option Risk: As the seller of the index call option, the Fund may write index call options, typically on broad-based securities market indices, with an aggregate notional value less than the market value of its broadly diversified stock portfolio. As the seller of the index call option, the Fund receives cash (the “premium”) from the purchaser. The premium, the exercise price and the value of the index determine the gain or loss realized by the Fund as the seller of the index call option. The Fund can also repurchase the call option prior to the expiration date, ending its obligation. In such a case, the difference between the cost of repurchasing the option and the premium received will determine the gain or loss realized by the Fund.

Investments in Other Investment Companies Risk: The Fund will indirectly bear the management, service and other fees of any other investment companies, including exchange-traded funds, in which it invests in addition to its own expenses.

Large-Capitalization Companies Risk: The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. The Fund’s performance may be adversely affected if securities of large-capitalization companies outperform the market as a whole because although the Fund owns large-capitalization equities through its Equity Portfolio, the Fund also invests in ELNs with short call option spreads on large-capitalization equities (e.g., the S&P 500). Because ELNs generate income from premiums on options sold and are subject to limited upside appreciation given their use of short call option spreads on large-capitalization equities, the outperformance of, or volatility related to, large-capitalization companies may adversely impact the ELN’s performance, which in turn may adversely impact Fund performance.

Leverage Risk: Leverage is the risk associated with securities or investment practices (e.g., borrowing and the use of certain derivatives) that multiply small index, market or asset-price movements into larger changes in value. The use of leverage increases the impact of gains and losses on the Fund’s returns, and may lead to significant losses if investments are not successful.

Liquidity Risk: Liquidity risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Decreases in the number of financial institutions willing to make markets in the Fund’s investments or in their capacity or willingness to transact may increase the Fund’s exposure to this risk. Events that may lead to increased redemptions, such as market disruptions or increases in interest rates, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. During times of market turmoil, there may be no buyers or sellers for securities in certain asset classes. Securities acquired in a private placement, such as Rule 144A securities, are generally subject to significant liquidity risk because they are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. In other circumstances, liquid investments may become illiquid. Liquidity issues may also make it difficult to value the Fund’s investments. The Fund may invest in liquid investments that become illiquid due to financial distress, or geopolitical events such as sanctions, trading halts or wars.

Management Risk: A strategy used by the Fund’s portfolio managers may fail to produce the intended result.

Mid-Capitalization Companies Risk: Compared to large-capitalization companies, mid-capitalization companies are more likely to have limited product lines, markets or financial resources. Stocks of these companies often trade less frequently and in limited volume and their prices may fluctuate more than stocks of large-capitalization companies. As a result, it may be relatively more difficult for the Fund to buy and sell securities of mid-capitalization companies.

Models and Data Risk: The Subadviser utilizes various proprietary quantitative models to identify investment opportunities. There is a possibility that one or all of the quantitative models may fail to identify profitable opportunities at any time. Furthermore, the models may incorrectly identify opportunities and these misidentified opportunities may lead to substantial losses for the Fund. Models may be predictive in nature and such models may result in an incorrect assessment of future events. Data used in the construction of models may prove to be inaccurate or stale, which may result in losses for the Fund.

New and Smaller Sized Fund Risk: The Fund is relatively new and has a limited operating history for investors to evaluate and may not be successful in implementing its investment strategies. The Fund may fail to attract sufficient assets to achieve or maintain economies of scale, which could result in the Fund being liquidated at any time without shareholder approval and at a time that may not be favorable for all shareholders. Smaller ETFs will have a lower public float and lower trading volumes, leading to wider bid/ask spreads.

Operational Risk: The Fund is exposed to operational risk arising from a number of factors, including but not limited to human error, processing and communication errors, errors of the Fund’s service providers, market makers, listing exchange, Authorized Participants or the issuers of securities in which the Fund invests or with which they do business, failed or inadequate processes and technology or systems failures.

Premium/Discount Risk: Shares of the Fund are listed for trading on the NYSE Arca, Inc. (the “NYSE Arca”) and are bought and sold in the secondary market at market prices that may differ from their most recent NAV. The market value of the Fund’s shares will fluctuate, in some cases materially, in response to changes in the Fund’s NAV, the intraday value of the Fund’s holdings, and the relative supply and demand for the Fund’s shares on the exchange. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for shares may result in shares trading at a significant premium or discount to NAV and/or in a reduced liquidity of your investment. During such periods, you may be unable to sell your shares or may incur significant losses if you sell your shares. There are various methods by which investors can purchase and sell shares and various types of orders that may be placed. Investors should consult their financial intermediary before purchasing or selling shares of the Fund. If a shareholder purchases shares at a time when the market price is at a premium to the NAV or sells shares at a time when the market price is at a discount to the NAV, the shareholder may sustain losses.

Secondary Market Trading Risk: Investors buying or selling shares of the Fund in the secondary market will pay brokerage commissions or other charges imposed by broker-dealers as determined by that broker. Brokerage commissions are often a fixed amount and may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of shares.

Trading Issues Risk: Trading in Fund shares on the NYSE Arca may be halted in certain circumstances. There can be no assurance that the requirements of the NYSE Arca necessary to maintain the listing of the Fund will continue to be met.

Valuation Risk: This is the risk that the Fund has valued certain securities or positions at a higher price than the price at which they can be sold. This risk may be especially pronounced for investments, such as derivatives, that may be illiquid or may become illiquid.

Risk/Return Bar Chart and Table

Because the Fund has not yet completed a full calendar year, information related to Fund performance, including a bar chart showing annual returns, has not been included in this Prospectus. The performance information provided by the Fund in the future will give 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 returns compare to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at im.natixis.com and/or by calling the Fund toll-free at 800-458-7452.

Management

Investment Adviser

Natixis Advisors

Subadviser

Gateway Investment Advisers, LLC (“Gateway”)

Portfolio Managers

Daniel M. Ashcraft, CFA^®, Vice President and Portfolio Manager of Gateway, has served as co-portfolio manager of the Fund since 2023.

Michael T. Buckius, CFA^®, President, Chief Executive Officer and Chief Investment Officer of Gateway, has served as co-portfolio manager of the Fund since 2023.

Kenneth H. Toft, CFA^®, Senior Vice President and Portfolio Manager of Gateway, has served as co-portfolio manager of the Fund since 2023.

Mitchell J. Trotta, CFA^®, Portfolio Manager of Gateway, has served as co-portfolio manager of the Fund since 2023.

Purchase and Sale of Fund Shares

The Fund will issue and redeem shares at NAV only in large blocks of shares, typically 10,000 shares, called “Creation Units.” Only a few financial institutions that are Authorized Participants are authorized to purchase and redeem Creation Units directly with the Fund. Creation Units are typically issued and redeemed in exchange for cash and/or the deposit or delivery of a basket of securities specified each day by the Fund as the securities in exchange for which the Fund will issue or redeem shares. Except when aggregated in Creation Units, shares are not redeemable securities of the Fund. The number of shares comprising a Creation Unit may change from time to time.

Individual shares of the Fund may only be purchased and sold in secondary market transactions through broker-dealers. Shares of the Fund are listed for trading on the NYSE Arca, and because shares trade at market prices rather than NAV, shares of the Fund may trade at a price greater than NAV (a premium) or less than NAV (a discount).

Tax Information

Fund distributions are generally taxable to you as ordinary income or capital gains, except for distributions to retirement plans and other investors that qualify for tax-advantaged treatment under U.S. federal income tax law generally. Investments in such tax-advantaged plans will generally be taxed only upon withdrawal of monies from the tax-advantaged arrangement.

Payments to Broker-Dealers and Other Financial Intermediaries

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

More About Goals and Strategies

Natixis Gateway Quality Income ETF

Investment Goal

The Fund seeks to deliver current income while maintaining prospects for capital appreciation. The Fund’s investment goal is non-fundamental and may be changed without shareholder approval. The Fund will provide 60 days‘ prior notice to shareholders before changing the investment goal.

Principal Investment Strategies

Equity Portfolio

Equity-linked notes (“ELNs”)

Other Investments

The Fund may invest in convertible securities, partnerships, when issued/delayed delivery securities and initial public offerings (“IPOs”). The Fund may also hold cash and cash equivalents.

More About Risks

This section provides more information on principal risks that may affect the Fund’s portfolio, as well as information on additional risks the Fund may be subject to because of its investments or practices. In seeking to achieve its investment goals, the Fund may also invest in various types of securities and engage in various investment practices which are not a principal focus of the Fund and therefore are not described in this Prospectus. These securities and investment practices and their associated risks are discussed in the Fund’s Statement of Additional Information (“SAI”), which is available without charge upon request (see back cover). You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.

Market/Issuer Risk

The market value of the Fund’s investments will move up and down, sometimes rapidly and unpredictably, based upon political, regulatory, market, economic, and social conditions, as well as developments that impact specific economic sectors, industries, or segments of the market, including conditions that directly relate to the issuers of the Fund’s investments, such as management performance, financial condition and demand for the issuers’ goods and services. The Fund is subject to the risk that geopolitical events will adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on global economies and markets. Likewise, natural and environmental disasters and epidemics or pandemics may be highly disruptive to economies and markets.

Equity Securities Risk

The value of your investment in the Fund is based on the market value (or price) of the securities the Fund holds. You may lose money on your investment due to unpredictable declines in the value of individual securities and/or periods of below-average performance in individual securities, industries or in the equity market as a whole. This may impact the Fund’s performance and may result in higher portfolio turnover, which may increase the tax liability to taxable shareholders and the expenses incurred by the Fund. The market value of a security can change daily due to political, economic and other events that affect the securities markets generally, as well as those that affect particular companies or governments. These price movements, sometimes called volatility, will vary depending on the types of securities the Fund owns and the markets in which they trade. Historically, the equity markets have moved in cycles, and the value of the Fund’s equity securities may fluctuate drastically from day to day. Individual companies may report poor results or be negatively affected by industry and/or economic trends and developments. The prices of securities issued by such companies may suffer a decline in response to such trends and developments. Securities issued in IPOs tend to involve greater market risk than other equity securities due, in part, to public perception and the lack of publicly available information and trading history. Common stocks represent an equity or ownership interest in an issuer. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Credit/Counterparty Risk

Credit/counterparty risk is the risk that the issuer or guarantor of a fixed-income security, or the counterparty to a derivative or other transaction, will be unable or unwilling to make timely payments of interest or principal or to otherwise honor its obligations. As a result, the Fund may sustain losses or be unable or delayed in its ability to realize gains. The Fund will be subject to credit/counterparty risk with respect to its investments in ELNs as well as the counterparties to its derivatives transactions. Many of the protections afforded to participants on organized exchanges, such as the performance guarantee given by a central clearing house, are not available in connection with over-the-counter (“OTC”) derivatives transactions. For centrally cleared derivatives, including many options, the primary credit/counterparty risk is the creditworthiness of the Fund’s clearing broker and the central clearing house itself.

Regulatory requirements may also limit the ability of the Fund to protect its interests in the event of an insolvency of a derivatives counterparty. In the event of a counterparty’s (or its affiliate’s) insolvency, the Fund’s ability to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral, could be stayed or eliminated under special resolution regimes adopted in the United States, the European Union, the United Kingdom, and various other jurisdictions. Such regimes provide government authorities with broad authority to intervene when a financial institution is experiencing financial difficulty. In particular, with respect to counterparties who are subject to such proceedings in the European Union and the United Kingdom, the liabilities of such counterparties to the Fund could be reduced, eliminated, or converted to equity in such counterparties (sometimes referred to as a “bail in”).

Equity-Linked Notes Risk

When the Fund invests in ELNs, it receives cash but limits its opportunity to profit from an increase in the market value of the instrument because of the limits relating to the written index call options exposure replicated within the particular ELN. Investing in ELNs may be more costly to the Fund than if the Fund had invested in the underlying instruments directly. Investments in ELNs often have risks similar to the underlying instruments being replicated, which include market risk. ELNs are derivatives and therefore are subject to derivatives risk. In addition, since ELNs are in note form, ELNs are subject to certain debt securities risks, such as credit and counterparty risk. Should the prices of the underlying instruments move in an unexpected manner, the Fund may not achieve the anticipated benefits of an investment in an ELN, and may realize losses, which could be significant and could include the Fund’s entire principal investment in such ELN. Investments in ELNs are also subject to liquidity risk, which may make ELNs difficult to sell and value. A lack of liquidity may also cause the value of the ELN to decline. In addition, ELNs may exhibit price behavior that does not correlate with the underlying securities being replicated. The Fund’s ELN investments are subject to the risk that issuers and/or counterparties will fail to make payments when due or default completely, which could result in a loss of all or part of the Fund’s investment. Prices of the Fund’s ELN investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. As with all investments, successful use of ELNs depends in significant part on the accuracy of the Subadviser’s analysis of the issuer’s creditworthiness and financial prospects, and of the Subadviser’s forecast as to changes in relevant economic and financial market conditions and factors.

Options Risk

The Fund may invest in ELNs that incorporate the characteristics of index call options. The value of an ELN’s, and therefore the Fund’s, replication of the characteristics of index options may fluctuate in response to changes in the value of the underlying securities. Writing index call options limits the opportunity to profit from an increase in the market value of stocks in exchange for up-front cash at the time of selling the index call option. The Fund may replicate purchasing index call options through its use of ELNs. If it does so, it also risks losing all or part of the cash paid. Unusual market conditions or the lack of a ready market for any particular option at a specific time may reduce the effectiveness of the Fund’s option strategies, and for these and other reasons the Fund’s option strategies may not reduce the Fund’s volatility to the extent desired. From time to time, the Fund may reduce its holdings of call options, resulting in an increased exposure to a market decline.

Authorized Participant Concentration Risk

Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that act as Authorized Participants, none of which are or will be obligated to engage in creation or redemption transactions. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, the Fund’s shares may trade at a discount to NAV and possibly face trading halts and/or delisting.

Cybersecurity and Technology Risk

The Fund, its service providers, market makers, listing exchange, Authorized Participants and other market participants increasingly depend on complex information technology and communications systems, which are subject to a number of different threats and risks that could adversely affect the Fund and its shareholders. These risks include, among others, theft, misuse, and improper release of confidential or highly sensitive information relating to the Fund and its shareholders, as well as compromises or failures to systems, networks, devices and applications relating to the operations of the Fund and its service providers. Power outages, natural disasters, equipment malfunctions and processing errors that threaten these systems, as well as market events that occur at a pace that overloads these systems, may also disrupt business operations or impact critical data. Any problems relating to the performance and effectiveness of security procedures used by the Fund or its service providers to protect the Fund’s assets, such as algorithms, codes, passwords, multiple signature systems, encryption and telephone call-backs, may have an adverse impact on an investment in the Fund. Cybersecurity and other operational and technology issues may result in financial losses to the Fund and its shareholders, impede business transactions, violate privacy and other laws, subject the Fund to certain regulatory penalties and reputational damage, and increase compliance costs and expenses. Furthermore, as the Fund’s assets grow, it may become a more appealing target for cybersecurity threats such as hackers and malware. Although the Fund has developed processes, risk management systems, and business continuity plans designed to reduce these risks, the Fund does not directly control the cybersecurity defenses, operational and technology plans and systems of its service providers, financial intermediaries and companies in which it invests or with which it does business. The Fund and its shareholders could be negatively impacted as a result. Similar types of cybersecurity risks also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund’s investment in such securities to lose value.

Derivatives Risk

As described herein and in the SAI, the use of derivatives involves special risks. Derivatives are financial contracts whose value depends upon or is derived from the value of an underlying asset, reference rate or index. There is no guarantee that the Fund’s use of derivatives will be effective or that suitable transactions will be available. Even a small investment in derivatives may give rise to leverage risk and can have a significant impact on the Fund’s exposure to securities market values, interest rates or currency exchange rates. It is possible that the Fund’s liquid assets may be insufficient to support its obligations under its derivatives positions. The Fund’s use of derivatives, such as ELNs, involves other risks, such as the credit/counterparty risk relating to the other party to a derivative contract, the risk of difficulties in pricing and valuation, the risk that changes in the value of a derivative may not correlate as expected with relevant assets, rates or indices, liquidity risk and the risk of losing more than any amounts paid or margin transferred to initiate derivatives positions. The Fund may be required to sell other securities at inopportune times to meet collateral requirements on its derivative transactions. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. The use of derivatives may cause the Fund to incur losses greater than those which would have occurred had derivatives not been used. Losses resulting from the use of derivatives will reduce the Fund’s NAV, and possibly income. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. When used, derivatives may affect the timing, amount, or character of distributions payable to, and thus taxes payable by, shareholders. Similarly, for accounting and performance reporting purposes, income and gain characteristics may be different than if the Fund held the underlying securities or other assets directly.

Rule 18f-4 under the Investment Company Act of 1940, as amended (the “1940 Act”), governs the use of derivative investments and certain financing transactions by registered investment companies. Among other things, Rule 18f-4 requires funds that invest in derivative instruments beyond a specified limited amount to apply a value-at-risk based limit to their use of certain derivative instruments and financing transactions and to adopt and implement a derivatives risk management program. A fund that uses derivative instruments in a limited amount is not subject to the full requirements of Rule 18f-4. Compliance with Rule 18f-4 by the Fund could, among other things, make derivatives more costly, limit their availability or utility, or otherwise adversely affect their performance.

Index Call Option Risk

The Fund may write (sell) index call options, typically on broad-based securities market indices, with an aggregate notional value less than the market value of its broadly diversified stock portfolio. As the seller of the index call option, the Fund receives cash (the “premium”) from the purchaser. The premium, the

exercise price and the value of the index determine the gain or loss realized by the Fund as the seller of the index call option. The Fund can also repurchase the call option prior to the expiration date, ending its obligation. In such a case, the difference between the cost of repurchasing the option and the premium received will determine the gain or loss realized by the Fund.

Inflation/Deflation Risk

Inflation risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. As inflation increases, the real value of the Fund’s portfolio could decline. Inflation rates may change frequently and drastically as a a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that such policies will change), and the Fund’s investments may not keep pace with inflation, which may result in losses to the Fund’s investors. Recently, inflation rates in the United States and elsewhere have been increasing. There can be no assurance that this trend will not continue or that efforts to slow or reverse inflation will not harm the economy and asset values. This risk is elevated compared to historical market conditions because of recent monetary policy measures and the current interest rate environment. Deflation risk is the risk that prices throughout the economy decline over time (the opposite of inflation). Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.

Investments in Other Investment Companies Risk

The Fund will indirectly bear the management, service and other fees of any other investment companies, including ETFs, in which it invests in addition to its own expenses. In addition, investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs.

Large-Capitalization Companies Risk

The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes. The Fund’s performance may be adversely affected if securities of large-capitalization companies outperform the market as a whole because although the Fund owns large-capitalization equities through its Equity Portfolio, the Fund also invests in ELNs with short call option spreads on large-capitalization equities (e.g., the S&P 500). Because ELNs generate income from premiums on options sold and are subject to limited upside appreciation given their use of short call option spreads on large-capitalization equities, the outperformance of, or volatility related to, large-capitalizattion companies may adversely impact the ELN’s performance, which in turn may adversely impact Fund performance.

Leverage Risk

Leverage is the risk associated with securities or investment practices (e.g., borrowing and the use of certain derivatives) that multiply small index, market or asset-price movements into larger changes in value. Leverage magnifies the potential for gain and the risk of loss. As a result, a relatively small decline in the value of the underlying investments could result in a relatively large loss. The use of leverage will increase the impact of gains and losses on the Fund’s returns, and may lead to significant losses if investments are not successful.

Liquidity Risk

Liquidity risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Decreases in the number of financial institutions willing to make markets in the Fund’s investments or in their capacity or willingness to transact may increase the Fund’s exposure to this risk. Events that may lead to increased redemptions, such as market disruptions or increases in interest rates, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Securities acquired in a private placement, such as Rule 144A securities, are generally subject to significant liquidity risk because they are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. In other circumstances, liquid investments may become illiquid. Liquidity issues may also make it difficult to value the Fund’s investments. The Fund may invest in liquid investments that become illiquid due to financial distress, or geopolitical events such as sanctions, trading halts or wars. In some cases, especially during periods of market turmoil, there may be no buyers or sellers for securities in certain asset classes and a redemption may dilute the interest of the remaining shareholders.

Management Risk

Management risk is the risk that the portfolio managers’ investment techniques could fail to achieve the Fund’s objective and could cause your investment in the Fund to lose value. The Fund is subject to management risk because the Fund is actively managed. The portfolio managers will apply their investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that such decisions will produce the desired results. For example, securities that the portfolio managers expect to appreciate in value may, in fact, decline. Similarly, in some cases, derivative and other investment techniques may be unavailable or the portfolio managers may determine not to use them, even under market conditions where their use could have benefited the Fund.

Mid-Capitalization Companies Risk

Compared to companies with large market capitalization, mid-capitalization companies are more likely to have limited product lines, markets or financial resources, or to depend on a small, inexperienced management group. Securities of these companies often trade less frequently and in limited volume and their prices may fluctuate more than stocks of large-capitalization companies. Securities of mid-capitalization companies may therefore be more vulnerable to

adverse developments than those of large-capitalization companies. As a result, it may be relatively more difficult for the Fund to buy and sell securities of mid-capitalization companies.

Models and Data Risk

The Subadviser utilizes various proprietary quantitative models to identify investment opportunities. There is a possibility that one or all of the quantitative models may fail to identify profitable opportunities at any time. Furthermore, the models may incorrectly identify opportunities and these misidentified opportunities may lead to substantial loss. Models may be predictive in nature and such models may result in an incorrect assessment of future events. Data used in the construction of models may prove to be inaccurate or stale, which may result in losses for the Fund. Investments selected using the models may perform differently than expected as a result of the market factors used in creating models, the weight given to each such market factor, changes from the market factors’ historical trends and technical issues in the construction and implementation of the models (e.g., data problems, and/or software issues). The Adviser’s judgments about the weightings among various models and strategies may be incorrect, adversely affecting performance.

New and Smaller Sized Fund Risk

Funds that are relatively new or relatively small are subject to additional risks. The Fund is relatively new and has a limited operating history for investors to evaluate and may not be successful in implementing its investment strategies. The Fund is relatively small and may fail to attract sufficient assets to achieve or maintain economies of scale, which could result in the Fund being liquidated at any time without shareholder approval and at a time that may not be favorable for all shareholders. In addition, the Fund is relatively small and may not be successful in implementing its investment strategies after the Fund’s assets grow beyond a certain size, which could adversely affect the Fund’s performance. Smaller ETFs will often have a lower public float and lower trading volumes, leading to wider bid/ask spreads.

Operational Risk

The Fund is exposed to operational risk arising from a number of factors, including but not limited to human error, processing and communication errors, errors of the Fund’s service providers, market makers, listing exchange, Authorized Participants or the issuers of securities in which the Fund invests or with which it does business, failed or inadequate processes and technology or systems failures. The Fund seeks to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate for those risks that they are intended to address.

Premium/Discount Risk

Shares of the Fund are listed for trading on the NYSE Arca and are bought and sold in the secondary market at market prices that may differ from their most recent NAV. The NAV of the Fund’s shares will generally fluctuate with changes in the market value of the Fund’s holdings. The market value of the Fund’s shares will fluctuate, in some cases materially, in response to changes in the Fund’s NAV, the intraday value of the Fund’s holdings, and the relative supply and demand for the Fund’s shares on the exchange. The Adviser and Subadviser cannot predict whether shares will trade below, at or above their NAV. Price differences may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related to, but not identical to, the same forces influencing the prices of the securities held by the Fund. While the creation/redemption feature is designed to make it more likely that the Fund’s shares normally will trade on stock exchanges at prices close to the Fund’s next calculated NAV, exchange prices are not expected to correlate exactly with the Fund’s NAV due to timing reasons, supply and demand imbalances and other factors. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for shares may result in shares trading at a significant premium or discount to NAV and/or in a reduced liquidity of your investment. During such periods, you may be unable to sell your shares or may incur significant losses if you sell your shares. There are various methods by which investors can purchase and sell shares and various types of orders that may be placed. Investors should consult their financial intermediary before purchasing or selling shares of the Fund. If a shareholder purchases shares at a time when the market price is at a premium to the NAV or sells shares at a time when the market price is at a discount to the NAV, the shareholder may sustain losses.

Recent Market Events Risk

The COVID-19 pandemic resulted in, among other things, significant market volatility, exchange trading suspensions and closures, declines in global financial markets, higher default rates, and economic downturns and recessions, and may continue to have similar effects in the future.Such factors, and the effects of other infectious illness outbreaks, epidemics, or pandemics, may have a significant adverse effect on the Fund’s performance, exacerbate other risks that apply to the Fund, exacerbate existing economic, political, or social tensions, have the potential to impair the ability of the Fund’s investment adviser, subadviser, or other service providers to serve the Fund, and lead to disruptions that negatively impact the Fund.

In addition, Russia’s military invasion of Ukraine in February 2022, the resulting responses by the United States and other countries, and the potential for wider conflict could increase volatility and uncertainty in the financial markets and adversely affect regional and global economies. These and any related events could significantly impact the Fund’s performance and the value of an investment in the Fund, even if the Fund does not have direct exposure to Russian issuers or issuers in other countries affected by the invasion.

Secondary Market Trading Risk

The Fund is subject to a number of secondary market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation and redemption process, any of which may lead to the Fund’s shares trading at a premium or discount. Investors buying or selling shares of the Fund in the secondary market will pay brokerage commissions or other charges imposed by and determined by the broker-dealers, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of shares. In addition, secondary market investors will also incur the cost of the difference between the price that an investor is willing to pay for shares (the “bid” price)

and the price at which an investor is willing to sell shares (the “ask” price). This difference in bid and ask prices is often referred to as the “spread” or “bid/ask spread.” The bid/ask spread varies over time for shares based on trading volume and market liquidity, and is generally lower if the Fund’s shares have more trading volume and market liquidity and higher if the Fund’s shares have little trading volume and market liquidity. Further, increased market volatility may cause increased bid/ask spreads. Due to the costs of buying or selling shares, including bid/ask spreads, frequent trading of shares may significantly reduce investment results and an investment in shares may not be advisable for investors who anticipate regularly making small investments. Shares of the Fund, similar to shares of other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases associated with being sold short.

Trading Issues Risk

Although the Fund’s shares are listed on the NYSE Arca, there can be no assurance that an active or liquid trading market for them will develop or be maintained. Trading in shares of the Fund on the NYSE Arca may be halted due to market conditions or for reasons that, in the view of the NYSE Arca, make trading in shares inadvisable. In addition, trading in shares on the NYSE Arca is subject to trading halts caused by extraordinary market volatility pursuant to the NYSE Arca’s “circuit breaker” rules (rules that require a halt in trading in a specific period of time when market prices decline by a specified percentage during the course of a trading day). There can be no assurance that the requirements of the NYSE Arca necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. In addition, an exchange or market may close or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses.

Valuation Risk

This is the risk that the Fund has valued certain securities or positions at a higher price than the price at which they can be sold. This risk may be especially pronounced for investments, such as derivatives, which may be illiquid or which may become illiquid.

Differences Between Investing in an ETF and a Mutual Fund

Shareholders of the Fund should be aware of certain differences between investing in an ETF and a mutual fund.

Redeemability

Mutual fund shares may be bought from, and redeemed with, the issuing fund for cash at NAV typically calculated once at the end of each business day. Shares of the Fund, by contrast, cannot be purchased from or redeemed with the Fund except by or through Authorized Participants and then typically for an in-kind basket of securities. In contrast, investors who are not Authorized Participants purchase and sell shares generally for cash on a secondary market at the prevailing market price. In addition, the Fund issues and redeems shares on a continuous basis only in large blocks of shares, typically 10,000 shares, called Creation Units. The number of shares comprising a Creation Unit may change from time to time.

Exchange Listings

Unlike mutual funds, the Fund’s shares are listed for trading on U.S. stock exchanges and may be listed on non-U.S. stock exchanges in the future. These stock exchanges may include exchanges other than the NYSE Arca, the U.S. stock exchange where the Fund’s primary listing is maintained. Investors can purchase and sell individual shares of the Fund only on the secondary market through a broker-dealer. There can be no assurance that the Fund’s shares will continue to trade on any such stock exchange or in any market or that the Fund’s shares will continue to meet the requirements for listing or trading on any exchange or in any market. Natixis Investment Managers, LLC or its affiliates at various times may control the Fund and may account for all or a significant portion of the trading volume in the Fund’s shares. See “Trading Issues Risk” above. Additionally, the Fund’s shares may be less actively traded in certain markets than others, and investors are subject to the execution and settlement risks and market standards of the market where they or their broker-dealers direct their trades for execution. Certain information available to investors who trade fund shares on a U.S. stock exchange during regular U.S. market hours may not be available to investors who trade in other markets, which may result in secondary market prices in such markets being less efficient. Secondary market transactions do not occur at NAV, but at market prices that change throughout the day, based on the supply of, and demand for, shares of the Fund. Given that shares can be purchased and redeemed only by or through Authorized Participants directly with the Fund in Creation Units (unlike shares of many closed-end funds, which frequently trade at appreciable discounts from, and sometimes at premiums to, their NAV), the Adviser and Subadviser believe that large discounts or premiums to the NAV of shares should not be sustained. However, the market prices of the Fund’s shares may deviate significantly from the NAV of the shares during periods of market volatility. See “Premium/Discount Risk” and “Secondary Market Trading Risk” above.

In-Kind Redemptions – Potential Benefits and Limitations

Unlike shares of many mutual funds that are only bought and sold at closing NAVs, the shares of the Fund are expected to be created and redeemed principally in kind in Creation Units at each day’s market close at the Fund’s NAV and tradable in a secondary market on an intraday basis at prevailing market prices. These in kind arrangements will potentially mitigate adverse effects on the Fund’s portfolio that could arise from frequent cash purchase and redemption transactions that continuously affect the NAV of the Fund. These transactions may reduce transaction costs borne by the Fund. Moreover, relative to mutual funds, where frequent redemptions can have an adverse tax impact on taxable shareholders because of the need to sell portfolio securities that, in turn, may generate taxable gain, the Fund’s in-kind redemption mechanism is expected to reduce the need to sell portfolio securities to meet redemption requests, and therefore may lessen the taxable gain generated by such sales of portfolio securities. The Fund cannot predict to what extent, if any, it will

redeem its shares in kind rather than in cash; nor can the Fund predict the extent to which any such in kind redemption will reduce the taxable gain recognized in connection therewith. The Fund may still realize gains related to either cash redemptions or rebalancing transactions which may need to be distributed.

More Information About the Fund’s Strategies

Temporary Defensive Measures

Temporary defensive measures may be used by the Fund during adverse economic, market, political or other conditions. In this event, the Fund may hold any portion of its assets in cash (U.S. dollars, foreign currencies or multinational currency units) and/or invest in cash equivalents such as money market instruments or high-quality debt securities as it deems appropriate. The Fund may miss certain investment opportunities if it uses defensive strategies and thus may not achieve its investment goal.

Percentage Investment Limitations

Except as set forth in the SAI, the percentage limitations set forth in this Prospectus and the SAI apply at the time an investment is made and shall not be considered violated unless an excess or deficiency occurs or exists immediately after and as a result of such investment.

Portfolio Holdings

A description of the Fund’s policies and procedures with respect to the disclosure of the Fund’s portfolio securities is available in the section “Portfolio Holdings Information” in the SAI. A “snapshot” of the Fund’s investments may be found in its annual and semiannual reports. In addition, top holdings, as well as daily holdings, of the Fund can be found at im.natixis.com/us/fund-documents (in the “Daily/Monthly/Quarterly” column under the “Holdings” section, click the download button for the Fund).

Management Team

Meet the Fund’s Investment Adviser and Subadviser

Adviser

Natixis Advisors, located at 888 Boylston Street, Suite 800, Boston, Massachusetts 02199-8197, serves as the adviser to the Fund. Natixis Advisors oversees, evaluates, and monitors the subadvisory services provided to the Fund. It also provides general business management and administration to the Fund. Natixis Advisors does not determine what investments will be purchased or sold by the Fund. The Subadviser listed below makes the investment decisions for the Fund.

Subadviser

The Subadviser has full investment discretion and makes all determinations with respect to the investment of the assets of the Fund, subject to the general supervision of the Fund’s Adviser and the Board of Trustees.

Gateway, located at 312 Walnut Street, Cincinnati, Ohio 45202, serves as the subadviser to the Fund. Gateway is a registered investment adviser that specializes in the management of index option-based strategies for high net worth individuals, investment companies, pension and profit sharing plans, charitable organizations and corporations. Gateway and its predecessor organizations have provided investment advisory services since 1977. Gateway had approximately $8.7 billion in assets under management as of June 30, 2023.

The aggregate advisory and subadvisory fee to be paid by the Fund as a percentage of the Fund’s average daily net assets is 0.24%.

Subadvisory Agreements

Natixis Advisors and the Natixis Funds have received an exemptive order from the SEC (the “Order”), which permits Natixis Advisors, subject to approval by the Board of Trustees but without shareholder approval, to hire or terminate, and to modify any existing or future subadvisory agreement with, subadvisers that are not affiliated with Natixis Advisors as well as subadvisers that are indirect or direct wholly-owned subsidiaries of Natixis Advisors or of another company that, indirectly or directly, wholly owns Natixis Advisors. Before any Natixis Fund can begin to rely on the exemptions described above, a majority of the shareholders of the Fund must approve the Fund’s ability to rely on the Order. Shareholders of certain Natixis Funds have already approved the Fund’s operation under the manager-of-managers structure contemplated by the Order. If a new subadviser is hired for the Fund, shareholders will receive information about the new subadviser within 90 days of the change.

A discussion of the factors considered by the Board of Trustees in approving the Fund’s investment advisory and subadvisory contracts will be included in the Fund’s shareholder report covering the period in which the approval occurred.

The Funds consider the series of Natixis Funds Trust I, Natixis Funds Trust II, Natixis Funds Trust IV, Gateway Trust, Loomis Sayles Funds I, Loomis Sayles Funds II, Natixis ETF Trust and Natixis ETF Trust II, all of which are advised or subadvised by Natixis Advisors, Loomis, Sayles & Company, L.P., AEW Capital Management, L.P., Gateway, Mirova US LLC, Harris Associates L.P. or Vaughan Nelson Investment Management, L.P. (collectively, the “Affiliated Investment Managers”), to be part of the “same group of investment companies” under Section 12(d)(1)(G) of the 1940 Act for the purchase of other investment companies. The Affiliated Investment Managers are all under common control.

Portfolio Trades

In placing portfolio trades, Gateway may use brokerage firms that market the Fund’s shares or are affiliated with Gateway. In placing trades, Gateway will seek to obtain the best combination of price and execution, which involves a number of subjective factors. Such portfolio trades are subject to applicable regulatory restrictions and related procedures adopted by the Board of Trustees.

Meet the Fund’s Portfolio Managers

The following persons have had primary responsibility for the day-to-day management of the Fund’s portfolio since the dates stated below.

Daniel M. Ashcraft, CFA^®- Daniel M. Ashcraft joined Gateway in 2009 and holds the positions of Vice President and Portfolio Manager at Gateway. He has been co-portfolio manager of the Natixis Gateway Quality Income ETF since 2023. Mr. Ashcraft received a B.A. from Miami University of Ohio. He holds the designation of Chartered Financial Analyst^®.

Michael T. Buckius, CFA^®- Mr. Buckius joined Gateway in 1999 and holds the positions of President, Chief Executive Officer and Chief Investment Officer at Gateway. He has been co-portfolio manager of the Natixis Gateway Quality Income ETF since 2023 and serves as co-portfolio manager of several funds sub-advised by Gateway. Mr. Buckius holds a B.A. and M.B.A. in Finance from Loyola College in Baltimore. He holds the designation of Chartered Financial Analyst^®.

Kenneth H. Toft, CFA^® - Mr. Toft joined Gateway in 1992 and holds the positions of Senior Vice President and Portfolio Manager at Gateway. He has been co-portfolio manager of the Natixis Gateway Quality Income ETF since 2023. Mr. Toft holds a B.A. and M.B.A. from the University of Cincinnati. He holds the designation of Chartered Financial Analyst^®.

Mitchell J. Trotta, CFA^® - Mr. Trotta joined Gateway in 2016 and holds the position of Portfolio Manager at Gateway. He has been co-portfolio manager of the Natixis Gateway Quality Income ETF since 2023. Mr. Trotta received a BBA from the University of Cincinnati. He holds the designation of Chartered Financial Analyst^®.

Other Service Providers

Administrator. Natixis Advisors, 888 Boylston Street, Suite 800, Boston, Massachusetts 02199, serves as the Fund’s administrator and performs certain accounting and administrative services for the Fund.

Distributor. ALPS Distributors, Inc. (“ALPS”), 1290 Broadway, Suite 1000, Denver, Colorado 80203, serves as the Distributor of Creation Units for the Fund on an agency basis. The Distributor will deliver a prospectus to Authorized Participants purchasing Shares in Creation Units and will maintain records of both orders placed with it and confirmations of acceptance furnished by it to Authorized Participants. The Distributor does not maintain a secondary market in shares of the Fund. The Distributor has no role in determining the investment policies of the Fund or which securities are to be purchased or sold by the Fund. The Adviser has entered into an agreement with ALPS under which it makes payments to ALPS in consideration for its services under the Distribution Agreement. The payments made by the Adviser to ALPS do not represent an additional expense to the Fund or its shareholders.

Custodian. State Street Bank and Trust Company (“State Street Bank”), One Congress Street, Suite 1, Boston, MA 02114-2016, serves as the custodian (“Custodian”) for the Fund.

Transfer Agent. State Street Bank, One Congress Street, Suite 1, Boston, MA 02114-2016, acts as shareholder servicing and transfer agent (“Transfer Agent”) for the Fund.

Primary Listing Exchange. The shares of the Fund are listed for trading on the NYSE Arca, a national securities exchange.

Additional Information

The Fund enters into contractual arrangements with various parties, including, among others, the Adviser, the Subadviser, the Authorized Participants, the Distributor and the Fund’s Custodian and Transfer Agent, who provide services to the Fund. Shareholders are not parties to, or intended to be third-party beneficiaries of, any of those contractual arrangements, and those contractual arrangements are not intended to create in any individual shareholder or group of shareholders any right to enforce such arrangements against the service providers or to seek any remedy thereunder against the service providers, either directly or on behalf of the Fund.

This Prospectus provides information concerning the Fund that you should consider in determining whether to purchase shares of the Fund. None of this Prospectus, the SAI or any contract that is an exhibit to the Fund’s registration statement, is intended to, nor does it, give rise to an agreement or contract between the Fund and any investor, or give rise to any contract or other rights in any individual shareholder, group of shareholders or other person other than any rights conferred explicitly by applicable federal or state securities laws that may not be waived.

Shareholder Information

Buying and Selling Shares

Shares of the Fund may be acquired or redeemed directly from the Fund only in Creation Units or multiples thereof, as discussed in the “Creations and Redemptions” section of this Prospectus. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. An Authorized Participant is either a “participating party” (i.e., a broker-dealer or other participant in the clearing process through the Continuous Net Settlement System of the National Securities Clearing Corporation) or a Depository Trust Company (“DTC”) participant, in either case, who has executed an agreement with the Distributor, and accepted by the Transfer Agent, with respect to creations and redemptions of Creation Units. Once created, shares of the Fund generally trade in the secondary market in amounts less than a Creation Unit.

Most investors will buy and sell shares of the Fund in secondary market transactions through broker-dealers. Shares of the Fund are listed for trading on a national securities exchange during the trading day. Shares can be bought and sold throughout the trading day like shares of other publicly traded companies. However, there can be no guarantee that an active trading market will develop or be maintained, or that the Fund shares listing will continue or remain unchanged. The Fund does not impose any minimum investment for shares of the Fund purchased on an exchange. Buying or selling the Fund’s shares involves certain costs that apply to all securities transactions. When buying or selling shares of the Fund through a financial intermediary, you may incur a brokerage commission or other charges determined by your financial intermediary. Due to these brokerage costs, if any, frequent trading may detract significantly from investment returns. In addition, you may also incur the cost of the spread (the difference between the bid price and the ask price of the Fund’s shares). The commission is frequently a fixed amount and may be a significant cost for investors seeking to buy or sell small amounts of Fund shares. The spread varies over time for shares of the Fund based on its trading volume and market liquidity, and is generally narrower if the Fund has more trading volume and market liquidity and wider if the Fund has less trading volume and market liquidity. Shares of the Fund trade on an exchange at prices that may differ to varying degrees from the daily NAV of the shares.

The Fund’s primary listing exchange is the NYSE Arca. The NYSE Arca is open for trading Monday through Friday and is closed on the following holidays: New Year’s Day, Martin Luther King, Jr. Day, Presidents’ Day, Good Friday, Memorial Day, Juneteenth National Independence Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day.

A “Business Day” with respect to the Fund is each day the Fund is open and includes any day that the Fund is required to be open under Section 22(e) of the 1940 Act. Orders from Authorized Participants to create or redeem Creation Units will only be accepted on a Business Day. On days when the NYSE Arca closes earlier than normal, the Fund may require orders to create or redeem Creation Units to be placed earlier in the day. Please see the SAI for more information.

Investments by Registered Investment Companies

Section 12(d)(1) of the 1940 Act restricts investments by registered investment companies and companies relying on Section 3(c)(1) or Section 3(c)(7) of the 1940 Act in the securities of other investment companies. Registered investment companies are permitted to invest in the Fund beyond the limits set forth in Section 12(d)(1) subject to certain terms and conditions including that such investment companies enter into an agreement with the Fund.

Frequent Purchases and Redemptions of Fund Shares

The Board of Trustees has not adopted a policy of monitoring for frequent purchases and redemptions of Fund shares (“frequent trading”) that appear to attempt to take advantage of potential arbitrage opportunities presented by a lag between a change in the value of the Fund’s portfolio securities after the close of the primary markets for the Fund’s portfolio securities and the reflection of that change in the Fund’s NAV (“market timing”). The Fund believes this is appropriate because ETFs, such as the Fund, are intended to be attractive to arbitrageurs, as trading activity is critical to ensuring that the market price of Fund shares remains at or close to NAV. Since the Fund issues and redeems Creation Units at NAV plus applicable transaction fees, and the Fund’s shares may be purchased and sold on the NYSE Arca at prevailing market prices, the risks of frequent trading are limited.

Rule 12b-1 Fees

While there are no current plans to charge Rule 12b-1 fees, the Fund has adopted a Rule 12b-1 Plan under which the Fund is authorized to pay distribution and/or service fees to the Fund’s Distributor and other firms that provide distribution and shareholder services. Rule 12b-1 fees that are paid to the Fund’s Distributor may be used by the Distributor for expenses relating to the distribution of, and shareholder or administrative services for holders of, shares, and for the payment of service fees that come within Rule 2341(d) of the Conduct Rules of the Financial Industry Regulatory Authority.

Because Rule 12b-1 fees may be paid out of the Fund’s assets on an ongoing basis, over time they may increase the cost of your investment and may cost shareholders more than other types of sales charges. Currently, no Rule 12b-1 fees are charged.

Payment to Broker-Dealers and Other Financial Intermediaries

The Adviser or its affiliates may make payments to broker-dealers, registered investment advisers, banks or other intermediaries (together “intermediaries”) related to marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting

systems, or their making shares of the Fund and certain other Natixis funds available to their customers generally and in certain investment programs. Such payments, which may be significant to the intermediary, are not made by the Fund. Rather, such payments are made by the Adviser or its affiliates from their own resources, which come directly or indirectly in part from fees paid by the Natixis funds complex. Payments of this type are sometimes referred to as revenue sharing payments. A financial intermediary may make decisions about which investment options it recommends or makes available, or the level of services provided, to its customers based on the payments it is eligible to receive. Therefore, such payments to an intermediary create conflicts of interest between the intermediary and its customers and may cause the intermediary to recommend the Fund or other Natixis funds over another investment. More information regarding these payments is contained in the Fund’s SAI. Please contact your salesperson or other investment professional for more information regarding any such payments his or her firm may receive from the Adviser or its affiliates.

Share Prices

The trading prices of the Fund’s shares in the secondary market generally differ from the Fund’s daily NAV and are affected by market forces such as the supply of and demand for shares of the Fund and shares of underlying securities held by the Fund, economic conditions and other factors.

Net Asset Value

NAV is the price of one share of the Fund without a sales charge, and is calculated each business day using this formula:

The policies and procedures used to determine the NAV of Fund shares are summarized below:

•

A share’s NAV is determined at the close of regular trading on the New York Stock Exchange (“NYSE”) on the days the NYSE is open for trading. This is normally 4:00 p.m., Eastern time. The Fund’s shares will not be priced on the days on which the NYSE is closed for trading. In addition, the Fund’s shares will not be priced on the holidays listed in the SAI. See the section “Net Asset Value” in the SAI for more details.

•	The price that an Authorized Participant pays for purchasing or redeeming shares in Creation Units will be based upon the NAV next calculated after an order is received by the Transfer Agent “in good order” (meaning that the order is complete and contains all necessary information).

•

Requests received by the Transfer Agent in good order during a trading window that is open after the NYSE closes will be processed based upon the NAV determined at the close of regular trading on the next day that the NYSE is open. If the Transfer Agent receives the order in good order during a trading window that is open prior to the NYSE market close, the shareholder will receive that day’s NAV. See the section “Creations and Redemptions” in the SAI for more details.

•	If the Fund invests in foreign securities, it may experience NAV changes on days when you cannot buy or sell its shares.

Fund securities and other investments for which market quotations are readily available, as outlined in the Fund’s policies and procedures, are valued at market value. The Fund may use independent pricing services to obtain market quotations and other valuation information, such as evaluated bids. Generally, Fund securities and other investments are valued as follows:

•

Equity securities (including shares of closed-end investment companies and ETFs), exchange traded notes, rights and warrants — listed equity securities are valued at the last sale price quoted on the exchange where they are traded most extensively or, if there is no reported sale during the day, the closing bid quotation as reported by an independent pricing service. Securities traded on the NASDAQ Global Select Market, NASDAQ Global Market and NASDAQ Capital Market are valued at the NASDAQ Official Closing Price (“NOCP”), or if lacking an NOCP, at the most recent bid quotations on the applicable NASDAQ Market. Unlisted equity securities (except unlisted preferred equity securities discussed below) are valued at the last sale price quoted in the market where they are traded most extensively or, if there is no reported sale during the day, the closing bid quotation as reported by an independent pricing service. If there is no sale price or closing bid quotation available, unlisted equity securities will be valued using evaluated bids furnished by an independent pricing service, if available. In some foreign markets, an official close price and a last sale price may be available from the foreign exchange or market. In those cases, the official close price is used. Valuations based on information from foreign markets may be subject to the Fund’s fair value policies described below. If a right is not traded on any exchange, its value is based on the market value of the underlying security, less the cost to subscribe to the underlying security (e.g., to exercise the right), adjusted for the subscription ratio. If a warrant is not traded on any exchange, a price is obtained from a broker-dealer.

•

Debt securities and unlisted preferred equity securities — evaluated bids furnished to the Fund by an independent pricing service using market information, transactions for comparable securities and various relationships between securities, if available, or bid prices obtained from broker-dealers.

•	Senior Loans — bid prices supplied by an independent pricing service, if available, or bid prices obtained from broker-dealers.

•	Equity-Linked Notes — are priced generally by an approved independent third party or affiliated pricing service or at an evaluated price provided by a counterparty or broker/dealer.

•

Options — domestic exchange-traded index and single name equity options contracts (including options on ETFs) are valued at the mean of the National Best Bid and Offer quotations as determined by the Options Price Reporting Authority. Foreign exchange-traded single name equity options contracts are valued at the most recent settlement price. Options contracts on foreign indices are priced at the most recent settlement price. Options on futures contracts are valued using the current settlement price on the exchange on which, over time, they are traded most extensively. Other exchange-traded

options are valued at the average of the closing bid and ask quotations on the exchange on which, over time, they are traded most extensively. OTC currency options and swaptions are valued at mid prices (between the bid price and the ask price) supplied by an independent pricing service, if available. Other OTC options contracts (including currency options and swaptions not priced through an independent pricing service) are valued based on prices obtained from broker-dealers. Valuations based on information from foreign markets may be subject to the Fund’s fair value policies described below.

•	Futures — most recent settlement price on the exchange on which the Adviser believes that, over time, they are traded most extensively. Valuations based on information from foreign markets may be subject to the Fund’s fair value policies described below.

•	Forward Foreign Currency Contracts — interpolated rates determined based on information provided by an independent pricing service.

Foreign denominated assets and liabilities are translated into U.S. dollars based upon foreign exchange rates supplied by an independent pricing service. Fund securities and other investments for which market quotations are not readily available are valued at fair value as determined in good faith by the Adviser and Subadviser. The Fund may also value securities and other investments at fair value in other circumstances such as when extraordinary events occur after the close of a foreign market but prior to the close of the NYSE. This may include situations relating to a single issuer (such as a declaration of bankruptcy or a delisting of the issuer’s security from the primary market on which it has traded) as well as events affecting the securities markets in general (such as market disruptions or closings and significant fluctuations in U.S. and/or foreign markets).

When fair valuing its securities or other investments, the Fund may, among other things, use modeling tools or other processes that may take into account factors such as securities or other market activity and/or significant events that occur after the close of the foreign market and before the time the Fund’s NAV is calculated. Fair value pricing may require subjective determinations about the value of a security, and fair values used to determine the Fund’s NAV may differ from quoted or published prices, or from prices that are used by others, for the same securities. In addition, the use of fair value pricing may not always result in adjustments to the prices of securities held by the Fund. Valuations for securities traded in the OTC market may be based on factors such as market information, transactions for comparable securities, and various relationships between securities or bid prices obtained from broker-dealers. Evaluated prices from an independent pricing service may require subjective determinations and may be different than actual market prices or prices provided by other pricing services. As of the date of this prospectus, the Adviser serves as the Fund’s valuation designee for purposes of compliance with Rule 2a-5 under the 1940 Act.

Distributions

The Fund pays distributions from its investment income and from net realized capital gains.

Distributions from net investment income and distributions from net capital gains, if any, are declared and paid as follows:


	Investment Income Dividends	Capital Gains Distributions
	Declared and Paid	Declared and Paid
Natixis Gateway Quality Income ETF	Monthly	Annually

Dividends and other distributions on shares of the Fund are distributed on a pro rata basis to beneficial owners of such shares. Dividend payments are made through DTC participants and indirect participants (each as described in the “Book Entry” section below) to beneficial owners then of record with proceeds received from the Fund.

No dividend reinvestment service is provided by the Fund. Broker-dealers may make available the DTC book-entry dividend reinvestment service for use by beneficial owners of the Fund for reinvestment of their dividend distributions. Beneficial owners should contact their broker to determine the availability and costs of the service and the details of participation therein. Brokers may require beneficial owners to adhere to specific procedures and timetables. If this service is available and used, dividend distributions of both income and realized gains will be automatically reinvested in additional whole shares of the Fund purchased in the secondary market.

Book Entry

DTC serves as securities depository for the shares. (The shares may be held only in book-entry form; stock certificates will not be issued.) DTC, or its nominee, is the record or registered owner of all outstanding shares. Beneficial ownership of shares will be shown on the records of DTC or its participants (described below). Beneficial owners of shares are not entitled to have shares registered in their names, will not receive or be entitled to receive physical delivery of certificates in definitive form and are not considered the registered holder thereof. Accordingly, to exercise any rights of a holder of shares, each beneficial owner must rely on the procedures of: (i) DTC; (ii) “DTC participants” (i.e., securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations, some of whom (and/or their representatives) own DTC); and (iii) “indirect participants” (i.e., brokers, dealers, banks and trust companies that clear through or maintain a custodial relationship with a DTC participant), either directly or indirectly, through which such beneficial owner holds its interests. The Fund understands that under existing industry practice, in the event the Fund requests any action of holders of shares, or a beneficial owner desires to take any action that DTC, as the record owner of all outstanding shares, is entitled to take, DTC would authorize the DTC participants to take such action and that the DTC participants would authorize the indirect participants and beneficial owners acting through such DTC participants to take such action and would otherwise act upon the instructions of beneficial owners owning through them. As described above, the Fund recognizes DTC or its nominee as the owner of all shares for all purposes.

Creations and Redemptions

Prior to trading in the secondary market, shares of the Fund are “created” at NAV by market makers, large investors and institutions only in block-size Creation Units of 10,000 shares or multiples thereof. Each “creator” or Authorized Participant enters into an Authorized Participant agreement with the Fund’s Distributor.

A creation transaction order, which is subject to acceptance by the Distributor, generally takes place when an Authorized Participant deposits into the Fund a designated portfolio of securities (including any portion of such securities for which cash may be substituted) and a specified amount of cash approximating the holdings of the Fund in exchange for a specified number of Creation Units.

Similarly, shares can be redeemed only in Creation Units, generally for a designated portfolio of securities (including any portion of such securities for which cash may be substituted) held by the Fund and a specified amount of cash. Except when aggregated in Creation Units, shares are not redeemable by the Fund.

The prices at which creations and redemptions occur are based on the next calculation of NAV after a creation or redemption order is received in an acceptable form under the Authorized Participant agreement. These prices may differ from the market price of the Fund’s shares.

Only an Authorized Participant may create or redeem Creation Units directly with the Fund. In the event of a system failure or other interruption, including disruptions at market makers or Authorized Participants, orders to purchase or redeem Creation Units either may not be executed according to the Fund’s instructions or may not be executed at all, or the Fund may not be able to place or change orders.

When the Fund engages in in kind transactions, the Fund intends to comply with the U.S. federal securities laws in accepting securities for deposit and satisfying redemptions with redemption securities by, among other means, assuring that any securities accepted for deposit and any securities used to satisfy redemption requests will be sold in transactions that would be exempt from registration under the Securities Act of 1933, as amended (“Securities Act”). Further, an Authorized Participant that is not a “qualified institutional buyer,” as such term is defined under Rule 144A of the Securities Act, will not be able to receive restricted securities eligible for resale under Rule 144A.

Creations and redemptions must be made through a firm that is either a member of the Continuous Net Settlement System of the National Securities Clearing Corporation or a DTC participant and has executed an agreement with the Distributor with respect to creations and redemptions of Creation Unit aggregations. The Fund imposes a creation transaction fee and a redemption transaction fee to offset transfer and other transaction costs associated with the issuance and redemption of Creation Units. Information about the procedures regarding creation and redemption of Creation Units (including the cut-off times for receipt of creation and redemption orders) and the applicable transaction fees are included in the Fund’s SAI.

Your broker-dealer or agent may charge you a fee to effect transactions in Fund shares.

Taxation

Except as noted, the discussion below addresses only the U.S. federal income tax consequences of an investment in the Fund and does not address any non-U.S., state or local tax consequences.

The Fund intends to meet all requirements under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), necessary to qualify and be eligible for treatment each year as a “regulated investment company” and thus does not expect to pay any U.S. federal income tax on income and capital gains that are timely distributed to shareholders.

Unless otherwise noted, the discussion below, to the extent it describes shareholder-level tax consequences, pertains solely to taxable shareholders.

Taxation of Distributions from the Fund. For U.S. federal income tax purposes, distributions of investment income are generally taxable to Fund shareholders as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned (or is deemed to have owned) the investments that generated them, rather than how long a shareholder has owned his or her shares. Distributions attributable to the excess of net long-term capital gains from the sale of investments that the Fund owned (or is deemed to have owned) for more than one year over net short-term capital losses from the sale of investments that the Fund owned (or is deemed to have owned) for one year or less, and that are properly reported by the Fund as capital gain dividends (“Capital Gain Dividends”) generally will be taxable to a shareholder receiving such distributions as long-term capital gain includible in net capital gain and taxed to individuals at reduced rates. Distributions attributable to the excess of net short-term capital gains from the sale of investments that the Fund owned (or is deemed to have owned) for one year or less over net long-term capital losses from the sale of investments that the Fund owned (or is deemed to have owned) for more than one year, will be taxable as ordinary income.

Distributions of investment income properly reported by the Fund as derived from “qualified dividend income” will be taxed in the hands of individuals at the reduced rates applicable to net capital gain, provided that the holding period and other requirements are met at both the shareholder and Fund levels. Income generated by investments in fixed-income securities, derivatives and REITs generally is not eligible for treatment as qualified dividend income. Dividends received by the Fund from foreign corporations that are not eligible for the benefits of a comprehensive income tax treaty with the U.S. (other than dividends paid on stock of such a foreign corporation that is readily tradable on an established securities market in the U.S.) will not be eligible for treatment as qualified dividend income.

A 3.8% Medicare contribution tax is imposed on the net investment income of certain individuals, trusts and estates to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends, including any Capital Gain Dividends paid by the Fund, and net capital gains recognized on the sale, redemption, exchange or other taxable disposition of shares of the Fund.

Fund distributions are taxable whether shareholders receive them in cash or reinvest them in additional shares. In addition, Fund distributions are taxable to shareholders even if they are paid from income or gains earned by the Fund before a shareholder’s investment (and thus were included in the price the shareholder paid for his or her shares). Such distributions are likely to occur in respect of shares purchased at a time when the Fund’s NAV reflects gains that are either unrealized or realized but not distributed.

Dividends and distributions declared by the Fund and payable to shareholders of record in October, November or December of one year and paid in January of the next year generally are taxable in the year in which the distributions are declared, rather than the year in which the distributions are received.

Dividends derived from interest on securities issued by the U.S. government or its agencies or instrumentalities, if any, may be exempt from state and local income taxes. The Fund will advise shareholders annually of the proportion of its dividends that are derived from such interest.

Dividends derived from interest on securities issued by the U.S. government or its agencies or instrumentalities, if any, may be exempt from state and local income taxes. Each Fund will advise shareholders annually of the proportion of its dividends that are derived from such interest. Distributions by the Fund to retirement plans and other investors that qualify for tax-advantaged treatment under U.S. federal income tax laws generally will not be taxable, although distributions by retirement plans to their participants may be taxable. Special tax rules apply to investments through such retirement plans. If your investment is through such a plan, you should consult your tax adviser to determine the suitability of the Fund as an investment through your plan and the tax treatment of distributions to you (including distributions of amounts attributable to an investment in the Fund) from the plan.

Redemption, Sale or Exchange of Fund Shares. A redemption, sale or exchange of Fund shares (including an exchange of Fund shares for shares of another Natixis Fund or Gateway Fund) is a taxable event and generally will result in recognition of gain or loss. Gain or loss, if any, recognized by a shareholder on a redemption, sale, exchange or other taxable disposition of Fund shares generally will be taxed as long-term capital gain or loss if the shareholder held the shares for more than one year, and as short-term capital gain or loss if the shareholder held the shares for one year or less, assuming in each case that the shareholder held the shares as capital assets. Short-term capital gains generally are taxed at the rates applicable to ordinary income. Any loss realized upon a disposition of shares held for six months or less will be treated as long-term, rather than short-term, capital loss to the extent of any Capital Gain Dividends received by the shareholder with respect to the shares. The deductibility of capital losses is subject to limitations.

Taxation of Certain Fund Investments. The Fund’s investments in certain debt obligations (such as those issued with “OID” or accrued market discount, in each case, as defined in the SAI), mortgage-backed securities, asset-backed securities, REITs and derivatives may cause the Fund to recognize taxable income in excess of the cash generated by such investments. Thus, the Fund could be required to liquidate investments, including at times when it is not advantageous to do so, in order to satisfy the distribution requirements applicable to regulated investment companies under the Code. In addition, the Fund’s investments in derivatives may affect the amount, timing or character of distributions to shareholders. The Fund may at times purchase debt instruments at a discount from the price at which they were originally issued, especially during periods of rising interest rates. For federal income tax purposes, some or all of this market discount will, when recognized as income by the Fund, be included in the Fund’s ordinary income, and will be taxable to shareholders as such when it is distributed.

Backup Withholding. The Fund is required in certain circumstances to apply backup withholding on taxable dividends, redemption proceeds and certain other payments that are paid to any shareholder who does not furnish to the Fund certain information and certifications or who is otherwise subject to backup withholding.

Please see the SAI for additional information on the U.S. federal income tax consequences of an investment in the Fund.

You should consult your tax adviser for more information on your own situation, including possible U.S. federal, state, local, foreign or other applicable taxes.

Sales of Fund Shares

Your sale of Fund shares is a taxable transaction for U.S. federal income tax purposes, and may also be subject to state and local taxes. When you sell your shares, you will generally recognize a capital gain or loss in an amount equal to the difference between your adjusted tax basis in the shares and the amount received. Generally, this capital gain or loss is long-term or short-term depending on whether your holding period exceeds one year, except that any loss realized on shares held for six months or less will be treated as a long-term capital loss to the extent of any capital gain dividends that were received on the shares. Additionally, any loss realized on a sale of shares of the Fund may be disallowed under “wash sale” rules to the extent the shares disposed of are replaced with other shares of the Fund within a period of 61 days beginning 30 days before and ending 30 days after the date of disposition, including pursuant to a dividend reinvestment in shares of the Fund. If disallowed, the loss will be reflected in an adjustment to the basis of the shares acquired.

Other Information

Non-U.S. investors are generally not subject to U.S. withholding tax with respect to capital gain dividends, short-term capital gain dividends and interest-related dividends, as defined in the SAI and subject to limitations set forth in the SAI. With respect to distributions other than capital gain dividends, short-term capital gain dividends and interest-related dividends, non-U.S. shareholders are generally subject to U.S. withholding tax as a rate of 30% (or lower applicable treaty rate). Non-U.S. investors may also be subject to estate tax with respect to their Fund shares.

Legislation passed by Congress requires reporting to you and the Internal Revenue Service annually on Form 1099-B not only of the gross proceeds of Fund shares you sell or redeem but also of their cost basis. Shareholders should contact their intermediaries with respect to reporting of cost basis and available elections with respect to their accounts. You should carefully review the cost basis information provided by the applicable intermediary and make any additional basis holding period or other adjustments that are required when reporting these amounts on your federal income tax returns.

Authorized Participant Taxes on Creations and Redemptions of Created Units

Authorized Participants should consult their tax advisors about the federal, state, local or foreign tax consequences of purchasing and redeeming Creation Units in the Fund.

Other Information

Premium/Discount Information

Information regarding how often the shares of the Fund traded on the NYSE Arca at a price above (i.e., at a premium) or below (i.e., at a discount) the NAV of the Fund during the most recently completed calendar year, and the most recently completed calendar quarters since that year, as applicable, can be found at im.natixis.com.

Continuous Offering

You should be aware of certain legal risks unique to investors purchasing Creation Units directly from the Fund. Because new Creation Units are issued and sold by the Fund on an ongoing basis, a “distribution,” as such term is used in the Securities Act, may occur at any point. Broker-dealers and other persons are cautioned that some activities on their part may, depending on the circumstances, result in their being deemed participants in a distribution in a manner that could render them statutory underwriters and subject them to the prospectus delivery and liability provisions of the Securities Act.

For example, a broker-dealer firm or its client may be deemed a statutory underwriter if it takes Creation Units after placing an order with the Distributor, breaks them down into constituent shares, and sells such shares directly to customers, or if it chooses to couple the creation of a supply of new shares with an active selling effort involving solicitation of secondary market demand for shares. A determination of whether one is an underwriter for purposes of the Securities Act must take into account all the facts and circumstances pertaining to the activities of the broker-dealer or its client in the particular case, and the examples mentioned above should not be considered a complete description of all the activities that could lead to a categorization as an underwriter.

Broker-dealers who are not “underwriters” but are participating in a distribution of shares are generally required to deliver a prospectus. This is because the prospectus delivery exemption in Section 4(a)(3) of the Securities Act is not available in respect of such transactions as a result of Section 24(d) of the 1940 Act. As a result, broker-dealer firms should note that dealers who are not underwriters but are participating in a distribution (as contrasted with ordinary secondary market transactions) and thus dealing with the shares that are part of an overallotment within the meaning of Section 4(a)(3)(A) of the Securities Act would be unable to take advantage of the prospectus delivery exemption provided by Section 4(a)(3) of the Securities Act. Firms that incur a prospectus delivery obligation with respect to shares are reminded that, under Rule 153 of the Securities Act, a prospectus delivery obligation under Section 5(b)(2) of the Securities Act owed to an exchange member in connection with a sale on the NYSE Arca is satisfied by the fact that the prospectus is available at the NYSE Arca upon request. The prospectus delivery mechanism provided in Rule 153 is only available with respect to transactions on an exchange.

In addition, certain affiliates of the Fund, the Adviser and the Subadviser may purchase and resell Fund shares pursuant to this Prospectus.

Conflicts of Interest

It is possible that, from time to time, Gateway or its affiliates (including their directors, partners, trustees, managing members, officers and employees (collectively, the “Affiliates”)) may, subject to compliance with applicable law, purchase and hold shares of the Fund. Increasing the Fund’s assets may enhance liquidity, investment flexibility and diversification. Gateway and its Affiliates reserve the right, subject to compliance with applicable law, to sell or redeem at any time some or all of the shares of the Fund acquired for their own accounts. A large sale or redemption of shares of the Fund by Gateway or its Affiliates could significantly reduce the asset size of the Fund, which might have an adverse effect on the Fund’s liquidity, investment flexibility and portfolio diversification. Gateway seeks to consider the effect of redemptions on the Fund and other shareholders in deciding whether to redeem its shares. For more information about conflicts of interest, see the Material Conflicts of Interest section in the SAI.

Prior Related Performance of Similarly Managed Accounts

Natixis Gateway Quality Income ETF - Prior Performance of Subadviser’s Similarly Managed Accounts

The following table sets forth historical performance information for the institutional accounts managed by Gateway that have substantially similar investment objectives, policies, strategies, risks and investment restrictions as the Fund (the “Composite”).

The Composite data is provided to illustrate the past performance of Gateway in managing substantially similar accounts as measured against a specified market index and does not represent the performance of the Fund. The accounts in the Composite are separate and distinct from the Fund; its performance is not intended as a substitute for the Fund’s performance and should not be considered a prediction of the future performance of the Fund or of Gateway.

The Composite’s returns were calculated on a total return basis, include all dividends and interest, accrued income and realized and unrealized gains and losses, and assume the reinvestment of earnings. All returns reflect the deduction of brokerage commissions and execution costs paid by the accounts, without provision for federal or state income taxes. “Net of Fees” figures also reflect the deduction of investment advisory fees and all other actual fees and expenses, including sales charges. The Composite includes all actual discretionary accounts managed by Gateway for at least one full month that have investment objectives, policies, strategies, risks and investment restrictions substantially similar to those of the Fund. The Composite may include both tax-exempt and taxable accounts.

Securities transactions are accounted for on trade date and accrual accounting is utilized. Cash and equivalents are included in performance returns. Monthly returns of the Composite combine the individual accounts’ returns (calculated on a time-weighted rate of return basis that is revalued daily) by asset-weighting each account’s asset value as of the beginning of the month.

The accounts that are included in the Composite may be subject to lower expenses than the Fund and may not be subject to the diversification requirements, specific tax restrictions and investment limitations imposed on the Fund by the 1940 Act or Subchapter M of the Code. Consequently, the performance results for the Composite would have been less favorable had it been subject to the same expenses as the Fund, had it been regulated as an investment company under the federal securities laws or had it been structured as an ETF such as the Fund.

The returns set forth below may not be representative of the results that may be achieved by the Fund in the future, in part because the past results are not necessarily indicative of future results. In addition, the results presented below may not necessarily equate with the return experienced by any particular investor as a result of the timing of investments and redemptions, market conditions and other factors. In addition, the effect of taxes on any investor will depend on such person’s tax status, and the results have not been reduced to reflect any income tax that may have been payable.

The table below shows the since inception and monthly returns for the Composite, and a broad-based securities market index for the period May 1, 2023 through October 31, 2023.


Monthly Returns	May 2023	June 2023	July 2023	August 2023	September 2023	October 2023	Since Inception
Composite (Net of Fees)	1.53%	4.90%	2.33%	-0.60%	-3.11%	-0.46%	4.49%
Composite (Gross of Fees)	1.56%	4.93%	2.36%	-0.57%	-3.08%	-0.43%	4.67%
S&P 500^® Index	0.43%	6.61%	3.21%	-1.59%	-4.47%	-2.10%	1.39%

If you would like more information about the Fund, the following documents are available free upon request:

Annual and Semiannual Reports—Provide additional information about the Fund’s investments. The annual report includes a discussion of the market conditions and investment strategies that significantly affected the Fund’s performance during its last fiscal year.

Statement of Additional Information (SAI)—Provides more detailed information about the Fund and its investment limitations and policies. The SAI has been filed with the SEC and is incorporated into this Prospectus by reference.

For a free copy of the Fund’s annual or semiannual reports or its SAI, to request other information about the Fund, and to make shareholder inquiries generally, contact your financial representative, visit the Fund’s website at im.natixis.com or call the Fund at 800-458-7452.

Important Notice Regarding Delivery of Shareholder Documents:

In our continuing effort to reduce the Fund’s expenses and the amount of mail that you receive from us, we will combine mailings of prospectuses, annual or semiannual reports and proxy statements to your household. If more than one family member in your household owns the same fund or funds described in a single prospectus, report or proxy statement, you will receive one mailing unless you request otherwise. Additional copies of our prospectuses, reports or proxy statements may be obtained at any time by calling 800-458-7452. If you are currently receiving multiple mailings to your household and would like to receive only one mailing or if you wish to receive separate mailings for each member of your household in the future, please call us at the telephone number listed above and we will resume separate mailings within 30 days of your request.

Your financial representative or Natixis ETFs will also be happy to answer your questions or to provide any additional information that you may require.

Text-only copies of the Fund’s reports and SAI and other information are available free from the EDGAR Database on the SEC’s Internet site at: www.sec.gov. Copies of this information may also be obtained, after paying a duplicating fee, by electronic request at the following e-mail address: [email protected].

Portfolio Holdings—A description of the Fund’s policies and procedures with respect to the disclosure of the Fund’s portfolio securities is available in the SAI.


Natixis ETFs
Natixis Gateway Quality Income ETF	NYSE Arca:	GQI


Fund Summary	1
Natixis Gateway Quality Income ETF	1
Investment Goals, Strategies and Risks	6
More About Goals and Strategies	6
Natixis Gateway Quality Income ETF	6
Differences Between Investing in an ETF and a Mutual Fund	11
More Information About the Fund's Strategies	12
Management Team	12
Meet the Fund's Investment Adviser and Subadviser	12
Meet the Fund's Portfolio Managers	13
Other Service Providers	13
Additional Information	13
Shareholder Information	14
Buying and Selling Shares	14
Investments by Registered Investment Companies	14
Frequent Purchases and Redemptions of Fund Shares	14
Payment to Broker-Dealers and Other Financial Intermediaries	14
Share Prices	15
Net Asset Value	15
Distributions	16
Book Entry	16
Creations and Redemptions	17
Taxation	17
Other Information	19
Premium/Discount Information	19
Continuous Offering	19
Conflicts of Interest	19
Prior Related Performance of Similarly Managed Accounts	20
Financial Performance	21
Appendix A - Additional Index Information	A-1


S&P 500^® Index	A widely recognized measure of U.S. stock market performance. It is an unmanaged index of 500 common stocks chosen for market size, liquidity, and industry group representation, among other factors. It also measures the performance of the large cap segment of the U.S. equities market.


Investment Company Act File No. 811-23146	XGQI51-1223