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UNITED STATES COMMODITY INDEX FUNDS TRUST

UNITED STATES COPPER INDEX FUND

STATEMENT OF ADDITIONAL INFORMATION

May 1, 2014

Before you decide whether to invest, you should read this entire prospectus carefully and consider the risk factors beginning on page 5.

The date of this statement of additional information is May 1, 2014. It is the second part of a two part document, the Prospectus, and should be read in conjunction with the disclosure document dated May 1, 2014 which is the first part of the Prospectus.

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TABLE OF CONTENTS FOR THE STATEMENT OF ADDITIONAL INFORMATION

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Additional Information About the SCITR

The overall return on the SCITR is generated by two components: (i) uncollateralized returns from the Benchmark Component Copper Futures Contracts comprising the SCITR, and (ii) a daily fixed income return reflecting the interest earned on hypothetical 3-month Treasuries, calculated using the weekly auction rate for 3-Month Treasuries published by the U.S. Department of the Treasury. SummerHaven Indexing is the owner of the SCITR.

Table 1 below lists the Futures Exchange on which the Eligible Copper Futures Contracts are listed and quotation details. Table 2 lists the Eligible Copper Futures Contracts, their sector designation and maximum allowable tenor.

TABLE 1

TABLE 2

Prior to the end of each month, SummerHaven Indexing determines the composition of the SCITR and provides such information to the NYSE Arca. Values of the SCITR are computed by the NYSE Arca and disseminated approximately every fifteen (15) seconds from 8:00 a.m. to 5:00 p.m., New York City time, which also publishes a daily SCITR value at approximately 5:30 p.m., New York City time, under the index ticker symbol “SCITR”. Only settlement and last-sale prices are used in the SCITR’s calculation, bids and offers are not recognized — including limit-bid and limit-offer price quotes. Where no last-sale price exists, typically in the more deferred contract months, the previous days’ settlement price is used. This means that the underlying SCITR may lag its theoretical value. This tendency to lag is evident at the end of the day when the SCITR value is based on the settlement prices of the Benchmark Component Copper Futures Contracts, and explains why the underlying SCITR often closes at or near the high or low for the day.

Composition of the SCITR

The composition of the SCITR on any given day, as determined and published by SummerHaven Indexing, is determinative of the benchmark for CPER. Neither the index methodology for the SCITR nor any set of procedures, however, are capable of anticipating all possible circumstances and events that may occur with respect to the SCITR and the methodology for its composition, weighting and calculation. Accordingly, a number of subjective judgments must be made in connection with the operation of the SCITR that cannot be adequately reflected in this description of the SCITR. All questions of interpretation with respect to the application of the provisions of the index methodology for the SCITR, including any determinations that need to be made in the event of a market emergency or other extraordinary circumstances, will be resolved by SummerHaven Indexing.

Contract Expirations

Because the SCITR is comprised of actively traded contracts with scheduled expirations, it can be calculated only by reference to the prices of contracts for specified expiration, delivery or settlement periods, referred to as contract expirations. The contract expirations included in the SCITR for each commodity during a given year are designated by SummerHaven Indexing, provided that each contract must be an active contract. An active contract for this purpose is a liquid, actively-traded contract expiration, as defined or identified by the relevant trading

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facility or, if no such definition or identification is provided by the relevant trading facility, as defined by standard custom and practice in the industry.

If a futures exchange, such as the COMEX, ceases trading in all contract expirations relating to an Eligible Copper Futures Contract, SummerHaven Indexing may designate a replacement contract. The replacement contract must satisfy the eligibility criteria for inclusion in the SCITR. To the extent practicable, the replacement will be effected during the next monthly review of the composition of the SCITR. If that timing is not practicable, SummerHaven Indexing will determine the date of the replacement based on a number of factors, including the differences between the existing Benchmark Component Copper Futures Contract and the replacement contract with respect to contractual specifications and contract expirations.

The designation of a replacement contract could affect the value of the SCITR, either positively or negatively, depending on the price of the contract that is eliminated and the prices of the replacement contract. It is impossible, however, to predict the effect of these changes, if they occur, on the value of the SCITR.

Contract Selection and Weighting

Weights for each of the Benchmark Component Copper Futures Contracts are determined for the next month. The methodology used to calculate the SCITR weighting is based solely on quantitative data using observable futures prices and is not subject to human bias.

The monthly weighting selection is a process based upon examination of the relevant futures prices for copper:

1) On CPER’s Selection Date (“CPER’s Selection Date”):

A futures curve in backwardation occurs when the price of the closest-to-expiration contract is greater than or equal to the price of the third closest-to-expiration contract. These contracts will have expirations that are approximately two months apart. A curve not in backwardation is defined as being in contango, which occurs when the price of the closest-to-expiration contract is less than the price of the third closest-to-expiration contract.

2a) Backwardation: If the copper futures curve is in backwardation on the Selection Date, the SCITR takes positions in the two Eligible Copper Futures Contracts with the highest annualized percentage price difference, each weighted at 50%.

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A hypothetical example is included below, with the two selected Eligible Copper Futures Contracts shaded below (the selected commodities are ranked 1 and 2):

2b) Contango: If the copper futures curve is in contango, then the SCITR takes positions in three Eligible Copper Futures Contracts, as follows: first, the SCITR takes positions in the two Eligible Copper Futures Contracts with the highest annualized percentage price difference, each weighted at 25%; then, the SCITR also takes a position in the closest-to-expiration December Eligible Future Contract that has expiration more distant than the fourth of the Next Four Eligible Copper Futures Contracts for the applicable month, which position is weighted at 50%.

A hypothetical example is included below, with the next two selected Eligible Copper Futures Contracts shaded below (the selected commodities are ranked 1 – 2):

Due to the dynamic monthly weighting calculation, the individual weights will vary-over time, depending on the price observations each month. CPER’s Selection Date for the SCITR is the last business day of the calendar month.

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The following graph shows the weights of the Benchmark Component Copper Futures Contracts selected for inclusion in the SCITR as of December 31, 2013.

Portfolio Construction

The portfolio rebalancing takes place during the Rebalancing Period. At the end of each of the days in the Rebalancing Period one fourth of the prior month portfolio positions are replaced by the new weights for the Benchmark Component Copper Futures Contracts determined on CPER’s Selection Date.

SCITR Total Return Calculation

The value of the SCITR on any business day is equal to the product of (i) the value of the SCITR on the immediately preceding business day multiplied by (ii) one plus the sum of the day’s returns for another version of the SCITR known as the SummerHaven Dynamic Copper Index Excess Return (“SCI ER”) (explained below) and one business day’s interest from the hypothetical Treasury Bill portfolio. The value of the SCITR will be calculated and published by the NYSE Arca.

SCITR Base Level

The SCITR was set to 100 on January 2, 1991.

SCI ER Calculation

The total return of the SCI ER reflects the percentage change of the market values of the underlying commodity futures. During the Rebalancing Period, the SCITR changes its contract holdings and weightings during a four day period. The value of the SCI ER at the end of a business day “t” is equal to the SCI ER value on day “t -1” multiplied by the sum of the daily percentage price changes of each commodity future factoring in each respective commodity future’s notional holding on day “t -1”.

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