Strategy. The Fund seeks to track the investment results of the MSCI USA Momentum SR Variant Index (the Underlying Index ), which consists of stocks exhibiting relatively higher momentum characteristics than the traditional market capitalization-weighted parent index, the MSCI USA Index (the Parent Index ), as determined by MSCI Inc. (the Index Provider or MSCI ). The Parent Index includes U.S. large- and mid-capitalization stocks, as defined by MSCI. The Underlying Index is designed to measure the performance of an equity momentum strategy by emphasizing stocks with high price momentum, while maintaining reasonably high trading liquidity, investment capacity and moderate index turnover, each as determined by the Index Provider. MSCI uses an algorithm to determine the components in the Underlying Index … Show more… The Fund seeks to track the investment results of the MSCI USA Momentum SR Variant Index (the Underlying Index ), which consists of stocks exhibiting relatively higher momentum characteristics than the traditional market capitalization-weighted parent index, the MSCI USA Index (the Parent Index ), as determined by MSCI Inc. (the Index Provider or MSCI ). The Parent Index includes U.S. large- and mid-capitalization stocks, as defined by MSCI. The Underlying Index is designed to measure the performance of an equity momentum strategy by emphasizing stocks with high price momentum, while maintaining reasonably high trading liquidity, investment capacity and moderate index turnover, each as determined by the Index Provider. MSCI uses an algorithm to determine the components in the Underlying Index based on the number of constituents in the Parent Index. A risk-adjusted price momentum metric, defined by MSCI as the excess return over the risk-free rate ( i.e. , the 3 Month Treasury Bill Rate) divided by the annualized standard deviation of weekly returns over the past three years, is calculated for each security in the Parent Index over 6- and 12-month time periods. The 6- and 12-month risk-adjusted price momentum calculations are then standardized at +/- 3 standard deviations and translated into an average momentum score. MSCI selects the 125 securities with the highest positive momentum scores for inclusion in the Underlying Index. The weight of each Underlying Index constituent is determined by multiplying the securitys momentum score by its market capitalization weight in the Parent Index. Additionally, a capping methodology is applied so that each individual issuer is capped at 5% weight at reconstitution. The Index Provider also takes into account certain diversification rules. At reconstitution, if the aggregate weight of stocks representing more than 4.5% weight is greater than 22.5% of the Underlying Index weight, the Underlying Index is rebalanced such that the aggregate weight of stocks greater than 4.5% does not exceed 22.5% of the Underlying Index weight. Between reconstitution dates, if the aggregate weight of stocks representing more than 5% weight is greater than 25% of the Underlying Index weight, the Underlying Index is rebalanced such that the aggregate weight of stocks greater than 4.5% does not exceed 22.5% of the Underlying Index weight. The Underlying Index is reconstituted quarterly. To determine the constituent changes at each quarterly reconstitution, the Index Provider applies an iterative algorithm to cap the one-way turnover per reconstitution at 30%. As of July 31, 2025, there were 125 securities in the Underlying Index. As of July 31, 2025, a significant portion of the Underlying Index is represented by securities of companies in the consumer goods and services, financials and technology industries or sectors. The components of the Underlying Index are likely to change over time. BFA uses an indexing approach to try to achieve the Funds investment objective. The Fund does not try to beat the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued. Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection. Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies. BFA uses a representative sampling indexing strategy to manage the Fund. Representative sampling is an indexing strategy that involves investing in a representative sample of securities or other instruments that collectively has an investment profile similar to that of an applicable underlying index. The instruments selected are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the components of the Underlying Index. The Fund generally will invest at least 80% of its assets in the component securities of its Underlying Index and may invest up to 20% of its assets in certain futures, options and swap contracts, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates, as well as in securities not included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. Cash and cash equivalent investments associated with a derivative position will be treated as part of that position for the purposes of calculating the percentage of investments included in the Underlying Index. The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of any collateral received). The Underlying Index and Parent Index are sponsored by MSCI, which is ? independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index ? and Parent Index and publishes information regarding the market value of the Underlying Index ? and Parent Index. Industry Concentration Policy. The Fund will concentrate its investments ( i.e. , hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities) and repurchase agreements collateralized by U.S. government securities are not considered to be issued by members of any industry. Show less