Strategy. The Fund is diversified and seeks to track the investment results of the ICE BofA BB US Cash Pay High Yield Constrained Index (the Index), which contains all bonds in the ICE BofA US Cash Pay High Yield Index (the Underlying Index) that are rated BB1 though BB3, based on an average of Moodys Investors Services, Inc. (Moodys), S&P Global Ratings (S&P) and Fitch Ratings, Inc. (Fitch), but caps issuer exposure at 2%. Index constituents are capitalization-weighted, based on their current amount outstanding, provided the total allocation to an individual issuer does not exceed 2%. Issuers that exceed the limit are reduced to 2% and the face value of each of their bonds is adjusted on a pro-rata basis. Similarly, … Show more… The Fund is diversified and seeks to track the investment results of the ICE BofA BB US Cash Pay High Yield Constrained Index (the Index), which contains all bonds in the ICE BofA US Cash Pay High Yield Index (the Underlying Index) that are rated BB1 though BB3, based on an average of Moodys Investors Services, Inc. (Moodys), S&P Global Ratings (S&P) and Fitch Ratings, Inc. (Fitch), but caps issuer exposure at 2%. Index constituents are capitalization-weighted, based on their current amount outstanding, provided the total allocation to an individual issuer does not exceed 2%. Issuers that exceed the limit are reduced to 2% and the face value of each of their bonds is adjusted on a pro-rata basis. Similarly, the face values of bonds of all other issuers that fall below the 2% cap are increased on a pro-rata basis. In the event there are fewer than 50 issuers in the Index, each is equally weighted and the face values of their respective bonds are increased or decreased on a pro-rata basis. See More Information About the FundsIndex Construction for more information about the adjustment formula. There is no limit to the number of issues in the Index, but as of December 31, 2025, the Index included approximately 1,066 constituents. The bonds included in the Index are publicly issued in the United States domestic market. Because the Index is reconstituted and rebalanced monthly, the components of the Index are likely to change over time. As of December 31, 2025, the bonds eligible for inclusion in the Index include U.S. dollar-denominated high yield corporate bonds, currently in a coupon paying period, that are publicly issued in the U.S. domestic market, and that: (i) are issued by companies having risk exposure to countries ( i.e., issuers that are subject to the risks of one or more of these countries as a result of the principal country of domicile of the issuers (as determined by ICE Data Indices, LLC or its affiliates, collectively Index Provider or IDI)) that are members of the FX-G10, which include Australia, Austria, Belgium, Canada, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Japan, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, New Zealand, Norway, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, the U.K. and the U.S. and their respective territories; (ii) have an average rating of below investment grade (ratings from Fitch, Moodys or S&P are considered; if more than one agency provides a rating, the Index Provider assigns a numeric equivalent to the available ratings from Fitch, Moodys or S&P, calculates the average rating of the numeric equivalents and that average rating is then attached to the bond); (iii) are registered with the SEC, exempt from registration at issuance, or offered pursuant to Rule 144A under the Securities Act of 1933, as amended (the 1933 Act), with or without registration rights; (iv) have at least $250 million of outstanding face value; (v) have an original maturity date of at least 18 months at the time of issuance; and (vi) have at least one year to maturity as of the rebalancing date. There is no upper limit on the maturity of bonds eligible for inclusion in the Index. For more information regarding the Underlying Index, see More Information About the FundsUnderlying Index below. BIM uses a passive or indexing approach to try to achieve the Funds investment objective. Unlike many investment companies, the Fund does not try to outperform the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued. Indexing will eliminate the chance that the Fund will substantially outperform the 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. BIM 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 that collectively has an investment profile similar to that of an applicable target index that BIM determines to collectively have an investment profile similar to that of the Index. The securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and sector weightings), fundamental characteristics (such as return variability, duration, maturity, credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the securities in the Index. There may be instances in which BIM may choose to underweight or overweight a security in the Index and/or purchase securities not in the Index that BIM believes are appropriate to substitute for certain securities in the Index in seeking to replicate as closely as possible, before fees and expenses, the performance of the Index. The Fund may sell securities that are represented in the Index in anticipation of their removal from the Index or purchase securities not represented in the Index in anticipation of their addition to the Index. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in high-yield, below-investment grade bonds (sometimes called junk bonds) rated BB (or its equivalent) denominated in U.S. dollars of corporate issuers, either directly or indirectly (e.g., through derivatives). The Fund may also invest up to 20% of its net assets in certain futures, options and swap contracts, U.S. Treasury obligations, U.S. government obligations, U.S. agency securities, securities of other registered investment companies, cash and cash equivalents, as well as in securities not included in its Index, but which BIM believes will help the Fund track its Index. The Fund seeks to track the investment results of the Index before fees and expenses of the Fund. The Index is sponsored by the Index Provider, which is independent of the Fund and BIM. The Index Provider determines the composition and relative weightings of the bonds in the Index and publishes information regarding the market value of the 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 Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities), repurchase agreements collateralized by U.S. government securities, and tax-exempt securities of state or municipal governments and their political subdivisions are not considered to be issued by members of any industry. As of December 31, 2025, the Fund is not concentrated in any industry. Show less