Strategy. Principal Investment Strategies The Fund invests primarily in common stocks of large capitalization U.S. companies. The Funds subadviser, Invesco Advisers, Inc. , and sub-subadviser, Invesco Capital Management LLC (together with Invesco Advisers, Inc., Invesco), invest the Funds assets using an indexing strategy. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in the equity securities of companies included within the S&P 500 Momentum Index * (the Index). As of February 28, 2022, the market capitalization range of companies included in the Index was between $8.32 billion and $1.78 trillion. S&P Dow Jones Indices LLC (S&P DJI or the Index Provider) compiles and maintains the Index, which is … Show more… Principal Investment Strategies The Fund invests primarily in common stocks of large capitalization U.S. companies. The Funds subadviser, Invesco Advisers, Inc. , and sub-subadviser, Invesco Capital Management LLC (together with Invesco Advisers, Inc., Invesco), invest the Funds assets using an indexing strategy. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in the equity securities of companies included within the S&P 500 Momentum Index * (the Index). As of February 28, 2022, the market capitalization range of companies included in the Index was between $8.32 billion and $1.78 trillion. S&P Dow Jones Indices LLC (S&P DJI or the Index Provider) compiles and maintains the Index, which is designed to measure the performance of approximately 100 stocks in the S&P 500 Index that have the highest momentum score. In general, momentum is the tendency of an investment to exhibit persistence in its relative performance; a momentum style of investing emphasizes investing in securities that have had better recent performance compared to other securities. The momentum score for each security included in the Index is based on price movements * The S&P 500 Momentum Index is a product of S&P Dow Jones Indices LLC or its affiliates (SPDJI), and has been licensed for use by MassMutual. Standard & Poors and S&P are registered trademarks of Standard & Poors Financial Services LLC (S&P); Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC (Dow Jones); and these trademarks have been licensed for use by SPDJI and sublicensed for certain purposes by MassMutual. The Fund is not sponsored, endorsed, sold or promoted by SPDJI, Dow Jones, S&P, or their respective affiliates, and none of such parties make any representation regarding the advisability of investing in such product(s) nor do they have any liability for any errors, omissions, or interruptions of the S&P 500 Momentum Index. ? and volatility of the security as compared to other eligible securities within the S&P 500 Index. In selecting constituent securities for the Index, the Index Provider first calculates the momentum score of each stock in the S&P 500 Index by evaluating the percentage change in the stocks price over the last 12 months, excluding the most recent month, and applying an adjustment based on the securitys volatility over that period. (Volatility is a statistical measurement of the magnitude of up and down asset price fluctuations (increases or decreases in a stocks price) over time.) The Index Provider then selects approximately 100 stocks with the highest momentum score for inclusion in the Index. The Index uses a modified market capitalization-weighted strategy, as the Index Provider weights securities by multiplying their market capitalization and their momentum scores, subject to security and sector constraints. The maximum weight of each component is capped at the lower of 9% or three times its market capitalization weight in the S&P 500 Index. The Index is rebalanced semi-annually after market close on the third Friday in March and September. New constituents generally will only be added to the Index during a semi-annual rebalance. Stocks that are removed from the S&P 500 Index will be removed from the Index simultaneously. The Fund is rebalanced in accordance with the Index, meaning that it will buy and sell securities in response to changes in the Index. Although the Fund generally will invest in substantially all of the securities comprising the Index in proportion to their weightings in the Index, under various circumstances it may not be possible or practicable to purchase all of those securities in those same weightings. In those circumstances, the Fund may hold cash or purchase a sample of the securities in the Index. When it relies on a sampling methodology, Invesco uses quantitative analysis to select securities from the Index universe to obtain a representative sample of securities that has, overall, investment characteristics similar to the Index in terms of key risk factors, performance attributes, and other characteristics such as industry weightings, market capitalization, return variability, earnings valuation, yield, and other financial characteristics of securities. When employing a sampling methodology, Invesco bases the number of the holdings in the Fund on a number of factors, including asset size of the Fund, and generally expects the Fund to hold fewer than the total number of securities in the Index. However, Invesco reserves the right to invest in as many securities as it believes necessary to achieve the Funds investment objective. The Fund may use futures contracts, a type of derivative, to seek performance that corresponds to the Index and/or to manage cash flows. Use of futures contracts by the Fund may create investment leverage. The Index, and therefore the Fund, may at times have significant exposure to one or more industries or sectors. The Fund is non-diversified, which means that it may hold larger positions in a smaller number of issuers than a diversified fund. Changes in the Index, or use of the sampling methodology described above, may result in active and frequent trading by the Fund and as a result the Fund may have a relatively high portfolio turnover rate. Show less