Strategy. The Fund seeks to track the total return of the securities composing the S&P MidCap 400 Index (the Index), taking into consideration redemptions, sales of additional shares, and other adjustments described below. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in investments with economic characteristics similar to midcap stocks as represented in the Index. The Index is an unmanaged index comprising common stocks of 400 mid-sized U.S. companies. As of December 31, 2024, the market capitalization of the Index companies ranged from $2.3 billion to $22.9 billion with a weighted average market capitalization of $9.7 billion. Market capitalizations of companies within the S&P MidCap 400 Index are subject … Show more… The Fund seeks to track the total return of the securities composing the S&P MidCap 400 Index (the Index), taking into consideration redemptions, sales of additional shares, and other adjustments described below. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in investments with economic characteristics similar to midcap stocks as represented in the Index. The Index is an unmanaged index comprising common stocks of 400 mid-sized U.S. companies. As of December 31, 2024, the market capitalization of the Index companies ranged from $2.3 billion to $22.9 billion with a weighted average market capitalization of $9.7 billion. Market capitalizations of companies within the S&P MidCap 400 Index are subject to change. The Index is capitalization-weighted, meaning that companies with larger market capitalizations will contribute more to the Indexs value than companies with smaller market capitalizations. Changes to the Index are made on a quarterly or an as-needed basis. There is no annual or semi-annual reconstitution and changes in response to corporate actions and market developments can be made at any time. The Fund mirrors the Indexs rebalancing process. The Fund is not sponsored, endorsed, sold or promoted by the S&P Dow Jones Indices LLC, a division of S&P Global. The Fund will invest primarily in common stocks of the companies that compose the Index. The Fund uses a replication index method, investing in the common stock of each company in the Index in approximately the same proportion as represented in the Index itself. The Fund intends to concentrate its investments only to the extent that the Index does. While not required, the Fund will generally sell securities that the Index provider removes from the Index. At times the Fund's investments may be focused in one or more sectors. The Fund may also invest in exchange-traded funds (ETFs) that provide exposure to the Index. Derivatives, such as options, futures, and options on such futures that provide exposure to the stocks in the Index may be held by the Fund incidental to its main investment strategy in order to manage cash balances, to maintain liquidity to meet shareholder redemptions, or minimize trading costs. The Fund may also lend its securities. Show less