Strategy. Under normal circumstances, the Fund invests at least 80% of the sum of its net assets and the amount of any borrowings for investment purposes in equity securities of mid-capitalization value companies. The Fund will invest primarily in equity securities of medium-sized domestic companies, as defined by the Funds benchmark index, the Russell Midcap Value Index, that the Funds investment adviser, Teachers Advisors, LLC (Advisors), believes appear undervalued by the market based on an evaluation of their potential worth. Mid-capitalization companies are those that have market capitalizations within the range of the companies in the Russell Midcap Index. The market capitalization range is determined based on the companies in the index as of the last business day of the month … Show more… Under normal circumstances, the Fund invests at least 80% of the sum of its net assets and the amount of any borrowings for investment purposes in equity securities of mid-capitalization value companies. The Fund will invest primarily in equity securities of medium-sized domestic companies, as defined by the Funds benchmark index, the Russell Midcap Value Index, that the Funds investment adviser, Teachers Advisors, LLC (Advisors), believes appear undervalued by the market based on an evaluation of their potential worth. Mid-capitalization companies are those that have market capitalizations within the range of the companies in the Russell Midcap Index. The market capitalization range is determined based on the companies in the index as of the last business day of the month in which the index was most recently reconstituted and may be updated to reflect any changes to the index composition and the market capitalization of companies in the index. Value companies are those that are constituents of at least one of the following indexes on the last business day of the month in which its most recent reconstitution was completed (as adjusted by changes to an index between reconstitutions): Russell 3000 Value Index, S&P Composite 1500 Value Index, MSCI World IMI Value Index. Advisors uses a variety of comparative valuation criteria to determine whether shares of a particular company might be undervalued, including analyses of historical valuations of the same security; valuations of comparable securities in the same sector or the overall market; various financial ratios such as stock price-to-earnings, stock price-to-book value, free cash flow, debt-to-capital and, to a lesser extent, dividend yield. The Fund may invest up to 20% of its assets in foreign investments. The Fund may also purchase and sell futures, options, swaps and other equity derivatives to carry out the Funds investment strategies. Show less