Strategy. The Social Fixed Income Portfolio seeks to achieve its investment objective through exposure to a broad portfolio of investment grade debt securities (e.g., rated AAA to BBB- by S&P Global Ratings (S&P) or Fitch Ratings Ltd. (Fitch) or Aaa to Baa3 by Moodys Ratings (Moodys)) of U.S. and non-U.S. corporate and government issuers while excluding securities of corporate and certain non-sovereign government issuers based upon the Portfolios social issue screens. Dimensional Fund Advisors LP (the Advisor) expects that the Portfolio will primarily invest in the obligations of issuers that are in developed countries. As a non-fundamental policy, under normal circumstances, at least 80% of the Portfolios net assets will be invested in fixed income securities considered to be investment grade … Show more… The Social Fixed Income Portfolio seeks to achieve its investment objective through exposure to a broad portfolio of investment grade debt securities (e.g., rated AAA to BBB- by S&P Global Ratings (S&P) or Fitch Ratings Ltd. (Fitch) or Aaa to Baa3 by Moodys Ratings (Moodys)) of U.S. and non-U.S. corporate and government issuers while excluding securities of corporate and certain non-sovereign government issuers based upon the Portfolios social issue screens. Dimensional Fund Advisors LP (the Advisor) expects that the Portfolio will primarily invest in the obligations of issuers that are in developed countries. As a non-fundamental policy, under normal circumstances, at least 80% of the Portfolios net assets will be invested in fixed income securities considered to be investment grade quality. The Social Fixed Income Portfolio will be managed with a view to capturing expected credit premiums and expected term premiums. The term expected credit premium means the expected incremental return on investment for holding obligations considered to have greater credit risk than direct obligations of the U.S. Treasury, and expected term premium means the expected incremental return on investment for holding securities having longer-term maturities as compared to shorter-term maturities. In managing the Portfolio, the Advisor will increase or decrease investment exposure to intermediate-term securities depending on the expected term premium and also increase or decrease investment exposure to non-government securities depending on the expected credit premium. The Social Fixed Income Portfolio invests in U.S. and foreign corporate debt securities with an investment grade credit rating and may emphasize such investments in U.S. and foreign corporate debt securities rated A+ to BBB- by S&P or Fitch or A1 to Baa3 by Moodys). The Portfolio will increase or decrease investment exposure to these lower rated debt securities depending on the expected credit premium. The Portfolio will also invest in obligations issued or guaranteed by the U.S. and foreign governments, their agencies and instrumentalities, bank obligations, commercial paper, repurchase agreements, money market funds, obligations of other domestic and foreign issuers having investment grade ratings, securities of domestic or foreign issuers denominated in U.S. dollars but not trading in the United States, and obligations of supranational organizations. The fixed income securities in which the Portfolio invests are considered investment grade at the time of purchase. In addition, the Portfolio is authorized to invest more than 25% of its total assets in U.S. Treasury bonds, bills and notes, and obligations of federal agencies and its instrumentalities. The Social Fixed Income Portfolio primarily invests in securities that mature within twenty years from the date of settlement. Under normal circumstances, the Portfolio will generally maintain a weighted average duration of no more than one quarter year greater than, and no less than one year below, the weighted average duration of the Bloomberg U.S. Aggregate Bond Index, which was approximately 5.98 years as of December 31, 2025. From time to time, the Portfolio may deviate from this duration range when the Advisor determines it to be appropriate under the circumstances. Duration is a measure of the sensitivity of a securitys price to changes in interest rates. The longer a securitys duration, the more sensitive it will be to changes in interest rates. The Social Fixed Income Portfolios investments may include securities denominated in foreign currencies. The Portfolio intends to hedge foreign currency exposure to attempt to protect against uncertainty in the level of future foreign currency rates. The Portfolio may enter into foreign currency forward contracts to hedge against fluctuations in currency exchange rates or to transfer balances from one currency to another. The Portfolio also may enter into credit default swaps on issuers or indices to buy or sell credit protection to hedge its credit exposure; gain market or issuer exposure without owning the underlying securities; or increase the Portfolios total return. The Portfolio also may purchase or sell futures contracts and options on futures contracts, to hedge its currency exposure or to hedge its interest rate exposure or for non-hedging purposes, such as a substitute for direct investment or to increase or decrease market exposure based on actual or expected cash inflows to or outflows from the Portfolio. The Social Fixed Income Portfolio may lend its portfolio securities to generate additional income. The Social Fixed Income Portfolio seeks to purchase securities that are consistent with the Portfolios social issue screens, which are monitored by, or based upon information from, an independent third party. The Portfolio seeks to exclude from its investment portfolio securities of those companies that are identified by the Portfolios social issue screens, as further discussed below. The Portfolios social issue screens are designed to identify companies that: (1) earn at least 10% of their total annual revenue through the production and/or sale of conventional or nuclear weapons, their weapon systems, or key intended components of these products, or the provision of weapon systems support and service related to nuclear weapons, such as the repair and maintenance of nuclear weapons ; (2) have demonstrated complicity in genocide in Sudan, for example, by having ties to the Sudanese military or government, selling or distributing military equipment to a party based in Sudan or operating within Sudan borders, or generating 10% or more of its total assets or revenues in Sudan from the oil, mineral or power sectors; (3) earn at least 10% of their total annual revenue through the production and/or sale of tobacco ( this criteria does not cover products designed as an aid to quit smoking) , alcoholic beverages as an intoxicating agent ( this criteria does not cover packaging such as bottles, cans, corks or caps) , or cannabis products; (4) earn at least 10% of their total annual revenue from the ownership or operation of gambling facilities, licensing their brand name to gambling products, or providing support or services to the gambling industry; (5) directly participate in abortions, or develop or manufacture abortive agents or contraceptives; (6) earn at least 10% of their total annual revenue from the retail, distribution or production of pornographic products (this criteria does not cover companies that offer content sharing platforms that are not pornography focused but allow third-party users to upload pornographic content; (7) are involved in the production of landmines, cluster munitions, or key intended components of such weapons; (8) produce firearms (i.e., using an explosive charge as a propellant) intended for civilian use ; (9) have had involvement in severe child labor controversies (factors that may be considered for determining severity include, but are not limited to, a history of involvement in child labor-related legal cases, widespread or egregious instances of child labor, resistance to improved practices, and criticism by non-governmental organizations and/or other third-party observers) ; (10) conduct stem cell research using cells derived from human embryos or fetal tissue, or use fetal cell lines in the development of vaccines or other biopharmaceuticals; (11) operate or manage, or provide staffing services to, for-profit correctional and/or detention facilities ( this criteria does not cover provision of maintenance or non-management services, including staffing for such services) ; (12) have material involvement in severe environmental, social or governance controversies that indicate operations inconsistent with responsible business conduct standards, such as those defined by the United Nations Global Compact Principles and the Organization for Economic Co-operation and Development Guidelines for Multinational Enterprises; (13) have relatively high carbon intensity or potential emissions from reserves or scaled potential emissions from reserves; and/or (14) have thermal or metallurgical coal reserves. In addition to excluding securities of corporate issuers based upon the Social Fixed Income Portfolios social issue screens, the Portfolio also will generally exclude securities of supranational organizations and certain non-sovereign governmental agencies (both U.S. and non-U.S.) that may be less sustainable as compared to other similar issuers, based upon considerations 13 and 14. The Portfolios investments in securities of U.S. and non-U.S. sovereign issuers are not subject to the other screens identified above. The Advisor, however, considers securities issued by the U.S. Treasury and certain U.S. agencies and instrumentalities that are not subject to the Portfolios social issue screens identified above to be consistent with the Portfolios strategy of investing in social investments. The Social Fixed Income Portfolio may modify this list of social issue screens, at any time, without prior shareholder approval or notice. (See Additional Information on Investment Objectives and PoliciesApplying the Portfolios Social Criteria in this Prospectus.) Show less