# EDGAR Filing Document

**Accession Number:** 0000355437
**File Stem:** 0000355437-26-000156
**Filing Date:** 2026-2
**Character Count:** 30174
**Document Hash:** 3bf4b806653192cd30247185c6801a19
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000355437-26-000156.hdr.sgml**: 20260227

**ACCESSION NUMBER**: 0000355437-26-000156

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260227

**DATE AS OF CHANGE**: 20260227

**EFFECTIVENESS DATE**: 20260227

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DFA INVESTMENT DIMENSIONS GROUP INC
- **CENTRAL INDEX KEY:** 0000355437

**ORGANIZATION NAME:**
- **EIN:** 363129984
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-73948
- **FILM NUMBER:** 26698471

**BUSINESS ADDRESS:**
- **STREET 1:** 6300 BEE CAVE ROAD
- **STREET 2:** BUILDING ONE
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78746
- **BUSINESS PHONE:** (512) 306-7400

**MAIL ADDRESS:**
- **STREET 1:** 6300 BEE CAVE ROAD
- **STREET 2:** BUILDING ONE
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78746

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DFA SMALL CO FUND INC
- **DATE OF NAME CHANGE:** 19830621

## Series and Classes Contracts Data

### DFA Social Fixed Income Portfolio (Series ID: S000053205)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000167354 | Institutional Class |  |

![](img_f607b3495f6f4f1.jpg)<br>

## DFA Social Fixed Income Portfolio
**SHARE CLASS (TICKER)**: INSTITUTIONAL CLASS (DSFIX)<br>

#### Summary Prospectus
February 28, 2026

Before you invest, you may want to review the Portfolio's Prospectus, which contains more information about the Portfolio and its risks. You can find the Portfolio's Prospectus and other information about the Portfolio, including the Statement of Additional Information (SAI) and most recent reports to shareholders, when available, online at https://www.dimensional.com/us-en/document-center. You can also get this information at no cost by calling collect to (512) 306-7400 or by sending an e-mail request to document_requests@dimensional.com. The Portfolio's Prospectus and SAI, both dated February 28, 2026, as may be supplemented, are incorporated by reference into this Summary Prospectus.<br>

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Investment Objective

The investment objective of the DFA Social Fixed Income Portfolio (the "Social Fixed Income Portfolio" or the "Portfolio") is to seek to maximize total returns. Total return is comprised of income and capital appreciation.

Fees and Expenses of the Portfolio

**This table describes the fees and expenses you may pay if you buy, hold or sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.**

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| | |
|:---|:---|
| **Shareholder Fees (fees paid directly from your investment): None** |  |
| **Annual Fund Operating Expenses (expenses that you pay each <br>year as a percentage of the value of your investment)** |  |
| Management Fee | **0.18%** |
| Other Expenses | **0.04%** |
| Total Annual Fund Operating Expenses | **0.22%** |

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#### EXAMPLE
This Example is meant to help you compare the cost of investing in the Portfolio with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs whether you redeem or hold your shares would be:

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| | | | |
|:---|:---|:---|:---|
| **1 Year** | **3 Years** | **5 Years** | **10 Years** |
| $23  | $71  | $124  | $280  |

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#### PORTFOLIO TURNOVER
A fund generally pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Portfolio's performance. During the most

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recent fiscal year, the Portfolio's portfolio turnover rate was 30% of the average value of its investment portfolio.

Principal Investment Strategies

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 Moody's Ratings ("Moody's")) 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 Portfolio's 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 Portfolio's 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 Moody's). 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

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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 security's price to changes in interest rates. The longer a security's duration, the more sensitive it will be to changes in interest rates.

The Social Fixed Income Portfolio's 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 Portfolio's 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 Portfolio's 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 Portfolio's social issue screens, as further discussed below. The Portfolio's 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

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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 Portfolio's 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 Portfolio's 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 Portfolio's social issue screens identified above to be consistent with the Portfolio's 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 Policies—Applying the Portfolios' Social Criteria"** in this Prospectus.)

Principal Risks

Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money. An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following is a description of principal risks of investing in the Portfolio.

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***Market Risk:*** Even a long-term investment approach cannot guarantee a profit. Economic, market, environmental, political, and issuer-specific conditions and events will cause the value of securities, and a fund that owns them, to rise or fall.

***Social Investment Risk:*** A fund with social issue screens may limit the number of investment opportunities available to the fund, and as a result, at times the Portfolio may underperform funds that are not subject to such special investment conditions. For example, a fund with social issue screens may decline to purchase certain securities when it is otherwise advantageous to do so, or may sell certain securities for social reasons when it is otherwise disadvantageous to do so. There is no guarantee that a fund's investments will reflect the social considerations of any particular investor.

***Interest Rate Risk:*** Fixed income securities are subject to interest rate risk because the prices of fixed income securities tend to move in the opposite direction of interest rates. When interest rates rise, fixed income security prices fall. During periods of very low or negative interest rates, a fund may be subject to a greater risk of rising interest rates. When interest rates fall, fixed income security prices rise. In general, fixed income securities with longer maturities are more sensitive to changes in interest rates.

***Credit Risk:*** Credit risk is the risk that the issuer of a security may be unable to make interest payments and/or repay principal when due. A downgrade to an issuer's credit rating or a perceived change in an issuer's financial strength may affect a security's value, and thus, impact the performance of a fund holding such securities. Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. Government that are supported by the full faith and credit of the United States, such as the Federal Housing Administration and Ginnie Mae, present little credit risk. Other securities issued by agencies and instrumentalities sponsored by the U.S. Government, that are supported only by the issuer's right to borrow from the U.S. Treasury, subject to certain limitations, and securities issued by agencies and instrumentalities sponsored by the U.S. Government that are sponsored by the credit of the issuing agencies, such as Freddie Mac and Fannie Mae, are subject to a greater degree of credit risk. U.S. government agency securities issued or guaranteed by the credit of the agency may still involve a risk of non-payment of principal and/or interest.

***Income Risk:*** Income risk is the risk that falling interest rates will cause a fund's income to decline because, among other reasons, the proceeds from maturing short-term securities in its portfolio may be reinvested in lower-yielding securities.

***Call Risk****:* Call risk is the risk that during periods of falling interest rates, an issuer will call or repay a higher-yielding fixed income security before its maturity date, forcing a fund to reinvest in fixed income securities with lower interest rates than the original obligations.

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***Foreign Securities and Currencies Risk:*** Foreign securities prices may decline or fluctuate because of: (a) economic or political actions of foreign governments, and/or (b) less regulated or liquid securities markets. Investors holding these securities may also be exposed to foreign currency risk (the possibility that foreign currency will fluctuate in value against the U.S. dollar or that a foreign government will convert, or be forced to convert, its currency to another currency, changing its value against the U.S. dollar). The Portfolio hedges foreign currency risk.

Foreign issuers may not be subject to uniform accounting, auditing and financial reporting standards and there may be less reliable and publicly available financial and other information about such issuers, as compared to U.S. issuers. A fund may have greater difficulty voting proxies, exercising shareholder rights, securing dividends and/or interest and obtaining information regarding corporate actions on a timely basis, pursuing legal remedies, and obtaining judgments with respect to foreign investments in foreign courts than with respect to domestic issuers in U.S. courts.

***Foreign Government Debt Risk****:* The risk that: (a) the governmental entity that controls the repayment of government debt may not be willing or able to repay the principal and/or to pay the interest when it becomes due, due to factors such as political considerations, the relative size of the governmental entity's debt position in relation to the economy, cash flow problems, insufficient foreign currency reserves, the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies, and/or other national economic factors; (b) governments may default on their debt securities, which may require holders of such securities to participate in debt rescheduling; and (c) there is no legal or bankruptcy process by which defaulted government debt may be collected in whole or in part.

***Derivatives Risk:*** Derivatives are instruments, such as futures contracts, and options thereon, and foreign currency forward contracts, whose value is derived from that of other assets, rates or indices. Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non-hedging purposes. Hedging with derivatives may increase expenses, and there is no guarantee that a hedging strategy will work. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains or cause losses if the market moves in a manner different from that anticipated by a fund or if the cost of the derivative outweighs the benefit of the hedge. In regard to currency hedging, it is generally not possible to precisely match the foreign currency exposure of such foreign currency forward contracts to the value of the securities involved due to fluctuations in the market values of such securities and cash flows into and out of a fund between the date a foreign currency forward contract is entered into and the date it expires. The use of derivatives for non-hedging purposes may be considered to carry more risk than other types of investments. When a fund uses derivatives, the fund will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks including counterparty, settlement, liquidity, interest rate, market, credit and management risks, as well as difficulties with respect to valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and a fund could lose more than the principal amount invested.

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Additional risks are associated with the use of swaps including counterparty and credit risk (the risk that the other party to a swap agreement will not fulfill its contractual obligations, whether because of bankruptcy or other default) and liquidity risk (the possible lack of a secondary market for the swap agreement). Credit risk increases when a fund is the seller of swaps and counterparty risk increases when the fund is a buyer of swaps. In addition, where a fund is the seller of swaps, it may be required to liquidate portfolio securities at inopportune times in order to meet payment obligations. Swaps may be illiquid or difficult to value.

***Liquidity Risk:*** Liquidity risk exists when particular portfolio investments are difficult to purchase or sell. To the extent that a fund holds illiquid investments, the fund's performance may be reduced due to an inability to sell the investments at opportune prices or times. Liquid portfolio investments may become illiquid or less liquid after purchase by a fund due to low trading volume, adverse investor perceptions, credit tightening and/or other market developments. Liquidity risk includes the risk that a fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss or at increased costs. Liquidity risk can be more pronounced in periods of market turmoil or in situations where ownership of shares of a fund are concentrated in one or a few investors. Investments that are illiquid or that trade in lower volumes may be more difficult to value.

***Securities Lending Risk:*** Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, a fund may lose money and there may be a delay in recovering the loaned securities. A fund could also lose money if it does not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral. Securities lending also may have certain adverse tax consequences.

***Operational Risk:*** Operational risks include human error, changes in personnel, system changes, faults in communication, and failures in systems, technology, or processes, and the use of artificial intelligence and machine learning ("AI"). Various operational events or circumstances are outside a fund's or its advisor's control, including instances at third parties. A fund and its advisor seek to reduce these operational risks through controls and procedures. However, measures that seek to reduce these operational risks through controls and procedures may not address every possible risk and may be inadequate to address these risks.

***Cyber Security Risk:*** A fund and its service providers' use of internet, technology and information systems may expose the fund to potential risks linked to cyber security breaches of those technological or information systems. Cyber security breaches, amongst other things, could allow an unauthorized party to gain access to proprietary information, customer data, or fund assets, or cause the fund and/or its service providers to suffer data corruption or lose operational functionality.

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Performance

The bar chart and table immediately following illustrate the variability of the Portfolio's returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the Portfolio's performance from year to year. The table illustrates how annualized returns for certain periods, both before and after taxes, compare with those of a broad measure of market performance. The Portfolio's past performance (before and after taxes) is not an indication of future results. Updated performance information for the Portfolio can be obtained by visiting https://www.dimensional.com/us-en/funds.

The after-tax returns presented in the table for the Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown in the table. In addition, the after-tax returns shown are not relevant to investors who hold shares of the Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.

**DFA Social Fixed Income Portfolio Institutional Class Shares —Total Returns**<br>

![PerformanceBarChartData(2017:3.35, 2018:-0.32, 2019:9.83, 2020:9.26, 2021:-2.19, 2022:-13.07, 2023:7.18, 2024:1.81, 2025:7.07)](img_94d254d0d7424f1.jpg)

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| | |
|:---|:---|
| **<u>January 2017-December 2025</u>** | **<u>January 2017-December 2025</u>** |
| Highest Quarter | Lowest Quarter |
| 6.63% 2023, Q4 | -6.38% 2022, Q1 |

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| | | | | |
|:---|:---|:---|:---|:---|
| **Annualized Returns (%) <br>Periods ended December 31, 2025** | **Annualized Returns (%) <br>Periods ended December 31, 2025** |  |  |  |
|  |  |  |  | **Since** |
|  |  | **1 Year** | **5 Years** | **Inception** |
| **DFA Social Fixed Income Portfolio** | **DFA Social Fixed Income Portfolio** |  |  |  |
|  | Return Before Taxes | **7.07%** | **-0.13%** | **1.93%**<br>**<sup>1</sup>** |
|  | Return After Taxes on Distributions | **5.40%** | **-1.42%** | **0.82%**<br>**<sup>1</sup>** |
|  | Return After Taxes on Distributions and Sale of Portfolio Shares | **4.17%** | **-0.64%** | **1.00%**<br>**<sup>1</sup>** |
| **Bloomberg U.S. Aggregate Bond Index** | **Bloomberg U.S. Aggregate Bond Index** |  |  |  |
| (reflects no deduction for fees, expenses or taxes on sales) | (reflects no deduction for fees, expenses or taxes on sales) | **7.30%** | **-0.36%** | **1.72%**<br>**<sup>1</sup>** |
| <sup>1.</sup> | Since inception April 5, 2016. | Since inception April 5, 2016. | Since inception April 5, 2016. | Since inception April 5, 2016. |

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Investment Advisor/Portfolio Management

Dimensional Fund Advisors LP serves as the investment advisor for the Portfolio. Dimensional Fund Advisors Ltd. and DFA Australia Limited serve as the sub-advisors for the Portfolio. The following individuals are responsible for leading the day-to-day management of the Portfolio:

• **Joseph F. Kolerich**, Head of Fixed Income, Americas, member of the Investment Committee, Vice President, and Senior Portfolio Manager of the Advisor, has been a portfolio manager of the Portfolio since inception (2016).

• **David A. Plecha,** Global Head of Fixed Income Portfolio Management, member of the Investment Committee, Vice President, and Senior Portfolio Manager of the Advisor, has been a portfolio manager of the Portfolio since inception (2016).

• **Lacey N. Huebel**, Vice President and Senior Portfolio Manager of the Advisor, has been a portfolio manager of the Portfolio since 2024.

Purchase and Redemption of Fund Shares

Investors may purchase or redeem shares of the Portfolio on each day that the New York Stock Exchange is scheduled to be open for business by first contacting the Portfolio's transfer agent at (888) 576-1167. Shareholders that invest in the Portfolio through a financial intermediary should contact their financial intermediary regarding purchase and redemption procedures. The Portfolio generally is available for investment only by institutional clients, clients of registered investment advisors, clients of financial institutions and a limited number of certain other investors as approved from time to time by the Advisor. All investments are subject to approval of the Advisor.

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Tax Information

The dividends and distributions you receive from the Portfolio are taxable and generally will be taxed as ordinary income, capital gains, or some combination of both, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or an individual retirement account, in which case distributions may be taxed as ordinary income when withdrawn from the plan or account.

Payments to Financial Intermediaries

If you purchase the Portfolio through a broker-dealer or other financial intermediary (such as a bank), the Portfolio and its related companies may pay the intermediary for the sale of the Portfolio shares and/or related services. These payments may create a conflict of interest by influencing the financial intermediary to recommend the Portfolio over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

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| | |
|:---|:---|
| **Dimensional Fund Advisors LP<br>6300 Bee Cave Road, Building One <br>Austin, TX 78746 <br>(512) 306-7400**  | ![](img_70701c46fc374f1.jpg) |
| DFA-022826-DSFIX<br>00322163 | ![](img_70701c46fc374f1.jpg) |

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