# EDGAR Filing Document

**Accession Number:** 0000861929
**File Stem:** 0002071844-26-000274
**Filing Date:** 2026-3
**Character Count:** 3665
**Document Hash:** 34f5c9d963ab730d68d58ffe368b6528
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002071844-26-000274.hdr.sgml**: 20260320

**ACCESSION NUMBER**: 0002071844-26-000274

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260320

**DATE AS OF CHANGE**: 20260319

**EFFECTIVENESS DATE**: 20260320

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DIMENSIONAL INVESTMENT GROUP INC
- **CENTRAL INDEX KEY:** 0000861929

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-33980
- **FILM NUMBER:** 26775403

**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:** DIMENSIONAL INVESTMENT GROUP INC/
- **DATE OF NAME CHANGE:** 19930712

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DIMENSIONAL INVESTMENT GROUP INC
- **DATE OF NAME CHANGE:** 19930712

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DFA US LARGE CAP INC
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### U.S. LARGE COMPANY PORTFOLIO (Series ID: S000001014)

---

|  |  |  |
|:---|:---|:---|
| Class Name                   | Ticker Symbol | Class ID   |
| U.S. LARGE COMPANY PORTFOLIO | DFUSX         | C000002765 |
| ETF Class                    | nan           | C000268948 |

---

## Series and Classes Contracts Data

### U.S. LARGE COMPANY PORTFOLIO (Series ID: S000001014)

| Class ID   | Class Name                   | Ticker Symbol   |
|:---|:---|:---|
| C000002765 | U.S. LARGE COMPANY PORTFOLIO | DFUSX           |
| C000268948 | ETF Class                    |  |

---

| | |
|:---|:---|
| **DFA Investment Dimensions Group Inc.**  | **DFA Investment Dimensions Group Inc.**  |
| U.S. Large Cap Equity Portfolio <br> U.S. Small Cap Value Portfolio <br> U.S. Targeted Value Portfolio <br> U.S. Core Equity 1 Portfolio <br> U.S. Core Equity 2 Portfolio <br> U.S. Vector Equity Portfolio <br>| U.S. Small Cap Portfolio <br> U.S. Micro Cap Portfolio <br> U.S. High Relative Profitability Portfolio <br> DFA Real Estate Securities Portfolio <br> U.S. Large Cap Growth Portfolio <br> U.S. Small Cap Growth Portfolio  |

---

**Dimensional Investment Group Inc.**

U.S. Large Company Portfolio

SUPPLEMENT TO THE CURRENTLY EFFECTIVE <br> PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION <br>

Effective March 20, 2026, the following is added to the cover page of the currently effective Prospectus and Statement of Additional Information ("SAI") of the portfolios listed above, each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. Capitalized terms not otherwise defined in this supplement have the meanings assigned to them in the Prospectus and SAI.

As of March 20, 2026, the U.S. Micro Cap Portfolio began offering ETF Class shares. The Fund has registered ETF Class Shares for the U.S. Large Cap Equity Portfolio, U.S. Small Cap Value Portfolio, U.S. Targeted Value Portfolio, U.S. Core Equity 1 Portfolio, U.S. Core Equity 2 Portfolio, U.S. Vector Equity Portfolio, U.S. Small Cap Portfolio, U.S. High Relative Profitability Portfolio, DFA Real Estate Securities Portfolio, U.S. Large Cap Growth Portfolio, U.S. Small Cap Growth Portfolio and U.S. Large Company Portfolio, but they are not offered for sale at this time.

*The date of this Supplement is March 20, 2026*

------