# EDGAR Filing Document

**Accession Number:** 0000355437
**File Stem:** 0002071844-26-000448
**Filing Date:** 2026-4
**Character Count:** 5250
**Document Hash:** 4b19cb58df886ecf90d330a80457867f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002071844-26-000448.hdr.sgml**: 20260429

**ACCESSION NUMBER**: 0002071844-26-000448

**CONFORMED SUBMISSION TYPE**: 8-A12B

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260429

**DATE AS OF CHANGE**: 20260429

**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:** 8-A12B
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43136
- **FILM NUMBER:** 26917877

**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

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12 (b) OR (g) OF THE

SECURITIES EXCHANGE ACT OF 1934

<u>DFA INVESTMENT DIMENSIONS GROUP INC.</u>

(Exact name of registrant as specified in its charter)

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| | |
|:---|:---|
| <u>Maryland</u> | <u>See Below</u> |
| (State of incorporation or organization) | (I.R.S. Employer Identification No.) |
|  <u>6300 Bee Cave Road, Building One, Austin, TX</u> | <u>78746</u> |
|  (Address of principal executive offices) | (Zip Code) |

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Securities to be registered pursuant to Section 12(b) of the Act:

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| | |
|:---|:---|
| Title of each class<br> <u>to be so registered</u> | Name of each exchange on which<br> <u>each class is to be registered</u> |
| Shares of common stock, par value of one cent ($0.01)<br>U.S. Small Cap Growth Portfolio: ETF Class Shares | The Nasdaq Stock Market LLC |

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If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box. [X]

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box. [ ]

If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box. [ ]

Securities Act registration statement or Regulation A offering statement file number to which this form relates: 002-73948

Securities to be registered pursuant to Section 12 (g) of the Act:

<u>None</u>

(Title of class)

------

#### INFORMATION REQUIRED IN REGISTRATION STATEMENT

#### Item 1. Descriptions of Registrant's Securities to be Registered.

A description of the class of shares of common stock, par value of one cent ($0.01), of the series of DFA Investment Dimensions Group Inc. (the "Fund") listed below to be registered hereunder is set forth in [Post-Effective Amendment No. 266](https://www.sec.gov/ix?doc=/Archives/edgar/data/355437/000035543726000120/c485bpos.htm) to the Fund's Registration Statement on Form N-1A (Commission File Nos. 002-73948; 811-03258), as filed with the Securities and Exchange Commission on February 27, 2026, which description is incorporated herein by reference.

The class of the series of the Fund that is registering securities, and its I.R.S. Employer Identification Number, is as follows:

U.S. Small Cap Growth Portfolio: ETF Class Shares US25239Y2467

#### Item 2. Exhibits

1. [The Fund's Articles of Amendment and Restatement is incorporated herein by reference to Exhibit (a)(1) to the Fund's Registration Statement on Form N-1A (Commission File Nos. 002-73948; 811-03258), as filed with the Securities and Exchange Commission on February 27, 2026.](https://www.sec.gov/Archives/edgar/data/355437/000035543726000120/ex99acharter-1.htm)

2. [The Fund's Articles Supplementary to the Charter is incorporated herein by reference to Exhibit (a)(2) to the Fund's Registration Statement on Form N-1A (Commission File Nos. 002-73948; 811-03258), as filed with the Securities and Exchange Commission on February 27, 2026.](https://www.sec.gov/Archives/edgar/data/355437/000035543726000120/ex99acharter-2.htm)

3. [The Fund's Amended and Restated Bylaws are incorporated herein by reference to Exhibit (b) to the Fund's Registration Statement on Form N-1A (Commission File Nos. 002-73948; 811-03258), as filed with the Securities and Exchange Commission on January 25, 2022.](https://www.sec.gov/Archives/edgar/data/355437/000179420222000021/ex28b.htm)

#### SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized, as of this 29<sup>th</sup> day of April, 2026.

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| | |
|:---|:---|
|  | DFA INVESTMENT DIMENSIONS GROUP INC. |
| By: | <u>/s/ Ryan P. Buechner</u> |
| Name: | Ryan P. Buechner |
| Title: | Vice President and Assistant Secretary |

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