# EDGAR Filing Document

**Accession Number:** 0001411207
**File Stem:** 0001140361-23-013599
**Filing Date:** 2023-3
**Character Count:** 1988
**Document Hash:** a37ef0fe6c5872e090cd55470368809a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-23-013599.hdr.sgml**: 20230324

**ACCESSION NUMBER**: 0001140361-23-013599

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230324

**DATE AS OF CHANGE**: 20230324

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Allison Transmission Holdings Inc
- **CENTRAL INDEX KEY:** 0001411207
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTOR VEHICLE PARTS & ACCESSORIES [3714]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35456
- **FILM NUMBER:** 23757884

**BUSINESS ADDRESS:**
- **STREET 1:** ONE ALLISON WAY
- **CITY:** Indianapolis
- **STATE:** IN
- **ZIP:** 46222
- **BUSINESS PHONE:** (317) 242-5000

**MAIL ADDRESS:**
- **STREET 1:** ONE ALLISON WAY
- **CITY:** Indianapolis
- **STATE:** IN
- **ZIP:** 46222

### UNITED STATES<br>

### SECURITIES AND EXCHANGE COMMISSION<br>

### Washington, D.C. 20549

### SCHEDULE 14A INFORMATION

#### Proxy Statement Pursuant to Section 14(a) of the Securities<br>

#### Exchange Act of 1934 (Amendment No.)
Filed by the Registrant ☑

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐<br> Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☑ Definitive Additional Materials

☐<br> Soliciting Material under §240.14a-12

## ALLISON TRANSMISSION HOLDINGS, INC.<br>

## (Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☑ No fee required

☐<br>Fee paid previously with preliminary materials

☐<br> Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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