# EDGAR Filing Document

**Accession Number:** 0001411207
**File Stem:** 0001193125-26-214675
**Filing Date:** 2026-5
**Character Count:** 6758
**Document Hash:** be023cfc96aaa668b039f0f0beb07fe2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-214675.hdr.sgml**: 20260508

**ACCESSION NUMBER**: 0001193125-26-214675

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260506

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**FILED AS OF DATE**: 20260508

**DATE AS OF CHANGE**: 20260508

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Allison Transmission Holdings Inc
- **CENTRAL INDEX KEY:** 0001411207
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTOR VEHICLE PARTS & ACCESSORIES [3714]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35456
- **FILM NUMBER:** 26958523

**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

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): May 6, 2026

## ALLISON TRANSMISSION HOLDINGS, INC.

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-35456** | **26-0414014** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **One Allison Way, Indianapolis, Indiana** | **46222** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

#### Registrant's telephone number, including area code: (317) 242-5000

#### Not Applicable

#### (Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br> **Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, $0.01 par value | ALSN | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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| | |
|:---|:---|
| **Item 5.02** | **Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**  |

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The Compensation Committee (the "Committee") of the Board of Directors of Allison Transmission Holdings, Inc. (the "Company") previously approved the Executive Change in Control and Severance Plan (the "Severance Plan"), which provides severance benefits to senior level employees of Allison Transmission, Inc., a wholly owned subsidiary of the Company, and designated Eric C. Scroggins, the Chief Legal Officer and Assistant Secretary of the Company, as a Tier 1/2 Participant in the Severance Plan. On May 6, 2026, the Committee approved Mr. Scroggins' participation in the Severance Plan as a Tier 1 Participant. The Severance Plan is listed as an exhibit to the Company's most recently filed Annual Report on Form 10-K.

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| | |
|:---|:---|
| **Item 5.07** | **Submission of Matters to a Vote of Security Holders.**  |

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On May 6, 2026, the Company held its annual meeting of stockholders. At the annual meeting, stockholders took the following actions:

• elected nine directors for one-year terms ending at the 2027 annual meeting of stockholders (Proposal 1);

• ratified the appointment of PricewaterhouseCoopers LLP ("PwC") as the Company's independent registered public accounting firm for 2026 (Proposal 2); and

• approved, in an advisory, non-binding vote, the compensation paid to the Company's named executive officers ("Executive Compensation") (Proposal 3).

The vote tabulation for each proposal follows:

#### Proposal 1 - Election of Directors.

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| | | | | |
|:---|:---|:---|:---|:---|
| NOMINEES | FOR | AGAINST | ABSTAIN | BROKER NON-VOTES |
|  Judy L. Altmaier | 71134529 | 1454365 | 375889 | 4902906 |
| D. Scott Barbour | 72593397 | 355266 | 16120 | 4902906 |
|  Philip J. Christman | 65932457 | 6441896 | 590430 | 4902906 |
|  David C. Everitt | 71075137 | 1872463 | 17183 | 4902906 |
|  David S. Graziosi | 71830548 | 1116804 | 17431 | 4902906 |
|  Carolann I. Haznedar | 71744480 | 1190862 | 29441 | 4902906 |
|  Sasha Ostojic | 72863411 | 84133 | 17239 | 4902906 |
|  Gustave F. Perna | 72609598 | 339201 | 15984 | 4902906 |
|  Krishna Shivram | 72522639 | 425005 | 17139 | 4902906 |

---

#### Proposal 2 - Ratification of Appointment of PwC.
<u> FOR</u> <u> AGAINST</u> <u> ABSTAIN</u> <br> 77,162,806 690,303 14,580

#### Proposal 3 - Advisory Vote to Approve Executive Compensation.

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| | | | |
|:---|:---|:---|:---|
| FOR | AGAINST | ABSTAIN | BROKER NON-VOTES |
| 70176855 | 2759179 | 28749 | 4902906 |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | |
|:---|:---|:---|
|  | **Allison Transmission Holdings, Inc.** | **Allison Transmission Holdings, Inc.** |
| Date: May 8, 2026 | By: | /s/ Eric C. Scroggins |
|  | Name: | Eric C. Scroggins |
|  | Title: | Chief Legal Officer and Assistant Secretary |

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