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): ~~August~~October 429, 2025

ALLISON TRANSMISSION HOLDINGS, INC.

(Exact Name of Registrant as Specified in its Charter)


Delaware	001-35456	26-0414014
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer 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 (see General Instructions A.2. below):

☐	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 Symbol(s)		Name of each ~~exchangeon~~exchange 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. ☐

Item 2.02

Results of Operations and Financial Condition.

On ~~August~~October 429, 2025, Allison Transmission Holdings, Inc. (“Allison”) published an earnings release reporting its financial results for the three months ended ~~June~~September 30, 2025. A copy of the earnings release is attached as Exhibit 99.1 hereto. Following the publication of the earnings release, Allison will host an earnings call on ~~August~~October 429, 2025 at 5:00 p.m. ET on which its financial results for the three months ended ~~June~~September 30, 2025 will be discussed. The investor presentation materials that will be used for the call are attached as Exhibit 99.2 hereto.

On ~~August~~October 429, 2025, Allison posted the materials attached as Exhibits 99.1 and 99.2 on its website (www.allisontransmission.com).

As discussed on page 2 of Exhibit 99.2, the investor presentation contains forward-looking statements within the meaning of the federal securities laws. These statements are present expectations and are subject to the limitations listed therein and in Allison’s other Securities and Exchange Commission filings, including that actual events or results may differ materially from those in the forward-looking statements.

The foregoing information (including the exhibits hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing.

Item 9.01

Financial Statements and Exhibits.

(d)

Exhibits:

Exhibit Number		Description
ExhibitNumber		Description
99.1		Earnings release dated ~~August~~October 429, 2025.
99.2		Investor presentation materials dated ~~August~~October 429, 2025.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.

	Allison Transmission Holdings, Inc.
Date: August 4, 2025	By:	/s/ Eric C. Scroggins
Date: October 29, 2025	By:	/s/ Eric C. Scroggins
	Name:	Eric C. Scroggins
	Title:	Vice President, General Counsel and Assistant Secretary

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