[Form 4] ALLISON TRANSMISSION HOLDINGS, INC. Insider Trading Activity

Rhea-AI Filing Summary

Judy L. Altmaier, a director of Allison Transmission Holdings, Inc. (ALSN), reported a transaction dated 08/29/2025 in which 64 dividend equivalent rights were acquired at a price of $0. These dividend equivalents accrued on previously awarded deferred stock units (DSUs) and vest proportionately with those DSUs, with each dividend equivalent being the economic equivalent of one share of common stock.

Following the reported transaction, Ms. Altmaier beneficially owns 1,264 shares of Allison Transmission common stock in a direct ownership form. The filing was signed by an attorney-in-fact on 09/03/2025. No other transactions or derivative positions are disclosed in this Form 4.

Positive

• Director alignment: Dividend equivalents converting to share-equivalents increase the director's economic stake to 1,264 shares
• Non-cash, routine compensation: Transaction represents vesting of previously awarded DSUs rather than a market purchase or new cash compensation

Negative

• None.

Insights

Financial Analyst

TL;DR: Small, non-cash accrual converted to share-equivalents increases director alignment with shareholders.

The reported acquisition of 64 dividend equivalent rights is a routine, non-cash event tied to previously granted DSUs. At a reported price of $0, these are dividend-equivalent payments vesting with DSUs rather than open-market purchases, and they increase the director's direct economic exposure to Allison Transmission by a modest amount to 1,264 shares. This transaction is immaterial to the company’s capital structure or market capitalization but does slightly strengthen alignment between the director and shareholders.

Corporate Governance Expert

TL;DR: Typical executive compensation mechanics; shows continued equity-based retention without material dilution.

The filing documents standard compensation administration: dividend equivalents on deferred stock units converting to share equivalents. Because the transaction is non-cash and related to existing DSUs, it does not indicate new share issuance in the open market nor a change in compensation policy. The increase to 1,264 directly held shares is small and consistent with retention incentives common for directors, offering modest additional alignment with shareholder interests.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Altmaier Judy L

(Last) (First) (Middle)

C/O ALLISON TRANSMISSION HOLDINGS, INC.

ONE ALLISON WAY

(Street)

INDIANAPOLIS IN 46222

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Allison Transmission Holdings Inc [ ALSN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/29/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Dividend Equivalent Rights	(1)	08/29/2025		A		64		(1)	(1)	Common Stock	64	$0	1,264	D

Explanation of Responses:

1. The dividend equivalent rights accrued on previously awarded deferred stock units ("DSUs") and vest proportionately with the DSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

	/s/ Preston B. Ray, attorney-in-fact	09/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What did Judy L. Altmaier report on Form 4 for ALSN?

She reported acquiring 64 dividend equivalent rights on 08/29/2025 that vest with previously awarded DSUs; these are the economic equivalent of 64 shares.

How many Allison Transmission shares does the reporting person own after the transaction?

The Form 4 shows 1,264 shares beneficially owned following the reported transaction.

Did the Form 4 show any cash purchase or sale by the director?

No; the 64 dividend equivalents were recorded at a price of $0, indicating a non-cash accrual tied to DSUs.

When was the transaction and when was the Form 4 signed?

The transaction date is 08/29/2025 and the form was signed by an attorney-in-fact on 09/03/2025.

Are there any derivative securities or other transactions disclosed?

No derivative transactions or additional securities classes are disclosed in this Form 4; only the dividend equivalent rights and resulting common stock equivalents are reported.