Exhibit 99.1

				News Release

Allison Transmission Announces 8% Increase to Quarterly Dividend,

$1 Billion Increase to Stock Repurchase Authorization and the Annual

Stockholders Meeting and Record Date

INDIANAPOLIS, February 20, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of conventional and electrified vehicle propulsion solutions and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions for commercial and defense vehicles, announced today that its Board of Directors has approved an increase in the Company’s quarterly dividend from $0.25 to $0.27 per share on the Company’s common stock and has declared a cash dividend of $0.27 per share on the Company’s common stock for the first quarter of 2025. Payment will be made on March 14 to stockholders of record at the close of business on March 3.

“For the sixth consecutive year, Allison’s Board of Directors has approved an increase to the quarterly dividend, demonstrating once again our unwavering commitment to prudent balance sheet management and capital allocation,” said Fred Bohley, Chief Operating Officer, Chief Financial Officer and Treasurer at Allison. “The consistent return of capital to shareholders, while simultaneously investing across the organization is supported by Allison’s strong financial performance, as well as our disciplined and well-defined approach to the capital structure.”

The payment of any future dividends will be at the discretion of the Board of Directors and will be dependent upon Allison Transmission’s financial position, results of operations, available cash, cash flow, capital requirements and other factors deemed relevant by the Board of Directors.

The Company also announced that its Board of Directors has approved a new authorization under the Company’s current stock repurchase program for the repurchase of up to an additional $1 billion. The new authorization brings the total amount authorized under the program to $5 billion.

Repurchases under the program may be made in the open market, in privately negotiated transactions or otherwise, with the amount and timing of repurchases depending on market conditions and corporate needs. Open market repurchases will be structured to occur within the pricing and volume requirements of Rule 10b-18. The Company may also, from time to time, enter into Rule 10b5-1 plans to facilitate repurchases of its shares under this authorization. This stock repurchase program does not obligate the Company to acquire any particular amount of its common stock and the program may be extended, modified, suspended or discontinued at any time at the Company’s discretion.

Finally, the Company also announced today that its 2025 annual meeting of stockholders will be held on May 7. The record date for the meeting will be March 10.

Page 1 of 2

Exhibit 99.1

				News Release

About Allison Transmission

Allison Transmission (NYSE: ALSN) is a leading designer and manufacturer of propulsion solutions for commercial and defense vehicles and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions that Improve the Way the World Works. Allison products are used in a wide variety of applications, including on-highway vehicles (distribution, refuse, construction, fire and emergency), buses (school, transit and coach), motorhomes, off-highway vehicles and equipment (energy, mining, construction and agriculture) and defense vehicles (tactical wheeled and tracked). Founded in 1915, the company is headquartered in Indianapolis, Indiana, USA. With a presence in more than 150 countries, Allison has regional headquarters in the Netherlands, China and Brazil, manufacturing facilities in the USA, Hungary and India, as well as global engineering resources, including electrification engineering centers in Indianapolis, Indiana, Auburn Hills, Michigan and London in the United Kingdom. Allison also has more than 1,600 independent distributor and dealer locations worldwide. For more information, visit https://allisontransmission.com.

Forward-Looking Statements

This press release contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and that do not relate to historical matters identify forward-looking statements. You should not place undue reliance on these forward-looking statements. Although forward-looking statements reflect management’s good faith beliefs, reliance should not be placed on forward-looking statements because they involve known and unknown risks, uncertainties and other factors, which may cause actual results, performance or achievements to differ materially from anticipated future results, performance or achievements expressed or implied by such forward-looking statements. Forward-looking statements speak only as of the date the statements are made. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events, changed circumstances or otherwise. These forward-looking statements are subject to numerous risks and uncertainties, including, but not limited to: our participation in markets that are competitive; our ability to prepare for, respond to and successfully achieve our objectives relating to technological and market developments, competitive threats and changing customer needs, including with respect to electric hybrid and fully electric commercial vehicles; increases in cost, disruption of supply or shortage of labor, freight, raw materials, energy or components used to manufacture or transport our products or those of our customers or suppliers, including as a result of geopolitical risks, wars and pandemics; global economic volatility; general economic and industry conditions, including the risk of recession; labor strikes, work stoppages or similar labor disputes, which could significantly disrupt our operations or those of our principal customers or suppliers; the highly cyclical industries in which certain of our end users operate; uncertainty in the global regulatory and business environments in which we operate; the concentration of our net sales in our top five customers and the loss of any one of these; the failure of markets outside North America to increase adoption of fully automatic transmissions; the success of our research and development efforts, the outcome of which is uncertain; U.S. and foreign defense spending; risks associated with our international operations, including acts of war and increased trade protectionism; the discovery of defects in our products, resulting in delays in new model launches, recall campaigns and/or increased warranty costs and reduction in future sales or damage to our brand and reputation; our ability to identify, consummate and effectively integrate acquisitions and collaborations; and risks related to our indebtedness.

Contacts

Jackie Bolles

Executive Director, Treasury and Investor Relations

ir@allisontransmission.com

(317) 242-7073

Claire Gregory

Director, Global External Communications

claire.gregory@allisontransmission.com

(317) 694-2065

Page 2 of 2