Allison Transmission (ALSN) 8-K Allison Transmission Closes Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes

Exhibit 99.1

Allison Transmission Closes Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes

Due 2031

INDIANAPOLIS, November 19, 2020 – Allison Transmission Holdings, Inc. (NYSE: ALSN) (“Allison” or the “Company”) today announced that its wholly owned subsidiary, Allison Transmission, Inc. (the “Issuer”), completed its previously announced offering of $1 billion in aggregate principal amount of 3.750% Senior Notes due 2031 (the “Notes”) in a private placement (the “Offering”) exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). The Issuer used the net proceeds from the offering, together with cash on hand, to redeem $1 billion aggregate principal amount of its outstanding 5.000% Senior Notes due 2024 (the “2024 Notes”) and to pay related fees and expenses.

“The successful closing of this offering supports our long-standing commitment to prudent balance sheet management and our opportunistic approach to the capital markets with a focus on a low-cost, flexible and pre-payable debt structure with long-date maturities,” said Fred Bohley, Senior Vice President, Chief Financial Officer and Treasurer at Allison. “As a result of this offering, we anticipate an annual savings of approximately $12.5 million in interest expense, with the earliest maturity on our long-term debt due in 2026.”

The Company also announced that the Issuer entered into an amendment (the “Amendment”) to the credit agreement governing its senior secured credit facilities. Pursuant to the Amendment, among other things, the Issuer increased the commitments under its revolving credit facility from $600 million to $650 million and extended the maturity date thereof to September 2025.

The Notes were offered in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act, and to certain non-U.S. persons in transactions outside of the United States in reliance on Regulation S under the Securities Act. The Notes will not be registered under the Securities Act or the securities laws of any state or jurisdiction, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements.

This press release shall not constitute an offer to sell or the solicitation of an offer to purchase the Notes, nor shall there be any sale of the Notes in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

About Allison Transmission

Allison Transmission (NYSE: ALSN) is the world’s largest manufacturer of fully automatic transmissions for medium- and heavy-duty commercial vehicles and medium- and heavy-tactical U.S. defense vehicles, as well as a supplier of commercial vehicle propulsion solutions, including electric hybrid and fully electric propulsion systems. Allison products are used in a wide variety of applications, including on-highway trucks (distribution, refuse, construction, fire and emergency), buses (school, transit and coach), motorhomes, off-highway vehicles and equipment (energy, mining and construction applications) and defense vehicles (wheeled and tracked). Founded in 1915, the company is headquartered in Indianapolis, Indiana, USA. With a market presence in more than 80 countries, Allison has regional headquarters in the Netherlands, China and Brazil with manufacturing facilities in the U.S., Hungary and India. Allison also has approximately 1,500 independent distributor and dealer locations worldwide.

Forward-Looking Statements

This press release contains forward-looking statements. All statements other than statements of historical fact contained in this press release are forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expect,” “plans,” “project,” “anticipate,” “believe,” “estimate,” “predict,” “intend,” “forecast,” “could,” “potential,” “continue” or the negative of these terms or other similar terms or phrases. Forward-looking statements are not guarantees of future performance and involve known and unknown risks. Factors which may cause the actual results to differ materially from those anticipated at the time the forward-looking statements are made include, but are not limited to: risks related to the duration and spread of the COVID-19 outbreak, mitigating efforts deployed by government agencies and the public at large, and the overall impact from such outbreak on economic conditions, financial market volatility and our business, including but not limited to the operations of our manufacturing and other facilities, our supply chain, our distribution processes and demand for our products and the corresponding impacts to our net sales and cash flow; risks related to our substantial indebtedness; our participation in markets that are competitive; the highly cyclical industries in which certain of our end users operate; uncertainty in the global regulatory and business environments in which we operate; 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; our ability to identify, consummate and effectively integrate acquisitions; 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; general economic and industry conditions; increases in cost, disruption of supply or shortage of raw materials or components used in our products; 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; risks associated with our international operations, including increased trade protectionism; labor strikes, work stoppages or similar labor disputes, which could significantly disrupt our operations or those of our principal customers; our intention to pay dividends and repurchase shares of our common stock; and other risks and uncertainties associated with our business described in our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Although we believe the expectations reflected in such forward-looking statements are based upon reasonable assumptions, we can give no assurance that the expectations will be attained or that any deviation will not be material. All information is as of the date of this press release, and we undertake no obligation to update any forward-looking statement to conform the statement to actual results or changes in expectations.

Allison Transmission Contacts:

Claire Gregory

Director of Communications and Media Relations

Claire.Gregory@allisontransmission.com

(317) 694-2065