NewMarket Corporation (NYSE:NEU) announced today it expects to release third quarter 2025 earnings at the close of business on Thursday, October 30, 2025. The earnings announcement will also be available on the Company's website at www.NewMarket.com the following day. A conference call and webcast are scheduled for 3:00 pm ET on Friday, October 31, 2025 to review third quarter 2025 financial results.

You can access the conference call live by dialing 1-877-545-0523 (domestic) or 1-973-528-0016 (international) and requesting the NewMarket conference call. To avoid delays, callers should dial in five minutes early. A teleconference replay of the call will be available until Friday, November 7, 2025 at 3:00 p.m. ET by dialing 1-877-481-4010 (domestic) or 1-919-882-2331 (international). The replay passcode is 53053.

The call will also be broadcast via the internet and can be accessed through the Company's website at www.NewMarket.com or https://www.webcaster5.com/Webcast/Page/2001/53053. A webcast replay will be available for 30 days.

NewMarket Corporation is a holding company operating through its subsidiaries, Afton Chemical Corporation (Afton), Ethyl Corporation (Ethyl), American Pacific Corporation (AMPAC), and Calca Solutions, LLC (Calca). The Afton and Ethyl companies develop, manufacture, blend, and deliver chemical additives that enhance the performance of petroleum products. AMPAC is a manufacturer of specialty materials primarily used in solid rocket motors for the aerospace and defense industries. Calca is the nation's leading producer of UltraPure and high-purity hydrazine – essential, mission-critical propellants that enable advanced aerospace and defense applications. The NewMarket family of companies has a long-term commitment to its people, to safety, to providing innovative solutions for its customers, and to making the world a better place.

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NewMarket Corporation

Investor Relations

Timothy K. Fitzgerald

Phone: 804-788-5555

Email: investorrelations@NewMarket.com

NewMarket Corporation Schedules Conference Call and Webcast to Review Third Quarter 2025 Financial Results