July 2, 2008

NewMarket Corporation Schedules Conference Call and Webcast to Review Second Quarter 2008 Financial Results

NewMarket Corporation (NYSE:NEU) announced today it will release second quarter 2008 earnings at the close of business on Thursday, July 31, 2008. The earnings announcement will also be available on the company's website at www.NewMarket.com beginning Friday, August 1, 2008. A conference call and Internet webcast is scheduled for 10:00 a.m. EDT on Friday, August 1, to review second quarter 2008 financial results.

You can access the conference call live by dialing 1-877-407-8031 (domestic) or 1-201-689-8031 (international) and requesting the NewMarket conference call. To avoid delays, callers should dial in five minutes early. The call will also be broadcast via the Internet and can be accessed through the Company's website at www.NewMarket.com or www.investorcalendar.com. A teleconference replay of the call will be available until August 8 at 11:59 p.m. EDT by dialing 1-877-660-6853 (domestic) and 1-201-612-7415 (international). The account number is 286. The conference ID number is 290543. A webcast replay will be available for 30 days.

NewMarket Corporation through its subsidiaries, Afton Chemical Corporation and Ethyl Corporation, develops, manufactures, blends, and delivers chemical additives that enhance the performance of petroleum products. From custom-formulated chemical blends to market-general additive components, the NewMarket family of companies provides the world with the technology to make fuels burn cleaner, engines run smoother and machines last longer.