NewMarket Corporation Schedules Conference Call and Webcast to Review Second Quarter 2007 Financial Results 
7/11/2007 

Richmond, VA--July 11, 2007---NewMarket Corporation (NYSE: NEU) announced today it will release second quarter 2007 earnings at the close of business on Friday, July 27, 2007.  The earnings announcement will also be available on the company’s website at www.NewMarket.com beginning Monday, July 30, 2007.  A conference call and Internet webcast is scheduled for 10:00 a.m. EDT on Tuesday, July 31, 2007 to review second quarter 2007 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 7, 2007 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 248541.  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.

CONTACT: NewMarket Corporation, Richmond
  Investor Relations
  David A. Fiorenza, 804-788-5555
  Fax:  804-788-5688
  Email:  investorrelations@NewMarket.com