NewMarket Corporation Schedules Conference Call and Webcast to Review First Quarter 2007 Financial Results 

Richmond, VA—April 10, 2007—NewMarket Corporation (NYSE: NEU) announced today it will release first quarter 2007 earnings at the close of business on Tuesday, April 24, 2007.  The earnings announcement will also be available on the company’s website at beginning Wednesday, April 25, 2007.  The annual meeting of shareholders of NewMarket Corporation will be Thursday, April 26, 2007.  A conference call and Internet webcast is scheduled for 11:00 a.m. EDT on Friday, April 27, 2007 to review first quarter 2007 financial results. 

You can access the conference call live by dialing 877-407-8031 (domestic) or 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 or   A teleconference replay of the call will be available until May 4, 2007 at 11:59 p.m. EDT by dialing 877-660-6853 (domestic) and 201-612-7415 (international).  The account number is 286.  The conference ID number is 238238.  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