NewMarket Corporation Schedules Conference Call and Webcast to Review Second Quarter 2004 Results 
Richmond, VA --- July, 14, 2004 --- NewMarket Corporation (NYSE: NEU) announced today it will release second quarter 2004 earnings at the close of business on July 29, 2004.  The earnings announcement will also be available on the company’s website at beginning July 30, 2004.  A conference call and Internet webcast is scheduled for 10:00 a.m. EDT on July 30 to review second quarter 2004 results. 

You can access the conference call live by dialing 800-657-1269 (domestic) or  973-409-9259 (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 8-2-04 by dialing 877-519-4471 (domestic) and 973-341-3080 (international).  The replay passcode is 4974751.  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.

Forward-Looking Statement
Some of the information contained in this press release constitutes forward-looking comments within the meaning of the Private Securities Litigation Reform Act of 1995.  Although NewMarket’s management believes its expectations are based on reasonable assumptions within the bounds of its knowledge of its business and operations, there can be no assurance that actual results will not differ materially from expectations.  Factors that could cause actual results to differ from expectations are included in NewMarket’s (Ethyl’s) latest annual report on Form 10-K, which is available upon request.


     NewMarket Corporation, Richmond
     Investor Relations: David A. Fiorenza, 804-788-5555
     Fax: 804-788-5688