NewMarket Corporation Schedules Conference Call and Webcast to Review Third Quarter 2005 Financial Results 
10/10/2005 

Richmond, VA—October 10, 2005 --NewMarket Corporation (NYSE: NEU) announced today it will release third quarter 2005 earnings at the close of business on Wednesday, October 26, 2005.  The earnings announcement will also be available on the company’s website at www.NewMarket.com beginning October 27, 2005.  A conference call and Internet webcast is scheduled for 10:00 a.m. EDT on Friday, October 28, to review third quarter 2005 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 www.NewMarket.com or www.investorcalendar.com.    A teleconference replay of the call will be available until November 2, 2005, at 11:59 p.m. by dialing 877-660-6853 (domestic) and 201-612-7415 (international).  The account number is 286.  The conference ID number is 172707.  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, Virginia Investor Relations
David A. Fiorenza
Tel: 804-788-5555 Fax: 804-788-5688
investorrelations@newmarket.com