NewMarket Corporation (NYSE:NEU) announced today that it has commenced an offer to exchange $350,000,000 aggregate principal amount of its 4.100% Senior Notes due 2022 that have been registered under the Securities Act for an equal aggregate principal amount of 4.100% Senior Notes due 2022 that were issued on December 20, 2012 and have not been registered under the Securities Act. The terms of the exchange notes are identical in all material respects to the terms of the initial notes for which they are being exchanged, except that the transfer restrictions, the registration rights and provisions for additional interest applicable to the initial notes are not applicable to the exchange notes. NewMarket is commencing the exchange offer to satisfy its obligations under a registration rights agreement entered into in connection with the issuance of the initial notes. The exchange offer does not represent a new financing transaction. NewMarket will accept for exchange any and all initial notes validly tendered prior to 5:00 p.m., New York City time, on April 23, 2013, unless NewMarket extends the exchange offer in its sole discretion. Copies of the prospectus, the letter of transmittal and the other transmittal materials governing the exchange offer may be obtained from the Exchange Agent, U.S. Bank National Association, at the following address: U.S. Bank Global Corporate Trust ServicesTwo James Center1021 E. Cary Street, Suite 1850Mail Station: EX-VA-URITRichmond, VA 23219-4000Phone: (804) 771-7935Fax: (804) 771-7940Attn: William F. Michie, III This press release is not an offer to exchange or a solicitation of acceptance of the offer to exchange any notes. The exchange offer is made only pursuant to NewMarket’s prospectus, dated March 22, 2013, which is being filed on or about the date hereof with the Securities and Exchange Commission as part of NewMarket’s Registration Statement on Form S-4, and the related letter of transmittal. The Registration Statement was declared effective by the Securities and Exchange Commission on March 22, 2013.