NewMarket Corporation Increases Quarterly Dividend by 25% to $0.75

The Board of Directors of NewMarket Corporation

declared a quarterly dividend in the amount of 75 cents per share on the common stock of the Corporation. The dividend is payable January 1, 2012 to NewMarket shareholders of record at the close of business on December 15, 2011. This raises our dividend by 15 cents per share, which represents a 25% increase from the previous level.