X0306 4 2012-09-04 0 0001282637 NEWMARKET CORP NEU 0001246521 HUANG C S WARREN 330 SOUTH FOURTH STREET RICHMOND VA 23219 0 1 0 0 President Afton Chemical Corp Common Stock 2012-09-04 4 F 0 132 246.93 D 2405 D Common Stock 1962.73 I NewMarket Savings Plan This filing is being made to report the shares of common stock surrendered to the Company on the vesting date to satisfy tax withholding obligations relating to the stock award previously reported on Form 4 filed on August 17, 2012. /s/ M. Rudolph West (POA for Warren Huang) 2012-09-05