 Vanguard Group Inc. decreased its stake in NewMarket Co. NYSE:NEU by 6.6 in the 2nd quarter, Holdings Channel.com reports. The fund owned 798,611 shares of the specialty chemicals companys stock after selling 56,337 shares during the quarter. Vanguard Group Inc. owned approximately 0.07 of NewMarket worth 319,827,000 as of its most recent SEC filing. Other ... 