Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga June 02, 2014 at 08:18 AM EDT National Oilwell Varco (NYSE: NOV) shares fell 9.14% to $74.39 in pre-market trading after the company reported the closing of spinoff ... Read More >> Related Stocks: Clean Energy Fuels Clovis Oncology Inc Natl Oilwell Varco