Knight Capital shares pare rally gains after hours By: MarketWatch August 03, 2012 at 16:57 PM EDT Shares of Knight Capital Group Inc. shed some of Friday’s gain after the closing bell as one of the most actively traded stocks in after-hours activity. Read More >> Related Stocks: Berkshire Hathaway Berkshire Hathaway E Trade Financial Electronic Arts LPL Financial Holdings Inc Zynga Inc Cl A