U.S. stocks gain; S&P 500 hits intraday record By: MarketWatch March 21, 2014 at 08:59 AM EDT The S&P 500 set a fresh intraday record, as U.S. stocks are on track to record a second straight week of solid gains. Read More >> Related Stocks: Commscope Holding Company Darden Restaurants Nike Inc Standard & Poors 500 Symantec Corp