Gap popped on heavy volume, fueled by takeover rumors.
Wal-Mart slipped as the horse meat tainted food scandal widened in Europe. Wal-Mart's British supermarket, Asda said that it had discovered horse DNA in its beef bolognese sauce.
H&R Block hit a 52-week high as Oppenheimer raised its target price on the tax preparation company to $27 from $24 with an "outperform" rating.
Entergy hit a 52-week low after the company filed updated plans for spin-off of its transmission assets with the SEC.
Google hit another historic high. Shares of the search company are up nearly 12 percent year-to-date.
—By CNBC's Lori Spechler
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