Energy stocks lead S&amp;P 500 higher as investors start treating major firms like survivors — including by removing “short” bets. Wed. gainers:

Noble $NBL +23.3%
Apache $APA +22.3
Marathon $MRO +17.2
Valero $VLO +14.5
Conoco $COP +9.7
Exxon $XOM +5.5
Chevron $CVX +5.2

S&amp;P 500 +2.7