The top after-market NYSE gainers on Wednesday are: Williams Companies, Ion Geophysical, Cliffs Natural Resources, Gerova Financial Group and Resolute Energy. The top after-market NYSE losers are: Skechers, Spectrum Brands Holdings, Oceaneering International, First Marblehead and K-Sea Transportation.

Gainers

Williams Companies, Inc. (NYSE:WMB) shares surged 13.29 in post market trading session after the company announced that the Board of Directors has approved pursuing a plan to separate the Company's businesses into two stand-alone, publicly traded corporations.

Ion Geophysical Corp. (NYSE:IO) shares climbed 10.94 percent to $10.95 in aftermarket trading session. The company swung to fourth quarter profit of $20.05 million or $0.13 per share compared to net loss of $51.69 million or $0.44 per share in the same quarter last year.

Cliffs Natural Resources Inc. (NYSE:CLF) shares gained 9.82 percent to $102.00 in aftermarket trading session. The company reported fourth quarter net income of $2.25 per share against analysts’ estimation of $2.22 per share. It also raised its 2011 North American iron-ore sales forecast to about 28 million tons.

Gerova Financial Group Ltd. (NYSE:GFC) shares advanced 4.85 percent to $6.70 in aftermarket trading session. Its shares plunged 31.29 percent to $6.39 in regular trading session.

Resolute Energy Corp. (NYSE:REN) shares advanced 4.46 percent to $18.75 in aftermarket trading session. The stock has a 52 week low of $10.46 and 52 week high of $18.43 and has $984.76 million market capitalization.

Losers

Skechers USA., Inc. (NYSE:SKX) shares plunged 6.66 percent to $20.60 in post-market trading session. The company reported fourth quarter net income of $3.24 million or $0.07 per share from $27.95 million or $0.58 per share in the same quarter a year-ago.

Spectrum Brands Holdings, Inc. (NYSE:SPB) shares declined 5.49 percent to $29.97 in post market trading session. The stock has a 52 week low of $22.00 and 52 week high of $36.61 and has $1.62 billion market capitalization.

Oceaneering International, Inc. (NYSE:OII) shares fell 3.88 percent to $78.00 in aftermarket trading session as its first quarter guidance fell short of expectations. The company expects first quarter earnings in the range of $0.65 to $0.70 per share, while analysts expected $0.79 per share.

First Marblehead Corp. (NYSE:FMD) shares declined 3.32 percent to $2.38 in post market trading session. The stock has a 52 week low of $1.94 and 52 week high of $4.08 and has $248.05 million market capitalization.

K-Sea Transportation Partners LP (NYSE:KSP) shares declined 3.13 percent to $6.20 in aftermarket trading session.

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