The top aftermarket NYSE gainers Wednesday were: Spirit Aerosystems Holdings, Penn Virginia, Sturm, Ruger & Co, Macquarie Infrastructure, Qihoo 360 Technology Co, Aegean Marine Petroleum Network, Whiting Petroleum Corp, MGIC Investment Corp, Stone Energy and QEP Resources.

Spirit Aerosystems Holdings, Inc. (SPR) shares surged 5.09 percent to $24.96 in aftermarket trading session. The stock has a 52-week low of $14.27, a 52-week high of $26.49 and $3.39 billion in market capitalization.

Penn Virginia Corp. (PVA) shares surged 4.85 percent to $6.05 in post market trading session. Its fourth quarter adjusted net loss narrowed to $0.14 per share from $0.24 per share in the same quarter last year.

Sturm, Ruger & Co, Inc. (RGR) shares gained 3.82 percent to $44.60 in post market trading session. The company reported fourth quarter net income of $0.54 per share, up from $0.30 per share in the same quarter a year-ago. The company also announced that its Board of Directors declared a dividend of $0.212 per share for the fourth quarter, for shareholders of record as of March 9, 2012, payable on March 23, 2012.

Macquarie Infrastructure Co, LLC (MIC) shares advanced 3.81 percent to $30.00 in aftermarket trading session. The company announced that its board of directors authorized the payment of a $0.20 per share cash dividend for the fourth quarter of 2011 payable on March 8, 2012 to shareholders of record on March 5, 2012.

Qihoo 360 Technology Co. Ltd. (QIHU) shares rose 3.71 percent to $18.15 in post market trading session. The company reported fourth quarter net profit of $0.20 per share compared to analysts’ estimation of $0.12 per share. The company expects first quarter revenue to be in a range of $63 to $65 million against analysts’ estimation of $55.21 million.

Aegean Marine Petroleum Network Inc. (ANW) shares advanced 2.91 percent to $7.08 in aftermarket trading session. The company swung to fourth quarter net profit of $0.14 per share compared to net loss of $0.26 per share in the same quarter last year. The company also declared quarterly dividend of $ 0.01 per share for the fourth quarter payable on March 21, 2012 to shareholders of record as of March 7, 2012.

Whiting Petroleum Corp. (WLL) shares advanced 2.9 percent to $58.20 in post market trading session. The company reported fourth quarter adjusted net profit of $124.52 million or $1.05 per share compared to $98.99 million or $0.84 per share and against analysts’ estimation o f $0.96 per share.

MGIC Investment Corp. (MTG) shares advanced 2.35 percent to $4.80 in post market trading session. The company stock plunged more than 6 percent in regular trading session.

Stone Energy Corp. (SGY) shares advanced 2.29 percent to $34.40 in post market trading session. Its fourth quarter net income rose to $45.52 million or $0.93 per share from $23.76 million or $0.49 per share in the same quarter a year-ago.

QEP Resources, Inc. (QEP) rose 2 percent to $32.20 in aftermarket trading session. The company reported fourth quarter adjusted net profit of $104.6 million or $0.58 per share compared to $44.8 million or $0.25 per share in the same quarter last year and against analysts’ estimation of $0.46 per share.

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