The top after-market NYSE gainers on Wednesday are: Aegean Marine Petroleum, Teekay Tankers, Flotek Industries, Hovnanian Enterprises and AU Optronics Corp. The top after-market NYSE losers are: Northstar Realty Finance, Iamgold, NetQin Mobile, Silvercorp Metals and Talisman Energy.

Gainers:

Aegean Marine Petroleum Network Inc. (NYSE:ANW) shares surged 7.10 percent to $9.05 in aftermarket trading session. The company reported first quarter net income of $4 million or $0.09 per share compared to $14 million or $0.30 per share in the same quarter last year.

Teekay Tankers Ltd. (NYSE:TNK) shares gained 4.55 percent to $9.88 in post market trading session. The company announced that announced that its Board of Directors has voted to declare a cash dividend of $0.25 per share for the quarter ended March 31, 2011.

Flotek Industries, Inc. (NYSE:FTK) shares advanced 4.44 percent to $9.65 in post market trading session. The company swung to first quarter net income of $5.5 million or $0.15 per share compared to net loss of $12.1 million or $0.60 per share in the same quarter last year.

Hovnanian Enterprises Inc. (NYSE:HOV) shares gained 3.46 percent to $2.69 in aftermarket trading session. Its shares plunged 6.81 percent in regular trading session. The stock has a 52 week low of $2.59 and 52 week high of $7.74 and has $202.70 million market capitalization.

AU Optronics Corp. (NYSE:AUO) shares advanced 3.34 percent to $8.36 in post market trading session.

Losers:

Northstar Realty Finance Corp. (NYSE:NRF) shares slumped 8.94 percent to $4.28 in aftermarket trading session. The company announced the pricing of an underwritten public offering of 15 million shares of its common stock at a public offering price of $4.25 per share.

Iamgold Corp. (NYSE:IAG) shares declined 2.55 percent to $18.71 in aftermarket trading session as the company lowered its gold production guidance. For the full year, the company lowered its total gold production guidance to a range of 0.95 million to 1.05 million ounces compared to its prior estimation of 1.1 million to 1.2 million ounces. Its first quarter net income rose to $162.3 million or $0.41 per share compared to $60.2 million or $0.15 per share in the same quarter last year.

NetQin Mobile Inc. (NYSE:NQ) shares declined 2.47 percent to $7.8 in post market trading session.

Silvercorp Metals Inc. (NYSE:SVM) shares declined 2.2 percent to $10.65 in aftermarket trading session. The company reported fourth quarter net income of $12.6 million or $0.07 per share compared to $9.8 million or $0.06 per share in the same quarter last year.

Talisman Energy Inc. (NYSE:TLM) shares declined 1.96 percent to $21.00 in post market trading session.

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