The top aftermarket NYSE gainers Friday were: Teekay Tankers, Armstrong World Industries, CapitalSource, Convergys Corp, Emergent Biosolutions and ExactTarget. The top aftermarket NYSE losers were: China Ming Yang Wind Power Group, HFF, Ion Geophysical Corp, ExamWorks Group, Superior Energy Services and SouFun Holdings.

Gainers:

Teekay Tankers Ltd. (TNK) shares climbed 9.16 percent to $5.72 in aftermarket trading session. The company swung to fourth quarter net loss of $0.5 million or $0.01 per share compared to net profit of $7.80 million or $0.17 per share in the same period a year-ago.

Armstrong World Industries Inc. (AWI) shares surged 3.57 percent to $58.85 in aftermarket session. The company announced Friday that its board of directors has declared a special cash dividend of $8.55 per share payable on April 10, 2012 to shareholders of record as of April 3, 2012.

CapitalSource Inc. (CSE) shares gained 3.52 percent to $7.06 in aftermarket session. The company stock plunged more than 3 percent in regular trading session.

Convergys Corp. (CVG) shares rose 2.86 percent to $14.02 in aftermarket session. The company stock declined nearly 3 percent in regular trading after it was downgraded to “hold” rating from “buy” rating at Stifel Nicolaus.

Emergent Biosolutions, Inc. (EBS) shares advanced 2.70 percent to $16.00 in post market session.

ExactTarget, Inc. (ET) shares gained 2.51 percent to $26.98 in post market trading after surging nearly 5 percent in regular session. The stock has a 52-week low of $22.50, a 52-week high of $29.88 and $1.70 billion in market capitalization.

Losers:

China Ming Yang Wind Power Group Ltd. (MY) shares slumped 10.26 percent to $2.10 in aftermarket trading session. The company announced Friday that it expects fourth quarter revenue is expected to decrease by approximately 53 percent year-over-year, while revenue for full year 2011 is expected to maintain at a similar level as 2010.

HFF, Inc. (HF) shares plunged 5.94 percent to $15.03 in aftermarket session. The company stock climbed more than 6 percent in regular session.

Ion Geophysical Corp. (IO) shares plunged 5.19 percent to $6.21 in post market trading session. The stock has a 52-week low of $4.20, a 52-week high of $13.92 and $1.02 billion in market capitalization.

ExamWorks Group, Inc. (EXAM) shares plunged 4.27 percent to $11.66 in post market session. The company stock surged nearly 5 percent in regular session.

Superior Energy Services, Inc. (SPN) shares fell 4.14 percent to $25.91 in aftermarket session. The stock has a 52-week low of $22.19, a 52-week high of $42.87 and $4.26 billion in market capitalization.

SouFun Holdings Ltd. (SFUN) shares declined 3.84 percent to $18.09 in post market session.

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