The top after-market NYSE gainers on Wednesday are: Niska Gas Storage Partners, K-V Pharmaceutical, First Majestic Silver Corp, Limited Brands and Eastman Kodak Co. The top after-market NYSE losers are: Advance Auto Parts, SouFun Holdings, Heckmann, Pier 1 Imports and Omnicare.

Gainers:

Niska Gas Storage Partners LLC (NYSE:NKA) shares surged 4.83 percent to $21.49 in post market trading session. The company reported Adjusted EBITDA of $195.5 million for the full year ended March 31, 2011 consistent with its previous guidance and against $223.8 million for the fiscal year ended March 31, 2010.

K-V Pharmaceutical Co. (NYSE:KV.A) shares advanced 2.97 percent to $2.77 in aftermarket trading session.

First Majestic Silver Corp. (NYSE:AG) shares gained 2.76 percent to $18.22 in aftermarket trading session. The stock has a 52 week low of $10.32 and 52 week high of $26.88 and has $1.64 billion market capitalization.

Limited Brands, Inc. (NYSE:LTD) shares advanced 2.66 percent to $43.58 in pos market trading session. The company reported first quarter net income of $165.2 million or $0.50 per share compared to $112.5 million or $0.34 per share in the same quarter a year-ago.

Eastman Kodak Co. (NYSE:EK) shares gained 2.5 percent to $3.69 in post market trading session after the company received favorable recommendations from the staff of the U.S. ITC in a patent dispute with Research In Motion and Apple.

Losers:

Advance Auto Parts Inc. (NYSE:AAP) shares plunged 7.3 percent to $65.50 in aftermarket trading session as its first quarter earnings fell short of expectations. The company reported first quarter net income of $109.6 million or $1.35 per share compared to $109.4 million or $1.19 per share in the same quarter last year and against analysts’’ estimation of $1.37 per share.

SouFun Holdings Ltd. (NYSE:SFUN) shares declined 2.28 percent to $21.3 in post market trading session. Goldman Sachs reiterated Buy rating on SFUN and maintained $31 price target.

Heckmann Corp. (NYSE:HEK) shares declined 1.87 percent to $5.77 in aftermarket trading session. The stock has a 52 week low of $3.63 and 52 week high of $6.72 and has $674.89 million market capitalization.

Pier 1 Imports, Inc. (NYSE:PIR) shares declined 1.86 percent to $11.38 in aftermarket trading session.

Omnicare, Inc. (NYSE:OCR) shares declined 1.79 percent to $31.10 in post market trading session. The stock has a 52 week low of $19.14 and 52 week high of $33.01 and has $3.70 billion market capitalization.

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