The top after-market NYSE gainers on Wednesday are: China Security & Surveillance, SLM Corp, Tempur-pedic International, Yum! Brands and Gardner Denver. The top after-market NYSE losers are: Goodrich Corp, Tele Norte Leste Participacoes, Chipotle Mexican Grill, Elan Corp and General Growth Properties.

Gainers:

China Security & Surveillance Technology Inc. (NYSE:CSR) shares climbed 15.94 percent to $5.60 in aftermarket trading session. The company announced on Wednesday that it has entered into a definitive agreement and plan of merger with Rightmark Holdings Limited.

SLM Corp. (NYSE:SLM) shares surged 6.15 percent to $15.35 in aftermarket trading session after reporting better-than-expected first quarter earnings. Excluding items, core earnings rose to $260 million or $0.48 per share from $215 million or $0.40 per share in the same quarter last year, while analyst expected a net income of $0.40 per share.

Tempur-pedic International Inc. (NYSE:TPX) shares gained 5.83 percent to $63.50 in post market trading session. The stock has a 52 week low of $25.56 and 52 week high of $60.61 and has $4.11 billion market capitalization.

Yum! Brands, Inc. (NYSE:YUM) shares gained 5.74 percent to $5451 in post market trading session after the company said its first quarter profit rose 10 percent from last year. Net income rose to $264 million or $0.54 per share from $241 million or $0.50 per share in the same quarter a year-ago.

Gardner Denver, Inc. (NYSE:GDI) shares advanced 5.48 percent to $83.54 in aftermarket trading session as its first quarter earnings and second quarter earnings outlook topped analysts’ estimates. First quarter net income rose to $59.48 million or $1.13 per share from $31.96 million or $0.61 per share in the same quarter last year.

The company expects second quarter earnings to be in the range of $1.10 to $1.15 per share and also raised its fiscal 2011 earnings guidance to $4.50-$4.60 per share. Analysts expect the company to earn $1.04 for the second quarter and $4.27 for fiscal 2011.

Losers:

Goodrich Corp. (NYSE:GR) shares plunged 6 percent to $82.30 in post market trading session. The company declared a quarterly dividend of 29 cents per share, payable on July 1, 2011 to shareholders of record on June 1, 2011.

Tele Norte Leste Participacoes S.A. (NYSE:TNE) shares declined 3.68 percent to $17.81 in aftermarket trading session. The stock has a 52 week low of $12.87 and 52 week high of $19.22 and has $8.81 billion market capitalization.

Chipotle Mexican Grill, Inc. (NYSE:CMG) shares declined 3.2 percent to $278.88 in aftermarket trading session. The company reported first quarter net income of $1.46 per share compared to $1.19 in the same quarter last year and against analysts’ estimation of $1.44 per share.

Elan Corp, plc (NYSE:ELN) shares declined 3.1 percent to $8.14 in post market trading session. The company swung to first quarter profit of $68.2 million or $0.12 per share compared to a net loss of $6.8 million or $0.01 per share in the same quarter last year.

General Growth Properties, Inc. (NYSE:GGP) shares declined 2.75 percent to $15.20 in aftermarket trading session. The company will release its first quarter 2011 earnings on April 26, 2011.

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