The top after-market NYSE gainers on Tuesday are: Select Medical Holdings, Cai International, Endeavour Silver, Sturm, Ruger & Co, Eastman Kodak, Vaalco Energy, Canon, K-V Pharmaceutical, Motorola Solutions and Silvercorp Metals.

Select Medical Holdings Corp. (NYSE:SEM) shares climbed 9.73 percent to $9.25 in post market trading session. The company expects first quarter earnings to be in the range of $0.21 to $0.22 per share on revenue of $685 - $695 million. Select Medical also reaffirmed its earnings forecast for fiscal 2011. Analysts’ expects first quarter net income of $0.17 per share on revenue of $669.64 million.

Cai International, Inc. (NYSE:CAP) shares gained 3.09 percent to $27.65 in aftermarket trading session. The company reported first net income of $0.65 per share compared to $0.17 per share in the same quarter last year.

Endeavour Silver Corp. (NYSE:EXK) shares gained 3 percent to $10.98 in post market trading session. The company plans to release its first quarter 2011 financial results on Thursday May 5, 2011 before the opening bell.

Sturm, Ruger & Co, Inc. (NYSE:RGR) shares advanced 2.58 percent to $21.49 in after market trading session. The company reported first quarter net income of $7.95 million or $0.42 per share compared to $8.32 million or $0.43 per share in the same quarter last year, while analysts’ expected net income of $0.39 per share for the first quarter.

Eastman Kodak Co. (NYSE:EK) shares advanced 2.53 percent to $3.24 in aftermarket trading session. The stock has a 52 week low of $2.9 and 52 week high of $9.08 and has $850.16 million market capitalization.

Vaalco Energy Inc. (NYSE:EGY) shares advanced 2.5 percent to $7.38 in post market trading session.

Canon, Inc. (NYSE:CAJ) share advanced 2.22 percent to $44.20 in after market trading session.

K-V Pharmaceutical Co. (NYSE:KV.A) shares gained 2.19 percent to $4.03 in aftermarket trading session.

Motorola Solutions Inc (NYSE: MSI) shares gained 2.14 percent to $44.41 in aftermarket trading session. Jefferies & Co. reiterated its hold rating on shares of Motorola ahead of first quarter earnings results, with a price target of $43.

Silvercorp Metals Inc. (NYSE:SVM) shares advanced 2.12 percent to $13.48 in post market trading session. The company stocks plunged 4.97 percent in the regular trading session.

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