The top after-market NYSE gainers on Wednesday are: Polypore International, Miller Industries, Phoenix Companies, Navigant Consulting, Tetra Technologies, Helix Energy Solutions Group, Healthspring, Vonage Holdings, Petrohawk Energy and CACI International.

Polypore International Inc. (NYSE:PPO) shares climbed 9.72 percent to $60.75 in aftermarket trading session. Its first quarter net profit surged to $25.8 million or $0.55 per share from $14.1 million or $0.31 per share in the same quarter last year. Net sales rose to $185.7 million, while analysts’’ expected net income of $0.40 per share on revenue of $164.38 million.

Miller Industries, Inc. (NYSE:MLR) shares gained 6.06 percent to $16.80 in post market trading session. The company reported first quarter net income of $0.61 per share compared to $0.17 per share in the same quarter last year. Revenue rose to $108.9 million against analysts’ estimation of $91.81 million.

Phoenix Companies, Inc. (NYSE:PNX) shares gained 5.47 percent to $2.70 in aftermarket trading session. The stock has a 52 week low of $1.61 and 52 week high of $3.83 and has $297.76 million market capitalization.

Navigant Consulting, Inc. (NYSE:NCI) shares gained 5.11 percent to $10.91 in post market trading session.

Tetra Technologies, Inc. (NYSE:TTI) shares advanced 4.97 percent to $13.52 in aftermarket trading session. The company stock declined 4.73 percent in regular trading session.

Helix Energy Solutions Group, Inc. (NYSE:HLX) shares gained 4.54 percent to $17.73 in aftermarket trading session. The stock has a 52 week low of $8.38 and 52 week high of $19.20 and has $1.8 billion market capitalization.

Healthspring, Inc. (NYSE:HS) shares gained 4.29 percent to $43.27 in post market trading session. Herbert A Fritch, Chairman & CEO of HS, sells 7,500 shares of HS on May 5 at an average price of $41.55 a share.

Vonage Holdings Corp. (NYSE:VG) shares gained 3.98 percent to $4.96 in post market trading session. Its first quarter net income rose to $21.11 million or $0.09 per share from $13.97 million or $0.06 per share in the same quarter last year.

Petrohawk Energy Corp. (NYSE:HK) shares advanced 3.79 percent to $24.95 in post market trading session.

CACI International, Inc. (NYSE:CACI) shares gained 3.66 percent to $61.75 in aftermarket trading session. The company reported first quarter net income of $36.4 million or $1.16 per share for the third quarter compared to $26.7 million or $0.87 per share in the same quarter last year. CACI also raised its fiscal 2011 earnings estimate to 4.15 to 4.30 per share from 4.05 to 4.20 per share.

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