The top after-market NYSE gainers on Wednesday are: Janus Capital Group, Complete Production Services, Federated Investors, Dice Holdings and Imperial Holdings. The top after-market NYSE losers are: Advanced Micro Devices, Great Plains Energy, Seadrill, Chesapeake Energy and Continental Resources.

Gainers:

Janus Capital Group, Inc. (NYSE:JNS) shares climbed 8.62 percent to $6.61 in post market trading session. The company stock plunged more than 7 percent in regular trading session.

Complete Production Services, Inc. (NYSE:CPX) shares surged 6.98 percent to $22.26 in aftermarket trading session.

Federated Investors, Inc. (NYSE:FII) shares gained 5.99 percent to $18.73 in aftermarket trading session. The stock has a 52-week low of $16.01, a 52-week high of $28.57 and has $1.84 billion market capitalization.

Dice Holdings, Inc. (NYSE:DHX) shares advanced 5.95 percent to $8.91 in post market trading session.

Imperial Holdings, Inc. (NYSE:IFT) shares gained 5.94 percent to $2.32 in post market trading session. The company stock slumped more than 65 percent in regular trading session on news that several of its employees are under investigation by the U.S.
Attorney's Office, District of New Hampshire, with respect to its life finance business.

Losers:

Advanced Micro Devices, Inc. (NYSE:AMD) shares slumped 8.62 percent to $5.62 in post market trading session after the company lowered its third quarter sales outlook.

For the third quarter, the company expects sales to grow 4 to 6 percent sequentially compared to its earlier estimation of 10 percent growth rate.

Great Plains Energy Inc. (NYSE:GXP) shares plunged 8.57 percent to $72 in aftermarket trading session. The stock has a 52-week low of $16.34, a 52-week high of $21.28 and has $2.64 billion market capitalization.

Seadrill Ltd. (NYSE:SDRL) shares declined 4.18 percent to $27.31 in post market trading session.

Chesapeake Energy Corp. (NYSE:CHK) shares declined 4.13 percent to $27.29 in aftermarket trading session.

Continental Resources, Inc. (NYSE:CLR) shares declined 3.42 percent to $48.97 in post market trading session. The stock has a 52-week low of $44.42, a 52-week high of $73.48 and has $8.84 billion market capitalization.

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