The top after-market NYSE gainers on Wednesday are: Demand Media, Active Network, Jaguar Mining, China Ming Yang Wind Power and Jones Group. The top after-market NYSE losers are: EnerSys, Alpha Natural Resources, Navistar International, Morgan Stanley and 7 Days Group Holdings.

Gainers:

Demand Media Inc. (NYSE:DMD) shares climbed 15.24 percent to $9.73 in post market trading session. On Tuesday, the company gave a full-year revenue outlook, the upper end of which was above analysts' estimates.

Active Network, Inc. (NYSE:ACTV) shares surged 12.7 percent to $15.00 in aftermarket trading session. The company swung to second quarter net profit of $0.03 per share compared to net loss of $1.26 per share in the same quarter last year.

Jaguar Mining Inc. (NYSE:JAG) shares surged 11.26 percent to $5.73 in post market trading session. The company swung to second quarter net profit of $0.18 per share compared to net loss of $0.17 per share in the same quarter last year.

China Ming Yang Wind Power Group Ltd. (NYSE:MY) shares gained 7.76 percent to $4.06 in post market trading session. The stock has a 52 week low of $3.45 and 52 week high of $14.70 and has $471.25 million market capitalization.

Jones Group, Inc. (NYSE:JNY) shares gained 7.09 percent to $9.97 in aftermarket trading session.

Losers:

EnerSys (NYSE:ENS) shares plunged 6.52 percent to $20.50 in post market trading session. The company reported first quarter net profit of $33.5 million or $0.66 per share compared to $23 million or $0.47 per share in the same quarter last year and against analysts’ estimation of $0.69 per share.

Alpha Natural Resources, Inc. (NYSE:ANR) shares declined 4.19 percent to $27.70 in aftermarket trading session. The stock has a 52 week low of $26.05 and 52 week high of $68.05 and has $6.55 billion market capitalization.

Navistar International Corp. (NYSE:NAV) shares declined 4.05 percent to $36.44 in post market trading session. The company reaffirmed fiscal 2011earnings guidance and expects earnings to be in the range of $5.50 to $6 per share.

Morgan Stanley (NYSE:MS) shares declined 3.3 percent to $22 in post market trading session.

7 Days Group Holdings Ltd. (NYSE:SVN) shares declined 3.28 percent to $16.80 in post market trading session. The stock has a 52 week low of $12.29 and 52 week high of $25.44 and has $287.70 million market capitalization

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