The top aftermarket NYSE gainers Wednesday were: McKesson Corp, YPF SA, Jaguar Mining, EXCO Resources and 3D Systems Corp. The top aftermarket NYSE losers were: Barnes & Noble, Muller Water Products, Cloud Peak Energy, Manning & Napier and Lexington Realty Trust.

Gainers

McKesson Corp. (MCK) shares surged 4.07 percent to $91.48 in aftermarket session. The company announced that it has been selected by the Department of Veterans Affairs (VA) to continue as the VA's prime pharmaceutical supplier.

YPF SA (YPF) shares surged 3.03 percent to $21.75 in post market session. The company stock plunged 5 percent in regular trading session on news that Argentina's government plans to seize control of the oil firm.

Jaguar Mining Inc. (JAG) shares gained 2.82 percent to $3.64 in aftermarket session. The company stock slumped more than 23 percent in regular trade.

EXCO Resources NL (XCO) shares rose 2.35 percent to $6.09 in post market session. The stock has a 52-week low of $5.90, a 52-week high of $21.03 and $1.29 billion in market capitalization.

3D Systems Corp. (DDD) shares advanced 1.73 percent to $23.50 in post market trading after gaining nearly 3 percent in regular session.

Losers

Barnes & Noble, Inc. (BKS) shares plunged 3.41 percent to $11.33 in aftermarket session.

Muller Water Products, Inc. (MWA) shares declined 2.30 percent to $3.35 in post market session. The company stock climbed more than 7 percent in regular session after announcing that it plans to release financial results for its second quarter ended March 31, 2012 on Tuesday, May 1, 2012.

Cloud Peak Energy Inc. (CLD) shares fell 2.26 percent to $14.70 in post market session.

Manning & Napier, Inc. (MN) shares declined 1.55 percent to $13.80 in aftermarket session.

Lexington Realty Trust (LXP) shares fell 1.38 percent to $8.31 in post market session. The stock has a 52-week low of $5.71, a 52-week high of $10.14 and $1.31 billion in market capitalization.

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