The top after-market NYSE gainers Wednesday were AAR Corp, Men's Wearhouse, Heckmann Corp, OM Group and Aeroflex Holding Corp. The top after-market NYSE losers were VeriFone Systems, First Bancorp, Sealed Air Corp, Cooper Tire & Rubber and Enbridge Energy Partners, L.P.

Gainers

AAR Corp. (AIR) shares rallied 9.60 percent to $15.99 in post-market trading after the company announced the preliminary results for the first quarter. The company expects the first quarter net profit to be $0.42 to $0.45 per share on revenues of $540 to $550 million, above Reuters' estimate of $0.33 per share on revenues of $525.62 million.

Men's Wearhouse, Inc. (MW) shares climbed 7.13 percent to $34.11 in post-market trading. The company reported the second quarter net profit of $59.4 million or $1.15 per share, up from $57.1 million or $1.09 per share in the same period last year and also topped Reuters' estimation of $1.12 per share.

Heckmann Corp. (HEK) shares climbed 5.68 percent to $4.09 in post-market trading. The company stock was upgraded to "buy" rating from a "hold" rating at Craig Hallum.

OM Group, Inc. (OMG) shares surged 5.60 percent to $18.67 in post-market trading. The company stock plunged more than 5 percent in regular trading after it was downgraded to a "neutral" rating from a "buy" rating.

Aeroflex Holding Corp. (ARX) shares surged 5.17 percent to $7.12 in post-market trading. The company stock plunged nearly 5 percent in regular trading.

Losers

VeriFone Systems, Inc. (PAY) shares slumped 11.02 percent to $31.48 in post-market trading as its full-year earnings guidance fell short of expectations. The company currently expects the fiscal 2012 earnings to be in a range of $2.73 to $2.75 per share on revenues of $1.893 to $1.898 billion compared to analysts' estimate of $2.66 per share on revenues of $1.92 billion.

First Bancorp (FBP) shares plunged 6.76 percent to $3.86 in post-market trading. The company stock climbed more than 7 percent in regular trading.

Sealed Air Corp. (SEE) shares plunged 5.61 percent to $14.12 in post-market trading.

Cooper Tire & Rubber Co. (CTB) shares plunged 4.81 percent to $20.37 in post-market trading. The stock has a 52-week low of $9.64, a 52-week high of $21.58 and $1.33 billion in market capitalization.

Enbridge Energy Partners, L.P. (EEP) shares plunged 4.58 percent to $28.35 in post-market trading. The company announced Wednesday that it had commenced an underwritten public offering of approximately 14 million of its Class A Common Units representing limited partner interests.