The top after-market NYSE gainers on Monday are: Hexcel Corp, Aaron's, Inc, Capital Trust, Hospira, Helix Energy Solutions, Helix Energy Solutions Group, AK Steel Holding, ITT Educational Services, Jaguar Mining, United Parcel Service and Valero Energy.

Hexcel Corp. (NYSE:HXL) shares surged 7.97 percent to $21.14 in aftermarket trading session after the company said its first quarter profit surged 67 percent over the last year. Profit was $25.3 million or $0.25 a share, up from $14.5 million or $0.15 a share last year. Hexcel expects fiscal 2011 earnings to be in the range of $0.95 to $1.05 per share against analysts’ estimation of $0.96 per share.

Aaron's, Inc. (NYSE:AAN) shares advanced 4.05 percent to $27 in post market trading session. The company reported first quarter net income of $44.4 million or $0.55 per share compared to $37.0 million or $0.45 per share in the same period last year.

Capital Trust, Inc. (NYSE:CT) shares gained 3.7 percent to $4.20 in aftermarket trading session. The company stock climbed 9.76 percent in regular trading session.

Hospira Inc. (NYSE:HSP) shares advanced 3.2 percent to $59.99 in post market trading session. The company announced that its board of directors has authorized the repurchase of up to $1 billion of the Company's common stock.

Helix Energy Solutions Group, Inc. (NYSE:HLX) shares advanced 2.66 percent to $17.00 in post market trading session. The company swung to first quarter net income of $25.9 million or $0.24 per share compared to a net loss of $17.9 million or $0.17 per share in the same period last year.

AK Steel Holding Corp. (NYSE:AKS) shares advanced 2.13 percent to $16.28 in aftermarket trading session. The company is expected to report first quarter net loss of $0.01 per share before markets open of Tuesday.

ITT Educational Services, Inc. (NYSE:ESI) shares gained 2.08 percent to $74.13 in aftermarket trading session.

Jaguar Mining Inc. (NYSE:JAG) shares advanced 1.99 percent to $5.742 in aftermarket trading session. The company stock plunged 5.39 percent in regular trading session.

United Parcel Service, Inc. (NYSE:UPS) shares gained 1.78 percent to $74.95 in post market trading session. The company is expected to report first quarter net income of $0.85 per share compared to $0.71 per share in the same quarter last year.

Valero Energy Corp. (NYSE:VLO) shares gained 1.68 percent to $29.60 in post market trading session. The company is expected to report first quarter net income of $ 0.30 per share on Tuesday.

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