The top after-market NYSE gainers Tuesday were AuRico Gold Inc, SuperValu Inc, Mistras Group Inc, Yum! Brands, Inc and Radioshack Corp. The top after-market NYSE losers were Ferro Corp, CommonWealth REIT, ESCO Technologies Inc, Cummins Inc and Lexington Realty Trust.

Gainers

AuRico Gold Inc. (AUQ) shares climbed 7.79 percent to $6.92 in post-market trading. The company announced Tuesday that it had entered into a definitive agreement pursuant to which Minera Frisco would acquire the Ocampo mine and the adjacent exploration projects "Venus" and "Los Jarros," all located in Chihuahua State, Mexico, and a 50 percent interest in the Orion advanced development project located in Nayarit State for a total cash consideration of $750 million.

SuperValu Inc. (SVU) shares surged 5.13 percent to $2.05 in post-market trading. The company stock slumped more than 11 percent in regular trading.

Mistras Group Inc. (MG) shares surged 4.78 percent to $24.10 in post-market trading after the company raised its full-year revenue outlook. The company currently expects fiscal 2013 revenue to be in a range of $520 to $535 million, up from prior estimate of $495 to $520 million and also topped analysts’ estimate of $517.75 million.

Yum! Brands, Inc. (YUM) shares gained 4.03 percent to $68.70 in post-market trading. The company reported the third quarter net income of $471 million or $1.00 per share, up from $383 million or $0.80 per share quarter last year.

Radioshack Corp. (RSH) shares gained 3 percent to $2.40 in post-market trading. The company stock climbed more than 12 percent in regular trading after it was upgraded to a “buy” rating from an “underperform” rating at Bank of America Corp.

Losers

Ferro Corp. (FOE) shares tumbled 8.54 percent to $3.32 in post-market trading after the company lowered the full-year earnings guidance. The company currently expects the fiscal 2012 adjusted net profit between $0.07 and $0.12 per share, down from its prior estimate of $0.15 to $0.20 per share and also fell short of Reuters’ estimate of $0.17 per share.

CommonWealth REIT (CWH) shares plunged 7.85 percent to $13.73 in post-market trading after the company announced a new quarterly Common Share dividend rate of $0.25 per share.

ESCO Technologies Inc. (ESE) shares plunged 6.25 percent to $35.26 in post-market trading. The company announced Tuesday that it expected the fiscal 2012 pretax earnings would be approximately $8.7 million lower than previously communicated, resulting in earnings of $1.70 to $1.73 per share.

Cummins Inc. (CMI) shares fell 4.78 percent to $86.50 in post-market trading after lowering its full-year revenue guidance. The company currently expects the fiscal 2012 revenue will be approximately $17 billion, down from its prior estimate of $18 billion. 

Lexington Realty Trust (LXP) shares fell 4.18 percent to $9.40 in post-market trading. The company announced Tuesday that it commenced an underwritten registered public offering of 15,000,000 common shares.