The top after-market NYSE gainers on Tuesday are: American Realty Investors, Southern Copper Corp, Hovnanian Enterprises, McDermott International and Thompson Creek Metals Co. The top after-market NYSE losers are: Sequans Communications, Magnetek, Gramercy Capital Corp, Armour Residential REIT, Polaris Industries and Inergy, L.P.

Gainers:

American Realty Investors, Inc. (NYSE:ARL) shares climbed 9.68 percent to $2.83 in aftermarket trading session. The company stocks plunged more than 20 percent in the regular trading session.

Southern Copper Corp. (NYSE:SCCO) shares advanced 4.7 percent to $36.18 in post market trading session after declining 5.29 percent in regular trading session.

Hovnanian Enterprises Inc. (NYSE:HOV) shares gained 3.03 percent to $2.72 in aftermarket trading session. The stock has a 52 week low of $2.31 and 52 week high of $6.47 and has $205.82 million market capitalization.

McDermott International, Inc. (NYSE:MDR) shares gained 2.54 percent to $21.76 in post market trading session. The company announced on Tuesday that one of its subsidiaries was awarded a contract by PEMEX Exploración y Producción for procurement, construction and installation of three oil and gas pipelines ranging from 8 to 20 inches in diameter, in Mexico’s Bay of Campeche. The contract is valued at more than US$50 million and will be included in McDermott’s second quarter backlog for 2011.

Thompson Creek Metals Co Inc. (NYSE:TC) shares advanced 2.39 percent to $11.12 in post market trading session.

Losers:

Sequans Communications S.A. (NYSE:SQNS) shares plunged 7.2 percent to $17.79 in aftermarket trading session. The company stock climbed more than 25 percent in regular trading session. The stock has a 52 week low of $7.81 and 52 week high of $19.50 and has $661.78 million market capitalization.

Magnetek, Inc. (NYSE:MAG) shares declined 4.22 percent to $2.22 in post market trading session.

Gramercy Capital Corp. (NYSE:GKK) shares declined 4.14 percent to $2.27 in aftermarket trading session. The stock has a 52 week low of $1.00 and 52 week high of $5.55 and has $118.36 million market capitalization.

Armour Residential REIT, Inc. (NYSE:ARR) shares declined 4.06 percent to $7.33 in post market trading session after the company announced that it is commencing an underwritten public offering of 16,000,000 shares of common stock. ARMOUR expects to grant the underwriters a 30 day option to purchase up to 2,400,000 additional shares of common stock.

Polaris Industries Inc. (NYSE:PII) shares declined 4.03 percent to $105.90 in post market trading session.

Inergy, L.P. (NYSE:NRGY) shares declined 3.48 percent to $35.80 in post market trading session. The company announced the commencement of an underwritten public offering of 9,000,000 common units. It also intends to grant the underwriters the option to purchase up to 1,350,000 additional common units to cover over-allotments, if any.

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