The top aftermarket NYSE gainers Tuesday were: Radian Group, Peabody Energy, MGIC Investment, Tempur-pedic International, Lions Gate Entertainment, Patriot Coal Corp, MagnaChip Semiconductor, MGM Resorts International, Youku and Hovnanian Enterprises Inc.

Radian Group Inc. (NYSE:RDN) shares surged 6.1 percent to $3.13 in post-market trading sessions. The company announced on Tuesday that its financial guarantee insurance subsidiary, Radian Asset Assurance Inc., entered into a three-part transaction with subsidiaries of Assured Guaranty Ltd. that includes the commutation of a $12.9 billion portfolio reinsured by Radian Asset, the ceding of $1.8 billion of public finance business and an agreement to sell Municipal and Infrastructure Assurance Corporation (MIAC) for $91 million, subject to regulatory approval.

Peabody Energy Corp. (NYSE:BTU) shares surged 5.14 percent to $36.86 in aftermarket trading sessions. The company reported fourth quarter net income of $224.1 million or $0.82 per share compared to $210.0 million or $0.77 per share in the same quarter last year.

MGIC Investment Corp. (NYSE:MTG) shares advanced 4.82 percent to $4.35 in aftermarket trading sessions. Its fourth quarter net loss narrowed to $135.3 million or $0.67 per share compared to loss of $186.7 million or $0.93 per share in the same quarter a year ago.

Tempur-pedic International Inc. (NYSE:TPX) shares rose 4.74 percent to $65.20 in aftermarket trading sessions. The company reported fourth quarter net profit of $56.3 million or $0.84 per share compared to $46.3 million or $0.66 per share in the same quarter last year and against analysts’ estimation of $0.82 per share. For fiscal 2012, the company expects earnings to be in a range of $3.80 to $3.95 per share on revenues of $1.60 to $1.65 billion, while analysts expect the company to report earnings per share of $3.77 on revenue of $1.59 billion.

Lions Gate Entertainment Corp. (NYSE:LGF) shares gained 4.62 percent to $10.20 in aftermarket trading sessions. The company stock gained nearly 4 percent in regular trading sessions.

Patriot Coal Corp. (NYSE:PCX) shares advanced 4.07 percent to $8.18 in post-market trading sessions. The stock has a 52-week low of $6.92, a 52-week high of $29.20 and $733.78 million in market capitalization.

MagnaChip Semiconductor Corp. (NYSE:MX) shares gained 3.82 percent to $8.70 in aftermarket trading sessions.

MGM Resorts International (NYSE:MGM) shares rose 3.12 percent to $13.23 in aftermarket trading sessions.

Youku Inc. (NYSE:YOKU) shares gained 3.03 percent to $21.45 in aftermarket trading sessions. The stock has a 52-week low of $13.76, a 52-week high of $69.65 and $2.37 billion in market capitalization.

Hovnanian Enterprises Inc. (NYSE:HOV) shares advanced 2.94 percent to $2.45 in aftermarket trading sessions.