The top after-market NYSE gainers Friday were Dominion Resources Black Warrior Trust, Thompson Creek Metals Co, MPG Office Trust, Renren Inc and Overseas Shipholding Group. The top after-market NYSE losers were Alon USA Energy, HudBay Minerals, Heckmann Corp, Plantronics and RadioShack Corp.

Gainers

Dominion Resources Black Warrior Trust (DOM) stock climbed 24.31 percent to $6.80 in post-market trading.

Thompson Creek Metals Co, Inc. (TC) shares gained 2.13 percent to $2.88 in post-market trading. The company stock climbed more than 12 percent in regular trading after it was upgraded to "buy" rating by Dahlman Rose.

MPG Office Trust, Inc. (MPG) shares advanced 2 percent to $3.57 in post-market trading after surging more than 5 percent in regular trading.

Renren Inc. (RENN) shares rose 1.57 percent to $3.89 in post-market trading. The stock has a 52-week low of $3.21, a 52-week high of $7.87 and $1.46 billion in market capitalization.

Overseas Shipholding Group, Inc. (OSG) shares advanced 1.33 percent to $6.09 in post-market trading.

Losers

Alon USA Energy, Inc. (ALJ) shares plunged 2.56 percent to $13.33 in post-market trading. ALJ's limited partnership unit Alon USA Partners LP filed with the U.S. regulators to raise up to $230 million in an initial public offering of its common units, Reuters reported.

HudBay Minerals Inc. (HBM) shares declined 1.73 percent to $8.39 in post-market trading. The company stock surged more than 4 percent in regular trading.

Heckmann Corp. (HEK) shares declined 1.49 percent to $2.65 in post-market trading.

Plantronics, Inc. (PLT) shares declined 1.29 percent to $35.20 in post-market trading. The stock has a 52-week low of $27.12, a 52-week high of $40.82 and $1.51 billion in market capitalization.

RadioShack Corp. (RSH) shares fell 1.28 percent to $2.40 in post-market trading. Barclays Capital lowered RSH's fiscal 2012 earnings estimate to -$0.30 per share from -$0.20 per share.