The top after-market NYSE gainers Friday were Delek US Holdings, Cenveo, Demand Media, Magnum Hunter Resources and Radioshack Corp. The top after-market NYSE losers were Stillwater Mining, Nationstar Mortgage Holdings, Hovnanian Enterprises, Standard Pacific Corp and SM Energy Co.

Gainers

Delek US Holdings, Inc. (DK) shares surged 3.67 percent to $25.45 in post-market trading. The company stock plunged more than 3 percent in regular trading.

Cenveo Inc. (CVO) shares gained 3.06 percent to $2.02 in post-market trading.

Demand Media Inc. (DMD) shares advanced 2.29 percent to $10.01 in post-market trading. The company announced Friday that it had filed a shelf registration statement on Form S-3 with the Securities and Exchange Commission.

Magnum Hunter Resources Corp. (MHR) shares gained 1.65 percent to $4.30 in post-market trading. The stock has a 52-week low of $2.33, a 52-week high of $7.71 and $711.81 million in market capitalization.

Radioshack Corp. (RSH) shares rose 1.56 percent to $2.60 in post-market trading. The company stock plunged more than 3 percent in regular trading.

Losers

Stillwater Mining Co. (SWC) shares plunged 3.65 percent to $10.25 in post-market trading. The stock has a 52-week low of $7.31, a 52-week high of $15.95 and $1.24 million in market capitalization.

Nationstar Mortgage Holdings Inc. (NSM) shares plunged 2.82 percent to $25.12 in post-market trading. The stock has a 52-week low of $13.00, a 52-week high of $28.75 and $2.30 million in market capitalization.

Hovnanian Enterprises Inc. (HOV) shares fell 2.26 percent to $2.60 in post-market trading.

Standard Pacific Corp. (SPF) shares fell 1.65 percent to $6.55 in post-market trading. The company stock surged more than 4 percent in regular trading.

SM Energy Co. (SM) shares declined 1.52 percent to $46.12 in post-market trading. The stock has a 52-week low of $39.44, a 52-week high of $88.50 and $3.05 million in market capitalization.