The top after-market NYSE gainers Thursday were: Vanceinfo Technologies, Denbury Resources, Patriot Coal, McMoRan Exploration and First Tennessee National Corp. The top after-market NYSE losers were: iSoftStone Holdings, Teradata Corp, Leapfrog Enterprises, Hexcel Corp and Kronos Worldwide Inc.

Gainers

Vanceinfo Technologies Inc. (VIT) shares surged 6.79 percent to $12.27 in post-market trading after climbing more than 11 percent in regular trading.

Denbury Resources, Inc. (DNR) shares surged 4.44 percent to $15.75 in post-market trading. The company stock plunged more than 4 percent in regular trading.

Patriot Coal Corp. (PCX) shares surged 4.42 percent to $2.36 in post-market trading. The company stock climbing more than 22 percent in regular trading as coal sector stocks surged due to a heat wave that is blasting much of the United States and causing power plants to run overtime.

McMoRan Exploration Co. (MMR) shares gained 3.73 percent to $13.91 in post-market trading. Analysts at Susquehanna raised price target on shares of MMR to $18 from $14.

First Tennessee National Corp. (FHN) shares advanced 2.28 percent to $8.74 in post-market trading. The stock has a 52-week low of $5.38, a 52-week high of $10.99 and $2.15 billion in market capitalization.

Losers

iSoftStone Holdings Ltd. (ISS) shares plunged 5.89 percent to $6.67 in post-market trading. The company stock climbed more than 13 percent in regular trading.

Teradata Corp. (TDC) shares plunged 3.37 percent to $70.17 in post-market trading. The stock has a 52-week low of $43.19, a 52-week high of $79.34 and $12.25 billion in market capitalization.

Leapfrog Enterprises Inc. (LF) shares declined 3.34 percent to $11.00 in post-market trading. The company announced Thursday that its chief financial officer Mark A. Etnyre has resigned from the company in order to spend more time with his family and pursue personal interests. The resignation will be effective as of October 1, 2012.

Hexcel Corp. (HXL) shares fell 2.95 percent to $25.68 in post-market trading. The stock has a 52-week low of $18.00, a 52-week high of $28.01 and $2.63 billion in market capitalization.

Kronos Worldwide Inc. (KRO) shares declined 2.76 percent to $15.66 in post-market trading. The company stock surged more than 3 percent in regular trading.