The top after-market NYSE gainers Thursday were: YPF SA, Old Republic International, Tenet Healthcare, JinkoSolar Holding and Valspar Corp. The top after-market NYSE losers were: SandRidge Mississippian, AAR Corp, Regis Corp, WMS Industries and Standard Pacific Corp.

Gainers

YPF SA (YPF) shares climbed 8.90 percent to $11.38 in post-market trading on news that Mexican billionaire Carlos Slim has acquired a 8.4 percent stake in YPF for $288 million.

Old Republic International Corp. (ORI) shares surged 4.75 percent to $10.80 in post-market trading. The stock has a 52-week low of $7.15, a 52-week high of $12.20 and $2.67 billion in market capitalization.

Tenet Healthcare Corp. (THC) shares gained 3.64 percent to $4.84 in post-market trading.

JinkoSolar Holding Company Ltd. (JKS) shares advanced 3.09 percent to $3.92 in post-market trading. The company stock slumped nearly 7 percent in regular trading.

Valspar Corp. (VAL) shares rose 2.46 percent to $48.78 in post-market trading. The stock has a 52-week low of $27.44, a 52-week high of $52.96 and $4.34 billion in market capitalization.

Losers

SandRidge Mississippian Trust I (SDT) shares plunged 5.46 percent to $26.47 in post-market trading.

AAR Corp. (AIR) stock plunged 4.67 percent to $11.03 in post market trading. The company announced Thursday that its Board of Directors authorized AAR Corp to repurchase up to $50 million of its outstanding shares of common stock.

Regis Corp. (RGS) shares declined 2.53 percent to $16.95 in post-market trading. The stock has a 52-week low of $12.46, a 52-week high of $18.91 and $1.00 billion in market capitalization.

WMS Industries Inc. (WMS) shares declined 2.47 percent to $18.93 in post market trading. The company stock advanced more than 2.5 percent in regular trading.

Standard Pacific Corp. (SPF) shares fell 2.43 percent to $4.97 in post-market trading. The company stock climbed 6.5 percent in regular trading.