The top aftermarket NYSE gainers Friday were: PHH Corp, American Greetings, Veolia Environnement, EQT Corp, ENSCO, MetroPCS Communications, Ivanhoe Mines, Pengrowth Energy, Fusion-io and Piedmont Office Realty Trust.

PHH Corp. (NYSE:PHH) shares surged 6.27 percent to $11.18 in aftermarket trading session. The company stock plunged more than 5 percent in regular trading session. Earlier this week S&P lowered the company's long-term credit rating to 'BB-' from 'BB+' and said PHH may not be able to meet some of its debt obligations.

 American Greetings Corp. (NYSE:AM) shares gained 2.08 percent to $13.25 in aftermarket trading session. The company stock plunged more than 3 percent in regular trading session.

Veolia Environnement (NYSE:VE) shares gained 1.81 percent to $11.25 in aftermarket trading session. The stock has a 52-week low of $10.15, a 52-week high of $33.86 and $5.58 billion in market capitalization.

EQT Corp. (NYSE:EQT) shares advanced 1.27 percent to $56.68 in post market trading session.

ENSCO plc (NYSE:ESV) shares advanced 1.13 percent to $49.34 in post market trading session. The stock has a 52-week low of $37.39, a 52-week high of $60.31 and $11.25 billion in market capitalization.

MetroPCS Communications, Inc. (NYSE:PCS) shares advanced 1.06 percent to $8.26 in aftermarket trading session. The company stock declined nearly 3 percent in regular trading session.

Ivanhoe Mines Ltd. (NYSE:IVN) shares advanced 1.04 percent to $18.18 in post market trading session.

Pengrowth Energy Corp. (NYSE:PGH) shares gained 1.01 percent to $11 in aftermarket trading session. The stock has a 52-week low of $7.99, a 52-week high of $14.60 and $3.59 billion in market capitalization.

Fusion-io, Inc. (NYSE:FIO) shares gained 1.01 percent to $27.05 in aftermarket trading session. The company stock was upgraded to “neutral” rating from “underperform” rating at Sterne Agee.

Piedmont Office Realty Trust, Inc. (NYSEARCA:PDM) shares advanced 0.99 percent to $17.59 in post market trading session.