The top after-market NYSE gainers Thursday were Stone Energy Corp, Western Asset Mortgage Capital Corp, Michael Kors Holdings Ltd, XPO Logistics and Promotora De Informaciones SA. The top after-market NYSE losers were Petrobras Argentina S.A, Blackrock High Income Shares, Steelcase Inc, Monster Worldwide and AuRico Gold Inc.

Gainers

Stone Energy Corp. (SGY) shares rallied 10.40 percent to $28.88 in post-market trading. The company announced Thursday that Kenneth H. Beer, Executive Vice President and Chief Financial Officer, will be presenting at the IPAA Oil & Gas Investment Symposium in San Francisco at 3:35 p.m. PT Monday.

Western Asset Mortgage Capital Corp. (WMC) shares climbed 8.34 percent to $24.16 in post-market trading. The company announced that its Board of Directors had declared a cash dividend of $0.85 per share for the third quarter of 2012 payable on October 25, 2012 to common shareholders of record as of October 1, 2012.

Michael Kors Holdings Ltd. (KORS) shares surged 3.45 percent to $54.30 in post-market trading after the company raised its full-year earnings outlook. The company currently expects fiscal 2013 earnings s to be in a range of $1.39 to $1.41 per share, up from its previous estimation of $1.32 to $1.34 per share and also topped analysts’ estimation of $1.37 per share.

XPO Logistics, Inc. (XPO) shares gained 3.18 percent to $13.30 in post-market trading. The company stock slumped more than 17 percent in regular trading.

Promotora De Informaciones SA (PRIS) shares advanced 2.42 percent to $2.24 in post-market trading.

Losers

Petrobras Argentina S.A. (PZE) shares plunged 4.96 percent to $8.47 in post-market trading.

Blackrock High Income Shares (HIS) shares plunged 3.32 percent to $2.33 in post-market trading.

Steelcase Inc. (SCS) shares declined 2.56 percent to $9.15 in post-market trading. The stock has a 52-week low of $5.40, a 52-week high of $10.50 and $1.18 billion in market capitalization.

Monster Worldwide, Inc. (MWW) shares declined 2.50 percent to $7.80 in post-market trading.

AuRico Gold Inc. (AUQ) shares declined 2.07 percent to $7.07 in post-market trading. The stock has a 52-week low of $5.25, a 52-week high of $11.42 and $2.04 billion in market capitalization.