The top after-market NYSE gainers on Monday are: Dex One, Swift Energy, Ashford Hospitality, Calix and Lorillard. The top after-market NYSE losers are: Youku.com, iStar Financial, Warnaco Group, Clear Channel and Excel Maritime Carriers.

Gainers

Dex One Corp. (NYSE:DEXO) shares surged 8.92 percent to $5.74 in post market trading session on Monday. Its shares plunged 8.19 percent in regular trading session.

Swift Energy Co. (NYSE:SFY) shares climbed 7.64 percent to $46.23 in aftermarket trading session. Its shares slumped 7.09 percent in regular trading session after the company stock was downgraded to “hold” from “buy” rating at Jefferies.

Ashford Hospitality Trust Inc. (NYSE:AHT) shares advanced 7.45 percent to $11.08 in post market trading session.

Calix, Inc. (NYSE:CALX) shares advanced 7.42 percent to $19.11 in aftermarket trading session. The stock has a 52 week low of $9.57 and 52 week high of $20.80 and has $664.86 million market capitalization.

Lorillard, Inc. (NYSE:LO) shares gained 5.61 percent to $77.29 and has $11.17 billion market capitalization. The stock has a 52 week low of $70.24 and 52 week high of $89.71 and has $664.86 million market capitalization.

Losers

Youku.com Inc. (NYSE:YOKU) shares plunged 10.72 percent to $37.13 in aftermarket trading session as its fourth quarter earnings missed analysts’ estimates. The company reported a loss of $0.13 per American depositary share against analysts’ estimation of $0.03 per American depositary share.

iStar Financial Inc. (NYSE:SFI) shares declined 5.31 percent to $9.46 in post market trading session. The stock has a 52 week low of $2.70 and 52 week high of $10.08 and has $922.27 million market capitalization.

Warnaco Group Inc. (NYSE:WRC) shares declined 4.45 percent to $56.10 in aftermarket trading session after the company guided 2011 earnings in the range of $3.85 to $4.05 per share against analysts’ estimation of $4.10 per share.

Clear Channel Outdoor Holdings, Inc. (NYSE:CCO) shares declined 4.27 percent to $14.11 in aftermarket trading session.

Excel Maritime Carriers, Ltd. (NYSE:EXM) shares declined 4.21 percent to $5.0 in post market trading session. The company reported fourth quarter net income of $63.6 million or $0.76 per share compared to $81.8 million or $1.00 per share in the same quarter last year. Revenue declined 15 percent to $158 million mainly hurt by a volatile freight environment.