The top after-market NYSE gainers on Monday are: Helmerich & Payne, Camelot Information Systems, Penn Virginia, Astoria Financial, Monster Worldwide, Masco Corp, Western Digital and Elan Corp.

Helmerich & Payne, Inc. (NYSE:HP) shares climbed 7.38 percent to $52.25 in post market trading session. The stock has a 52 week low of $35.56 and 52 week high of $73.40 and has $5.21 billion market capitalization.

Camelot Information Systems Inc. (NYSE:CIS) shares surged 7.25 percent to $5.47 in aftermarket trading session. The company stock plunged more than 10 percent in regular trading session.

Penn Virginia Corp. (NYSE:PVA) shares gained 6.88 percent to $8.70 in post market trading session.

Astoria Financial Corp. (NYSE:AF) shares advanced 6.147 percent to $9.68 in post market trading session. The company stock was upgraded to “hold” rating from “sell” rating at Stifel Nicolaus.

Monster Worldwide, Inc. (NYSE:MWW) shares advanced 5.75 percent to $7.54 in post market trading session. The stock has a 52 week low of $7.08 and 52 week high of $25.90 and has $921.06 million market capitalization.

Masco Corp. (NYSE:MAS) shares gained 5.5 percent to $7.87 in aftermarket trading session.

Western Digital Corp. (NYSE:WDC) shares gained 4.98 percent to $27.83 in post market trading session. The stock has a 52 week low of $23.06 and 52 week high of $41.87 and has $6.18 billion market capitalization.

Elan Corp, plc (NYSE:ELN) shares advanced 4.71 percent to $9.08 in aftermarket trading session. The stock has a 52 week low of $4.25 and 52 week high of $12.60 and has $5.49 billion market capitalization.

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