The top aftermarket NYSE gainers on Wednesday were: Xueda Education Group, LyondellBasell Industries, Northstar Realty Finance, Molycorp, Pioneer Natural Resources, Parker Drilling, Safeway, Southwestern Energy, Huntsman Corp and Quicksilver Resources.

Xueda Education Group (NYSE:XUE) shares gained 3.67 percent to $3.67 in post market trading session after gaining more than 10 percent in regular trading session.

LyondellBasell Industries NV (NYSE:LYB) shares advanced 3.42 percent to $29.30 in aftermarket trading session. The company stock plunged more than 4 percent in regular trading session after Morgan Stanley lowered its price target on shares of LYB to $45.00.

Northstar Realty Finance Corp. (NYSE:NRF) shares gained 3.22 percent to $4.17 in post market trading session. The company stock declined more than 4 percent in regular trading session.

Molycorp, Inc. (NYSE:MCP) advanced 1.19 percent to $28.02 in post market trading session. The company stock plunged more than 7 percent in regular trading session.

Pioneer Natural Resources Co. (NYSE:PXD) shares advanced 2.76 percent to $86.39 in post market trading session. The stock has a 52-week low of $58.63, a 52-week high of $106.07 and $9.83 billion in market capitalization.

Parker Drilling Co. (NYSE:PKD) shares gained 2.75 percent to $5.98 in post market trading session. The company stock plunged more than 9 percent in regular trading session as energy stocks fell, Wednesday, after Brazil's national petroleum authority (ANP) announced that it was suspending U.S. oil giant Chevron's drilling rights in the country's territorial waters.

Safeway Inc. (NYSE:SWY) shares advanced 2.61 percent to $18.85 in post market trading session.

Southwestern Energy Co. (NYSE:SWN) shares gained 2.51 percent to $36.52 in post market trading session. The company shares declined along with the other energy stocks in the regular trading session after Brazil's national petroleum authority (ANP) announced that it is suspending U.S. oil giant Chevron's drilling rights in the country's territorial waters.

Huntsman Corp. (NYSE:HUN) shares advanced 2.41 percent to $9.79 in aftermarket trading session. The stock has a 52-week low of $8.13, a 52-week high of $21.52 and $2.27 billion in market capitalization.

Quicksilver Resources Inc. (NYSE:KWK) shares advanced 2.4 percent to $7.25 in aftermarket trading session.

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