The top after-market NYSE gainers Wednesday were: Teekay Tankers, GFI Group, Star Gas Partners, EnerSys and Hovnanian Enterprises. The top after-market NYSE losers were: Energy Transfer Partners, New York Times, US Airways Group, Weatherford International and Terex Corp.

Gainers:

Teekay Tankers Ltd. (TNK) shares surged 2.12 percent to $4.52 in post market trading after gaining more than 5 percent in regular trading.

GFI Group Inc. (GFIG) shares surged 5.08 percent to $3.72 in post market trading.

Star Gas Partners, L.P. (SGU) shares rose 3.18 percent to $4.22 in post market trading. The stock has a 52-week low of $3.65, a 52-week high of $5.41 and $250.92 million in market capitalization.

EnerSys (ENS) shares rose 2.02 percent to $32.79 in post market trading. The stock has a 52-week low of $17.35, a 52-week high of $36.48 and $1.54 billion in market capitalization.

Hovnanian Enterprises Inc. (HOV) shares rose 1.77 percent to $2.87 in post market trading. The company stock surged more than 5 percent in regular trading as home builder shares gained after Lennar Corp. (LEN) reported better-than-expected second quarter earnings.

Losers:

Energy Transfer Partners LP (ETP) shares plunged 3.68 percent to $44.29 in post market trading. The company announced Wednesday that it has commenced a public offering of 13,500,000 common units representing limited partner interests, with a 30-day option for the underwriters to purchase up to an additional 2,025,000 common units.

New York Times Co. (NYT) shares fell 2.90 percent to $7.20 in post market trading. The company stock climbed more than 8 percent in regular trading.

US Airways Group, Inc. (LCC) shares declined 2.33 percent to $13.00 in post market trading. US Airways and Croatia Airlines Wednesday announced a new bilateral codeshare agreement, under which US Airways' customers will enjoy expanded service to destinations in Croatia and the convenience of a single-ticket purchase for a seamless travel experience.

Weatherford International, Ltd. (WFT) shares declined 2.17 percent to $11.97 in post market trading. The company stock surged more than 4 percent in regular trading.

Terex Corp. (TEX) shares fell 2.01 percent to $16.11 in post market trading. The stock has a 52-week low of $9.30, a 52-week high of $29.87 and $1.81 billion in market capitalization.

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