The top after-market NASDAQ gainers Thursday were: Cost Plus, Corinthian Colleges, Zoltek Companies, Golar LNG Ltd, Ultratech, KIT digital, Healthways, Freightcar America, Fuel Systems Solutions and American Railcar Industries.

Cost Plus, Inc. (CPWM) stock climbed 7.05 percent to $17.15 in aftermarket trading session. The company reported fourth quarter net profit of $36.5 million or $1.55 per share compared to $28.5 million or $1.23 per share in the same period a year-ago, while analysts' expected net profit of $1.50 per share.

For the first quarter, the company expects net loss to be in a range of $1.6 to $0.8 million or $0.07 to $0.03 per share on revenues of $210 to $214 million, while analysts' expect the company to report net loss of $0.09 per share on revenues of $205.46 million.

Corinthian Colleges, Inc. (COCO) stock surged 4.2 percent to $4.47 in post market trading. The company stock plunged more than 4 percent in regular session.

Zoltek Companies, Inc. (ZOLT) stock surged 4.16 percent to $10.51 in aftermarket session.

Golar LNG Ltd. (GLNG) stock surged 4.14 percent to $39.45 in aftermarket session. The stock has a 52-week low of $22.47, a 52-week high of $47.82 and $3.04 billion in market capitalization.

Ultratech, Inc. (UTEK) stock gained 3.93 percent to $28.33 in aftermarket session. The company stock declined nearly 4 percent in regular session.

KIT digital, Inc. (KITD) stock advanced 3.68 percent to $8.45 in aftermarket session. Investment firm Canaccord Genuity reiterates its buy recommendation on shares of KITD with a price target of $20, more than double to the current market price, Reuters reported.

Healthways, Inc. (HWAY) stock rose 3.49 percent to $7.71 in aftermarket session.

Freightcar America, Inc. (RAIL) stock gained 3.46 percent to $23.65 in aftermarket session. The company announced that it has received, as expected, a notification letter from the Nasdaq Stock Market stating that the Company is no longer in compliance with Nasdaq Marketplace Rule 5250(c)(1), which requires timely filing of SEC periodic reports.

Fuel Systems Solutions, Inc. (FSYS) stock advanced 3.26 percent to $27.84 in aftermarket session. The stock has a 52-week low of $15.35, a 52-week high of $30.59 and $539.58 million in market capitalization.

American Railcar Industries, Inc. (ARII) stock gained 3.21 percent to $25.42 in aftermarket session.