The top after-market NASDAQ gainers Thursday were: NF Energy Saving, Premier Exhibitions, WD-40, Merge Healthcare, MannKind, Crimson Exploration, Foster Wheeler, Caesars Entertainment and Oncothyreon.

NF Energy Saving Corp. (NFEC) stock surged 3.4 percent to $2.43 in post market session. The company stock climbed nearly 96 percent in regular trade.

Premier Exhibitions, Inc. (PRXI) stock surged 3.28 percent to $2.52 in post market session. The company stock plunged nearly 10 percent in regular trade after announcing that it is extending the auction of its Titanic artifacts collection because of the level of interest and the late entry of extra potential bidders.

WD-40 Co. (WDFC) stock surged 3.17 percent to $46.20 in post market session. The company reported second quarter net income of $10.6 million or $0.65 per share compared to $9 million or $0.53 per share in the same period a year-earlier. Revenue rose to $86 million from $79 million in the same period last year.

For the fiscal 2012, the company currently expects earnings to be in a range of $2.33 to $2.45 per share compared to its prior estimation of $2.28 to $2.40 per share and against analysts'' estimation of $2.35 per share.

Merge Healthcare Inc. (MRGE) stock gained 2.67 percent to $4.99 in aftermarket session. The company stock declined nearly 3 percent in regular trade.

MannKind Corp. (MNKD) stock advanced 2.27 percent to $2.25 in post market trading.

Crimson Exploration Inc. (CXPO) stock gained 1.97 percent to $4.14 in aftermarket session.

Foster Wheeler AG. (FWLT) stock advanced 1.89 percent to $22.92 in aftermarket session. The stock has a 52-week low of $16.40, a 52-week high of $38.74 and $2.42 billion in market capitalization.

Caesars Entertainment Corp. (CZR) stock gained 1.75 percent to $15.68 in aftermarket session. The stock has a 52-week low of $9.00, a 52-week high of $17.90 and $1.93 billion in market capitalization.

Oncothyreon Inc. (ONTY) stock advanced 1.41 percent to $4.32 in post market session.

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