The top after-market NASDAQ stock market gainers are: Danvers Bancorp, Intuitive Surgical, Clinical Data, Polycom, SinoTech Energy, and Google. The top after-market NASDAQ stock market losers are: Morgans Hotel Group, Seattle Genetics, Matrixx Initiatives, Synaptics, and DealerTrack Holdings.

Gainers

Danvers Bancorp Inc. (DNBK) stock advanced 29.26 percent to $22 in the after-market trading, following its cash and stock deal to be acquired by People's United Financial, Inc. (PBCT) for $23 a share or total consideration of about $493 million. The transaction is expected to close late in the second quarter of 2011. Danvers shareholders can elect to receive either $23.00 in cash, or 1.624 shares of People's United Financial stock for each Danvers Bancorp share held.

Shares of Intuitive Surgical, Inc. (ISRG) soared 12.04 percent to $324.72 in the after-hours trading, following its better-than-expected fourth quarter earnings. Profit was $121 million or $3.02 a share, up from $78 million or $1.95 a share last year. Revenue rose 21 percent to $389.3 million, on continued robotic procedure adoption and higher da Vinci Surgical System sales. Analysts had expected profit of $2.24 a share on revenue of $367.65 million.

Clinical Data, Inc. (CLDA) stock gained 9.10 percent to $16.19 in the after-market session.

Shares of Polycom, Inc. (PLCM) increased 8.83 percent to $41.55 in the after-hours session, following its better-than-expected fourth quarter earnings. Adjusted profit was $43.2 million or 49 cents a share, up from $28.4 million or 33 cents a share last year. Revenue rose to $339.6 million from $267.9 million. Analysts had expected profit of 43 cents a share on revenue of $327.45 million.

SinoTech Energy Ltd. (CTE) stock rose 5.15 percent to $8.50 in the after-market trading.

Shares of Google Inc. (GOOG) gained 1.31 percent to $635 in the after-hours trading, following its better-than-expected fourth quarter earnings and appointment of Larry Page as chief executive officer. Adjusted profit was $2.9 billion or $8.75 a share, up from $2.2 billion or $6.79 a share last year. Revenue rose 26 percent to $8.4 billion. Excluding traffic acquisition costs, revenue grew about 29 percent to $6.4 billion. Analysts had expected profit of $8.09 a share on revenue of $6.06 billion.

In addition, Google said its co-founder, Larry Page, will take charge of the company's day-to-day operations as chief executive officer effective April 4, replacing Eric Schmidt who will assume the role of executive chairman. Google's Co-Founder Sergey Brin would devote to strategic projects, in particular working on new products. Internally, Schmidt would continue to act as an advisor to Larry and Sergey.

Google said in an SEC filing that Schmidt has established a stock trading plan, allowing him to sell 534,000 shares of Class A common stock over the next year. If Schmidt completes all the planned sales under this trading plan, his stake in Google would be reduced to 2.7 percent from 2.9 percent.

Losers

Shares of Morgans Hotel Group Co. (MHGC) lost 4.51 percent to $8.84 in the after-hours trading.

Seattle Genetics Inc. (SGEN) stock fell 3.18 percent to $15.23 in the after-market trading.

Shares of Matrixx Initiatives Inc. (MTXX) declined 2.95 percent to $8.22 in the after-hours session, following a loss in third quarter. Loss was $11.3 million or $1.21 a share, compared to profit of $3.8 million or $0.41 a share last year. Sales declined 29 percent to $20.3 million. The company expects full year revenue to increase 3 percent to 5 percent above $67.3 million revenue achieved in fiscal 2010.

Synaptics Inc. (SYNA) stock decreased 2.56 percent to $31.23 in the after-market session. Adjusted profit for second quarter was $25.4 million or 72 cents a share, up from $21.7 million or 62 cents a share last year. Revenue rose 20 percent to $159.6 million. Analysts had expected profit of 68 cents a share on revenue of $158.34 million. The company expects third quarter revenue of $136 million to $146 million, while analysts project $135.74 million.

Shares of DealerTrack Holdings, Inc. (TRAK) moved down 2.53 percent to $20.80 in the after-hours trading.

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