The top pre-market NASDAQ stock market losers are: JetBlue Airways, Momenta Pharmaceuticals, Netflix, Pan American Silver, DryShips, NVIDIA, LM Ericsson Telephone, Costco Wholesale, and RF Micro Devices.

JetBlue Airways Corp. (JBLU) plunged 5.17 percent to $6.60 in the pre-market trading. The company's chief financial officer Ed Barnes will meet with investors at the Hudson Securities Airline Conference on Dec. 8. Barnes plans to update investors on the company's recent performance, outlook, and revenue guidance for the fourth quarter.

Momenta Pharmaceuticals Inc. (MNTA) lost 5.11 percent to $14.40 in the pre-market session. The company said it priced an underwritten public offering of 4 million shares of its common stock at $14.35 a share. The offering is expected to close on Dec. 13. The total proceeds, before expenses, to Momenta will be about $57.4 million.

Netflix, Inc. (NFLX) plummeted 1.92 percent to $186.17 in the pre-market trading. The company said its chief financial officer Barry McCarthy is resigning to pursue broader executive opportunities outside Netflix. The company appointed finance veteran David Wells as its chief financial officer, effective Dec. 10.

Brokerage firm Jefferies downgraded its rating on shares of Netflix to 'hold' from 'buy' with a price target of $195. For full story please click here.

Pan American Silver Corp. (PAAS) fell 1.82 percent to $38.77 in the pre-market session.

DryShips, Inc. (DRYS) tumbled 0.83 percent to $5.97 in the pre-market trading.

NVIDIA Corp. (NVDA) dropped 0.47 percent to $14.91 in the pre-market session

LM Ericsson Telephone Co. (ERIC) declined 0.38 percent to $10.58 in the pre-market session. The company said it appointed Jan Wareby new head of Sales And Marketing, effective Jan. 1, 2011.

Jan Wareby is currently Senior Vice President, head of Business Unit Multimedia and member of Ericsson's executive leadership team. The company further noted that the search for Jan Wareby's replacement has started and a new head of Business Unit Multimedia will be announced separately.

Costco Wholesale Corp. (COST) decreased 0.27 percent to $69.45 in the pre-market trading. The company's first quarter profit was $312 million or 71 cents a share, up from $266 million or 60 cents a share last year. Revenue grew to $19.24 billion from $17.3 billion. Analysts had expected profit of 69 cents a share on revenue of $18.81 billion. Comparable store sales rose 7 percent.

RF Micro Devices Inc. (RFMD) moved down 0.13 percent to $7.84 in the pre-market session.

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