The top pre-market NASDAQ Stock Market gainers are: Netflix, Yahoo!, and Vical. The top pre-market NASDAQ Stock Market losers are: Logitech International, Westport Innovations, Melco Crown Entertainment, Travelzoo, JDS Uniphase, and SodaStream International.

Gainers

Netflix, Inc. (NFLX) stock increased 2.93 percent to $132.26 in the pre-market trading. The company's chief financial officer David Wells said at the 20th Annual Goldman Sachs Communacopia Conference that Netflix is unlikely to go back on prices to win back disgruntled subscribers. Wells said the company would look at several things in the light of the negative reaction that followed the announcement, however, he does not think that going back on prices will win back lost customers.

Yahoo! Inc. (YHOO) stock gained 2.58 percent to $14.32 in the pre-market trading. The investment firm Hellman & Friedman is among the potential bidders for Yahoo, the Dow Jones reported citing people familiar with the situation. Last week, the Wall Street Journal reported that private equity firms Silver Lake Partners and Providence Equity Partners might be interest in the company.

Vical Inc. (VICL) stock rose 1.65 percent to $2.47 in the pre-market trading. The company said the combination of its Allovectin immunotherapy with an anti-CTLA-4 antibody in melanoma mouse model recorded synergistic improvement in efficacy. The study revealed synergistic reduction of tumor growth compared with either treatment alone and provided a positive trend in survival compared with either treatment alone. The study used a standard mouse equivalent of human anti-CTLA-4 antibodies such as ipilimumab. Cohorts included untreated mice, mice treated with Allovectin alone, mice treated with anti-CTLA-4 antibody alone, and mice treated with Allovectin plus anti-CTLA-4 antibody. Allovectin is a systemic immunotherapeutic with a unique mechanism of action that may be complementary to currently approved treatments. It is delivered into a single tumor lesion and immune response are seen in lesions throughout the body.

Losers

Logitech International SA (LOGI) stock plunged 13.96 percent to $7.52 in the pre-market trading. The company lowered its 2012 revenue outlook to about $2.4 billion from previous forecast of about $2.5 billion, while Street analysts predict $2.42 billion. The company also reduced its operating earnings guidance to about $90 million from previous forecast of at least $143 million. The gross margin for the full year is estimated to reach about 33 percent. Gross margin in both third and fourth quarters is expected to be well above full year average.

Westport Innovations Inc. (WPRT) stock fell 9.39 percent to $27.80 in the pre-market trading.

Melco Crown Entertainment Ltd. (MPEL) stock tumbled 6.50 percent to $9.64 in the pre-market trading.

Travelzoo Inc. (TZOO) stock slid 5.81 percent to $26.25 in the pre-market trading.

JDS Uniphase Corp. (JDSU) stock decreased 5.26 percent to $11.80 in the pre-market trading.

SodaStream International Ltd. (SODA) stock declined 5.26 percent to $38.20 in the pre-market trading.