Constellation Brands Inc, Anheuser-Busch InBev, Vonage Holdings Corp, Quiksilver Inc, Generac Holdings Inc, Weight Watchers International Inc, CenturyLink and Tripadvisor Inc are among the companies whose shares are moving in the pre-market trading Thursday.

Shares of Constellation Brands Inc (NYSE:STZ) advanced 13.71 percent to $36.25 and the shares of Anheuser-Busch InBev (NYSE: BUD) rose 3.93 percent to $91.73 in pre-market trading after both the companies Thursday announced a revised agreement that establishes Crown Imports as the number three producer and marketer of beer in the U.S. through a complete divestiture of Grupo Modelo's U.S. business.

Vonage Holdings Corp (NYSE:VG) stock advanced 4.91 percent to $3.40 in pre-market trading. The company announced Thursday the financial results for the fourth quarter and the full year ending Dec 31, 2012. The company said it entered into a new $145-million credit agreement to provide increased financial flexibility for investments.

Quiksilver Inc (NYSE:ZQK) stock rose 5.30 percent to $6.76 in pre-market trading. The company shares have a 52-week low of 2.09, a 52-week high of $6.83 and a market capitalization of $1.07 billion.

Generac Holdings Inc (NYSE:GNRC) shares climbed 4.63 percent to $41.10 in pre-market trading. The company reported the fourth quarter financial earnings which showed that adjusted net income, excluding certain items, increased 17.1 percent over the prior year quarter to $60.7 million, and adjusted net income per share increased 15.3 percent to $0.87.

Weight Watchers International Inc (NYSE:WTW) shares slumped 16.84 percent to $45.00 in pre-market trading. The stocks declined after the company reported the financial earnings and gave its full year forecast below the analysts’ expectations. The global-branded consumer company and a provider of weight management services said it expected the full-year earnings of $3.5 to $4.0 per share.

CenturyLink Inc (NYSE:CTL) shares fell 15.18 percent to $35.36 in post-market trading. The company stock has a 52-week low of $3.60, a 52-week high of $9.50 and $65.51 million in market capitalization.

Tripadvisor Inc (NASDAQ:TRIP) declined 10.45 percent to $42.00 in pre-market trading. The shares were down despite the company reporting its fourth quarter profit and revenue (year-on-year) that beat the analysts’ expectation as the revenue for the quarter decreased 20.37 percent from $212.71 million in the previous quarter. EPS decreased 36.96 percent from $0.46 sequentially.