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Trader sentiment on Pfizer is surging

Pfizer signage is displayed on a monitor on the floor of the New York Stock Exchange.
Michael Nagle | Bloomberg | Getty Images

Bullish mentions of Pfizer stock on Twitter dramatically increased in the past week after the company announced a large deal.

Social Market Analytics, which scans posts on social networks to form predictive trading signals, found that Pfizer had the biggest jump in bullish mentions among major U.S. stocks in the last week.

Pfizer on Monday announced a $14 billion deal to acquire Medivation, a biotech company focused on cancer drugs. Shares of the pharmaceutical giant were up 9 percent year to date as of Tuesday's close. If the data are any indication, traders are betting the run will continue.

Below are the top five stocks seeing the biggest one-week jump in bullish sentiment on Twitter, according to SMA.