Take a look at some of Monday's midday movers:
Pfizer climbed on news its experimental breast cancer drug succeeded in a mid-stage trial.
FireEye declined after filing a $700 million secondary offering.
Twitter gained after RBC Capital and Wedbush expressed optimism about the company's fourth-quarter and 2014 outlook.
AOL rose after Needham raised its price target to $57 from $46 a share.
Herbalife fell. Investor William Ackman charged that the supplement seller found new distributors through a business that had been convicted in Canada of operating a pyramid scheme.
Ryanair Holdings gained after the Irish airline reported strong forward bookings and an easing of intense price competition among European airlines.
Altria Group declined. The company buying electronic cigarette company Green Smoke for $110 million.
Medivation fell after Needham and Bernstein cut their ratings on the stock.
Valeant Pharmaceuticals International declined after it agreed to buy privately held PreCision Dermatology for $475 million in cash.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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