The pharmaceutical company's new CEO formerly worked for the Canadian company, long a rumored suitor.
Elan is upgraded to 'market perform,' and Affymax is downgraded to 'neutral.'
The biotech was rumored to be a takeover target but aims to be a buyer instead.
Riverbed is downgraded at 2 firms, and Activision Blizzard is upgraded to 'outperform.'
The month also features a big gathering of biotech CEOs in New York and a cancer research meeting in Florida.
Stocks add to earlier gains as Fed announces plans to continue stimulus measures.
Teva is downgraded to 'market perform,' and Under Armour is initiated with an 'underweight.'
Stocks are mixed in a lackluster trading session, with the Dow the leader and the Nasdaq the laggard.
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