The last few weeks have seen a lot of acquisition activity among large pharmaceutical companies.
First, Pfizer announced in January that it would acquire Wyeth for approximately $68 billion. This month saw three more mergers: Merck & Co.’s $41.1 billion purchase of Schering-Plough Corp., Roche’s $46.8 billion purchase of Genentech and Gilead Science’s purchase of CV Therapeutics.