Seagen reaches out to Pfizer On May 19, the Seagen board decided to approach Pfizer about a potential acquisition, followed by a call between a board representative and Pfizer CEO Albert Bourla. The next day a Pfizer executive conveyed that Pfizer had been assessing Seagen "for some time," according to the filing, and was interested in exploring a deal. Pfizer's first offer and another suitor Pfizer provided a written proposal to Seagen on June 1 with a proposed acquisition price of $210 to $220 in cash per share.