Pfizer Inc. finalized a $43bn deal to buy Seagen Inc. after the antibody-drug conjugate (ADC) specialist approached it, squeezing out a rival that had pursued the company since 2019. The company walked away from the deal altogether at one point but returned to the negotiation table in 2023.
Two companies seriously pursued Seagen in the summer of 2022 and both ended merger negotiations, according to a filing with...








