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.
Seagen, With Two Big Pharma Bidders, Nearly Lost Both
Seagen was being pursued by another prospective big pharma buyer when it engaged Pfizer in merger negotiations, but both bidders walked away in late summer 2022; Pfizer returned in January.

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