The lofty premium would represent a win for Bioverativ shareholders, including activist hedge-fund manager Alex Denner of Sarissa Capital Management LP, who sits on the boards of Bioverativ and Biogen. A deal for Bioverativ would come a year after Ariad Pharmaceuticals agreed to sell itself to Takeda Pharmaceutical Ltd. for $4.7 billion, or a roughly 75% premium to where Ariad was trading before the deal. Mr. Denner was Ariad's chairman at the time.
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