Biogen closes Apellis deal, pairing two marketed drugs with a nephrology-focused expansion
Biogen completed its all-cash acquisition of Apellis Pharmaceuticals, making Apellis a wholly owned subsidiary and adding the marketed therapies EMPAVELI and SYFOVRE to Biogen’s portfolio, which together generated $689 million in net product revenue in 2025. The deal was financed via a tender offer at $41 per share plus a contingent value right, with about 82% of Apellis shares tendered. Biogen expects the acquisition to be accretive to non-GAAP diluted EPS in 2027 and to enhance long-term growth through nephrology expansion, including felzartamab’s first Phase 3 readout for antibody-mediated rejection in kidney transplant patients in 2027. Updated guidance will be provided with Biogen’s Q2 earnings in July.
