Biogen amends 8-K to drop Apellis deal pro forma financials after reassessing significance

Biogen Inc.

Biogen Inc.

BIIB

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  • Biogen filed an amended Form 8-K to revise disclosures tied to its May 14, 2026 report on the Apellis acquisition.
  • The amendment withdraws the plan to later file Apellis financial statements or merger pro forma financials.
  • Biogen determined the deal was not a “significant” acquisition under Regulation S-X, so those filings are not required.


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