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Earnings Release
PROPOSED ACQUISITION OF APELLIS INVESTOR WEBCAST
Chief Legal Officer Departure - Susan H. Alexander to Leave Biogen
Material disclosure
Reports Strong Fourth Quarter and Full Year 2025 Results and Provides Full Year 2026 Financial Guidance
Reports Strong Third Quarter 2025 Results and Updates Full Year 2025 Guidance
News
FY 2024
Q3
Q2
Q1
FY 2023
Tender Offer Statement by Issuer
Prospectus Filed Pursuant to Rule 424(b)(2)
S-3ASR
Registration Statement for Securities to be Offered to Employees
Effectiveness Notice
Additional Proxy Materials
Definitive Proxy Statement
PRE 14A
Schedule 13D - Ownership Report
Initial Statement of Beneficial Ownership
Statement of Changes in Beneficial Ownership
Amended Schedule 13G - Ownership Report
Free Writing Prospectus
Definitive Revised Proxy Statement
Post-Effective Amendment to Registration Statement
Correspondence