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Schedule 13G/A

BIIB Schedule 13G/A filing by Fidelity / FMR

Fidelity / FMR reported beneficial ownership of 12.8K shares, representing 12% of BIOGEN INC in this filing.

FiledMay 6, 2026
Ownership dateMar 31, 2026
Reported shares12.8K
Reported ownership12%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 11.5K
Shared voting power 12.8K
Sole dispositive power 12.8K
Shared dispositive power 12.8K
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$190.68as of May 6, 2026
Latest tracked price$208.45as of Aug 4, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Fidelity / FMR
CIK
CIK0000315066
Accession
0000315066-26-001103
Form
Schedule 13G/A
Open SEC filing View BIIB ownership history
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.

How to read a Schedule 13G → Does a 13G mean the shares were just bought? → Filing date vs. ownership date →