BIIB
BIOGEN INC
Latest close $208.45 as of Aug 4, 2026
Schedule 13G/13D reports beneficial ownership at an observation date. “Accumulation” or “reduction” is inferred
from changes in reported shares when available; it is not a list of individual trades or exact execution prices.
Form 13F rows are quarter-end holding context only and do not establish an exact entry date.
Free access includes current parsed ownership filings, reported share changes, and ownership-percentage changes.
Significance scoring, disclosure-speed analysis, confirmation/divergence signals, and signal alerts require Investor or Pro.
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Beneficial ownership filing history
Showing 3 of 4 parsed filing(s) · 1 older require more history access| Holder | Observed / filed | Reported change | Shares | Ownership | Observation | Filing | Latest |
|---|---|---|---|---|---|---|---|
| Fidelity / FMR CIK0000315066 | May 29, 2026 observed Jun 5, 2026 filed · 7d Schedule 13G amendment | Earliest Schedule 13G amendment found | 16.7K | 12.00% | $196.00 | $195.34 | $208.45 |
| State Street CIK0000093751 | Sep 30, 2025 observed Nov 10, 2025 filed · 41d Initial Schedule 13G | Initial Schedule 13G | 7.3M | 12.00% | $208.45 | ||
| BlackRock Legacy CIK0001364742 | Jul 31, 2024 observed Aug 7, 2024 filed · 7d Schedule 13G amendment | Reported accumulation | 14.6M +400.4K | 10.10% +0.30 pts | $199.78 | $208.45 |