Stock research
BIIB — BIOGEN INC
BIIB is reported by 10 tracked managers with $3.9B in visible reported value. This page connects ownership breadth, filing activity, and price context.
Stock research evidence
The latest visible filing snapshot is 2026 Q2. Values come from reported manager holdings; prices and 52-week context come from the latest available market quote.
- Tracked holders
- 10
- Reported value
- $3.9B
- Ownership breadth
- Not available
- Current price
- $217
Top reported managers
These managers have the largest visible reported positions in BIIB. Portfolio weight is measured within each manager's latest visible filing.
- Primecap1.9% of reported portfolio · $3.3B · Add · Filed Aug 14, 2026
- Cliff Asness0.1% of reported portfolio · $416.9M · Filed Aug 14, 2026
- Ken Griffin0.1% of reported portfolio · $90.4M · Add · Filed Aug 14, 2026
- Samantha McLemore2% of reported portfolio · $61.3M · Reduce · Filed Aug 13, 2026
- Sarah Ketterer0.7% of reported portfolio · $60.1M · Reduce · Filed Aug 13, 2026
Continue the research
Review the manager roster, compare this company with the most widely held stocks, or browse transparent screens built from the same filing-backed data.