BIOGEN INC (BIIB) Institutional Ownership and Insiders Activity
BIOGEN INC (BIIB) is widely held by institutional investors, with 1034 firms reporting positions valued at approximately $32.74B based on SEC Form 13F filings for the quarter ended June 30, 2026.
Fmr Llc is the largest disclosed holder, reporting approximately $3.94B in BIIB holdings in its latest filing.
Recent insider activity includes 5 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.
Institutional Holders
1,034
Total Reported Value
$32.74B
Largest Holder
Fmr Llc
Largest Position
$3.94B
Insider Transactions (90d)
5
Latest Filing Quarter
Q2 2026
New Institutional Positions
123
Funds Exiting Positions
114
Top Institutional Owners
View all- Fmr Llc$3.94B
- Blackrock, Inc.$3.45B
- Primecap Management Co/Ca/$3.27B
- Banque Cantonale Vaudoise$2.48B
- Vanguard Capital Management Llc$2.09B
BIIB News
All news- Mh & Associates Securities Management Corp: Q3 2026 Stock Activity Reveals Strategic Shifts
Nov 1, 2026 · valut.ai
- Mark Hillman Q2 2026 Portfolio Activity: Significant Buys & Sells Detailed
Aug 17, 2026 · valut.ai
- Hussman Strategic Advisors Portfolio Shifts in Q2 2026
Aug 5, 2026 · valut.ai
- Mh & Associates Securities Management Corp Activity in Q2 2026: Significant Buys and Sells Observed
Jul 30, 2026 · valut.ai
Related BIIB Institutional Insights:
- BIIB 13F Institutional Holders
- BIIB Superinvestors
- BIIB Institutional Ownership Changes
- Healthcare Sector Institutional Ownership
- Healthcare Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Healthcare Stocks By Institutional Investors
- Most Sold Healthcare Stocks By Institutional Investors
- BIIB Insider Trading & SEC Form 4 Activity
- BIIB Articles
- Top Institutional Investor Stock Rankings