Biogen
BIIB · NASDAQ
$243.10+$9.62 (+4.12%)TodayMarket closed ·
Prev close $233.48
Who owns BIIB
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 51.4% of BIIB’s shares.
- Fidelity Management & Research Company LLC10.3%
- PRIMECAP Management Company10.3%
- Vanguard Capital Management, LLC6.5%
- BlackRock Institutional Trust Company, N.A.6.2%
- Next 6 largest institutions18.1%
- All other shareholders48.6%
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Management & Research Company LLC | 15.27M | 10.34% |
| PRIMECAP Management Company | 15.15M | 10.26% |
| Vanguard Capital Management, LLC | 9.65M | 6.53% |
| BlackRock Institutional Trust Company, N.A. | 9.22M | 6.24% |
| State Street Investment Management (US) | 7.34M | 4.97% |
| Vanguard Portfolio Management, LLC | 6.60M | 4.47% |
| Geode Capital Management, L.L.C. | 4.45M | 3.01% |
| Wellington Management Company, LLP | 3.12M | 2.11% |
| Fidelity Institutional Asset Management | 2.61M | 1.77% |
| Norges Bank Investment Management (NBIM) | 2.58M | 1.75% |
Short interest
Settled Sep 30, 2026
- Shares short
- 5.97M
- Days to cover
- 4.87
- % of shares outstanding
- 4.04%
- Average daily volume
- 1.23M
- Change since last report
- +2.5%
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