BIIB Institutional Ownership
Top institutional (13F) holders of BIIB and 5%+ (13D/G) positions, sourced from SEC EDGAR.
Institutional owners
54
Institutional value
$24.06B
Top holder
FMR LLC
Top holders
| Holder | Stake | Filed | Value |
|---|---|---|---|
| FMR LLCinvestment advisor | 12.3% | Aug 13, 2026 | $3.94B |
| BlackRock, Inc.holding company | 10.8% | Aug 7, 2026 | $3.45B |
| PRIMECAP MANAGEMENT CO/CA/investment advisor | 10.3% | Aug 14, 2026 | $3.27B |
| Vanguard Capital Managementinvestment advisor | 6.5% | Aug 13, 2026 | $2.09B |
| STATE STREET CORPORATIONholding company | 5.0% | Sep 22, 2026 | $1.59B |
| Vanguard Portfolio Managementinvestment advisor | 4.5% | Aug 13, 2026 | $1.43B |
| GEODE CAPITAL MANAGEMENT, LLCinvestment advisor | 3.0% | Nov 6, 2026 | $1.01B |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisor | 2.1% | Aug 14, 2026 | $673.56M |
| Norges Bankother | 1.7% | Aug 12, 2026 | $557.44M |
| MORGAN STANLEYholding company | 1.6% | Aug 13, 2026 | $520.98M |
| AQR CAPITAL MANAGEMENT LLCinvestment advisor | 1.3% | Aug 14, 2026 | $416.93M |
| JPMORGAN CHASE & COholding company | 1.2% | Aug 12, 2026 | $394.95M |
| Invesco Ltd.holding company | 1.2% | Aug 14, 2026 | $389.76M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisor | 1.1% | Aug 14, 2026 | $355.99M |
| UBS Group AGbank | 1.0% | Aug 13, 2026 | $331.3M |
| NORTHERN TRUST CORPinvestment advisor | 1.0% | Aug 13, 2026 | $308.86M |
| GOLDMAN SACHS GROUP INCinvestment advisor | 0.9% | Aug 14, 2026 | $274.48M |
| Boston Partnersinvestment advisor | 0.9% | Aug 4, 2026 | $272.85M |
| Dimensional Fund Advisors LPinvestment advisor | 0.8% | Nov 4, 2026 | $261.59M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisor | 0.8% | Aug 14, 2026 | $241.48M |
| BANK OF AMERICA CORP /DE/holding company | 0.8% | Aug 14, 2026 | $241.17M |
| CITADEL ADVISORS LLCinvestment advisor | 0.6% | Sep 1, 2026 | $187.44M |
| CITIGROUP INCinvestment advisor | 0.5% | Nov 4, 2026 | $173.49M |
| Bank of New York Mellon Corpholding company | 0.5% | Nov 5, 2026 | $171.63M |
| FRED ALGER MANAGEMENT, LLCinvestment advisor | 0.5% | Aug 14, 2026 | $170.32M |
5%+ holders
Current stakes of 5% or more from Schedule 13D and 13G filings. A joint filing shows once, under its lead filer.
| Holder | Form | Stake | Filed |
|---|---|---|---|
| FMR LLCinvestment advisorwith Abigail P. Johnson | SC 13G/A | 12.4% | Aug 6, 2026 |
| VANGUARD CHESTER FUNDS - VANGUARD PRIMECAP FUND 23-2311375mutual fund | SC 13G/A | 5.3% | Feb 13, 2006 |
| PRIMECAP MANAGEMENT CO/CA/investment advisor | SC 13G/A | 10.2% | Nov 14, 2025 |
| BlackRock, Inc.holding company | SC 13G/A | 8.5% | Apr 17, 2025 |
| Vanguard Capital Managementinvestment advisor | SC 13G | 7.5% | Apr 29, 2026 |
| STATE STREET CORPORATIONholding company | SC 13G | 5.0% | Nov 10, 2025 |
Institutional ownership for companies related to BIIB
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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.