BIIB Institutional Ownership
Top institutional (13F) holders of BIIB and activist (13D/G) positions, sourced from SEC EDGAR.
Institutional owners
43
Institutional value
$23.29B
Top holder
FMR LLC
Activist holders
3
Top holders
| Holder | Filed | Value |
|---|---|---|
| FMR LLCinvestment advisor | Aug 13, 2026 | $3.94B |
| BlackRock, Inc.holding company | Aug 7, 2026 | $3.45B |
| PRIMECAP MANAGEMENT CO/CA/hedge fund | Aug 14, 2026 | $3.27B |
| Vanguard Capital Managementhedge fund | Aug 13, 2026 | $2.09B |
| STATE STREET CORPinvestment advisor | Aug 7, 2026 | $1.59B |
| Vanguard Portfolio Managementhedge fund | Aug 13, 2026 | $1.43B |
| GEODE CAPITAL MANAGEMENT, LLCinvestment advisor | Aug 12, 2026 | $957.94M |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisor | Aug 14, 2026 | $673.56M |
| Norges Bankother | Aug 12, 2026 | $557.44M |
| MORGAN STANLEYinvestment advisor | Aug 13, 2026 | $520.98M |
| AQR CAPITAL MANAGEMENT LLCinvestment advisor | Aug 14, 2026 | $416.93M |
| JPMORGAN CHASE & COinvestment advisor | Aug 12, 2026 | $394.95M |
| Invesco Ltd.investment advisor | Aug 14, 2026 | $389.76M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisor | Aug 14, 2026 | $355.99M |
| UBS Group AGinvestment advisor | Aug 13, 2026 | $331.30M |
| NORTHERN TRUST CORPinvestment advisor | Aug 13, 2026 | $308.86M |
| GOLDMAN SACHS GROUP INCinvestment advisor | Aug 14, 2026 | $274.48M |
| Dimensional Fund Advisors LPhedge fund | Aug 11, 2026 | $248.17M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisor | Aug 14, 2026 | $241.48M |
| BANK OF AMERICA CORP /DE/investment advisor | Aug 14, 2026 | $241.17M |
| CITADEL ADVISORS LLCinvestment advisor | Aug 14, 2026 | $187.44M |
| CITIGROUP INCinvestment advisor | Aug 3, 2026 | $175.19M |
| PRICE T ROWE ASSOCIATES INC /MD/investment advisor | Aug 14, 2026 | $167.29M |
| Bank of New York Mellon Corpholding company | Aug 6, 2026 | $167.15M |
| Massachusetts Financial Services Companyhedge fund | Aug 3, 2026 | $163.13M |
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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.