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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

HolderFiledValue
FMR LLCinvestment advisorAug 13, 2026$3.94B
BlackRock, Inc.holding companyAug 7, 2026$3.45B
PRIMECAP MANAGEMENT CO/CA/hedge fundAug 14, 2026$3.27B
Vanguard Capital Managementhedge fundAug 13, 2026$2.09B
STATE STREET CORPinvestment advisorAug 7, 2026$1.59B
Vanguard Portfolio Managementhedge fundAug 13, 2026$1.43B
GEODE CAPITAL MANAGEMENT, LLCinvestment advisorAug 12, 2026$957.94M
WELLINGTON MANAGEMENT GROUP LLPinvestment advisorAug 14, 2026$673.56M
Norges BankotherAug 12, 2026$557.44M
MORGAN STANLEYinvestment advisorAug 13, 2026$520.98M
AQR CAPITAL MANAGEMENT LLCinvestment advisorAug 14, 2026$416.93M
JPMORGAN CHASE & COinvestment advisorAug 12, 2026$394.95M
Invesco Ltd.investment advisorAug 14, 2026$389.76M
SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisorAug 14, 2026$355.99M
UBS Group AGinvestment advisorAug 13, 2026$331.30M
NORTHERN TRUST CORPinvestment advisorAug 13, 2026$308.86M
GOLDMAN SACHS GROUP INCinvestment advisorAug 14, 2026$274.48M
Dimensional Fund Advisors LPhedge fundAug 11, 2026$248.17M
CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisorAug 14, 2026$241.48M
BANK OF AMERICA CORP /DE/investment advisorAug 14, 2026$241.17M
CITADEL ADVISORS LLCinvestment advisorAug 14, 2026$187.44M
CITIGROUP INCinvestment advisorAug 3, 2026$175.19M
PRICE T ROWE ASSOCIATES INC /MD/investment advisorAug 14, 2026$167.29M
Bank of New York Mellon Corpholding companyAug 6, 2026$167.15M
Massachusetts Financial Services Companyhedge fundAug 3, 2026$163.13M

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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.