Biogen Inc.

BIIB

Exchange: Nasdaq
Industry: Biological Products, (No Diagnostic Substances)
SEC CIK: 0000875045

SEC filings (opens in a new tab)

In the last 90 days, Biogen Inc. insiders filed 0 open-market purchases and 1 sale; 1,046 institutions reported holding it in 13F filings for Q2 2026, worth $30.7B in total; no superinvestor holds it.

13F holders, Q3 2026

Institutional positions in Biogen Inc. as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 11; +1 vs. Q2 2026
Shares held: 10.5K; +854 (+8.9%) vs. Q2 2026
Total value: $2.37M; +$288.4K (+13.8%) vs. Q2 2026
New holders: 1; 4 more added
Sold out: 0; 2 more reduced

1,036 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting BIIB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding BIIB and their total value by quarter
Quarter	Holders	Value
Q2 2026	1,046	$30.7B
Q1 2026	1,014	$24.7B
Q4 2025	1,001	$24.6B
Q3 2025	908	$18.4B
Q2 2025	867	$16.3B
Q1 2025	882	$17.7B
Q4 2024	879	$20.2B
Q3 2024	921	$25.1B
Q2 2024	947	$29.9B
Q1 2024	955	$28.0B
Q4 2023	1,005	$33.3B
Q3 2023	966	$32.2B
Q2 2023	1,009	$36.1B
Q1 2023	1,004	$35.0B
Q4 2022	1,033	$34.6B
Q3 2022	987	$33.0B
Q2 2022	930	$25.0B
Q1 2022	954	$25.9B
Q4 2021	1,014	$29.7B
Q3 2021	1,044	$35.1B
Q2 2021	1,107	$43.6B
Q1 2021	1,096	$35.7B

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q2 2026.

Institutions holding BIIB in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Ieq Capital, LLC	–	–	–	–	Not filed
Thompson Siegel & Walmsley LLC	–	–	–	–	Not filed
Lord, Abbett & Co. LLC	–	–	–	–	Not filed
Acadian Asset Management LLC	–	–	–	–	Not filed
Adage Capital Partners GP, L.L.C.	–	–	–	–	Not filed
Wells Fargo & Company	–	–	–	–	Not filed
Standard Life Aberdeen plc	–	–	–	–	Not filed
Bank of Montreal	–	–	–	–	Not filed
Great West Life Assurance Co	–	–	–	–	Not filed
State Board of Administration of Florida Retirement System	–	–	–	–	Not filed
American Century Companies Inc	–	–	–	–	Not filed
T. Rowe Price Investment Management, Inc.	–	–	–	–	Not filed
Woodline Partners LP	–	–	–	–	Not filed
Raymond James Financial Inc	–	–	–	–	Not filed
Aviva PLC	–	–	–	–	Not filed
New York State Teachers Retirement System	–	–	–	–	Not filed
National Bank of Canada	–	–	–	–	Not filed
Eurizon Capital SGR S.p.A.	–	–	–	–	Not filed
Adams Diversified Equity Fund, Inc.	–	–	–	–	Not filed
New York State Common Retirement Fund	–	–	–	–	Not filed
Integral Health Asset Management, LLC	–	–	–	–	Not filed
Illinois Municipal Retirement Fund	–	–	–	–	Not filed
Susquehanna Portfolio Strategies, LLC	–	–	–	–	Not filed
Federated Hermes, Inc.	–	–	–	–	Not filed
Van Eck Associates Corp	–	–	–	–	Not filed
APG Asset Management N.V.	–	–	–	–	Not filed
Sphera Funds Management Ltd.	–	–	–	–	Not filed
LPL Financial LLC	–	–	–	–	Not filed
Rhenman & Partners Asset Management AB	–	–	–	–	Not filed
DekaBank Deutsche Girozentrale	–	–	–	–	Not filed
STRS Ohio	–	–	–	–	Not filed
Handelsbanken Fonder AB	–	–	–	–	Not filed
Ameriprise Financial Inc	–	–	–	–	Not filed
Manufacturers Life Insurance Company, The	–	–	–	–	Not filed
Hudson Bay Capital Management LP	–	–	–	–	Not filed
Point72 Asset Management, L.P.	–	–	–	–	Not filed
Mariner, LLC	–	–	–	–	Not filed
Antipodes Partners Ltd	–	–	–	–	Not filed
Mackenzie Financial Corp	–	–	–	–	Not filed
Mitsubishi UFJ Trust & Banking Corp	–	–	–	–	Not filed
Freestone Grove Partners LP	–	–	–	–	Not filed
SEI Investments Co	–	–	–	–	Not filed
State of Wisconsin Investment Board	–	–	–	–	Not filed
Cerity Partners LLC	–	–	–	–	Not filed
Renaissance Technologies LLC	–	–	–	–	Not filed
Vanguard Investments Australia, Ltd.	–	–	–	–	Not filed
D. E. Shaw & Co., Inc.	–	–	–	–	Not filed
Cinctive Capital Management LP	–	–	–	–	Not filed
Prudential Financial Inc	–	–	–	–	Not filed
Susquehanna International Group, LLP	–	–	–	–	Not filed
Chevy Chase Trust Holdings, Inc.	–	–	–	–	Not filed
Universal- Beteiligungs- und Servicegesellschaft mbH	–	–	–	–	Not filed
Farallon Capital Management, L.L.C.	–	–	–	–	Not filed
Envestnet Asset Management Inc	–	–	–	–	Not filed
Erste Asset Management GmbH	–	–	–	–	Not filed
Danske Bank A/S	–	–	–	–	Not filed
Banque Pictet & Cie SA	–	–	–	–	Not filed
Royal London Asset Management Ltd	–	–	–	–	Not filed
Asset Management One Co.,Ltd.	–	–	–	–	Not filed
Toroso Investments, LLC	–	–	–	–	Not filed
HealthInvest Partners AB	–	–	–	–	Not filed
Credit Agricole S A	–	–	–	–	Not filed
OrbiMed Advisors LLC	–	–	–	–	Not filed
Cresset Asset Management, LLC	–	–	–	–	Not filed
Mirae Asset Global Investments Co., Ltd.	–	–	–	–	Not filed
TD Asset Management Inc	–	–	–	–	Not filed
Lazard Asset Management LLC	–	–	–	–	Not filed
Edmond de Rothschild Holding S.A.	–	–	–	–	Not filed
Nomura Asset Management Co Ltd	–	–	–	–	Not filed
Sector Gamma AS	–	–	–	–	Not filed
Gateway Investment Advisers LLC	–	–	–	–	Not filed
North Growth Management Ltd.	–	–	–	–	Not filed
Andra AP-fonden	–	–	–	–	Not filed
Ethic Inc.	–	–	–	–	Not filed
Martingale Asset Management L P	–	–	–	–	Not filed
QRG Capital Management, Inc.	–	–	–	–	Not filed
Privium Fund Management B.V.	–	–	–	–	Not filed
Tredje AP-fonden	–	–	–	–	Not filed
Silverarc Capital Management, LLC	–	–	–	–	Not filed
SEB Asset Management AB	–	–	–	–	Not filed
State of New Jersey Common Pension Fund D	–	–	–	–	Not filed
Nomura Asset Management International Inc.	–	–	–	–	Not filed
Dakota Wealth Management	–	–	–	–	Not filed
HighTower Advisors, LLC	–	–	–	–	Not filed
Picton Mahoney Asset Management	–	–	–	–	Not filed
Lansforsakringar Fondforvaltning AB (publ)	–	–	–	–	Not filed
Public Employees Retirement System of Ohio	–	–	–	–	Not filed
Toronto Dominion Bank	–	–	–	–	Not filed
Contravisory Investment Management, Inc.	–	–	–	–	Not filed
Resona Asset Management Co.,Ltd.	–	–	–	–	Not filed
State of Michigan Retirement System	–	–	–	–	Not filed
Generali Investments CEE, investicni spolecnost, a.s.	–	–	–	–	Not filed
USS Investment Management Ltd	–	–	–	–	Not filed
CI Private Wealth, LLC	–	–	–	–	Not filed
Mn Services Vermogensbeheer B.V.	–	–	–	–	Not filed
Arizona State Retirement System	–	–	–	–	Not filed
Natixis Advisors, L.P.	–	–	–	–	Not filed
Czech National Bank	–	–	–	–	Not filed
The PNC Financial Services Group, Inc.	–	–	–	–	Not filed
Stifel Financial Corp	–	–	–	–	Not filed