Biogen Inc.
BIIB- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0000875045
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, Q1 2026
Institutional positions in Biogen Inc. as of Mar 31, 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
- Institutional holders
- 1,014
- +33 vs. Q4 2025
- Shares held
- 135.0M
- +15.4M (+12.9%) vs. Q4 2025
- Total value
- $24.7B
- +$3.70B (+17.6%) vs. Q4 2025
- New holders
- 138
- 401 more added
- Sold out
- 105
- 290 more reduced
20 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: 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.
| 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, Q1 2026
Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Adams Diversified Equity Fund, Inc. | 100,300 | $18.4M | 0.65% | +56,000+126.4% | Added |
| American Century Companies Inc | 104,783 | $19.2M | 0.01% | +18,959+22.1% | Added |
| Woodline Partners LP | 109,032 | $20.0M | 0.08% | +6,714+6.6% | Added |
| Rhenman & Partners Asset Management AB | 109,100 | $20.0M | 2.47% | +16,750+18.1% | Added |
| New York State Teachers Retirement System | 111,303 | $20.4M | 0.04% | +100+0.1% | Added |
| Susquehanna Portfolio Strategies, LLC | 111,830 | $20.5M | 0.30% | +5,716+5.4% | Added |
| DekaBank Deutsche Girozentrale | 108,721 | $20.7M | 0.03% | 00.0% | Unchanged |
| Canada Pension Plan Investment Board | 114,938 | $21.1M | 0.01% | −23,140−16.8% | Reduced |
| LMR Partners LLP | 116,131 | $21.3M | 0.20% | +107,501+1,245.7% | Added |
| Quantinno Capital Management LP | 116,374 | $21.3M | 0.04% | +18,041+18.3% | Added |
| Creative Planning | 117,236 | $21.5M | 0.01% | +27,234+30.3% | Added |
| Portolan Capital Management, LLC | 118,481 | $21.7M | 1.16% | +33,491+39.4% | Added |
| Great West Life Assurance Co | 121,723 | $22.4M | 0.04% | +18,623+18.1% | Added |
| State Board of Administration of Florida Retirement System | 124,212 | $22.8M | 0.04% | −1,538−1.2% | Reduced |
| Wells Fargo & Company | 127,134 | $23.3M | 0.00% | +7,796+6.5% | Added |
| TD Asset Management Inc | 127,268 | $23.3M | 0.02% | −8,084−6.0% | Reduced |
| Eurizon Capital SGR S.p.A. | 129,204 | $23.7M | 0.07% | −1,609−1.2% | Reduced |
| Ameriprise Financial Inc | 132,603 | $24.3M | 0.01% | +842+0.6% | Added |
| Russell Investments Group, Ltd. | 135,841 | $25.1M | 0.03% | +16,754+14.1% | Added |
| Citadel Advisors LLC | 138,093 | $25.3M | 0.02% | +97,669+241.6% | Added |
| Susquehanna International Group, LLP | 140,299 | $25.7M | 0.03% | −521,385−78.8% | Reduced |
| Palo Alto Investors LP | 140,719 | $25.8M | 3.95% | −42,852−23.3% | Reduced |
| O'Shaughnessy Asset Management, LLC | 141,324 | $25.9M | 0.13% | +31,056+28.2% | Added |
| Panagora Asset Management Inc | 142,065 | $26.0M | 0.10% | +138,862+4,335.4% | Added |
| Franklin Resources Inc | 144,448 | $26.5M | 0.01% | +3,074+2.2% | Added |
| Letko, Brosseau & Associates Inc | 150,865 | $27.7M | 0.45% | +21,085+16.2% | Added |
| Standard Life Aberdeen plc | 151,144 | $27.7M | 0.04% | +11,266+8.1% | Added |
| ExodusPoint Capital Management, LP | 151,993 | $27.9M | 0.28% | +151,993 | New |
| Ieq Capital, LLC | 152,076 | $27.9M | 0.13% | +12,437+8.9% | Added |
| Prudential Financial Inc | 163,887 | $30.0M | 0.04% | −189,606−53.6% | Reduced |
| Allianz Asset Management GmbH | 178,049 | $32.6M | 0.04% | −69,673−28.1% | Reduced |
| Principal Financial Group Inc | 187,059 | $34.3M | 0.02% | +2,870+1.6% | Added |
| SG Americas Securities, LLC | 195,668 | $35.9M | 0.04% | +11,839+6.4% | Added |
| KLP Kapitalforvaltning AS | 199,177 | $36.5M | 0.14% | +7,500+3.9% | Added |
| Logos Global Management LP | 200,000 | $36.7M | 1.89% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 201,367 | $36.9M | 0.22% | −20,493−9.2% | Reduced |
| Renaissance Technologies LLC | 203,396 | $37.3M | 0.06% | −195,800−49.0% | Reduced |
| Alliancebernstein L.P. | 212,897 | $37.5M | 0.01% | +29,153+15.9% | Added |
| Qube Research & Technologies Ltd | 212,921 | $39.0M | 0.06% | +212,921 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 215,436 | $39.5M | 0.05% | −30,244−12.3% | Reduced |
| California State Teachers Retirement System | 220,687 | $40.5M | 0.04% | −5,693−2.5% | Reduced |
| Sofinnova Investments, Inc. | 229,521 | $42.1M | 2.11% | +229,521 | New |
| Marshall Wace, LLP | 229,879 | $42.1M | 0.05% | −156,049−40.4% | Reduced |
| KBC Group NV | 234,692 | $43.0M | 0.11% | +181,294+339.5% | Added |
| Thompson Siegel & Walmsley LLC | 248,343 | $45.5M | 0.80% | +19,536+8.5% | Added |
| Acadian Asset Management LLC | 248,489 | $45.5M | 0.06% | +61,032+32.6% | Added |
| Vanguard Asset Management, Ltd | 249,778 | $45.8M | 0.04% | +249,778 | New |
| Kames Capital plc | 258,735 | $47.4M | 0.63% | −1,427−0.5% | Reduced |
| Rhumbline Advisers | 275,438 | $50.5M | 0.04% | +3,692+1.4% | Added |
| Causeway Capital Management LLC | 280,783 | $51.5M | 0.63% | −240,318−46.1% | Reduced |
| Swedbank AB | 289,840 | $53.1M | 0.06% | +58,231+25.1% | Added |
| Gotham Asset Management, LLC | 298,437 | $54.7M | 0.17% | +21,628+7.8% | Added |
| Fisher Asset Management, LLC | 312,618 | $57.3M | 0.02% | +19,349+6.6% | Added |
| FIL Ltd | 318,056 | $58.3M | 0.05% | −1,488−0.5% | Reduced |
| Man Group plc | 318,745 | $58.4M | 0.12% | −20,539−6.1% | Reduced |
| Victory Capital Management Inc | 320,785 | $58.8M | 0.04% | +74,135+30.1% | Added |
| Adage Capital Partners GP, L.L.C. | 333,457 | $61.1M | 0.09% | +39,100+13.3% | Added |
| LSV Asset Management | 333,739 | $61.2M | 0.13% | +16,924+5.3% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 334,413 | $61.3M | 0.04% | +14,504+4.5% | Added |
| California Public Employees Retirement System | 340,903 | $62.5M | 0.04% | +10,097+3.1% | Added |
| Vanguard Global Advisers, LLC | 343,768 | $63.0M | 0.03% | +343,768 | New |
| Sumitomo Mitsui Trust Holdings, Inc. | 356,291 | $65.3M | 0.04% | −14,336−3.9% | Reduced |
| Nuveen, LLC | 358,838 | $65.8M | 0.02% | −16,719−4.5% | Reduced |
| Patient Capital Management, LLC | 379,741 | $69.6M | 2.60% | −196,611−34.1% | Reduced |
| Candriam Luxembourg S.C.A. | 381,768 | $70.0M | 0.36% | +51,296+15.5% | Added |
| National Pension Service | 401,667 | $73.6M | 0.06% | +114,429+39.8% | Added |
| Swiss National Bank | 430,600 | $78.9M | 0.05% | +28,800+7.2% | Added |
| HSBC Holdings PLC | 463,652 | $84.6M | 0.05% | −40,180−8.0% | Reduced |
| BNP Paribas Arbitrage, SA | 471,068 | $86.4M | 0.06% | −36,999−7.3% | Reduced |
| Citigroup Inc | 500,507 | $91.8M | 0.06% | −73,337−12.8% | Reduced |
| Caisse de Depot Et Placement du Quebec | 518,694 | $95.1M | 0.15% | −69,851−11.9% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 522,155 | $95.7M | 0.21% | +69,713+15.4% | Added |
| UBS Group AG | 523,450 | $96.0M | 0.02% | −118,338−18.4% | Reduced |
| Royal Bank of Canada | 531,377 | $97.4M | 0.02% | −10,448−1.9% | Reduced |
| Barclays PLC | 551,474 | $101.1M | 0.04% | −753,533−57.7% | Reduced |
| Artemis Investment Management LLP | 571,571 | $104.8M | 1.11% | +344,726+152.0% | Added |
| AustralianSuper Pty Ltd | 616,193 | $113.0M | 0.59% | +139,381+29.2% | Added |
| Balyasny Asset Management LLC | 650,046 | $119.2M | 0.23% | +42,093+6.9% | Added |
| Pacer Advisors, Inc. | 660,408 | $121.1M | 0.35% | −485,482−42.4% | Reduced |
| Price T Rowe Associates Inc | 672,427 | $123.3M | 0.01% | −119,644−15.1% | Reduced |
| First Trust Advisors LP | 673,958 | $123.6M | 0.09% | +108,111+19.1% | Added |
| Employees Provident Fund Board | 704,196 | $129.1M | 0.98% | 00.0% | Unchanged |
| Massachusetts Financial Services Co | 720,629 | $133.7M | 0.05% | +8,070+1.1% | Added |
| Fred Alger Management, LLC | 733,194 | $134.4M | 0.59% | −65,580−8.2% | Reduced |
| Robeco Institutional Asset Management B.V. | 763,174 | $139.9M | 0.20% | +152,266+24.9% | Added |
| Bank of New York Mellon Corp | 788,523 | $144.6M | 0.03% | −22,583−2.8% | Reduced |
| Amundi | 790,827 | $145.0M | 0.04% | +218,398+38.2% | Added |
| Alyeska Investment Group, L.P. | 805,050 | $147.6M | 0.42% | −219,218−21.4% | Reduced |
| Point72 Asset Management, L.P. | 809,617 | $148.4M | 0.26% | −2,003,575−71.2% | Reduced |
| Vanguard Fiduciary Trust Co | 825,531 | $151.3M | 0.04% | +825,531 | New |
| Pictet Asset Management Holding SA | 913,328 | $168.3M | 0.18% | −34,166−3.6% | Reduced |
| Goldman Sachs Group Inc | 1,051,094 | $192.7M | 0.03% | −48,272−4.4% | Reduced |
| Deutsche Bank AG | 1,063,828 | $195.0M | 0.06% | +110,100+11.5% | Added |
| Dimensional Fund Advisors LP | 1,079,119 | $197.9M | 0.04% | +118,474+12.3% | Added |
| Van Eck Associates Corp | 1,079,861 | $198.0M | 0.15% | +14,245+1.3% | Added |
| Charles Schwab Investment Management Inc | 1,149,394 | $210.7M | 0.03% | +5,492+0.5% | Added |
| Bank of America Corp | 1,156,369 | $212.0M | 0.02% | +27,524+2.4% | Added |
| T. Rowe Price Investment Management, Inc. | 1,160,989 | $212.8M | 0.15% | −9,918−0.8% | Reduced |
| Legal & General Group Plc | 1,349,832 | $247.5M | 0.06% | −109,765−7.5% | Reduced |
| UBS Asset Management Americas Inc | 1,377,568 | $252.5M | 0.05% | −13,802−1.0% | Reduced |