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
- 1,015
- +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
- 402 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 | 1,015 | $24.7B |
| Q4 2025 | 1,002 | $24.6B |
| Q3 2025 | 909 | $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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15,974,601 | $2.93B | 0.05% | +1,163,231+7.9% | Added |
| Primecap Management Co | 14,757,607 | $2.71B | 2.13% | −3900.0% | Reduced |
| FMR LLC | 12,807,541 | $2.35B | 0.12% | +3,381,678+35.9% | Added |
| Vanguard Capital Management LLC | 9,537,417 | $1.75B | 0.04% | +9,537,417 | New |
| State Street Corp | 7,167,922 | $1.31B | 0.05% | +8,902+0.1% | Added |
| Vanguard Portfolio Management LLC | 6,531,727 | $1.20B | 0.06% | +6,531,727 | New |
| Geode Capital Management, LLC | 4,342,602 | $793.4M | 0.05% | +143,203+3.4% | Added |
| Wellington Management Group LLP | 2,961,641 | $543.0M | 0.10% | −589,628−16.6% | Reduced |
| Morgan Stanley | 2,170,940 | $398.0M | 0.02% | −154,073−6.6% | Reduced |
| JPMorgan Chase & Co | 2,016,009 | $378.1M | 0.03% | +158,747+8.5% | Added |
| AQR Capital Management LLC | 1,923,557 | $346.2M | 0.16% | +394,941+25.8% | Added |
| Invesco Ltd. | 1,745,255 | $320.0M | 0.03% | +89,814+5.4% | Added |
| Boston Partners | 1,700,078 | $311.7M | 0.33% | −20,517−1.2% | Reduced |
| Northern Trust Corp | 1,446,579 | $265.2M | 0.04% | +4530.0% | Added |
| UBS Asset Management Americas Inc | 1,377,568 | $252.5M | 0.05% | −13,802−1.0% | Reduced |
| Legal & General Group Plc | 1,349,832 | $247.5M | 0.06% | −109,765−7.5% | Reduced |
| T. Rowe Price Investment Management, Inc. | 1,160,989 | $212.8M | 0.15% | −9,918−0.8% | Reduced |
| Bank of America Corp | 1,156,369 | $212.0M | 0.02% | +27,524+2.4% | Added |
| Charles Schwab Investment Management Inc | 1,149,394 | $210.7M | 0.03% | +5,492+0.5% | Added |
| Van Eck Associates Corp | 1,079,861 | $198.0M | 0.15% | +14,245+1.3% | Added |
| Dimensional Fund Advisors LP | 1,079,119 | $197.9M | 0.04% | +118,474+12.3% | Added |
| Deutsche Bank AG | 1,063,828 | $195.0M | 0.06% | +110,100+11.5% | Added |
| Goldman Sachs Group Inc | 1,051,094 | $192.7M | 0.03% | −48,272−4.4% | Reduced |
| Pictet Asset Management Holding SA | 913,328 | $168.3M | 0.18% | −34,166−3.6% | Reduced |
| Vanguard Fiduciary Trust Co | 825,531 | $151.3M | 0.04% | +825,531 | New |
| Point72 Asset Management, L.P. | 809,617 | $148.4M | 0.26% | −2,003,575−71.2% | Reduced |
| Alyeska Investment Group, L.P. | 805,050 | $147.6M | 0.42% | −219,218−21.4% | Reduced |
| Amundi | 790,827 | $145.0M | 0.04% | +218,398+38.2% | Added |
| Bank of New York Mellon Corp | 788,523 | $144.6M | 0.03% | −22,583−2.8% | Reduced |
| Robeco Institutional Asset Management B.V. | 763,174 | $139.9M | 0.20% | +152,266+24.9% | Added |
| Fred Alger Management, LLC | 733,194 | $134.4M | 0.59% | −65,580−8.2% | Reduced |
| Massachusetts Financial Services Co | 720,629 | $133.7M | 0.05% | +8,070+1.1% | Added |
| Employees Provident Fund Board | 704,196 | $129.1M | 0.98% | 00.0% | Unchanged |
| First Trust Advisors LP | 673,958 | $123.6M | 0.09% | +108,111+19.1% | Added |
| Price T Rowe Associates Inc | 672,427 | $123.3M | 0.01% | −119,644−15.1% | Reduced |
| Pacer Advisors, Inc. | 660,408 | $121.1M | 0.35% | −485,482−42.4% | Reduced |
| Balyasny Asset Management LLC | 650,046 | $119.2M | 0.23% | +42,093+6.9% | Added |
| AustralianSuper Pty Ltd | 616,193 | $113.0M | 0.59% | +139,381+29.2% | Added |
| Artemis Investment Management LLP | 571,571 | $104.8M | 1.11% | +344,726+152.0% | Added |
| Barclays PLC | 551,474 | $101.1M | 0.04% | −753,533−57.7% | Reduced |
| Royal Bank of Canada | 531,377 | $97.4M | 0.02% | −10,448−1.9% | Reduced |
| UBS Group AG | 523,450 | $96.0M | 0.02% | −118,338−18.4% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 522,155 | $95.7M | 0.21% | +69,713+15.4% | Added |
| Caisse de Depot Et Placement du Quebec | 518,694 | $95.1M | 0.15% | −69,851−11.9% | Reduced |
| Citigroup Inc | 500,507 | $91.8M | 0.06% | −73,337−12.8% | Reduced |
| BNP Paribas Arbitrage, SA | 471,068 | $86.4M | 0.06% | −36,999−7.3% | Reduced |
| HSBC Holdings PLC | 463,652 | $84.6M | 0.05% | −40,180−8.0% | Reduced |
| Swiss National Bank | 430,600 | $78.9M | 0.05% | +28,800+7.2% | Added |
| National Pension Service | 401,667 | $73.6M | 0.06% | +114,429+39.8% | Added |
| Candriam Luxembourg S.C.A. | 381,768 | $70.0M | 0.36% | +51,296+15.5% | Added |
| Patient Capital Management, LLC | 379,741 | $69.6M | 2.60% | −196,611−34.1% | Reduced |
| Nuveen, LLC | 358,838 | $65.8M | 0.02% | −16,719−4.5% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 356,291 | $65.3M | 0.04% | −14,336−3.9% | Reduced |
| Vanguard Global Advisers, LLC | 343,768 | $63.0M | 0.03% | +343,768 | New |
| California Public Employees Retirement System | 340,903 | $62.5M | 0.04% | +10,097+3.1% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 334,413 | $61.3M | 0.04% | +14,504+4.5% | Added |
| LSV Asset Management | 333,739 | $61.2M | 0.13% | +16,924+5.3% | Added |
| Adage Capital Partners GP, L.L.C. | 333,457 | $61.1M | 0.09% | +39,100+13.3% | Added |
| Victory Capital Management Inc | 320,785 | $58.8M | 0.04% | +74,135+30.1% | Added |
| Man Group plc | 318,745 | $58.4M | 0.12% | −20,539−6.1% | Reduced |
| FIL Ltd | 318,056 | $58.3M | 0.05% | −1,488−0.5% | Reduced |
| Fisher Asset Management, LLC | 312,618 | $57.3M | 0.02% | +19,349+6.6% | Added |
| Gotham Asset Management, LLC | 298,437 | $54.7M | 0.17% | +21,628+7.8% | Added |
| Swedbank AB | 289,840 | $53.1M | 0.06% | +58,231+25.1% | Added |
| Causeway Capital Management LLC | 280,783 | $51.5M | 0.63% | −240,318−46.1% | Reduced |
| Rhumbline Advisers | 275,438 | $50.5M | 0.04% | +3,692+1.4% | Added |
| Kames Capital plc | 258,735 | $47.4M | 0.63% | −1,427−0.5% | Reduced |
| Vanguard Asset Management, Ltd | 249,778 | $45.8M | 0.04% | +249,778 | New |
| Acadian Asset Management LLC | 248,489 | $45.5M | 0.06% | +61,032+32.6% | Added |
| Thompson Siegel & Walmsley LLC | 248,343 | $45.5M | 0.80% | +19,536+8.5% | Added |
| KBC Group NV | 234,692 | $43.0M | 0.11% | +181,294+339.5% | Added |
| Marshall Wace, LLP | 229,879 | $42.1M | 0.05% | −156,049−40.4% | Reduced |
| Sofinnova Investments, Inc. | 229,521 | $42.1M | 2.11% | +229,521 | New |
| California State Teachers Retirement System | 220,687 | $40.5M | 0.04% | −5,693−2.5% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 215,436 | $39.5M | 0.05% | −30,244−12.3% | Reduced |
| Qube Research & Technologies Ltd | 212,921 | $39.0M | 0.06% | +212,921 | New |
| Alliancebernstein L.P. | 212,897 | $37.5M | 0.01% | +29,153+15.9% | Added |
| Renaissance Technologies LLC | 203,396 | $37.3M | 0.06% | −195,800−49.0% | Reduced |
| Hudson Bay Capital Management LP | 201,367 | $36.9M | 0.22% | −20,493−9.2% | Reduced |
| Logos Global Management LP | 200,000 | $36.7M | 1.89% | 00.0% | Unchanged |
| KLP Kapitalforvaltning AS | 199,177 | $36.5M | 0.14% | +7,500+3.9% | Added |
| SG Americas Securities, LLC | 195,668 | $35.9M | 0.04% | +11,839+6.4% | Added |
| Principal Financial Group Inc | 187,059 | $34.3M | 0.02% | +2,870+1.6% | Added |
| Allianz Asset Management GmbH | 178,049 | $32.6M | 0.04% | −69,673−28.1% | Reduced |
| Prudential Financial Inc | 163,887 | $30.0M | 0.04% | −189,606−53.6% | Reduced |
| Ieq Capital, LLC | 152,076 | $27.9M | 0.13% | +12,437+8.9% | Added |
| ExodusPoint Capital Management, LP | 151,993 | $27.9M | 0.28% | +151,993 | New |
| Standard Life Aberdeen plc | 151,144 | $27.7M | 0.04% | +11,266+8.1% | Added |
| Letko, Brosseau & Associates Inc | 150,865 | $27.7M | 0.45% | +21,085+16.2% | Added |
| Franklin Resources Inc | 144,448 | $26.5M | 0.01% | +3,074+2.2% | Added |
| Panagora Asset Management Inc | 142,065 | $26.0M | 0.10% | +138,862+4,335.4% | Added |
| O'Shaughnessy Asset Management, LLC | 141,324 | $25.9M | 0.13% | +31,056+28.2% | Added |
| Palo Alto Investors LP | 140,719 | $25.8M | 3.95% | −42,852−23.3% | Reduced |
| Susquehanna International Group, LLP | 140,299 | $25.7M | 0.03% | −521,385−78.8% | Reduced |
| Citadel Advisors LLC | 138,093 | $25.3M | 0.02% | +97,669+241.6% | Added |
| Russell Investments Group, Ltd. | 135,841 | $25.1M | 0.03% | +16,754+14.1% | Added |
| Ameriprise Financial Inc | 132,603 | $24.3M | 0.01% | +842+0.6% | Added |
| Eurizon Capital SGR S.p.A. | 129,204 | $23.7M | 0.07% | −1,609−1.2% | Reduced |
| TD Asset Management Inc | 127,268 | $23.3M | 0.02% | −8,084−6.0% | Reduced |
| Wells Fargo & Company | 127,134 | $23.3M | 0.00% | +7,796+6.5% | Added |