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, Q4 2025
Institutional positions in Biogen Inc. as of Dec 31, 2025. 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
- 1,002
- +109 vs. Q3 2025
- Shares held
- 139.7M
- +8.71M (+6.6%) vs. Q3 2025
- Total value
- $24.6B
- +$6.26B (+34.1%) vs. Q3 2025
- New holders
- 191
- 323 more added
- Sold out
- 82
- 295 more reduced
16 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Biogen Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Group Inc | 17,447,092 | $3.07B | 0.04% | +157,857+0.9% | Added |
| BlackRock, Inc. | 14,811,370 | $2.61B | 0.04% | +47,418+0.3% | Added |
| Primecap Management Co | 14,757,997 | $2.60B | 1.97% | −196,700−1.3% | Reduced |
| FMR LLC | 9,425,863 | $1.66B | 0.08% | +8,138,103+632.0% | Added |
| State Street Corp | 7,159,020 | $1.26B | 0.04% | −160,729−2.2% | Reduced |
| Geode Capital Management, LLC | 4,199,399 | $736.4M | 0.05% | +130,618+3.2% | Added |
| Wellington Management Group LLP | 3,551,269 | $625.0M | 0.11% | −695,235−16.4% | Reduced |
| Point72 Asset Management, L.P. | 2,813,192 | $495.1M | 0.78% | −1,059,709−27.4% | Reduced |
| Norges Bank | 2,638,834 | $464.4M | 0.05% | +2,638,834 | New |
| Morgan Stanley | 2,325,013 | $409.2M | 0.02% | +73,478+3.3% | Added |
| JPMorgan Chase & Co | 1,857,262 | $326.9M | 0.02% | +588,912+46.4% | Added |
| Boston Partners | 1,720,595 | $302.8M | 0.31% | +1,720,595 | New |
| Invesco Ltd. | 1,655,441 | $291.3M | 0.03% | −762,686−31.5% | Reduced |
| AQR Capital Management LLC | 1,528,616 | $269.0M | 0.14% | −254,965−14.3% | Reduced |
| Legal & General Group Plc | 1,459,597 | $256.9M | 0.06% | −133,802−8.4% | Reduced |
| Northern Trust Corp | 1,446,126 | $254.5M | 0.03% | −53,206−3.5% | Reduced |
| UBS Asset Management Americas Inc | 1,391,370 | $244.9M | 0.05% | −47,838−3.3% | Reduced |
| Barclays PLC | 1,305,007 | $229.7M | 0.09% | −54,417−4.0% | Reduced |
| T. Rowe Price Investment Management, Inc. | 1,170,907 | $206.1M | 0.13% | +103,425+9.7% | Added |
| Pacer Advisors, Inc. | 1,145,890 | $201.7M | 0.52% | −305,359−21.0% | Reduced |
| Charles Schwab Investment Management Inc | 1,143,902 | $201.3M | 0.03% | +20,553+1.8% | Added |
| Bank of America Corp | 1,128,845 | $198.7M | 0.01% | −91,173−7.5% | Reduced |
| Millennium Management LLC | 1,125,586 | $198.1M | 0.14% | +14,396+1.3% | Added |
| Goldman Sachs Group Inc | 1,099,366 | $193.5M | 0.03% | +35,780+3.4% | Added |
| Van Eck Associates Corp | 1,065,616 | $187.5M | 0.15% | −1,315−0.1% | Reduced |
| Alyeska Investment Group, L.P. | 1,024,268 | $180.3M | 0.51% | +178,991+21.2% | Added |
| Dimensional Fund Advisors LP | 960,645 | $169.1M | 0.04% | +87,551+10.0% | Added |
| Deutsche Bank AG | 953,728 | $167.8M | 0.05% | −277,574−22.5% | Reduced |
| Pictet Asset Management Holding SA | 947,494 | $166.9M | 0.16% | +176,639+22.9% | Added |
| Bank of New York Mellon Corp | 811,106 | $142.7M | 0.03% | −73,595−8.3% | Reduced |
| Fred Alger Management, LLC | 798,774 | $140.6M | 0.55% | +796,735+39,074.8% | Added |
| Price T Rowe Associates Inc | 792,071 | $139.4M | 0.02% | −173,386−18.0% | Reduced |
| Massachusetts Financial Services Co | 712,559 | $125.4M | 0.04% | −16,757−2.3% | Reduced |
| Employees Provident Fund Board | 704,196 | $123.9M | 0.91% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 661,684 | $116.4M | 0.16% | +220,602+50.0% | Added |
| UBS Group AG | 641,788 | $112.9M | 0.02% | +2,823+0.4% | Added |
| Robeco Institutional Asset Management B.V. | 610,908 | $107.5M | 0.15% | −60,146−9.0% | Reduced |
| Balyasny Asset Management LLC | 607,953 | $107.0M | 0.20% | −626,196−50.7% | Reduced |
| Caisse de Depot Et Placement du Quebec | 588,545 | $103.6M | 0.18% | +19,292+3.4% | Added |
| Patient Capital Management, LLC | 576,352 | $101.4M | 3.92% | +179,703+45.3% | Added |
| Citigroup Inc | 573,844 | $101.0M | 0.07% | +371,545+183.7% | Added |
| Amundi | 572,429 | $100.7M | 0.03% | −45,880−7.4% | Reduced |
| First Trust Advisors LP | 565,847 | $99.6M | 0.07% | −274,710−32.7% | Reduced |
| Royal Bank of Canada | 541,825 | $95.4M | 0.02% | +43,705+8.8% | Added |
| Causeway Capital Management LLC | 521,101 | $91.7M | 1.26% | −46,417−8.2% | Reduced |
| BNP Paribas Arbitrage, SA | 508,067 | $89.4M | 0.06% | +112,129+28.3% | Added |
| HSBC Holdings PLC | 503,832 | $88.8M | 0.05% | +56,314+12.6% | Added |
| AustralianSuper Pty Ltd | 476,812 | $83.9M | 0.39% | −274,574−36.5% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 452,442 | $79.6M | 0.17% | +104,038+29.9% | Added |
| Swiss National Bank | 401,800 | $70.7M | 0.04% | −20,600−4.9% | Reduced |
| Renaissance Technologies LLC | 399,196 | $70.3M | 0.11% | −565,210−58.6% | Reduced |
| Marshall Wace, LLP | 385,928 | $67.9M | 0.07% | −501,733−56.5% | Reduced |
| HRT Financial LP | 384,265 | $67.6M | 0.21% | +379,819+8,542.9% | Added |
| Nuveen, LLC | 375,557 | $66.1M | 0.02% | +43,100+13.0% | Added |
| Sumitomo Mitsui Trust Holdings, Inc. | 370,627 | $65.2M | 0.04% | −44,982−10.8% | Reduced |
| Prudential Financial Inc | 353,493 | $62.2M | 0.08% | −85,616−19.5% | Reduced |
| Jain Global LLC | 353,173 | $62.2M | 0.61% | +353,173 | New |
| Man Group plc | 339,284 | $59.7M | 0.11% | −578,741−63.0% | Reduced |
| California Public Employees Retirement System | 330,806 | $58.2M | 0.03% | −12,980−3.8% | Reduced |
| Candriam Luxembourg S.C.A. | 330,472 | $58.2M | 0.29% | +171,651+108.1% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 319,909 | $56.9M | 0.04% | +12,530+4.1% | Added |
| FIL Ltd | 319,544 | $56.2M | 0.04% | +11,547+3.7% | Added |
| LSV Asset Management | 316,815 | $55.8M | 0.12% | +9,976+3.3% | Added |
| Adage Capital Partners GP, L.L.C. | 294,357 | $51.8M | 0.08% | −37,775−11.4% | Reduced |
| Fisher Asset Management, LLC | 293,269 | $51.6M | 0.02% | +15,984+5.8% | Added |
| Glenview Capital Management, LLC | 290,605 | $51.1M | 1.09% | +290,605 | New |
| National Pension Service | 287,238 | $50.6M | 0.04% | +2,036+0.7% | Added |
| Gotham Asset Management, LLC | 276,809 | $48.7M | 0.18% | +6,311+2.3% | Added |
| Rhumbline Advisers | 271,746 | $47.8M | 0.04% | −17,460−6.0% | Reduced |
| Kames Capital plc | 260,162 | $45.8M | 0.54% | +64,527+33.0% | Added |
| Two Sigma Investments, LP | 251,763 | $44.3M | 0.07% | +46,530+22.7% | Added |
| Allianz Asset Management GmbH | 247,722 | $43.6M | 0.05% | −149,081−37.6% | Reduced |
| Victory Capital Management Inc | 246,650 | $43.4M | 0.02% | +33,688+15.8% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 245,680 | $43.2M | 0.05% | +48,777+24.8% | Added |
| Swedbank AB | 231,609 | $40.8M | 0.04% | −830−0.4% | Reduced |
| Thompson Siegel & Walmsley LLC | 228,807 | $40.3M | 0.68% | −77,635−25.3% | Reduced |
| Artemis Investment Management LLP | 226,845 | $39.9M | 0.48% | +226,845 | New |
| California State Teachers Retirement System | 226,380 | $39.8M | 0.04% | −8,438−3.6% | Reduced |
| Hudson Bay Capital Management LP | 221,860 | $39.0M | 0.22% | −31,291−12.4% | Reduced |
| Logos Global Management LP | 200,000 | $35.2M | 2.35% | +100,000+100.0% | Added |
| KLP Kapitalforvaltning AS | 191,677 | $33.7M | 0.13% | +25,100+15.1% | Added |
| Freestone Grove Partners LP | 187,608 | $33.0M | 0.24% | −31,258−14.3% | Reduced |
| Acadian Asset Management LLC | 187,457 | $33.0M | 0.05% | −7,794−4.0% | Reduced |
| Principal Financial Group Inc | 184,189 | $32.4M | 0.02% | +26,347+16.7% | Added |
| SG Americas Securities, LLC | 183,829 | $32.4M | 0.04% | +174,122+1,793.8% | Added |
| Alliancebernstein L.P. | 183,744 | $32.3M | 0.01% | −53,531−22.6% | Reduced |
| Palo Alto Investors LP | 183,571 | $32.3M | 4.50% | −2,090−1.1% | Reduced |
| Los Angeles Capital Management LLC | 205,140 | $30.7M | 0.10% | +13,776+7.2% | Added |
| Defilade Capital Management, L.P. | 161,992 | $28.5M | 3.86% | +161,992 | New |
| Nomura Holdings Inc | 147,261 | $25.9M | 0.07% | +24,359+19.8% | Added |
| Banco Bilbao Vizcaya Argentaria, S.A. | 146,951 | $25.9M | 0.18% | +8,297+6.0% | Added |
| Squarepoint Ops LLC | 146,408 | $25.8M | 0.05% | +138,780+1,819.3% | Added |
| DekaBank Deutsche Girozentrale | 108,721 | $25.7M | 0.05% | 00.0% | Unchanged |
| Franklin Resources Inc | 141,374 | $24.9M | 0.01% | −87,782−38.3% | Reduced |
| Standard Life Aberdeen plc | 139,878 | $24.6M | 0.04% | +1,013+0.7% | Added |
| Ieq Capital, LLC | 139,639 | $24.6M | 0.07% | +1,358+1.0% | Added |
| Canada Pension Plan Investment Board | 138,078 | $24.3M | 0.02% | −101,302−42.3% | Reduced |
| TD Asset Management Inc | 135,352 | $23.8M | 0.02% | −25,843−16.0% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 134,566 | $23.7M | 0.53% | +134,566 | New |
| Suvretta Capital Management, LLC | 132,290 | $23.3M | 0.58% | −35,900−21.3% | Reduced |