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; 1,047 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
- 1,001
- +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
- 322 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 | 1,047 | $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 |
|---|---|---|---|---|---|
| Ameriprise Financial Inc | 131,761 | $23.2M | 0.01% | −13,648−9.4% | Reduced |
| Suvretta Capital Management, LLC | 132,290 | $23.3M | 0.58% | −35,900−21.3% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 134,566 | $23.7M | 0.53% | +134,566 | New |
| TD Asset Management Inc | 135,352 | $23.8M | 0.02% | −25,843−16.0% | Reduced |
| Canada Pension Plan Investment Board | 138,078 | $24.3M | 0.02% | −101,302−42.3% | Reduced |
| Ieq Capital, LLC | 139,639 | $24.6M | 0.07% | +1,358+1.0% | Added |
| Standard Life Aberdeen plc | 139,878 | $24.6M | 0.04% | +1,013+0.7% | Added |
| Franklin Resources Inc | 141,374 | $24.9M | 0.01% | −87,782−38.3% | Reduced |
| DekaBank Deutsche Girozentrale | 108,721 | $25.7M | 0.05% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 146,408 | $25.8M | 0.05% | +138,780+1,819.3% | Added |
| Banco Bilbao Vizcaya Argentaria, S.A. | 146,951 | $25.9M | 0.18% | +8,297+6.0% | Added |
| Nomura Holdings Inc | 147,261 | $25.9M | 0.07% | +24,359+19.8% | Added |
| Defilade Capital Management, L.P. | 161,992 | $28.5M | 3.86% | +161,992 | New |
| Los Angeles Capital Management LLC | 205,140 | $30.7M | 0.10% | +13,776+7.2% | Added |
| Palo Alto Investors LP | 183,571 | $32.3M | 4.50% | −2,090−1.1% | Reduced |
| Alliancebernstein L.P. | 183,744 | $32.3M | 0.01% | −53,531−22.6% | Reduced |
| SG Americas Securities, LLC | 183,829 | $32.4M | 0.04% | +174,122+1,793.8% | Added |
| Principal Financial Group Inc | 184,189 | $32.4M | 0.02% | +26,347+16.7% | Added |
| Acadian Asset Management LLC | 187,457 | $33.0M | 0.05% | −7,794−4.0% | Reduced |
| Freestone Grove Partners LP | 187,608 | $33.0M | 0.24% | −31,258−14.3% | Reduced |
| KLP Kapitalforvaltning AS | 191,677 | $33.7M | 0.13% | +25,100+15.1% | Added |
| Logos Global Management LP | 200,000 | $35.2M | 2.35% | +100,000+100.0% | Added |
| Hudson Bay Capital Management LP | 221,860 | $39.0M | 0.22% | −31,291−12.4% | Reduced |
| California State Teachers Retirement System | 226,380 | $39.8M | 0.04% | −8,438−3.6% | Reduced |
| Artemis Investment Management LLP | 226,845 | $39.9M | 0.48% | +226,845 | New |
| Thompson Siegel & Walmsley LLC | 228,807 | $40.3M | 0.68% | −77,635−25.3% | Reduced |
| Swedbank AB | 231,609 | $40.8M | 0.04% | −830−0.4% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 245,680 | $43.2M | 0.05% | +48,777+24.8% | Added |
| Victory Capital Management Inc | 246,650 | $43.4M | 0.02% | +33,688+15.8% | Added |
| Allianz Asset Management GmbH | 247,722 | $43.6M | 0.05% | −149,081−37.6% | Reduced |
| Two Sigma Investments, LP | 251,763 | $44.3M | 0.07% | +46,530+22.7% | Added |
| Kames Capital plc | 260,162 | $45.8M | 0.54% | +64,527+33.0% | Added |
| Rhumbline Advisers | 271,746 | $47.8M | 0.04% | −17,460−6.0% | Reduced |
| Gotham Asset Management, LLC | 276,809 | $48.7M | 0.18% | +6,311+2.3% | Added |
| National Pension Service | 287,238 | $50.6M | 0.04% | +2,036+0.7% | Added |
| Glenview Capital Management, LLC | 290,605 | $51.1M | 1.09% | +290,605 | New |
| Fisher Asset Management, LLC | 293,269 | $51.6M | 0.02% | +15,984+5.8% | Added |
| Adage Capital Partners GP, L.L.C. | 294,357 | $51.8M | 0.08% | −37,775−11.4% | Reduced |
| LSV Asset Management | 316,815 | $55.8M | 0.12% | +9,976+3.3% | Added |
| FIL Ltd | 319,544 | $56.2M | 0.04% | +11,547+3.7% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 319,909 | $56.9M | 0.04% | +12,530+4.1% | Added |
| Candriam Luxembourg S.C.A. | 330,472 | $58.2M | 0.29% | +171,651+108.1% | Added |
| California Public Employees Retirement System | 330,806 | $58.2M | 0.03% | −12,980−3.8% | Reduced |
| Man Group plc | 339,284 | $59.7M | 0.11% | −578,741−63.0% | Reduced |
| Jain Global LLC | 353,173 | $62.2M | 0.61% | +353,173 | New |
| Prudential Financial Inc | 353,493 | $62.2M | 0.08% | −85,616−19.5% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 370,627 | $65.2M | 0.04% | −44,982−10.8% | Reduced |
| Nuveen, LLC | 375,557 | $66.1M | 0.02% | +43,100+13.0% | Added |
| HRT Financial LP | 384,265 | $67.6M | 0.21% | +379,819+8,542.9% | Added |
| Marshall Wace, LLP | 385,928 | $67.9M | 0.07% | −501,733−56.5% | Reduced |
| Renaissance Technologies LLC | 399,196 | $70.3M | 0.11% | −565,210−58.6% | Reduced |
| Swiss National Bank | 401,800 | $70.7M | 0.04% | −20,600−4.9% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 452,442 | $79.6M | 0.17% | +104,038+29.9% | Added |
| AustralianSuper Pty Ltd | 476,812 | $83.9M | 0.39% | −274,574−36.5% | Reduced |
| HSBC Holdings PLC | 503,832 | $88.8M | 0.05% | +56,314+12.6% | Added |
| BNP Paribas Arbitrage, SA | 508,067 | $89.4M | 0.06% | +112,129+28.3% | Added |
| Causeway Capital Management LLC | 521,101 | $91.7M | 1.26% | −46,417−8.2% | Reduced |
| Royal Bank of Canada | 541,825 | $95.4M | 0.02% | +43,705+8.8% | Added |
| First Trust Advisors LP | 565,847 | $99.6M | 0.07% | −274,710−32.7% | Reduced |
| Amundi | 572,429 | $100.7M | 0.03% | −45,880−7.4% | Reduced |
| Citigroup Inc | 573,844 | $101.0M | 0.07% | +371,545+183.7% | Added |
| Patient Capital Management, LLC | 576,352 | $101.4M | 3.92% | +179,703+45.3% | Added |
| Caisse de Depot Et Placement du Quebec | 588,545 | $103.6M | 0.18% | +19,292+3.4% | Added |
| Balyasny Asset Management LLC | 607,953 | $107.0M | 0.20% | −626,196−50.7% | Reduced |
| Robeco Institutional Asset Management B.V. | 610,908 | $107.5M | 0.15% | −60,146−9.0% | Reduced |
| UBS Group AG | 641,788 | $112.9M | 0.02% | +2,823+0.4% | Added |
| Susquehanna International Group, LLP | 661,684 | $116.4M | 0.16% | +220,602+50.0% | Added |
| Employees Provident Fund Board | 704,196 | $123.9M | 0.91% | 00.0% | Unchanged |
| Massachusetts Financial Services Co | 712,559 | $125.4M | 0.04% | −16,757−2.3% | Reduced |
| Price T Rowe Associates Inc | 792,071 | $139.4M | 0.02% | −173,386−18.0% | Reduced |
| Fred Alger Management, LLC | 798,774 | $140.6M | 0.55% | +796,735+39,074.8% | Added |
| Bank of New York Mellon Corp | 811,106 | $142.7M | 0.03% | −73,595−8.3% | Reduced |
| Pictet Asset Management Holding SA | 947,494 | $166.9M | 0.16% | +176,639+22.9% | Added |
| Deutsche Bank AG | 953,728 | $167.8M | 0.05% | −277,574−22.5% | Reduced |
| Dimensional Fund Advisors LP | 960,645 | $169.1M | 0.04% | +87,551+10.0% | Added |
| Alyeska Investment Group, L.P. | 1,024,268 | $180.3M | 0.51% | +178,991+21.2% | Added |
| Van Eck Associates Corp | 1,065,616 | $187.5M | 0.15% | −1,315−0.1% | Reduced |
| Goldman Sachs Group Inc | 1,099,366 | $193.5M | 0.03% | +35,780+3.4% | Added |
| Millennium Management LLC | 1,125,586 | $198.1M | 0.14% | +14,396+1.3% | Added |
| Bank of America Corp | 1,128,845 | $198.7M | 0.01% | −91,173−7.5% | Reduced |
| Charles Schwab Investment Management Inc | 1,143,902 | $201.3M | 0.03% | +20,553+1.8% | Added |
| Pacer Advisors, Inc. | 1,145,890 | $201.7M | 0.52% | −305,359−21.0% | Reduced |
| T. Rowe Price Investment Management, Inc. | 1,170,907 | $206.1M | 0.13% | +103,425+9.7% | Added |
| Barclays PLC | 1,305,007 | $229.7M | 0.09% | −54,417−4.0% | Reduced |
| UBS Asset Management Americas Inc | 1,391,370 | $244.9M | 0.05% | −47,838−3.3% | Reduced |
| Northern Trust Corp | 1,446,126 | $254.5M | 0.03% | −53,206−3.5% | Reduced |
| Legal & General Group Plc | 1,459,597 | $256.9M | 0.06% | −133,802−8.4% | Reduced |
| AQR Capital Management LLC | 1,528,616 | $269.0M | 0.14% | −254,965−14.3% | Reduced |
| Invesco Ltd. | 1,655,441 | $291.3M | 0.03% | −762,686−31.5% | Reduced |
| Boston Partners | 1,720,595 | $302.8M | 0.31% | +1,720,595 | New |
| JPMorgan Chase & Co | 1,857,262 | $326.9M | 0.02% | +588,912+46.4% | Added |
| Morgan Stanley | 2,325,013 | $409.2M | 0.02% | +73,478+3.3% | Added |
| Norges Bank | 2,638,834 | $464.4M | 0.05% | +2,638,834 | New |
| Point72 Asset Management, L.P. | 2,813,192 | $495.1M | 0.78% | −1,059,709−27.4% | Reduced |
| Wellington Management Group LLP | 3,551,269 | $625.0M | 0.11% | −695,235−16.4% | Reduced |
| Geode Capital Management, LLC | 4,199,399 | $736.4M | 0.05% | +130,618+3.2% | Added |
| State Street Corp | 7,159,020 | $1.26B | 0.04% | −160,729−2.2% | Reduced |
| FMR LLC | 9,425,863 | $1.66B | 0.08% | +8,138,103+632.0% | Added |
| Primecap Management Co | 14,757,997 | $2.60B | 1.97% | −196,700−1.3% | Reduced |
| BlackRock, Inc. | 14,811,370 | $2.61B | 0.04% | +47,418+0.3% | Added |