BIOGEN INC (BIIB)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
986
Reporting holders
$31.3B
Reported value
94.6%
Of shares outstanding
3.7%
Held as options
+40
Holder change
Institutions report 139,765,246 shares against 147,753,998 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. A figure this high can overstate: where an adviser and a sub-adviser both report the same shares, both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| FMR LLC | $3.9B | 18,217,239 | 0.17% | 31q | +42.2%+$1.2B |
| BlackRock, Inc. | $3.5B | 15,985,736 | 0.05% | 8q | HELD |
| PRIMECAP MANAGEMENT CO/CA/ | $3.3B | 15,154,606 | 1.94% | 31q | +2.7%+$85.8M |
| VANGUARD CAPITAL MANAGEMENT LLC | $2.1B | 9,651,117 | 0.04% | 2q | +1.2%+$24.6M |
| STATE STREET CORP | $1.6B | 7,344,327 | 0.05% | 31q | +2.5%+$38.1M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $1.4B | 6,604,936 | 0.06% | 2q | +1.1%+$15.8M |
| GEODE CAPITAL MANAGEMENT, LLC | $957.9M | 4,449,295 | 0.05% | 31q | +2.5%+$23.0M |
| WELLINGTON MANAGEMENT GROUP LLP | $673.6M | 3,117,469 | 0.12% | 31q | +5.3%+$33.7M |
| NORGES BANK | $557.4M | 2,580,033 | 0.06% | 32q | -2.2%-$12.7M |
| MORGAN STANLEY | $521.0M | 2,411,271 | 0.03% | 35q | +11.1%+$51.9M |
| AQR CAPITAL MANAGEMENT LLC | $416.9M | 1,936,859 | 0.15% | 31q | +0.7%+$2.9M |
| JPMORGAN CHASE & CO | $394.9M | 1,823,140 | 0.02% | 31q | -9.6%-$41.8M |
| Invesco Ltd. | $389.8M | 1,803,944 | 0.03% | 31q | +3.4%+$12.7M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $356.0M | 71,561 | 0.03% | 31q | -49.0%-$342.0M |
| UBS Group AG | $331.3M | 1,030,150 | 0.04% | 31q | +96.8%+$163.0M |
| Amundi | $327.7M | 1,516,831 | 0.08% | 21q | +91.8%+$156.9M |
| Legal & General Group Plc | $322.6M | 1,493,289 | 0.07% | 31q | +10.6%+$31.0M |
| NORTHERN TRUST CORP | $308.9M | 1,429,490 | 0.04% | 31q | -1.2%-$3.7M |
| GOLDMAN SACHS GROUP INC | $274.5M | 1,230,390 | 0.02% | 31q | +17.1%+$40.0M |
| Boston Partners | $272.8M | 1,263,429 | 0.24% | 3q | -25.7%-$94.3M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $271.2M | 1,255,168 | 0.05% | 31q | -8.9%-$26.4M |
| DIMENSIONAL FUND ADVISORS LP | $248.2M | 1,148,568 | 0.04% | 31q | +6.4%+$15.0M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $241.5M | 1,117,663 | 0.03% | 31q | -2.8%-$6.9M |
| Sixth Street Partners Management Company, L.P. | $241.5M | 1,117,663 | 0.03% | new | NEW |
| BANK OF AMERICA CORP /DE/ | $241.2M | 1,116,228 | 0.02% | 31q | -3.5%-$8.7M |
| Alyeska Investment Group, L.P. | $201.4M | 932,374 | 0.52% | 5q | +15.8%+$27.5M |
| DEUTSCHE BANK AG\ | $193.2M | 894,035 | 0.06% | 34q | -16.0%-$36.7M |
| CITADEL ADVISORS LLC | $187.4M | 418,356 | 0.02% | 31q | +203.0%+$125.6M |
| Pictet Asset Management Holding SA | $184.1M | 851,819 | 0.18% | 12q | -6.7%-$13.3M |
| VANGUARD FIDUCIARY TRUST CO | $179.2M | 829,318 | 0.04% | 2q | HELD |
| CITIGROUP INC | $175.2M | 734,517 | 0.06% | 31q | +46.8%+$55.8M |
| Robeco Institutional Asset Management B.V. | $170.9M | 791,092 | 0.21% | 38q | +3.7%+$6.0M |
| FRED ALGER MANAGEMENT, LLC | $170.3M | 788,307 | 0.57% | 4q | +7.5%+$11.9M |
| Bank of New York Mellon Corp | $167.1M | 773,619 | 0.03% | 31q | -1.9%-$3.2M |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $163.1M | 744,892 | 0.05% | 31q | +3.4%+$5.3M |
| ROYAL BANK OF CANADA | $153.1M | 708,562 | 0.02% | 31q | +33.3%+$38.3M |
| Employees Provident Fund Board | $152.1M | 704,196 | 0.87% | 27q | HELD |
| LMR Partners LLP | $147.4M | 4,866 | 0.55% | 3q | -95.8%-$3.4B |
| FIRST TRUST ADVISORS LP | $147.4M | 682,021 | 0.09% | 31q | +1.2%+$1.7M |
| AustralianSuper Pty Ltd | $145.3M | 672,723 | 0.63% | 6q | +9.2%+$12.2M |
| Artemis Investment Management LLP | $123.4M | 570,974 | 1.10% | 3q | HELD |
| Zurcher Kantonalbank (Zurich Cantonalbank) | $116.7M | 540,001 | 0.22% | 31q | +3.4%+$3.9M |
| HSBC HOLDINGS PLC | $115.7M | 527,866 | 0.05% | 31q | +13.8%+$14.1M |
| Caisse de depot et placement du Quebec | $110.2M | 510,194 | 0.16% | 6q | -1.6%-$1.8M |
| Patient Capital Management, LLC | $102.2M | 283,697 | 3.35% | 10q | -25.3%-$34.6M |
| BARCLAYS PLC | $92.3M | 247,157 | 0.02% | 31q | -55.2%-$113.6M |
| Palo Alto Investors LP | $90.9M | 420,837 | 4.19% | 23q | +199.1%+$60.5M |
| JANE STREET GROUP, LLC | $90.9M | 11,435 | 0.01% | 31q | +9.2%+$7.7M |
| Swiss National Bank | $89.4M | 413,900 | 0.05% | 31q | -3.9%-$3.6M |
| National Pension Service | $87.7M | 406,064 | 0.06% | 31q | +1.1%+$950.0K |
| BNP PARIBAS FINANCIAL MARKETS | $84.7M | 387,542 | 0.03% | 31q | -17.7%-$18.3M |
| Candriam S.C.A. | $83.0M | 384,326 | 0.37% | 31q | +0.7%+$552.1K |
| Balyasny Asset Management L.P. | $78.9M | 265,090 | 0.10% | 9q | -59.2%-$114.5M |
| Mitsubishi UFJ Asset Management Co., Ltd. | $77.5M | 358,823 | 0.04% | 31q | +7.3%+$5.3M |
| Sumitomo Mitsui Trust Group, Inc. | $74.9M | 346,617 | 0.04% | 31q | -2.7%-$2.1M |
| VICTORY CAPITAL MANAGEMENT INC | $74.2M | 343,419 | 0.04% | 31q | +7.1%+$4.9M |
| FIL Ltd | $74.0M | 342,623 | 0.05% | 16q | +7.7%+$5.3M |
| Fisher Asset Management, LLC | $73.0M | 338,018 | 0.02% | 31q | +8.1%+$5.5M |
| Vanguard Global Advisers, LLC | $72.6M | 335,936 | 0.03% | 2q | -2.3%-$1.7M |
| California Public Employees Retirement System | $71.1M | 329,106 | 0.04% | 31q | -3.5%-$2.5M |
| Swedbank AB | $69.3M | 320,622 | 0.06% | 21q | +10.6%+$6.7M |
| Nuveen, LLC | $68.5M | 317,204 | 0.02% | 6q | -11.6%-$9.0M |
| VANGUARD ASSET MANAGEMENT, Ltd | $61.4M | 284,376 | 0.04% | 2q | +13.9%+$7.5M |
| Gotham Asset Management, LLC | $60.5M | 279,900 | 0.14% | 9q | -6.2%-$4.0M |
| CAUSEWAY CAPITAL MANAGEMENT LLC | $60.1M | 278,283 | 0.65% | 7q | -0.9%-$540.1K |
| PERCEPTIVE ADVISORS LLC | $59.7M | 276,173 | 0.90% | new | NEW |
| IMC-Chicago, LLC | $57.9M | 20,649 | 0.01% | 19q | HELD |
| RHUMBLINE ADVISERS | $56.8M | 262,979 | 0.04% | 31q | -4.5%-$2.7M |
| VOYA INVESTMENT MANAGEMENT LLC | $53.3M | 246,782 | 0.05% | 31q | +352.3%+$41.5M |
| AEGON ASSET MANAGEMENT UK Plc | $52.1M | 241,101 | 0.56% | 4q | -6.8%-$3.8M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $50.6M | 234,138 | 0.05% | 31q | +8.7%+$4.0M |
| Walleye Trading LLC | $44.1M | 139,253 | 0.05% | 31q | +39.9%+$12.6M |
| KLP KAPITALFORVALTNING AS | $43.0M | 199,177 | 0.14% | 7q | HELD |
| SPHERA FUNDS MANAGEMENT LTD. | $42.5M | 96,626 | 5.54% | 16q | +4.4%+$1.8M |
| Man Group plc | $42.4M | 196,222 | 0.07% | 31q | -38.4%-$26.5M |
| PANAGORA ASSET MANAGEMENT INC | $40.4M | 186,929 | 0.12% | 31q | +31.6%+$9.7M |
| NISSAY ASSET MANAGEMENT CORP /JAPAN | $40.0M | 185,301 | 0.17% | 31q | +522.6%+$33.6M |
| PRINCIPAL FINANCIAL GROUP INC | $39.9M | 184,450 | 0.02% | 31q | -1.4%-$563.7K |
| ALLIANCEBERNSTEIN L.P. | $39.4M | 214,975 | 0.01% | 31q | +1.0%+$381.0K |
| JUPITER ASSET MANAGEMENT LTD | $34.6M | 160,057 | 0.17% | 2q | +2141.4%+$33.0M |
| Quantinno Capital Management LP | $32.8M | 151,977 | 0.04% | 15q | +30.6%+$7.7M |
| Allianz Asset Management GmbH | $32.7M | 178,012 | 0.03% | 40q | HELD |
| LETKO, BROSSEAU & ASSOCIATES INC | $31.7M | 146,562 | 0.47% | 31q | -2.9%-$929.7K |
| Portolan Capital Management, LLC | $30.9M | 142,856 | 1.16% | 3q | +20.6%+$5.3M |
| Creative Planning | $29.9M | 138,613 | 0.02% | 31q | +18.2%+$4.6M |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $29.9M | 138,260 | 0.14% | 28q | -2.2%-$662.0K |
| FRANKLIN RESOURCES INC | $29.7M | 137,436 | 0.01% | 31q | -4.9%-$1.5M |
| Nippon Life Global Investors Americas, Inc. | $29.6M | 137,220 | 1.18% | 3q | +308.8%+$22.4M |
| Russell Investments Group, Ltd. | $29.0M | 133,894 | 0.03% | 31q | -1.4%-$421.0K |
| IEQ CAPITAL, LLC | $28.6M | 132,142 | 0.13% | 22q | -13.1%-$4.3M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $28.0M | 129,599 | 0.04% | 6q | -61.1%-$44.0M |
| WELLS FARGO & COMPANY/MN | $27.8M | 128,664 | 0.00% | 31q | -49.4%-$27.1M |
| Aberdeen Group plc | $27.7M | 128,227 | 0.04% | 31q | -15.2%-$5.0M |
| BANK OF MONTREAL /CAN/ | $26.8M | 124,267 | 0.01% | 31q | +34.0%+$6.8M |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $26.2M | 121,311 | 0.04% | 31q | -2.3%-$626.8K |
| PEAK6 LLC | $25.3M | 14,752 | 0.05% | 7q | -47.6%-$23.0M |
| AMERICAN CENTURY COMPANIES INC | $24.7M | 114,152 | 0.01% | 31q | +8.9%+$2.0M |
| Woodline Partners LP | $24.3M | 112,463 | 0.08% | 11q | +3.1%+$741.3K |
| RAYMOND JAMES FINANCIAL INC | $23.4M | 108,174 | 0.01% | 7q | +11.9%+$2.5M |
| AVIVA PLC | $23.3M | 108,052 | 0.03% | 31q | +11.6%+$2.4M |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 12.4% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 986 | $31.3B | 139,765,246 | 112 | 384 | 255 | 3.7% |
| Q1 2026 | 946 | $24.4B | 129,587,370 | 107 | 346 | 265 | 2.8% |
| Q4 2025 | 935 | $24.9B | 134,729,066 | 134 | 292 | 258 | 4.8% |
| Q3 2025 | 839 | $18.8B | 127,364,938 | 116 | 281 | 228 | 4.9% |
| Q2 2025 | 792 | $16.4B | 125,034,504 | 80 | 298 | 237 | 4.4% |
| Q1 2025 | 800 | $17.7B | 122,376,845 | 96 | 290 | 234 | 5.3% |
| Q4 2024 | 805 | $19.4B | 122,854,290 | 66 | 263 | 285 | 3.3% |
| Q3 2024 | 840 | $24.6B | 124,407,660 | 82 | 239 | 318 | 1.9% |
| Q2 2024 | 866 | $28.8B | 121,373,722 | 80 | 275 | 295 | 2.2% |
| Q1 2024 | 862 | $27.3B | 124,128,107 | 81 | 253 | 304 | 2.1% |
| Q4 2023 | 897 | $32.9B | 122,803,760 | 70 | 240 | 297 | 3.4% |
| Q3 2023 | 853 | $29.8B | 112,075,330 | 74 | 280 | 271 | 3.5% |
| Q2 2023 | 871 | $33.8B | 114,867,525 | 68 | 250 | 298 | 3.3% |
| Q1 2023 | 864 | $33.9B | 119,815,209 | 67 | 269 | 293 | 3.9% |
| Q4 2022 | 815 | $31.8B | 106,092,248 | 92 | 239 | 275 | 7.9% |
| Q3 2022 | 995 | $37.1B | 124,005,441 | 144 | 260 | 358 | 10.7% |
| Q2 2022 | 930 | $27.0B | 122,731,164 | 75 | 280 | 335 | 7.4% |
| Q1 2022 | 951 | $27.6B | 123,444,068 | 72 | 305 | 373 | 5.8% |
| Q4 2021 | 1,012 | $33.3B | 125,142,013 | 81 | 290 | 382 | 9.9% |
| Q3 2021 | 1,042 | $38.0B | 123,752,771 | 63 | 326 | 374 | 7.9% |
| Q2 2021 | 1,111 | $47.4B | 126,025,295 | 133 | 315 | 448 | 8.0% |
| Q1 2021 | 1,099 | $38.5B | 127,706,070 | 120 | 341 | 391 | 7.3% |
| Q4 2020 | 1,072 | $36.4B | 130,364,900 | 105 | 270 | 428 | 12.1% |
| Q3 2020 | 1,056 | $40.3B | 131,784,632 | 88 | 293 | 414 | 7.3% |
| Q2 2020 | 1,067 | $38.8B | 136,452,248 | 92 | 323 | 426 | 6.0% |
| Q1 2020 | 1,113 | $48.9B | 146,086,541 | 104 | 311 | 463 | 5.6% |
| Q4 2019 | 1,112 | $49.6B | 156,817,270 | 141 | 262 | 453 | 6.2% |
| Q3 2019 | 996 | $40.0B | 161,238,925 | 75 | 301 | 400 | 6.1% |
| Q2 2019 | 1,017 | $41.4B | 163,357,525 | 78 | 307 | 429 | 7.6% |
| Q1 2019 | 1,102 | $43.2B | 172,423,847 | 112 | 367 | 421 | 5.6% |
| Q4 2018 | 1,148 | $56.4B | 180,086,899 | 11 | 18 | 19 | 4.1% |