Security record · archived quarter
BIIB
Biogen Inc. · Healthcare · Drug Manufacturers - General
161Tracked holders
0Δ holders
119.37MShares held
$25.78BReported value
+6New positions
−5Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +5.6% · net new positions +0.6% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 161 | 0 | 119.37M | $25.78B | +6 | −5 |
| Q1 2026 | 163 | -1 | 110.78M | $20.30B | +4 | −6 |
| Q4 2025 | 163 | 0 | 123.15M | $21.67B | +2 | −1 |
| Q3 2025 | 24 | +1 | 81.72M | $11.44B | +1 | −1 |
| Q2 2025 | 21 | 0 | 78.50M | $9.86B | — | — |
| Q1 2025 | 18 | +2 | 41.87M | $5.73B | +3 | −1 |
| Q4 2024 | 16 | -1 | 41.64M | $6.37B | — | −1 |
| Q3 2024 | 16 | +2 | 32.39M | $6.28B | +2 | — |
| Q2 2024 | 14 | — | 30.72M | $7.12B | — | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ ×7 |
| 2 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ ×21 |
| 3 | PRIMECAP Management ✦ | 15.15M | +2.7% | $3.27B | 1.9% | ▲ Add | 9 | SEC ↗ |
| 4 | Vanguard Capital Management Llc | 9.65M | +1.2% | $2.09B | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | State Street Global Advisors ✦ (passive) | 7.34M | +2.5% | $1.59B | 0.0% | ▲ Add | 7 | SEC ↗ |
| 6 | Geode Capital Management ✦ (passive) | 4.45M | +2.5% | $957.94M | 0.1% | ▲ Add | 9 | SEC ↗ ×2 |
| 7 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ ×6 |
| 8 | Norges Bank ✦ (passive) | 2.58M | New | $557.44M | 0.1% | New | 1 | SEC ↗ |
| 9 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ ×18 |
| 10 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ ×10 |
| 11 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ ×16 |
| 12 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ ×21 |
| 13 | Amundi | 1.52M | +91.8% | $327.73M | 0.1% | ▲ Add | 3 | SEC ↗ ×4 |
| 14 | Legal & General Group Plc | 1.49M | +10.6% | $322.64M | 0.1% | ▲ Add | 3 | SEC ↗ ×3 |
| 15 | Northern Trust Corp | 1.43M | -1.2% | $308.86M | 0.0% | ▼ Trim | 3 | SEC ↗ ×10 |
| 16 | Boston Partners | 1.26M | -25.7% | $272.85M | 0.2% | ▼ Trim | 3 | SEC ↗ ×4 |
| 17 | UBS AM, a distinct business unit of… | 1.26M | -8.9% | $271.19M | 0.0% | ▼ Trim | 3 | SEC ↗ ×11 |
| 18 | Goldman Sachs Group ✦ | 1.23M | +17.1% | $265.84M | 0.0% | ▲ Add | 4 | SEC ↗ ×4 |
| 19 | Dimensional Fund Advisors Lp | 1.15M | +6.4% | $248.17M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 20 | Pacer Advisors, Inc. | 1.12M | +70.0% | $242.63M | 0.6% | ▲ Add | 3 | SEC ↗ |
| 21 | Charles Schwab Investment… | 1.12M | -2.8% | $241.48M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 22 | Bank Of America Corp /De/ | 1.12M | -3.5% | $241.17M | 0.0% | ▼ Trim | 3 | SEC ↗ ×8 |
| 23 | UBS Group AG | 1.03M | +96.8% | $222.57M | 0.0% | ▲ Add | 3 | SEC ↗ ×7 |
| 24 | Alyeska Investment Group, L.P. | 932.37K | +15.8% | $201.45M | 0.5% | ▲ Add | 3 | SEC ↗ |
| 25 | Deutsche Bank Ag\ | 894.03K | -16.0% | $193.17M | 0.1% | ▼ Trim | 3 | SEC ↗ ×12 |
| 26 | Pictet Asset Management Holding SA | 851.82K | -6.7% | $184.14M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 27 | Robeco Institutional Asset… | 791.09K | +3.7% | $170.92M | 0.2% | ▲ Add | 3 | SEC ↗ |
| 28 | T. Rowe Price ✦ | 774.28K | +15.2% | $167.29M | 0.0% | ▲ Add | 9 | SEC ↗ ×2 |
| 29 | Bank of New York Mellon Corp | 773.62K | -1.9% | $167.15M | 0.0% | ▼ Trim | 3 | SEC ↗ ×18 |
| 30 | Massachusetts Financial Services Co… | 744.89K | +3.4% | $163.13M | 0.1% | ▲ Add | 3 | SEC ↗ ×7 |
| 31 | Citigroup Inc | 734.52K | +46.8% | $158.70M | 0.1% | ▲ Add | 3 | SEC ↗ ×3 |
| 32 | Royal Bank Of Canada | 708.56K | +33.3% | $153.09M | 0.0% | ▲ Add | 3 | SEC ↗ ×9 |
| 33 | First Trust Advisors Lp | 682.02K | +1.2% | $147.36M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 34 | Zurcher Kantonalbank (Zurich… | 540.00K | +3.4% | $116.67M | 0.2% | ▲ Add | 3 | SEC ↗ |
| 35 | Hsbc Holdings Plc | 527.87K | +13.8% | $113.97M | 0.1% | ▲ Add | 3 | SEC ↗ ×8 |
| 36 | Caisse De Depot Et Placement Du… | 510.19K | -1.6% | $110.23M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 37 | Citadel Advisors ✦ | 418.36K | +202.9% | $90.39M | 0.1% | ▲ Add | 8 | SEC ↗ |
| 38 | Swiss National Bank | 413.90K | -3.9% | $89.43M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 39 | National Pension Service | 406.06K | +1.1% | $87.73M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 40 | Bnp Paribas Financial Markets | 387.54K | -17.7% | $83.73M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 41 | Mitsubishi UFJ Asset Management… | 358.82K | +7.3% | $77.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 42 | Sumitomo Mitsui Trust Group, Inc. | 346.62K | -2.7% | $74.89M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 43 | Victory Capital Management Inc | 343.42K | +7.1% | $74.20M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 44 | FIL Ltd | 342.62K | +7.7% | $74.03M | 0.1% | ▲ Add | 3 | SEC ↗ ×2 |
| 45 | Fisher Asset Management ✦ | 338.02K | +8.1% | $73.03M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 46 | California Public Employees… | 329.11K | -3.5% | $71.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 47 | Swedbank AB | 320.62K | +10.6% | $69.27M | 0.1% | ▲ Add | 3 | SEC ↗ ×2 |
| 48 | Nuveen, LLC | 317.20K | -11.6% | $68.53M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 49 | Gotham Asset Management ✦ | 279.90K | -6.2% | $60.48M | 0.1% | ▼ Trim | 9 | SEC ↗ |
| 50 | Balyasny Asset Management L.P. | 265.09K | -59.2% | $57.28M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 51 | Rhumbline Advisers | 262.98K | -4.5% | $56.82M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 52 | Barclays Plc | 247.16K | -55.2% | $53.40M | 0.0% | ▼ Trim | 3 | SEC ↗ ×3 |
| 53 | Voya Investment Management Llc | 246.78K | +352.3% | $53.32M | 0.1% | ▲ Add | 3 | SEC ↗ ×3 |
| 54 | BNP Paribas Asset Management… | 234.14K | +8.7% | $50.59M | 0.1% | ▲ Add | 3 | SEC ↗ ×3 |
| 55 | Man Group plc | 196.22K | -38.4% | $42.40M | 0.1% | ▼ Trim | 3 | SEC ↗ ×2 |
| 56 | Principal Financial Group Inc | 184.45K | -1.4% | $39.85M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 57 | Alliancebernstein L.P. | 214.97K | +1.0% | $39.41M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 58 | Allianz Asset Management GmbH | 180.08K | +1.1% | $38.91M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 59 | Quantinno Capital Management LP | 151.98K | +30.6% | $32.84M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 60 | Walleye Trading LLC | 139.25K | +39.9% | $30.09M | 0.4% | ▲ Add | 3 | SEC ↗ |
| 61 | Creative Planning | 138.61K | +18.2% | $29.95M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 62 | Franklin Resources Inc | 137.44K | -4.8% | $29.69M | 0.0% | ▼ Trim | 3 | SEC ↗ ×9 |
| 63 | Russell Investments Group, Ltd. | 133.89K | -1.4% | $28.96M | 0.0% | ▼ Trim | 3 | SEC ↗ ×10 |
| 64 | Adage Capital Partners ✦ | 129.60K | -61.1% | $28.00M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 65 | Wells Fargo & Company/Mn | 128.66K | +1.2% | $27.80M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 66 | Aberdeen Group plc | 128.23K | -15.2% | $27.70M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 67 | Bank Of Montreal /Can/ | 124.27K | +34.0% | $26.85M | 0.0% | ▲ Add | 3 | SEC ↗ ×6 |
| 68 | State Board Of Administration Of… | 121.31K | -2.3% | $26.21M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 69 | American Century Companies Inc | 114.15K | +8.9% | $24.66M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 70 | Raymond James Financial Inc | 108.17K | +11.9% | $23.37M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 71 | Aviva Plc | 108.05K | +11.6% | $23.35M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 72 | National Bank Of Canada /Fi/ | 107.42K | +36.2% | $23.21M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 73 | New York State Common Retirement… | 100.14K | +0.3% | $21.64M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 74 | Federated Hermes, Inc. | 98.31K | +1.1% | $21.24M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 75 | LPL Financial LLC | 95.47K | +16.8% | $20.63M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | Ameriprise Financial Inc | 91.36K | -31.1% | $19.74M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 77 | Manufacturers Life Insurance… | 90.78K | -4.5% | $19.61M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 78 | Point72 Asset Management ✦ | 88.15K | -89.1% | $19.05M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 79 | Mariner, LLC | 87.37K | +21.3% | $18.88M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 80 | Mackenzie Financial Corp | 86.39K | +20.9% | $18.67M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 81 | Mitsubishi UFJ Trust & Banking Corp | 84.35K | +29.6% | $18.22M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 82 | Sei Investments Co | 82.52K | +15.4% | $17.83M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 83 | State Of Wisconsin Investment Board | 78.23K | -0.4% | $16.90M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 84 | Cerity Partners LLC | 78.15K | +2.0% | $16.88M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 85 | Renaissance Technologies ✦ | 77.74K | -61.8% | $16.80M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 86 | D. E. Shaw & Co. ✦ | 74.44K | New | $16.08M | 0.0% | New | 1 | SEC ↗ |
| 87 | Prudential Financial Inc | 72.34K | -55.9% | $15.63M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 88 | Susquehanna International Group, Llp | 71.56K | -49.0% | $15.46M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 89 | Chevy Chase Trust Holdings, LLC | 71.46K | -1.6% | $15.44M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 90 | Universal- Beteiligungs- und… | 71.35K | +4.5% | $15.43M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 91 | Envestnet Asset Management Inc | 68.37K | +5.7% | $14.77M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | Danske Bank A/S | 66.36K | +40.0% | $14.34M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 93 | Royal London Asset Management Ltd | 64.75K | +0.8% | $13.99M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 94 | Asset Management One Co., Ltd. | 64.12K | 0.0% | $13.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | Tidal Investments LLC | 63.84K | +9.0% | $13.79M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 96 | Credit Agricole S A | 61.85K | +169.1% | $13.36M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 97 | Mirae Asset Global Investments Co.… | 58.75K | +46.0% | $12.69M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 98 | Td Asset Management Inc | 57.80K | -54.6% | $12.49M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 99 | Lazard Asset Management Llc | 57.07K | +237.0% | $12.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 100 | Nomura Asset Management Co Ltd | 54.96K | -12.7% | $11.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $557.44M | 0.1% |
| D. E. Shaw & Co. | $16.08M | 0.0% |
Exited
| Qube Research & Technologies… | $39.03M | was 0.1% |
| Millennium Management | $17.23M | was 0.0% |
| Glenview Capital | $10.45M | was 0.3% |
| Bank Julius Baer & Co. Ltd… | $7,349 | was 0.0% |
| Optiver Holding B.V. | $7,150 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 995 holders, 132.27M shares, $23.30B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Aug 06
SC 13G/A — FMR LLC
Jun 05
SC 13G/A — FMR LLC
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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