Security record · archived quarter
BIIB
Biogen Inc. · Healthcare · Drug Manufacturers - General
163Tracked holders
0Δ holders
123.15MShares held
$21.67BReported value
+2New positions
−1Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +2.9% · net new positions +0.6% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
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 · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 17.45M | +0.9% | $3.07B | 0.0% | ▲ Add | 3 | SEC ↗ ×6 |
| 2 | BlackRock ✦ (passive) | 14.81M | +0.3% | $2.61B | 0.0% | ▲ Add | 3 | SEC ↗ ×20 |
| 3 | PRIMECAP Management ✦ | 14.76M | -1.3% | $2.60B | 2.0% | ▼ Trim | 7 | SEC ↗ |
| 4 | Fidelity (FMR) ✦ | 9.43M | +632.0% | $1.66B | 0.1% | ▲ Add | 3 | SEC ↗ ×7 |
| 5 | State Street Global Advisors ✦ (passive) | 7.16M | -2.2% | $1.26B | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 6 | Geode Capital Management ✦ (passive) | 4.20M | +3.2% | $736.43M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 7 | Wellington Management ✦ | 3.55M | -16.4% | $624.99M | 0.1% | ▼ Trim | 7 | SEC ↗ ×5 |
| 8 | Point72 Asset Management ✦ | 2.81M | -27.4% | $495.09M | 0.8% | ▼ Trim | 4 | SEC ↗ |
| 9 | Norges Bank ✦ (passive) | 2.64M | New | $464.41M | 0.1% | New | 1 | SEC ↗ |
| 10 | Morgan Stanley ✦ | 2.33M | +3.3% | $409.18M | 0.0% | ▲ Add | 2 | SEC ↗ ×16 |
| 11 | JPMorgan Chase ✦ | 1.86M | -26.8% | $326.86M | 0.0% | ▼ Trim | 2 | SEC ↗ ×14 |
| 12 | Boston Partners | 1.72M | — | $302.82M | 0.3% | n/c | 1 | SEC ↗ ×4 |
| 13 | Invesco Ltd. | 1.66M | — | $291.34M | 0.0% | n/c | 1 | SEC ↗ ×16 |
| 14 | AQR Capital Management ✦ | 1.53M | -14.3% | $269.02M | 0.1% | ▼ Trim | 7 | SEC ↗ ×6 |
| 15 | Legal & General Group Plc | 1.46M | — | $256.87M | 0.1% | n/c | 1 | SEC ↗ ×3 |
| 16 | Northern Trust Corp | 1.45M | — | $254.50M | 0.0% | n/c | 1 | SEC ↗ ×9 |
| 17 | UBS AM, a distinct business unit of… | 1.39M | — | $244.87M | 0.1% | n/c | 1 | SEC ↗ ×11 |
| 18 | Barclays Plc | 1.31M | — | $229.67M | 0.1% | n/c | 1 | SEC ↗ ×3 |
| 19 | Pacer Advisors, Inc. | 1.15M | — | $201.67M | 0.5% | n/c | 1 | SEC ↗ ×3 |
| 20 | Charles Schwab Investment… | 1.14M | — | $201.32M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Bank Of America Corp /De/ | 1.13M | — | $198.67M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 22 | Millennium Management ✦ | 1.13M | +1.3% | $198.09M | 0.1% | ▲ Add | 7 | SEC ↗ |
| 23 | Goldman Sachs Group ✦ | 1.10M | +3.4% | $193.48M | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 24 | Alyeska Investment Group, L.P. | 1.02M | — | $180.26M | 0.5% | n/c | 1 | SEC ↗ |
| 25 | Hsbc Holdings Plc | 1.01M | — | $177.68M | 0.1% | n/c | 1 | SEC ↗ ×20 |
| 26 | Dimensional Fund Advisors Lp | 960.64K | — | $169.07M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 27 | Deutsche Bank Ag\ | 953.73K | — | $167.85M | 0.1% | n/c | 1 | SEC ↗ ×12 |
| 28 | Pictet Asset Management Holding SA | 947.49K | — | $166.90M | 0.2% | n/c | 1 | SEC ↗ |
| 29 | Bank of New York Mellon Corp | 811.11K | — | $142.75M | 0.0% | n/c | 1 | SEC ↗ ×19 |
| 30 | T. Rowe Price ✦ | 792.07K | -18.0% | $139.40M | 0.0% | ▼ Trim | 7 | SEC ↗ ×2 |
| 31 | Massachusetts Financial Services Co… | 712.56K | — | $125.40M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 32 | Susquehanna International Group, Llp | 661.68K | — | $116.45M | 0.2% | n/c | 1 | SEC ↗ ×2 |
| 33 | UBS Group AG | 641.79K | — | $112.95M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 34 | Robeco Institutional Asset… | 610.91K | — | $107.51M | 0.2% | n/c | 1 | SEC ↗ |
| 35 | Balyasny Asset Management L.P. | 607.95K | — | $106.99M | 0.2% | n/c | 1 | SEC ↗ |
| 36 | Caisse De Depot Et Placement Du… | 588.54K | — | $103.58M | 0.2% | n/c | 1 | SEC ↗ |
| 37 | Citigroup Inc | 573.84K | — | $100.99M | 0.1% | n/c | 1 | SEC ↗ ×4 |
| 38 | Amundi | 572.43K | — | $100.74M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 39 | First Trust Advisors Lp | 565.85K | — | $99.58M | 0.1% | n/c | 1 | SEC ↗ |
| 40 | Royal Bank Of Canada | 541.83K | — | $95.36M | 0.0% | n/c | 1 | SEC ↗ ×8 |
| 41 | Bnp Paribas Financial Markets | 508.07K | — | $89.41M | 0.1% | n/c | 1 | SEC ↗ |
| 42 | Zurcher Kantonalbank (Zurich… | 452.44K | — | $79.63M | 0.2% | n/c | 1 | SEC ↗ |
| 43 | Swiss National Bank | 401.80K | — | $70.71M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Renaissance Technologies ✦ | 399.20K | -58.6% | $70.25M | 0.1% | ▼ Trim | 7 | SEC ↗ |
| 45 | Marshall Wace ✦ | 385.93K | -56.5% | $67.92M | 0.1% | ▼ Trim | 6 | SEC ↗ ×2 |
| 46 | Hrt Financial Lp | 384.26K | — | $67.63M | 0.2% | n/c | 1 | SEC ↗ |
| 47 | Nuveen, LLC | 375.56K | — | $66.09M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 48 | Sumitomo Mitsui Trust Group, Inc. | 370.63K | — | $65.23M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Prudential Financial Inc | 353.49K | — | $62.21M | 0.1% | n/c | 1 | SEC ↗ ×2 |
| 50 | Man Group plc | 339.28K | — | $59.71M | 0.1% | n/c | 1 | SEC ↗ ×2 |
| 51 | California Public Employees… | 330.81K | — | $58.22M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Mitsubishi UFJ Asset Management… | 319.91K | — | $56.89M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | FIL Ltd | 319.54K | — | $56.24M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 54 | Adage Capital Partners ✦ | 294.36K | -11.4% | $51.80M | 0.1% | ▼ Trim | 4 | SEC ↗ |
| 55 | Fisher Asset Management ✦ | 293.27K | +5.8% | $51.61M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 56 | Glenview Capital ✦ | 290.61K | New | $51.14M | 1.1% | New | 1 | SEC ↗ |
| 57 | National Pension Service | 287.24K | — | $50.55M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | Gotham Asset Management ✦ | 276.81K | +2.3% | $48.72M | 0.2% | ▲ Add | 7 | SEC ↗ |
| 59 | Rhumbline Advisers | 271.75K | — | $47.82M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Two Sigma Investments ✦ | 251.76K | +22.7% | $44.31M | 0.1% | ▲ Add | 7 | SEC ↗ |
| 61 | Allianz Asset Management GmbH | 247.72K | — | $43.60M | 0.1% | n/c | 1 | SEC ↗ ×3 |
| 62 | Victory Capital Management Inc | 246.65K | — | $43.41M | 0.0% | n/c | 1 | SEC ↗ |
| 63 | BNP Paribas Asset Management… | 245.68K | — | $43.24M | 0.1% | n/c | 1 | SEC ↗ ×3 |
| 64 | Swedbank AB | 231.61K | — | $40.76M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 65 | California State Teachers… | 226.38K | — | $39.84M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Principal Financial Group Inc | 184.19K | — | $32.42M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 67 | Alliancebernstein L.P. | 183.74K | — | $32.34M | 0.0% | n/c | 1 | SEC ↗ |
| 68 | Nomura Holdings Inc | 147.26K | — | $25.92M | 0.1% | n/c | 1 | SEC ↗ |
| 69 | Squarepoint Ops LLC | 146.41K | — | $25.77M | 0.1% | n/c | 1 | SEC ↗ |
| 70 | Franklin Resources Inc | 141.37K | — | $24.88M | 0.0% | n/c | 1 | SEC ↗ ×9 |
| 71 | Aberdeen Group plc | 139.88K | — | $24.62M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 72 | Canada Pension Plan Investment Board | 138.08K | — | $24.30M | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Td Asset Management Inc | 135.35K | — | $23.82M | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Ameriprise Financial Inc | 131.76K | — | $23.19M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 75 | Federated Hermes, Inc. | 131.17K | — | $23.08M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 76 | State Board Of Administration Of… | 125.75K | — | $22.13M | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Aviva Plc | 124.90K | — | $21.98M | 0.0% | n/c | 1 | SEC ↗ |
| 78 | Universal- Beteiligungs- und… | 123.74K | — | $21.83M | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Wells Fargo & Company/Mn | 119.34K | — | $21.00M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 80 | Russell Investments Group, Ltd. | 119.09K | — | $20.97M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 81 | Bank Of Montreal /Can/ | 113.68K | — | $20.01M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 82 | Manufacturers Life Insurance… | 105.74K | — | $18.62M | 0.0% | n/c | 1 | SEC ↗ |
| 83 | New York State Common Retirement… | 99.25K | — | $17.47M | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Quantinno Capital Management LP | 98.33K | — | $17.31M | 0.0% | n/c | 1 | SEC ↗ |
| 85 | National Bank Of Canada /Fi/ | 96.54K | — | $16.99M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 86 | Walleye Trading LLC | 95.52K | — | $16.81M | 0.3% | n/c | 1 | SEC ↗ |
| 87 | Creative Planning | 90.00K | — | $15.84M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 88 | LPL Financial LLC | 89.54K | — | $15.76M | 0.0% | n/c | 1 | SEC ↗ |
| 89 | American Century Companies Inc | 85.82K | — | $15.10M | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Raymond James Financial Inc | 83.71K | — | $14.73M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 91 | Corient Private Wealth LP | 87.47K | — | $13.95M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 92 | Credit Agricole S A | 76.78K | — | $13.51M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 93 | State Of Wisconsin Investment Board | 75.94K | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Chevy Chase Trust Holdings, LLC | 74.72K | — | $13.15M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 95 | Mackenzie Financial Corp | 71.08K | — | $12.51M | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Cerity Partners LLC | 68.37K | — | $12.03M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 97 | Asset Management One Co., Ltd. | 67.45K | — | $11.93M | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Nomura Asset Management Co Ltd | 67.35K | — | $11.85M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 99 | Mitsubishi UFJ Trust & Banking Corp | 65.32K | — | $11.50M | 0.0% | n/c | 1 | SEC ↗ |
| 100 | Royal London Asset Management Ltd | 64.56K | — | $11.36M | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $464.41M | 0.1% |
| Glenview Capital | $51.14M | 1.1% |
Exited
| Bridgewater Associates | $5.60M | 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: Q4 2025 ·
Methodology ·
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