Security record
BIIB
Biogen Inc. · Healthcare · Drug Manufacturers - General
161Tracked holders
0Δ holders
119.37MShares held
$25.77BReported 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 | $25.77B | +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 ↗ |
| 2 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 3 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 4 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 5 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 6 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 7 | Fidelity (FMR) ✦ | 18.22M | +42.2% | $3.94B | 0.2% | ▲ Add | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 24 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 25 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 26 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 27 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 28 | BlackRock ✦ (passive) | 15.99M | +0.1% | $3.45B | 0.1% | ▲ Add | 5 | SEC ↗ |
| 29 | PRIMECAP Management ✦ | 15.15M | +2.7% | $3.27B | 1.9% | ▲ Add | 9 | SEC ↗ |
| 30 | Vanguard Capital Management Llc | 9.65M | +1.2% | $2.09B | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | State Street Global Advisors ✦ (passive) | 7.34M | +2.5% | $1.59B | 0.0% | ▲ Add | 7 | SEC ↗ |
| 32 | Geode Capital Management ✦ (passive) | 4.45M | +2.5% | $957.94M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 33 | Geode Capital Management ✦ (passive) | 4.45M | +2.5% | $957.94M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 34 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 35 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 36 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 37 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 38 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 39 | Wellington Management ✦ | 3.12M | +5.3% | $673.56M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 40 | Norges Bank ✦ (passive) | 2.58M | New | $557.44M | 0.1% | New | 1 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 46 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 47 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 48 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 53 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 54 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 55 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 56 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 57 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 58 | Morgan Stanley ✦ | 2.41M | +11.1% | $520.98M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 59 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 60 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 61 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 62 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 63 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 64 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 65 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 66 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 67 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 68 | AQR Capital Management ✦ | 1.94M | +0.7% | $416.93M | 0.1% | ▲ Add | 9 | SEC ↗ |
| 69 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 70 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 71 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 72 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 73 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 74 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 75 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 76 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 77 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 78 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 79 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 80 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 81 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 82 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 83 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 84 | JPMorgan Chase ✦ | 1.82M | -9.6% | $394.95M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 85 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 86 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 87 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 88 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 89 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 90 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 91 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 93 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 94 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 96 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 97 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 98 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 99 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 100 | Invesco Ltd. | 1.80M | +3.4% | $389.76M | 0.0% | ▲ Add | 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% |
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.
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 ·
Get this via the API