Security record · archived quarter
BIIB
Biogen Inc. · Healthcare · Drug Manufacturers - General
14Tracked holders
—Δ holders
30.72MShares held
$7.12BReported value
+0New positions
−0Exits
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2024
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 2024
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | PRIMECAP Management ✦ | 16.34M | — | $3.79B | 2.7% | n/c | 1 | SEC ↗ |
| 2 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 3 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 4 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 5 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 6 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 7 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 8 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 9 | Wellington Management ✦ | 5.17M | — | $1.20B | 0.2% | n/c | 1 | SEC ↗ |
| 10 | Geode Capital Management ✦ (passive) | 3.57M | — | $824.55M | 0.1% | n/c | 1 | SEC ↗ |
| 11 | Geode Capital Management ✦ (passive) | 3.57M | — | $824.55M | 0.1% | n/c | 1 | SEC ↗ |
| 12 | Norges Bank ✦ (passive) | 2.08M | — | $481.89M | 0.1% | n/c | 1 | SEC ↗ |
| 13 | T. Rowe Price ✦ | 2.01M | — | $466.29M | 0.1% | n/c | 1 | SEC ↗ |
| 14 | T. Rowe Price ✦ | 2.01M | — | $466.29M | 0.1% | n/c | 1 | SEC ↗ |
| 15 | Renaissance Technologies ✦ | 618.11K | — | $143.29M | 0.2% | n/c | 1 | SEC ↗ |
| 16 | Millennium Management ✦ | 239.85K | — | $55.60M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | D. E. Shaw & Co. ✦ | 214.69K | — | $49.77M | 0.1% | n/c | 1 | SEC ↗ |
| 18 | Two Sigma Investments ✦ | 212.90K | — | $49.35M | 0.1% | n/c | 1 | SEC ↗ |
| 19 | Adage Capital Partners ✦ | 137.70K | — | $31.92M | 0.1% | n/c | 1 | SEC ↗ |
| 20 | Fisher Asset Management ✦ | 68.49K | — | $15.88M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | AQR Capital Management ✦ | 23.56K | — | $5.46M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | AQR Capital Management ✦ | 23.56K | — | $5.46M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Gotham Asset Management ✦ | 23.56K | — | $5.46M | 0.1% | n/c | 1 | SEC ↗ |
| 24 | Bridgewater Associates ✦ | 16.42K | — | $3.81M | 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
| No new tracked buyers this quarter. |
Exited
| No tracked exits this quarter. |
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 2024 ·
Methodology ·
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