Security record · archived quarter
ARWR
Arrowhead Pharmaceuticals, Inc. · Healthcare · Biotechnology
16Tracked holders
+2Δ holders
54.75MShares held
$865.08MReported value
+2New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +14.3% ·
share flow -0.7% ·
net new positions +12.5%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 133 | +6 | 82.36M | $6.29B | +14 | −7 |
| Q1 2026 | 129 | +9 | 82.68M | $4.92B | +14 | −6 |
| Q4 2025 | 119 | +2 | 83.16M | $5.52B | +3 | — |
| Q3 2025 | 18 | 0 | 61.93M | $2.14B | +1 | −2 |
| Q2 2025 | 16 | +2 | 54.75M | $865.08M | +2 | — |
| Q1 2025 | 11 | +1 | 14.99M | $191.04M | +1 | — |
| Q4 2024 | 10 | -1 | 13.46M | $253.12M | +1 | −2 |
| Q3 2024 | 10 | +1 | 7.88M | $152.69M | +1 | — |
| Q2 2024 | 9 | — | 6.44M | $167.29M | — | — |
Who holds it · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 19.42M | — | $306.91M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 15.53M | — | $245.30M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 15.53M | — | $245.30M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | The Vanguard Group ✦ (passive) | 15.53M | — | $245.30M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | The Vanguard Group ✦ (passive) | 15.53M | — | $245.30M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | The Vanguard Group ✦ (passive) | 15.53M | — | $245.30M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | State Street Global Advisors ✦ (passive) | 6.37M | -9.0% | $100.66M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 24 | Fidelity (FMR) ✦ | 5.17M | — | $81.69M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | Fidelity (FMR) ✦ | 5.17M | — | $81.69M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | Fidelity (FMR) ✦ | 5.17M | — | $81.69M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | Geode Capital Management ✦ (passive) | 2.98M | +1.0% | $47.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 28 | Geode Capital Management ✦ (passive) | 2.98M | +1.0% | $47.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 29 | Marshall Wace ✦ | 2.16M | +3507.8% | $34.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 30 | Marshall Wace ✦ | 2.16M | +3507.8% | $34.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 31 | Marshall Wace ✦ | 2.16M | +3507.8% | $34.06M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 32 | Norges Bank ✦ (passive) | 1.92M | +6.8% | $30.41M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 33 | Fisher Asset Management ✦ | 451.65K | -6.5% | $7.14M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 34 | Millennium Management ✦ | 169.04K | -75.5% | $2.67M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 35 | AQR Capital Management ✦ | 152.35K | +276.1% | $2.41M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | AQR Capital Management ✦ | 152.35K | +276.1% | $2.41M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 37 | AQR Capital Management ✦ | 152.35K | +276.1% | $2.41M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 38 | AQR Capital Management ✦ | 152.35K | +276.1% | $2.41M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 39 | Two Sigma Investments ✦ | 133.40K | -84.0% | $2.11M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 40 | T. Rowe Price ✦ | 100.61K | +8.0% | $1.59M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 41 | Arrowstreet Capital ✦ | 64.20K | New | $1.01M | 0.0% | New | 1 | SEC ↗ |
| 42 | Citadel Advisors ✦ | 62.24K | -93.7% | $983,471 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 43 | Wellington Management ✦ | 48.28K | -8.2% | $762,902 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 44 | Wellington Management ✦ | 48.28K | -8.2% | $762,902 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 45 | Wellington Management ✦ | 48.28K | -8.2% | $762,902 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 46 | Wellington Management ✦ | 48.28K | -8.2% | $762,902 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 47 | Gotham Asset Management ✦ | 18.86K | New | $298,035 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $1.01M | 0.0% |
| Gotham Asset Management | $298,035 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 7 holders, 11.03M shares, $23.90M 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.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Aug 18
OLUKOTUN ADEOYE Y
Director · 2.00K sh · $173,920
Aug 18
PERRY MICHAEL S
Director · 11.60K sh · $1.01M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Aug 14
SC 13G/A — Avoro Capital Advisors LLC
Jul 31
SC 13G/A — VANGUARD PORTFOLIO MANAGEMENT LLC
Jul 27
SC 13G/A — BlackRock, Inc.
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 2025 ·
Methodology ·
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