CSTL
Castle Biosciences, Inc. · Healthcare · Medical - Diagnostics & Research
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -14.6% · net new positions 0.0% · formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 1 | +1 | 8.87K | $298,940 | +1 | n/a |
| Q2 2026 | 76 | -1 | 16.83M | $401.45M | +6 | −6 |
| Q1 2026 | 79 | -9 | 16.13M | $395.93M | +4 | −13 |
| Q4 2025 | 87 | +2 | 17.12M | $665.58M | +2 | n/a |
| Q3 2025 | 16 | 0 | 9.41M | $214.29M | +1 | −1 |
| Q2 2025 | 13 | -1 | 9.39M | $191.81M | n/a | −1 |
| Q1 2025 | 11 | 0 | 4.13M | $82.76M | +1 | −1 |
| Q4 2024 | 11 | +2 | 4.84M | $128.97M | +4 | −2 |
| Q3 2024 | 8 | 0 | 2.64M | $75.25M | n/a | n/a |
| Q2 2024 | 8 | n/a | 1.95M | $42.47M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 828.53K | +14.7% | $16.59M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 2 | State Street Global Advisors ✦ (passive) | 715.03K | +0.7% | $14.31M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | Renaissance Technologies ✦ | 701.20K | +2.4% | $14.04M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 649.85K | +3.5% | $13.01M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 5 | Citadel Advisors ✦ | 258.38K | -69.0% | $5.17M | 0.0% | ▼ Trim | 4 | SEC ↗ ×2 |
| 6 | Millennium Management ✦ | 254.75K | -53.6% | $5.10M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 7 | Point72 Asset Management ✦ | 236.22K | -56.8% | $4.73M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 8 | D. E. Shaw & Co. ✦ | 189.18K | +108.9% | $3.79M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 9 | Two Sigma Investments ✦ | 139.78K | New | $2.80M | 0.0% | New | 1 | SEC ↗ |
| 10 | AQR Capital Management ✦ | 137.02K | +548.9% | $2.74M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 11 | T. Rowe Price ✦ | 23.70K | +4.4% | $475,000 | 0.0% | ▲ Add | 4 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Two Sigma Investments | $2.80M | 0.0% |
Exited
| Arrowstreet Capital | $770,265 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 186 holders, 27.52M shares, $653.08M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
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)
Officer · 3.29K sh · $110,608
Officer, Director · 2.72K sh · $96,668
Officer, Director · 3.20K sh · $113,740
Officer, Director · 8.58K sh · $305,156
Officer · 2.81K sh · $100,350
Officer · 1.35K sh · $48,967
Officer · 1.03K sh · $35,363
Officer · 5.54K sh · $196,765
Officer, Director · 2.72K sh · $96,038
Officer, Director · 3.20K sh · $112,998
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology