Security record · archived quarter
CSTL
Castle Biosciences, Inc. · Healthcare · Medical - Diagnostics & Research
87Tracked holders
+2Δ holders
17.12MShares held
$665.58MReported value
+2New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +2.4% ·
share flow -1.0% ·
net new positions +2.3%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
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 | 76 | -1 | 16.76M | $400.39M | +6 | −6 |
| Q1 2026 | 79 | -9 | 16.13M | $395.93M | +4 | −13 |
| Q4 2025 | 87 | +2 | 17.12M | $665.58M | +2 | — |
| Q3 2025 | 16 | 0 | 9.41M | $214.29M | +1 | −1 |
| Q2 2025 | 13 | -1 | 9.39M | $191.81M | — | −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 | — | — |
| Q2 2024 | 8 | — | 1.95M | $42.47M | — | — |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 3.11M | -2.6% | $120.79M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 16 | The Vanguard Group ✦ (passive) | 2.20M | +1.3% | $85.57M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | The Vanguard Group ✦ (passive) | 2.20M | +1.3% | $85.57M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 2.20M | +1.3% | $85.57M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 2.20M | +1.3% | $85.57M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | The Vanguard Group ✦ (passive) | 2.20M | +1.3% | $85.57M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | Principal Financial Group Inc | 1.81M | — | $70.32M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | Principal Financial Group Inc | 1.81M | — | $70.32M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Dimensional Fund Advisors Lp | 1.14M | — | $44.49M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Dimensional Fund Advisors Lp | 1.14M | — | $44.49M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | Dimensional Fund Advisors Lp | 1.14M | — | $44.49M | 0.0% | n/c | 1 | SEC ↗ |
| 26 | Dimensional Fund Advisors Lp | 1.14M | — | $44.49M | 0.0% | n/c | 1 | SEC ↗ |
| 27 | Dimensional Fund Advisors Lp | 1.14M | — | $44.49M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | State Street Global Advisors ✦ (passive) | 736.45K | +1.7% | $28.65M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 29 | Geode Capital Management ✦ (passive) | 714.91K | +2.3% | $27.81M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 714.91K | +2.3% | $27.81M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 31 | Allianz Asset Management GmbH | 622.30K | — | $24.21M | 0.0% | n/c | 1 | SEC ↗ |
| 32 | Allianz Asset Management GmbH | 622.30K | — | $24.21M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Nuveen, LLC | 524.68K | — | $20.41M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Nuveen, LLC | 524.68K | — | $20.41M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Nuveen, LLC | 524.68K | — | $20.41M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Renaissance Technologies ✦ | 493.10K | -12.3% | $19.18M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 37 | Connor, Clark & Lunn Investment… | 388.49K | — | $15.11M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Citadel Advisors ✦ | 366.36K | +46.0% | $14.25M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 39 | Citadel Advisors ✦ | 366.36K | +46.0% | $14.25M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 40 | Millennium Management ✦ | 308.91K | -46.3% | $12.02M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 41 | Goldman Sachs Group ✦ | 287.24K | -16.8% | $11.17M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 42 | Goldman Sachs Group ✦ | 287.24K | -16.8% | $11.17M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 43 | Bank Of America Corp /De/ | 263.02K | — | $10.23M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Bank Of America Corp /De/ | 263.02K | — | $10.23M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Bank Of America Corp /De/ | 263.02K | — | $10.23M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Bank Of America Corp /De/ | 263.02K | — | $10.23M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Bank Of America Corp /De/ | 263.02K | — | $10.23M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Northern Trust Corp | 262.24K | — | $10.20M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Charles Schwab Investment… | 242.53K | — | $9.43M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Qube Research & Technologies Ltd | 235.52K | — | $9.16M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | New York State Common Retirement… | 233.05K | — | $9.07M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | Wellington Management ✦ | 218.56K | New | $8.50M | 0.0% | New | 1 | SEC ↗ |
| 58 | Wellington Management ✦ | 218.56K | New | $8.50M | 0.0% | New | 1 | SEC ↗ |
| 59 | Wellington Management ✦ | 218.56K | New | $8.50M | 0.0% | New | 1 | SEC ↗ |
| 60 | Wellington Management ✦ | 218.56K | New | $8.50M | 0.0% | New | 1 | SEC ↗ |
| 61 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 62 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 63 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 64 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 65 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 66 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 67 | Morgan Stanley ✦ | 203.58K | -24.5% | $7.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 68 | Jane Street Group, Llc | 168.65K | — | $6.56M | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Jane Street Group, Llc | 168.65K | — | $6.56M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Jane Street Group, Llc | 168.65K | — | $6.56M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Tudor Investment Corp Et Al | 167.18K | — | $6.50M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | D. E. Shaw & Co. ✦ | 159.71K | +72.5% | $6.21M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 73 | Allspring Global Investments… | 159.17K | — | $6.13M | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Allspring Global Investments… | 159.17K | — | $6.13M | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Bnp Paribas Financial Markets | 150.01K | — | $5.84M | 0.0% | n/c | 1 | SEC ↗ |
| 76 | UBS Group AG | 141.87K | — | $5.52M | 0.0% | n/c | 1 | SEC ↗ |
| 77 | UBS Group AG | 141.87K | — | $5.52M | 0.0% | n/c | 1 | SEC ↗ |
| 78 | UBS Group AG | 141.87K | — | $5.52M | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Invesco Ltd. | 135.46K | — | $5.27M | 0.0% | n/c | 1 | SEC ↗ |
| 80 | Invesco Ltd. | 135.46K | — | $5.27M | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Invesco Ltd. | 135.46K | — | $5.27M | 0.0% | n/c | 1 | SEC ↗ |
| 82 | Invesco Ltd. | 135.46K | — | $5.27M | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Point72 Asset Management ✦ | 119.46K | -64.5% | $4.65M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 84 | JPMorgan Chase ✦ | 90.03K | +62.1% | $3.50M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 85 | JPMorgan Chase ✦ | 90.03K | +62.1% | $3.50M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 86 | JPMorgan Chase ✦ | 90.03K | +62.1% | $3.50M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 87 | JPMorgan Chase ✦ | 90.03K | +62.1% | $3.50M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 88 | Bank of New York Mellon Corp | 86.98K | — | $3.38M | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Bank of New York Mellon Corp | 86.98K | — | $3.38M | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Bank of New York Mellon Corp | 86.98K | — | $3.38M | 0.0% | n/c | 1 | SEC ↗ |
| 91 | Bank of New York Mellon Corp | 86.98K | — | $3.38M | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Two Sigma Investments ✦ | 84.07K | +227.1% | $3.27M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 93 | Franklin Resources Inc | 80.60K | — | $3.14M | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Franklin Resources Inc | 80.60K | — | $3.14M | 0.0% | n/c | 1 | SEC ↗ |
| 95 | Franklin Resources Inc | 80.60K | — | $3.14M | 0.0% | n/c | 1 | SEC ↗ |
| 96 | American Century Companies Inc | 77.77K | — | $3.03M | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Barclays Plc | 72.15K | — | $2.81M | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Barclays Plc | 72.15K | — | $2.81M | 0.0% | n/c | 1 | SEC ↗ |
| 99 | UBS AM, a distinct business unit of… | 69.63K | — | $2.71M | 0.0% | n/c | 1 | SEC ↗ |
| 100 | UBS AM, a distinct business unit of… | 69.63K | — | $2.71M | 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
| Wellington Management | $8.50M | 0.0% |
| Wellington Management | $8.50M | 0.0% |
| Wellington Management | $8.50M | 0.0% |
| Wellington Management | $8.50M | 0.0% |
Exited
| No tracked exits this quarter. |
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.
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 17
Juvenal Tobin W
Officer · 1.73K sh · $51,191
Aug 14
MAETZOLD DEREK J
Officer, Director · 1.10K sh · $33,022
Aug 14
MAETZOLD DEREK J
Officer, Director · 2.71K sh · $81,474
Aug 14
MAETZOLD DEREK J
Officer, Director · 2.31K sh · $69,226
Aug 14
MAETZOLD DEREK J
Officer, Director · 278 sh · $8,346
Aug 14
Stokes Frank
Officer · 24.91K sh · $741,511
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
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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