Security record
CSTL
Castle Biosciences, Inc. · Healthcare · Medical - Diagnostics & Research
76Tracked holders
-1Δ holders
16.76MShares held
$400.39MReported value
+6New positions
−6Exits
Momentum inputs (comparable managers):
holder breadth -1.3% ·
share flow +3.8% ·
net new positions 0.0%
— formula
Concentrated accumulation — rising shares among fewer holders
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 | 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 · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 3.29M | +10.4% | $78.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 16 | Principal Financial Group Inc | 1.73M | -2.4% | $41.18M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | Principal Financial Group Inc | 1.73M | -2.4% | $41.18M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 18 | Vanguard Capital Management Llc | 1.23M | +4.2% | $29.25M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 19 | Allianz Asset Management GmbH | 811.32K | 0.0% | $19.92M | 0.0% | Held | 3 | SEC ↗ |
| 20 | Allianz Asset Management GmbH | 811.32K | 0.0% | $19.92M | 0.0% | Held | 3 | SEC ↗ |
| 21 | Allianz Asset Management GmbH | 811.32K | 0.0% | $19.92M | 0.0% | Held | 3 | SEC ↗ |
| 22 | Allianz Asset Management GmbH | 811.32K | 0.0% | $19.92M | 0.0% | Held | 3 | SEC ↗ |
| 23 | State Street Global Advisors ✦ (passive) | 822.08K | +6.9% | $19.63M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 24 | Geode Capital Management ✦ (passive) | 795.91K | +9.3% | $18.99M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 25 | Geode Capital Management ✦ (passive) | 795.91K | +9.3% | $18.99M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 26 | Mackenzie Financial Corp | 793.51K | +970.7% | $18.93M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 27 | Dimensional Fund Advisors Lp | 791.09K | -23.9% | $18.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 28 | Dimensional Fund Advisors Lp | 791.09K | -23.9% | $18.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 29 | Dimensional Fund Advisors Lp | 791.09K | -23.9% | $18.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 30 | Dimensional Fund Advisors Lp | 791.09K | -23.9% | $18.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 31 | Dimensional Fund Advisors Lp | 791.09K | -23.9% | $18.87M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 32 | Qube Research & Technologies Ltd | 589.30K | +5.3% | $14.05M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 33 | Renaissance Technologies ✦ | 371.20K | -30.3% | $8.85M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 34 | Goldman Sachs Group ✦ | 358.40K | +5.0% | $8.55M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 35 | Goldman Sachs Group ✦ | 358.40K | +5.0% | $8.55M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 36 | Point72 Asset Management ✦ | 357.32K | New | $8.52M | 0.0% | New | 1 | SEC ↗ |
| 37 | Connor, Clark & Lunn Investment… | 331.73K | -12.0% | $7.91M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 38 | Connor, Clark & Lunn Investment… | 331.73K | -12.0% | $7.91M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 39 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 40 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 329.68K | -23.1% | $7.86M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 46 | Allspring Global Investments… | 292.47K | +82.0% | $6.98M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 47 | Northern Trust Corp | 285.16K | +4.4% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 48 | Northern Trust Corp | 285.16K | +4.4% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 49 | Northern Trust Corp | 285.16K | +4.4% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 50 | Northern Trust Corp | 285.16K | +4.4% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 51 | Northern Trust Corp | 285.16K | +4.4% | $6.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 52 | Citadel Advisors ✦ | 265.35K | +119.3% | $6.33M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 53 | Citadel Advisors ✦ | 265.35K | +119.3% | $6.33M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 54 | Charles Schwab Investment… | 254.53K | +5.2% | $6.07M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 55 | New York State Common Retirement… | 234.75K | +0.7% | $5.60M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 56 | Nuveen, LLC | 231.73K | -55.6% | $5.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 57 | Nuveen, LLC | 231.73K | -55.6% | $5.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 58 | Nuveen, LLC | 231.73K | -55.6% | $5.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 59 | Millennium Management ✦ | 205.37K | -41.9% | $4.90M | 0.0% | ▼ Trim | 9 | SEC ↗ |
| 60 | AQR Capital Management ✦ | 166.57K | +156.7% | $3.97M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 61 | AQR Capital Management ✦ | 166.57K | +156.7% | $3.97M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 62 | AQR Capital Management ✦ | 166.57K | +156.7% | $3.97M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 63 | AQR Capital Management ✦ | 166.57K | +156.7% | $3.97M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 64 | AQR Capital Management ✦ | 166.57K | +156.7% | $3.97M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 65 | First Trust Advisors Lp | 145.06K | New | $3.46M | 0.0% | New | 1 | SEC ↗ |
| 66 | Hrt Financial Lp | 115.85K | +630.6% | $2.76M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | D. E. Shaw & Co. ✦ | 112.79K | -46.8% | $2.69M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 68 | Man Group plc | 108.76K | +130.7% | $2.59M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 69 | Two Sigma Investments ✦ | 100.37K | -59.7% | $2.39M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 70 | Bank Of America Corp /De/ | 98.75K | +45.6% | $2.36M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 71 | Bank Of America Corp /De/ | 98.75K | +45.6% | $2.36M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 72 | Bank of New York Mellon Corp | 98.02K | +10.6% | $2.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 73 | Bank of New York Mellon Corp | 98.02K | +10.6% | $2.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 74 | Bank of New York Mellon Corp | 98.02K | +10.6% | $2.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Bank of New York Mellon Corp | 98.02K | +10.6% | $2.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | Franklin Resources Inc | 97.73K | +7.5% | $2.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 77 | Franklin Resources Inc | 97.73K | +7.5% | $2.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 78 | Franklin Resources Inc | 97.73K | +7.5% | $2.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 79 | Arrowstreet Capital ✦ | 92.74K | +241.7% | $2.21M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 80 | UBS Group AG | 89.37K | +81.8% | $2.13M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 81 | UBS Group AG | 89.37K | +81.8% | $2.13M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 82 | UBS Group AG | 89.37K | +81.8% | $2.13M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 83 | JPMorgan Chase ✦ | 84.80K | -4.5% | $2.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 84 | JPMorgan Chase ✦ | 84.80K | -4.5% | $2.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 85 | JPMorgan Chase ✦ | 84.80K | -4.5% | $2.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 86 | JPMorgan Chase ✦ | 84.80K | -4.5% | $2.06M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 87 | Sei Investments Co | 74.43K | +112.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 88 | Sei Investments Co | 74.43K | +112.4% | $1.78M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 89 | Bnp Paribas Financial Markets | 69.57K | -43.0% | $1.66M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 90 | American Century Companies Inc | 65.41K | -17.3% | $1.56M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 91 | UBS AM, a distinct business unit of… | 64.35K | -0.9% | $1.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 92 | UBS AM, a distinct business unit of… | 64.35K | -0.9% | $1.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 93 | UBS AM, a distinct business unit of… | 64.35K | -0.9% | $1.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 94 | UBS AM, a distinct business unit of… | 64.35K | -0.9% | $1.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 95 | UBS AM, a distinct business unit of… | 64.35K | -0.9% | $1.53M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 96 | Norges Bank ✦ (passive) | 60.10K | New | $1.43M | 0.0% | New | 1 | SEC ↗ |
| 97 | Fidelity (FMR) ✦ | 55.87K | +10.8% | $1.33M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 98 | Fidelity (FMR) ✦ | 55.87K | +10.8% | $1.33M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 99 | Fidelity (FMR) ✦ | 55.87K | +10.8% | $1.33M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 100 | Envestnet Asset Management Inc | 55.16K | -10.8% | $1.32M | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Point72 Asset Management | $8.52M | 0.0% |
| First Trust Advisors Lp | $3.46M | 0.0% |
| Norges Bank | $1.43M | 0.0% |
Exited
| Schroder Investment… | $7.04M | was 0.0% |
| Nomura Holdings Inc | $877,613 | was 0.0% |
| Corient Private Wealth LP | $782,410 | was 0.0% |
| Canada Pension Plan… | $279,870 | was 0.0% |
| Susquehanna International… | $233,716 | was 0.0% |
| Group One Trading Llc | $7,169 | 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.
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: Q2 2026 ·
Methodology ·
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