Institutional Ownership
Castle Biosciences Inc
CUSIP 14843C105COMCSTLQ1 2026
13D / 13G Filings
36
Schedule 13D/13G on record
Beneficial Filers
17
Distinct reporting persons
Largest Stake
12.3%
Max % of class reported
Institutional Holders
178
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
36 filings · latest Feb 17, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 17, 2026 | Rtw Investments, LP | 13G | 7.2% | 2.12M | SEC |
| 2 | Jan 21, 2026 | Dimensional Fund Advisors LP | 13G/A | 3.9% | 1.14M | SEC |
| 3 | Oct 9, 2025 | Dimensional Fund Advisors LP | 13G | 5.1% | 1.47M | SEC |
| 4 | May 12, 2025 | Wasatch Advisors LP | 13G/A | 3.5% | 998.5K | SEC |
| 5 | Apr 23, 2025 | Blackrock, Inc. | 13G/A | 8.2% | 2.34M | SEC |
| 6 | Apr 14, 2025 | Portolan Capital Management, LLC | 13G | 5.7% | 1.61M | SEC |
| 7 | Jan 30, 2025 | The Vanguard Group | 13G/A | 6.5% | 1.83M | SEC |
| 8 | Nov 14, 2024 | Granahan Investment Management, LLC | 13G/A | 1.5% | 425.2K | SEC |
| 9 | Nov 13, 2024 | Wasatch Advisors LP | 13G/A | 6.6% | — | SEC |
| 10 | Jul 8, 2024 | Blackrock Inc. | 13G/A | 11.0% | 3.04M | SEC |
26 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Castle Biosciences Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Blackrock, Inc. | 2.98M | $73.23M |
| 2 | Rtw Investments, LP | 2.76M | $67.72M |
| 3 | Principal Financial Group Inc | 1.77M | $43.45M |
| 4 | Portolan Capital Management, LLC | 1.35M | $33.15M |
| 5 | Dimensional Fund Advisors LP | 1.04M | $25.52M |
| 6 | Summit Partners Public Asset Management, LLC | 940.7K | $23.09M |
| 7 | Allianz Asset Management Gmbh | 811.3K | $19.92M |
| 8 | State Street Corp | 769.1K | $18.88M |
| 9 | Geode Capital Management, LLC | 728.1K | $17.88M |
| 10 | Aigh Capital Management LLC | 590.6K | $14.50M |