Quick Takeaways
- RTW INVESTMENTS, LP filed SCHEDULE 13G for CASTLE BIOSCIENCES, INC. Common Stock, $0.001 par value (CSTL).
- Disclosed ownership: 7.2%.
- Date of event: 31 Dec 2025.
RTW INVESTMENTS, LP - 31 Dec 2025 SCHEDULE 13G Report for CASTLE BIOSCIENCES, INC. Common Stock, $0.001 par value (CSTL)
- Filing Manager
- RTW INVESTMENTS, LP
- Reporting Manager
- RTW Investments, LP
- Symbol
- CSTL
- Shares outstanding
- 29,378,292 shares
- Disclosed Ownership
- 2,115,237 shares
- Ownership
- 7.2%
- Form type
- SCHEDULE 13G
- Filing time
- 17 Feb 2026, 08:31:14 UTC
- Date of event
- 31 Dec 2025
- Next filing
- 15 May 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"RTW INVESTMENTS, LP disclosed 7.2% ownership in CASTLE BIOSCIENCES, INC. Common Stock, $0.001 par value (CSTL) on 31 Dec 2025."
What Changed
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 17 Feb 2026, 08:31.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| RTW Investments, LP | 7.2% | 2,115,237 | 0 | 2,115,237 | /s/ Roderick Wong, M.D. | Roderick Wong, M.D., Managing Partner | |
| Roderick Wong | 7.2% | 2,115,237 | 0 | 2,115,237 | s/ Roderick Wong, M.D. | Roderick Wong, M.D. |