CSTL CASTLE BIOSCIENCES INC: institutional ownership and insider trading
189 funds reported holding $760M of CASTLE BIOSCIENCES INC in their latest 13F filings; in Q2 2026 funds net sold $6.59M, with 20 new positions and 30 funds selling out; over the last 12 months insiders bought $0 and sold $19.4M on the open market.
Famous investors holding CSTL
- Renaissance Technologies (Renaissance Technologies): $8.85M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $6.33M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $4.90M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $2.69M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $2.39M, 0.0% of the portfolio
Largest institutional holders of CSTL
- VANGUARD GROUP INC — $85.6M
- BlackRock, Inc. (BLK) — $78.5M
- RTW INVESTMENTS, LP — $66.3M
- PRINCIPAL FINANCIAL GROUP INC (PFG) — $41.2M
- VANGUARD CAPITAL MANAGEMENT LLC — $29.3M
- ACADIAN ASSET MANAGEMENT LLC — $21.9M
- Allianz Asset Management GmbH — $21.0M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $20.1M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC — $19.7M
- STATE STREET CORP (STT, STT-PG) — $19.6M
Recent CSTL insider trades
- Oct 19, 2026: Maetzold Derek J sold 14,496 shares ($463K)
- Oct 12, 2026: Juvenal Tobin W sold 3,288 shares ($111K)
- Oct 5, 2026: Maetzold Derek J sold 14,496 shares ($516K)
- Oct 1, 2026: Oelschlager Kristen M sold 4,153 shares ($149K)
5%+ owners
- RTW Investments, LP: 9.3% (Schedule 13G/A, filed May 15, 2026)