BOLD Boundless Bio, Inc.: institutional ownership and insider trading
43 funds reported holding $42.7M of Boundless Bio, Inc. in their latest 13F filings; in Q2 2026 funds net bought $17.0M, with 13 new positions and 8 funds selling out; over the last 12 months insiders bought $1.86M and sold $134K on the open market.
Famous investors holding BOLD
- Izzy Englander (Millennium Management): $1.20M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $1.18M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $363K, 0.0% of the portfolio
Largest institutional holders of BOLD
- ARCH Venture Management, LLC — $6.74M
- FMR LLC — $6.45M
- TANG CAPITAL MANAGEMENT LLC — $6.40M
- ADAR1 Capital Management, LLC — $4.92M
- Nextech Invest Ltd. — $3.56M
- Cormorant Asset Management, LP — $2.50M
- VANGUARD CAPITAL MANAGEMENT LLC — $1.54M
- WELLINGTON MANAGEMENT GROUP LLP — $1.39M
- MILLENNIUM MANAGEMENT LLC — $1.20M
- RENAISSANCE TECHNOLOGIES LLC — $1.18M
Recent BOLD insider trades
- Oct 20, 2026: Tang Kevin bought 149,474 shares ($350K)
- Aug 26, 2026: Tang Kevin sold 18,300 shares ($54.4K)
- Jul 21, 2026: Tang Kevin bought 4,863 shares ($11.9K)
- Jul 16, 2026: Tang Kevin bought 63,969 shares ($156K)
5%+ owners
- TANG CAPITAL MANAGEMENT, LLC: 11.3% (Schedule 13G, filed Jun 29, 2026)
- Zachary Hornby: 9.8% (Schedule 13G, filed Aug 27, 2026)
- ADAR1 Capital Management, LLC: 8.8% (Schedule 13G, filed Aug 14, 2026)