0001782303 2026-08-28 2026-08-28 false 0001782303 8-K 2026-08-28 Boundless Bio, Inc. DE 001-41989 83-0751369 11099 North Torrey Pines Road Suite 150 La Jolla CA 92037 (858) 766-9912 true false false false Common Stock, par value $0.0001 per share BOLD NASDAQ true false