Boundless Bio Inc

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Boundless Bio Inc
TickerBOLD
CIK #0001782303
CUSIP05070R104
SectorLife Sciences - Pharmaceutical Preparations
Address9880 Campus Point Drive Suite 120, San Diego, CA 92121
Source [EDGAR]
Reg D Offering (Form D) Filed Raised Terms
Boundless Bio Inc 2023-08-15 100.0 M Exemption: 506(b) · Duration: One year or less · Revenue: Decline to Disclose
CIK Filing 2011 - 2026
[0001782303] 10-K
[0001782303] 10-Q
[0001782303] 3
[0001782303] 4
[0001782303] 8-K
[0001782303] D
[0001782303] SC 13D
[0001782303] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Tang Capital Management LLC Boundless Bio Inc [2026-06-29] 0.0
Citadel Advisors LLC Boundless Bio Inc [2025-12-04] 0.0
Arch Venture Fund IX LP Boundless Bio Inc [2024-10-29] 12.1
Nextech VI GP SARL Boundless Bio Inc [2024-04-12] 5.5
RA Capital Management LP Boundless Bio Inc [2024-04-12] 0.8
FMR LLC Boundless Bio Inc [2024-04-10] 0.0
Bayer Healthcare LLC Boundless Bio Inc [2024-04-09] 7.3
Form 3/4/5 Filer 2011 - 2026
Tang Capital Management LLC
Tang Kevin
Boundless Bio Inc
Arch Venture Partners X LLC
Arch Venture Partners IX LLC
Arch Venture Partners IX Overage LP
Arch Venture Fund IX Overage LP
Arch Venture Partners IX LP
Arch Venture Fund X Overage LP
Arch Venture Fund IX LP
Arch Venture Partners X Overage LP
Bybee Clinton
Burow Kristina
Nelsen Robert
Gillis Steven
Crandell Keith
Christensen James
Lew Jennifer
Whiting Nancy
Lim Jonathan E
Oien Jessica
Doebele Robert
Hassig Christian
Hornby Zachary
Hinkle David A
Brennan Christine
Rubin Jami
Wagner Klaus W
Abdollahian Neil
Shah Rajeev M
RA Capital Healthcare Fund LP
RA Capital Nexus Fund II LP
RA Capital Management LP
Kolchinsky Peter
Wellington Biomedical Innovation Master Investors Cayman I
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Hassig Christian
Stock Option (right to buy) · derivative
2026-01-23 Grant 230,000 $0.00
Hinkle David A
Stock Option (right to buy) · derivative
2026-01-23 Grant 140,000 $0.00
Oien Jessica
Stock Option (right to buy) · derivative
2026-01-23 Grant 220,000 $0.00
Hornby Zachary
Stock Option (right to buy) · derivative
2026-01-23 Grant 600,000 $0.00
Doebele Robert
Stock Option (right to buy) · derivative
2026-01-23 Grant 230,000 $0.00
Whiting Nancy
Stock Option (right to buy) · derivative
2025-06-23 Grant 16,000 $0.00
Brennan Christine
Stock Option (right to buy) · derivative
2025-06-23 Grant 16,000 $0.00
Christensen James
Stock Option (right to buy) · derivative
2025-06-23 Grant 16,000 $0.00
Lew Jennifer
Stock Option (right to buy) · derivative
2025-06-23 Grant 16,000 $0.00
Lim Jonathan E
Stock Option (right to buy) · derivative
2025-06-23 Grant 24,000 $0.00
Burow Kristina
Stock Option (right to buy) · derivative
2025-06-23 Grant 16,000 $0.00
Doebele Robert
Stock Option · derivative
2025-02-03 Grant 180,000 $0.00
Oien Jessica
Stock Option · derivative
2025-01-22 Grant 90,000 $0.00
Hornby Zachary
Stock Option · derivative
2025-01-22 Grant 295,000 $0.00
Hassig Christian
Stock Option · derivative
2025-01-22 Grant 95,000 $0.00
Hinkle David A
Stock Option · derivative
2025-01-22 Grant 65,000 $0.00
Oien Jessica
Stock Option · derivative
2024-08-19 Grant 32,051
Oien Jessica
Stock Option · derivative
2024-08-19 Grant 29,148
Oien Jessica
Stock Option · derivative
2024-08-19 Disposed to issuer 42,051
Oien Jessica
Stock Option · derivative
2024-08-19 Disposed to issuer 26,090
showing 20 of 139 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 36 8,485,823
2025-12-31 36 8,980,945
2025-09-30 35 9,708,148
2025-06-30 45 9,787,419
2025-03-31 55 16,971,428
2024-12-31 56 12,962,623
2024-09-30 56 13,285,788
2024-06-30 48 13,844,899
2024-03-31 44 14,581,903
2021-06-30 1 0
2021-03-31 1 0
2020-12-31 1 0
Form 13F Holdings
Firm Period DFND Voting Shares
Financial Management Professionals Inc [2026-06-30] SOLE 0 2
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