Boundless Bio, Inc.

Historical 13F Holders

Symbol
BOLD
CUSIP
10170A100
All holders as of
Q2 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 10170A100 since 12/18/2024, largest first.

Filer % of Class Filed
FMR LLC 13G/A
12.0% 2/5/2026
Event 12/31/2025
Tang Capital Management LLC 13G
11.3% 6/29/2026
Event 6/23/2026
Zachary Hornby 13G 9.8% 8/27/2026
Event 10/14/2025
ADAR1 Capital Management, LLC 13G
8.8% 8/14/2026
Event 6/30/2026
Under 5%, checked the "5 percent or less" box, or amended by a later filing (3)
Citadel Advisors LLC 13G/A
0.6% 8/14/2026
Event 6/30/2026
Nextech VI GP S.A.R.L. 13G/A
0% 2/17/2026
Event 12/31/2025
RA Capital Management, L.P. 13G/A
0% 8/14/2025
Event 6/30/2025

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q2 40 15.3 M $38.3 M
2026 Q1 36 8.49 M $9.33 M
2025 Q4 37 8.98 M $10.8 M
2025 Q3 36 9.71 M $11.9 M
2025 Q2 46 9.79 M $9.88 M
2025 Q1 55 17.0 M $419 M
2024 Q4 56 13.0 M $37.6 M
2024 Q3 57 13.3 M $46.1 M
2024 Q2 50 14.0 M $54.2 M
2024 Q1 44 14.6 M $209 M