Institutional Ownership
Boundless Bio Inc
CUSIP 10170A100COMBOLDQ1 2026
13D / 13G Filings
9
Schedule 13D/13G on record
Beneficial Filers
8
Distinct reporting persons
Largest Stake
14.7%
Max % of class reported
Institutional Holders
33
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
9 filings · latest Feb 17, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 17, 2026 | Nextech Vi Gp S.A. R.L. | 13G/A | — | 913.31M | SEC |
| 2 | Feb 5, 2026 | Fmr LLC | 13G/A | 12.0% | 2.68M | SEC |
| 3 | Dec 4, 2025 | Citadel Advisors LLC | 13G | 6.4% | 1.43M | SEC |
| 4 | Aug 14, 2025 | Ra Capital Management, L.P. | 13G/A | — | 913.30M | SEC |
| 5 | Oct 29, 2024 | Arch Venture Fund Ix, L.P. | 13D | 12.1% | 2.69M | SEC |
| 6 | Apr 12, 2024 | Ra Capital Management, L.P. | 13G | 9.8% | 2.18M | SEC |
| 7 | Apr 12, 2024 | Nextech Vi Gp S.A.R.L. | 13G | 5.5% | 1.23M | SEC |
| 8 | Apr 10, 2024 | Fmr LLC | 13G | 14.7% | — | SEC |
| 9 | Apr 9, 2024 | Bayer Healthcare LLC | 13G | 7.3% | 1.62M | SEC |
Top Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Fmr LLC | 2.70M | $2.96M |
| 2 | Citadel Advisors LLC | 1.34M | $1.48M |
| 3 | Sectoral Asset Management Inc | 678.6K | $746.4K |
| 4 | Stonepine Capital Management, LLC | 597.7K | $657.5K |
| 5 | Wellington Management Group LLP | 556.2K | $611.9K |
| 6 | Renaissance Technologies LLC | 399.0K | $438.9K |
| 7 | Alyeska Investment Group, L.P. | 300.0K | $330.0K |
| 8 | Rbf Capital, LLC | 200.0K | $220.0K |
| 9 | Ensign Peak Advisors, Inc | 187.5K | $206.3K |
| 10 | Sio Capital Management, LLC | 163.7K | $180.0K |