Boundless BioBOLD
13F holders, Q2 2026 (June 30)At the end of Q2 2026, 40 institutions reported holding Boundless Bio Inc. (BOLD) in their 13F filings, up 4 from Q1 2026. 13 opened new positions and 8 sold out. The largest holders were ARCH Venture Management, LLC ($6.7M), FMR LLC ($6.5M) and Tang Capital Management LLC ($6.4M). 3 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Boundless Bio Inc.
- CUSIP
- 10170A100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 13 | $22.3M |
| Exits | 8 | $1.1M |
All 13F filers, Q1 2026 → Q2 2026: 9,629,575 shares bought and 2,814,357 shares sold, net +6,815,218 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 40 holders
| ARCH Venture Management, LLC | 0.61% | New | 2,694,095 | $6.7M |
| FMR LLC | 0.00% | Reduce -4.2% | 2,581,055 | $6.5M |
| Tang Capital Management LLC | 0.29% | New | 2,559,875 | $6.4M |
| ADAR1 Capital Management, LLC | 0.23% | New | 1,968,216 | $4.9M |
| Cormorant Asset Management, LP | 0.13% | New | 1,000,000 | $2.5M |
| Vanguard Capital Management LLC | 0.00% | Add +3.0% | 614,923 | $1.5M |
| Wellington Management Group LLP | 0.00% | No change | 556,233 | $1.4M |
| Millennium Management | 0.00% | Add +379.2% | 478,639 | $1.2M |
| Renaissance Technologies | 0.00% | Add +18.2% | 471,570 | $1.2M |
| Alyeska Investment Group, L.P. | 0.00% | No change | 300,000 | $750K |
| Affinity Asset Advisors, LLC | 0.03% | New | 250,000 | $625K |
| RBF Capital, LLC | 0.02% | No change | 200,000 | $500K |
| Ensign Peak Advisors, Inc | 0.00% | Reduce -14.8% | 159,835 | $400K |
| Stonepine Capital Management, LLC | 0.29% | Reduce -74.1% | 154,595 | $386K |
| Acadian Asset Management LLC | 0.00% | Add +1063.8% | 146,757 | $365K |
| Citadel Advisors | 0.00% | Reduce -89.2% | 145,049 | $363K |
| Bridgeway Capital Management, LLC | 0.01% | Add +153.5% | 128,000 | $320K |
| Geode Capital Management, LLC | 0.00% | Reduce -8.5% | 116,736 | $292K |
| HRT Financial LP | 0.00% | New | 116,288 | $290K |
| BlackRock, Inc. | 0.00% | Add +25.2% | 88,495 | $221K |
| Prelude Capital Management, LLC | 0.02% | New | 83,998 | $210K |
| Rangeley Capital, LLC | 0.18% | New | 74,000 | $185K |
| Gsa Capital Partners LLP | 0.01% | Reduce -25.3% | 72,353 | $181K |
| Vanguard Fiduciary Trust Co. | 0.00% | No change | 65,136 | $163K |
| Jane Street Group, LLC | 0.00% | New | 64,323 | $161K |
| Superstring Capital Management LP | 0.09% | New | 55,356 | $138K |
| Northern Trust Corp. | 0.00% | New | 34,824 | $87K |
| XTX Topco Ltd | 0.00% | Reduce -3.8% | 33,361 | $83K |
| Qube Research & Technologies Ltd | 0.00% | Add +15.5% | 20,207 | $51K |
| China Universal Asset Management Co., Ltd. | 0.00% | New | 16,900 | $42K |
| State Street Corp. | 0.00% | No change | 15,962 | $40K |
| Morgan Stanley | 0.00% | No change | 13,000 | $33K |
| Caitong International Asset Management Co., Ltd | 0.00% | Add +348000.0% | 10,443 | $26K |
| Pure Financial Advisors, LLC | 0.00% | No change | 10,100 | $25K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -85.3% | 348 | $870 |
| BNP Paribas Financial Markets | 0.00% | Reduce -1.1% | 176 | $440 |
| JPMorgan Chase & Co. | 0.00% | Add +5.9% | 179 | $439 |
| Financial Management Professionals, Inc. | 0.00% | New | 2 | $5 |
| UBS Group AG | 0.00% | No change | 2 | $5 |
| SBI Securities Co., Ltd. | 0.00% | Add +100.0% | 2 | $5 |
"% of holder's portfolio" is BOLD's weight in each manager's 13F, not the share of Boundless Bio Inc. the manager owns.