Boundless BioBOLD
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 36 institutions reported holding Boundless Bio Inc. (BOLD) in their 13F filings, unchanged from Q4 2025. 4 opened new positions and 6 sold out. The largest holders were FMR LLC ($3.0M), Citadel Advisors ($1.5M) and Sectoral Asset Management Inc. ($746K). 3 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Boundless Bio Inc.
- CUSIP
- 10170A100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $29K |
| Exits | 6 | $282K |
All 13F filers, Q4 2025 → Q1 2026: 166,966 shares bought and 462,088 shares sold, net −295,122 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 36 holders
| FMR LLC | 0.00% | Add +0.4% | 2,695,455 | $3.0M |
| Citadel Advisors | 0.00% | Reduce -0.9% | 1,342,131 | $1.5M |
| Sectoral Asset Management Inc. | 0.62% | No change | 678,574 | $746K |
| Stonepine Capital Management, LLC | 0.58% | Reduce -15.8% | 597,682 | $657K |
| Vanguard Capital Management LLC | 0.00% | — | 597,192 | $657K |
| Wellington Management Group LLP | 0.00% | No change | 556,233 | $612K |
| Renaissance Technologies | 0.00% | Add +16.9% | 399,000 | $439K |
| Alyeska Investment Group, L.P. | 0.00% | No change | 300,000 | $330K |
| RBF Capital, LLC | 0.01% | No change | 200,000 | $220K |
| Ensign Peak Advisors, Inc | 0.00% | No change | 187,500 | $206K |
| Sio Capital Management, LLC | 0.03% | No change | 163,679 | $180K |
| Geode Capital Management, LLC | 0.00% | Add +35.6% | 127,576 | $140K |
| Millennium Management | 0.00% | Reduce -26.2% | 99,875 | $110K |
| Gsa Capital Partners LLP | 0.01% | Add +55.0% | 96,824 | $107K |
| Landscape Capital Management, L.L.C. | 0.01% | Reduce -32.8% | 85,792 | $94K |
| BlackRock, Inc. | 0.00% | Add +5.4% | 70,675 | $78K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 65,136 | $72K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 50,500 | $56K |
| Walleye Capital LLC | 0.00% | No change | 39,624 | $44K |
| XTX Topco Ltd | 0.00% | Reduce -12.4% | 34,671 | $38K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -6.5% | 17,492 | $19K |
| Squarepoint Ops LLC | 0.00% | New | 16,374 | $18K |
| State Street Corp. | 0.00% | No change | 15,962 | $18K |
| Morgan Stanley | 0.00% | No change | 13,000 | $14K |
| Acadian Asset Management LLC | 0.00% | No change | 12,610 | $12K |
| Pure Financial Advisors, LLC | 0.00% | New | 10,100 | $11K |
| Citigroup Inc. | 0.00% | Reduce -64.8% | 8,837 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -59.1% | 2,371 | $3K |
| Vanguard Global Advisers, LLC | 0.00% | — | 429 | $472 |
| BNP Paribas Financial Markets | 0.00% | Add +1.1% | 178 | $196 |
| Optiver Holding B.V. | 0.00% | No change | 168 | $185 |
| JPMorgan Chase & Co. | 0.00% | No change | 169 | $183 |
| Cwm, LLC | 0.00% | Reduce -11.1% | 8 | $9 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 3 | $3 |
| UBS Group AG | 0.00% | Reduce -91.3% | 2 | $2 |
| SBI Securities Co., Ltd. | 0.00% | New | 1 | $1 |
"% of holder's portfolio" is BOLD's weight in each manager's 13F, not the share of Boundless Bio Inc. the manager owns.