Boundless BioBOLD
13F holders, Q4 2025 (December 31)At the end of Q4 2025, 36 institutions reported holding Boundless Bio Inc. (BOLD) in their 13F filings, up 1 from Q3 2025. 5 opened new positions and 5 sold out. The largest holders were FMR LLC ($3.2M), Citadel Advisors ($1.6M) and Stonepine Capital Management, LLC ($852K). 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 Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 5 | $274K |
| Exits | 5 | $2.0M |
All 13F filers, Q3 2025 → Q4 2025: 1,229,796 shares bought and 2,081,514 shares sold, net −851,718 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 36 holders
| FMR LLC | 0.00% | Reduce -13.4% | 2,684,022 | $3.2M |
| Citadel Advisors | 0.00% | Add +54.5% | 1,353,904 | $1.6M |
| Stonepine Capital Management, LLC | 0.67% | Add +71.7% | 710,071 | $852K |
| Sectoral Asset Management Inc. | 0.65% | No change | 678,574 | $814K |
| Vanguard Group Inc. | 0.00% | Add +16.3% | 662,757 | $795K |
| Wellington Management Group LLP | 0.00% | No change | 556,233 | $667K |
| Renaissance Technologies | 0.00% | Add +52.7% | 341,400 | $410K |
| Alyeska Investment Group, L.P. | 0.00% | No change | 300,000 | $360K |
| RBF Capital, LLC | 0.01% | No change | 200,000 | $240K |
| Northern Trust Corp. | 0.00% | Reduce -0.7% | 189,475 | $227K |
| Ensign Peak Advisors, Inc | 0.00% | No change | 187,500 | $225K |
| Sio Capital Management, LLC | 0.03% | No change | 163,679 | $196K |
| Millennium Management | 0.00% | Reduce -17.5% | 135,410 | $162K |
| Landscape Capital Management, L.L.C. | 0.01% | New | 127,626 | $153K |
| Geode Capital Management, LLC | 0.00% | Reduce -8.0% | 94,098 | $113K |
| BlackRock, Inc. | 0.00% | Add +2.6% | 67,048 | $80K |
| Gsa Capital Partners LLP | 0.01% | New | 62,476 | $75K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 50,500 | $61K |
| Walleye Capital LLC | 0.00% | No change | 39,624 | $48K |
| XTX Topco Ltd | 0.00% | Add +36.1% | 39,577 | $47K |
| Citigroup Inc. | 0.00% | New | 25,073 | $30K |
| Qube Research & Technologies Ltd | 0.00% | Add +3.7% | 18,707 | $22K |
| State Street Corp. | 0.00% | No change | 15,962 | $19K |
| Jane Street Group, LLC | 0.00% | New | 13,323 | $16K |
| Morgan Stanley | 0.00% | Reduce -16.1% | 13,000 | $16K |
| Abel Hall, LLC | 0.00% | Reduce -0.5% | 12,865 | $15K |
| Acadian Asset Management LLC | 0.00% | Reduce -8.3% | 12,610 | $14K |
| Nolet Wealth Management, LLC | 0.01% | — | 11,323 | $14K |
| Bank of America Corp. | 0.00% | Add +0.3% | 7,758 | $9K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +123.8% | 5,803 | $7K |
| BNP Paribas Financial Markets | 0.00% | Reduce -49.6% | 176 | $211 |
| JPMorgan Chase & Co. | 0.00% | New | 169 | $203 |
| Optiver Holding B.V. | 0.00% | No change | 168 | $202 |
| UBS Group AG | 0.00% | Add +2200.0% | 23 | $27 |
| Barclays PLC | 0.00% | No change | 2 | $2 |
| Cwm, LLC | 0.00% | Reduce -40.0% | 9 | $0 |
"% of holder's portfolio" is BOLD's weight in each manager's 13F, not the share of Boundless Bio Inc. the manager owns.