Boundless Bio, Inc.
BOLD- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001782303
In the last 90 days, Boundless Bio, Inc. insiders filed 5 open-market purchases and 2 sales; 40 institutions reported holding it in 13F filings for Q2 2026, worth $38.3M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Boundless Bio, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 36
- +1 vs. Q4 2025
- Shares held
- 8.49M
- +367.6K (+4.5%) vs. Q4 2025
- Total value
- $9.33M
- −$407.7K (−4.2%) vs. Q4 2025
- New holders
- 7
- 6 more added
- Sold out
- 6
- 10 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting BOLD on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 40 | $38.3M |
| Q1 2026 | 36 | $9.33M |
| Q4 2025 | 36 | $10.5M |
| Q3 2025 | 35 | $11.8M |
| Q2 2025 | 44 | $9.88M |
| Q1 2025 | 54 | $19.6M |
| Q4 2024 | 55 | $37.6M |
| Q3 2024 | 55 | $46.1M |
| Q2 2024 | 47 | $53.4M |
| Q1 2024 | 43 | $208.8M |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Boundless Bio, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| FMR LLC | 2,695,455 | $2.96M | 0.00% | +11,433+0.4% | Added |
| Citadel Advisors LLC | 1,342,131 | $1.48M | 0.00% | −11,773−0.9% | Reduced |
| Sectoral Asset Management Inc | 678,574 | $746.4K | 0.62% | 00.0% | Unchanged |
| Stonepine Capital Management, LLC | 597,682 | $657.5K | 0.58% | −112,389−15.8% | Reduced |
| Vanguard Capital Management LLC | 597,192 | $656.9K | 0.00% | +597,192 | New |
| Wellington Management Group LLP | 556,233 | $611.9K | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 399,000 | $438.9K | 0.00% | +57,600+16.9% | Added |
| Alyeska Investment Group, L.P. | 300,000 | $330.0K | 0.00% | 00.0% | Unchanged |
| RBF Capital, LLC | 200,000 | $220.0K | 0.01% | 00.0% | Unchanged |
| Ensign Peak Advisors, Inc | 187,500 | $206.3K | 0.00% | 00.0% | Unchanged |
| Sio Capital Management, LLC | 163,679 | $180.0K | 0.03% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 127,576 | $140.3K | 0.00% | +33,478+35.6% | Added |
| Millennium Management LLC | 99,875 | $109.9K | 0.00% | −35,535−26.2% | Reduced |
| Gsa Capital Partners LLP | 96,824 | $107.0K | 0.01% | +34,348+55.0% | Added |
| Landscape Capital Management, L.L.C. | 85,792 | $94.4K | 0.01% | −41,834−32.8% | Reduced |
| BlackRock, Inc. | 70,675 | $77.7K | 0.00% | +3,627+5.4% | Added |
| Vanguard Fiduciary Trust Co | 65,136 | $71.7K | 0.00% | +65,136 | New |
| Bridgeway Capital Management, LLC | 50,500 | $55.5K | 0.00% | 00.0% | Unchanged |
| Walleye Capital LLC | 39,624 | $43.6K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 34,671 | $38.1K | 0.00% | −4,906−12.4% | Reduced |
| Qube Research & Technologies Ltd | 17,492 | $19.2K | 0.00% | −1,215−6.5% | Reduced |
| Squarepoint Ops LLC | 16,374 | $18.0K | 0.00% | +16,374 | New |
| State Street Corp | 15,962 | $17.6K | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 13,000 | $14.3K | 0.00% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 12,610 | $12.0K | 0.00% | 00.0% | Unchanged |
| Pure Financial Advisors, Inc. | 10,100 | $11.1K | 0.00% | +10,100 | New |
| Citigroup Inc | 8,837 | $9.72K | 0.00% | −16,236−64.8% | Reduced |
| Tower Research Capital LLC (TRC) | 2,371 | $2.61K | 0.00% | −3,432−59.1% | Reduced |
| Vanguard Global Advisers, LLC | 429 | $472 | 0.00% | +429 | New |
| BNP Paribas Arbitrage, SA | 178 | $196 | 0.00% | +2+1.1% | Added |
| Optiver Holding B.V. | 168 | $185 | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 169 | $183 | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 8 | $9 | 0.00% | −1−11.1% | Reduced |
| Caitong International Asset Management Co., Ltd | 3 | $3 | 0.00% | +3 | New |
| UBS Group AG | 2 | $2 | 0.00% | −21−91.3% | Reduced |
| SBI Securities Co., Ltd. | 1 | $1 | 0.00% | +1 | New |
| Northern Trust Corp | 0 | $0 | 0.00% | −189,475−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −13,323−100.0% | Sold out |
| Abel Hall, LLC | 0 | $0 | 0.00% | −12,865−100.0% | Sold out |
| Nolet Wealth Management, LLC | 0 | $0 | 0.00% | −11,323−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −7,758−100.0% | Sold out |
| Barclays PLC | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |