Boundless Bio, Inc. - BOLD
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ARCH Venture Management, LLC | History | New | 2,694,095 | 6,735 | 0.61% | — | 1 | +2,694,095 | New | Q2 2026 | Aug 14, 2026 |
| FMR LLC | History | Reduced | 2,581,055 | 6,452 | 0.0% | 0.0% | 2 | -114,400 | -4.24% | Q2 2026 | Aug 13, 2026 |
| TANG CAPITAL MANAGEMENT LLC | History | New | 2,559,875 | 6,399 | 0.29% | — | 3 | +2,559,875 | New | Q2 2026 | Aug 14, 2026 |
| ADAR1 Capital Management, LLC | History | New | 1,968,216 | 4,920 | 0.23% | — | 4 | +1,968,216 | New | Q2 2026 | Aug 14, 2026 |
| Cormorant Asset Management, LP | History | New | 1,000,000 | 2,500 | 0.13% | — | 5 | +1,000,000 | New | Q2 2026 | Aug 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | Added to | 614,923 | 1,537 | 0.0% | 0.0% | 6 | +17,731 | 2.97% | Q2 2026 | Aug 13, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | History | No change | 556,233 | 1,390 | 0.0% | 0.0% | 7 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Added to | 478,639 | 1,196 | 0.0% | 0.0% | 8 | +378,764 | 379.24% | Q2 2026 | Aug 14, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 471,570 | 1,178 | 0.0% | 0.0% | 9 | +72,570 | 18.19% | Q2 2026 | Aug 13, 2026 |
| Alyeska Investment Group, L.P. | History | No change | 300,000 | 750 | 0.0% | 0.0% | 10 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Affinity Asset Advisors, LLC | History | New | 250,000 | 625 | 0.03% | — | 11 | +250,000 | New | Q2 2026 | Aug 13, 2026 |
| RBF Capital, LLC | History | No change | 200,000 | 500 | 0.02% | 0.01% | 12 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Ensign Peak Advisors, Inc | History | Reduced | 159,835 | 399 | 0.0% | 0.0% | 13 | -27,665 | -14.75% | Q2 2026 | Aug 14, 2026 |
| Stonepine Capital Management, LLC | History | Reduced | 154,595 | 386 | 0.22% | 0.26% | 14 | -443,087 | -74.13% | Q2 2026 | Aug 17, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Added to | 146,757 | 365 | 0.0% | 0.0% | 15 | +134,147 | 1063.81% | Q2 2026 | Aug 13, 2026 |
| CITADEL ADVISORS LLC | History | Reduced | 145,049 | 362 | 0.0% | 0.0% | 16 | -1,197,082 | -89.19% | Q2 2026 | Sep 02, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | Added to | 128,000 | 320 | 0.01% | 0.0% | 17 | +77,500 | 153.47% | Q2 2026 | Aug 14, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 116,736 | 291 | 0.0% | 0.0% | 18 | -10,840 | -8.5% | Q2 2026 | Aug 12, 2026 |
| HRT FINANCIAL LP | History | New | 116,288 | 290 | 0.0% | — | 19 | +116,288 | New | Q2 2026 | Aug 14, 2026 |
| BlackRock, Inc. | History | Added to | 88,495 | 221 | 0.0% | 0.0% | 20 | +17,820 | 25.21% | Q2 2026 | Aug 07, 2026 |
| PRELUDE CAPITAL MANAGEMENT, LLC | History | New | 83,998 | 209 | 0.02% | — | 21 | +83,998 | New | Q2 2026 | Aug 14, 2026 |
| Rangeley Capital, LLC | History | New | 74,000 | 185 | 0.17% | — | 22 | +74,000 | New | Q2 2026 | Aug 14, 2026 |
| GSA CAPITAL PARTNERS LLP | History | Reduced | 72,353 | 181 | 0.01% | 0.01% | 23 | -24,471 | -25.27% | Q2 2026 | Aug 06, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | No change | 65,136 | 162 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| JANE STREET GROUP, LLC | History | New | 64,323 | 160 | 0.0% | — | 25 | +64,323 | New | Q2 2026 | Aug 14, 2026 |
| SUPERSTRING CAPITAL MANAGEMENT LP | History | New | 55,356 | 138 | 0.09% | — | 26 | +55,356 | New | Q2 2026 | Aug 14, 2026 |
| NORTHERN TRUST CORP | History | New | 34,824 | 87 | 0.0% | — | 27 | +34,824 | New | Q2 2026 | Aug 13, 2026 |
| XTX Topco Ltd | History | Reduced | 33,361 | 83 | 0.0% | 0.0% | 28 | -1,310 | -3.78% | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | History | Added to | 20,207 | 50 | 0.0% | 0.0% | 29 | +2,715 | 15.52% | Q2 2026 | Aug 14, 2026 |
| China Universal Asset Management Co., Ltd. | History | New | 16,900 | 42 | 0.0% | — | 30 | +16,900 | New | Q2 2026 | Jul 24, 2026 |
| STATE STREET CORP | History | No change | 15,962 | 39 | 0.0% | 0.0% | 31 | 0 | 0.0% | Q2 2026 | Sep 22, 2026 |
| MORGAN STANLEY | History | No change | 13,000 | 32 | 0.0% | 0.0% | 32 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Caitong International Asset Management Co., Ltd | History | Added to | 10,443 | 26 | 0.0% | — | 33 | +10,440 | 348000.0% | Q2 2026 | Aug 04, 2026 |
| Pure Financial Advisors, LLC | History | No change | 10,100 | 25 | 0.0% | 0.0% | 34 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| SECTORAL ASSET MANAGEMENT INC | History | Closed out | 0 | 0 | — | 0.62% | — | -678,574 | -100.0% | Q2 2026 | Aug 14, 2026 |
| Sio Capital Management, LLC | History | Closed out | 0 | 0 | — | 0.03% | — | -163,679 | -100.0% | Q2 2026 | Aug 14, 2026 |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | History | Closed out | 0 | 0 | — | 0.01% | — | -85,792 | -100.0% | Q2 2026 | Aug 11, 2026 |
| Walleye Capital LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -39,624 | -100.0% | Q2 2026 | Aug 03, 2026 |
| Squarepoint Ops LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -16,374 | -100.0% | Q2 2026 | Aug 14, 2026 |
| CITIGROUP INC | History | Closed out | 0 | 0 | — | 0.0% | — | -8,837 | -100.0% | Q2 2026 | Aug 03, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 348 | 0 | — | 0.0% | — | -2,023 | -85.32% | Q2 2026 | Aug 11, 2026 |
| Vanguard Global Advisers, LLC | History | Closed out | 0 | 0 | — | — | — | -429 | -100.0% | Q2 2026 | Aug 13, 2026 |
| Optiver Holding B.V. | History | Closed out | 0 | 0 | — | — | — | -168 | -100.0% | Q2 2026 | Aug 12, 2026 |
| JPMORGAN CHASE & CO | History | Added to | 179 | 0 | — | — | — | +10 | 5.92% | Q2 2026 | Aug 12, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 176 | 0 | — | — | — | -2 | -1.12% | Q2 2026 | Aug 13, 2026 |
| Financial Management Professionals, Inc. | History | New | 2 | 0 | — | — | — | +2 | New | Q2 2026 | Jul 09, 2026 |
| SBI Securities Co., Ltd. | History | Added to | 2 | 0 | — | — | — | +1 | 100.0% | Q2 2026 | Jul 22, 2026 |
| CWM, LLC | History | No change | 8 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| UBS Group AG | History | No change | 2 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |