Boundless Bio, Inc. - BOLD

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q2 2026 · Compare: Q1 2026
13D/13G major owners: Ownership tab.
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