Boundless Bio, Inc. - Common stock, par value $0.0001 per share (the "Shares") (BOLD) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2024 to Q3 2025

Type / Class
Equity / Common stock, par value $0.0001 per share (the "Shares")
Symbol
BOLD on Nasdaq
Shares outstanding
22,396,688
Price per share
$1.15
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
9,621,325
Total reported value
$11,833,310
% of total 13F portfolios
0%
Share change
-164,277
Value change
-$174,686
Number of holders
34
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Boundless Bio, Inc. - Common stock, par value $0.0001 per share (the "Shares") (BOLD) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
CITADEL ADVISORS LLC 6.4% $1,763,067 1,433,388 Kenneth Griffin 26 Nov 2025

As of 30 Sep 2025, 34 institutional investors reported holding 9,621,325 shares of Boundless Bio, Inc. - Common stock, par value $0.0001 per share (the "Shares") (BOLD). This represents 43% of the company’s total 22,396,688 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Boundless Bio, Inc. - Common stock, par value $0.0001 per share (the "Shares") (BOLD) together control 43% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
FMR LLC 14% 3,098,071 -0.86% 0% $3,810,627
Nextech Invest, Ltd. 5.5% 1,228,069 0% 0.23% $1,510,525
CITADEL ADVISORS LLC 3.9% 876,412 +5.5% 0% $1,077,986
SECTORAL ASSET MANAGEMENT INC 3% 678,574 0% 0.52% $834,646
VANGUARD GROUP INC 2.5% 569,657 +18% 0% $700,678
WELLINGTON MANAGEMENT GROUP LLP 2.5% 556,233 0% 0% $684,167
Stonepine Capital Management, LLC 1.8% 413,453 +289% 0.41% $508,547
Alyeska Investment Group, L.P. 1.3% 300,000 0% 0% $369,000
Redmile Group, LLC 1.1% 245,458 -58% 0.03% $301,913
RENAISSANCE TECHNOLOGIES LLC 1% 223,562 +85% 0% $274,981
RBF Capital, LLC 0.89% 200,000 0% 0.01% $246,000
NORTHERN TRUST CORP 0.85% 190,801 -8% 0% $234,685
Ensign Peak Advisors, Inc 0.84% 187,500 0% 0% $230,625
MILLENNIUM MANAGEMENT LLC 0.73% 164,091 -23% 0% $201,832
Sio Capital Management, LLC 0.73% 163,679 0% 0.05% $201,325
GEODE CAPITAL MANAGEMENT, LLC 0.46% 102,268 +74% 0% $125,788
Almitas Capital LLC 0.39% 86,808 -63% 0.02% $106,774
BlackRock, Inc. 0.29% 65,374 +1.7% 0% $80,410
Squarepoint Ops LLC 0.23% 50,771 +176% 0% $62,448
BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.23% 50,500 0% 0% $62,115
Walleye Capital LLC 0.18% 39,624 0% 0% $48,738
XTX Topco Ltd 0.13% 29,081 -27% 0% $35,770
Qube Research & Technologies Ltd 0.08% 18,047 -16% 0% $22,198
STATE STREET CORP 0.07% 15,962 0% 0% $19,633
MORGAN STANLEY 0.07% 15,501 -7.4% 0% $19,066

Institutional Holders of Boundless Bio, Inc. - Common stock, par value $0.0001 per share (the "Shares") (BOLD) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q3 9,621,325 $11,833,310 -$174,686 $1.23 34
2025 Q2 9,787,223 $9,883,853 -$4,661,742 $1.01 42
2025 Q1 13,012,498 $19,646,720 -$249,811 $1.51 52
2024 Q4 12,962,230 $37,589,318 -$1,674,987 $2.90 53
2024 Q3 13,118,367 $45,520,310 -$2,392,263 $3.47 53
2024 Q2 13,842,210 $53,441,361 -$15,664,810 $3.87 47
2024 Q1 14,512,563 $207,790,970 +$207,610,330 $14.25 42