Boundless Bio, Inc. - Common Stock, par value $0.0001 per share (BOLD) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2024 to Q4 2025

Type / Class
Equity / Common Stock, par value $0.0001 per share
Symbol
BOLD on Nasdaq
Shares outstanding
22,366,850
Price per share
$1.20
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
8,769,613
Total reported value
$10,522,431
% of total 13F portfolios
0%
Share change
-851,539
Value change
-$1,070,476
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 (BOLD) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
FMR LLC 12% $3,086,625 2,684,022 FMR LLC 31 Dec 2025
CITADEL ADVISORS LLC 6.4% $1,763,067 1,433,388 Kenneth Griffin 26 Nov 2025

As of 31 Dec 2025, 34 institutional investors reported holding 8,769,613 shares of Boundless Bio, Inc. - Common Stock, par value $0.0001 per share (BOLD). This represents 39% of the company’s total 22,366,850 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Boundless Bio, Inc. - Common Stock, par value $0.0001 per share (BOLD) together control 39% 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 12% 2,684,022 -13% 0% $3,220,826
CITADEL ADVISORS LLC 6.1% 1,353,904 +54% 0% $1,624,685
Stonepine Capital Management, LLC 3.2% 710,071 +72% 0.68% $852,085
SECTORAL ASSET MANAGEMENT INC 3% 678,574 0% 0.65% $814,289
VANGUARD GROUP INC 3% 662,757 +16% 0% $795,308
WELLINGTON MANAGEMENT GROUP LLP 2.5% 556,233 0% 0% $667,480
RENAISSANCE TECHNOLOGIES LLC 1.5% 341,400 +53% 0% $409,680
Alyeska Investment Group, L.P. 1.3% 300,000 0% 0% $360,000
RBF Capital, LLC 0.89% 200,000 0% 0.01% $240,000
NORTHERN TRUST CORP 0.85% 189,475 -0.69% 0% $227,370
Ensign Peak Advisors, Inc 0.84% 187,500 0% 0% $225,000
Sio Capital Management, LLC 0.73% 163,679 0% 0.03% $196,415
MILLENNIUM MANAGEMENT LLC 0.61% 135,410 -17% 0% $162,492
LANDSCAPE CAPITAL MANAGEMENT, L.L.C. 0.57% 127,626 0.01% $153,151
GEODE CAPITAL MANAGEMENT, LLC 0.42% 94,098 -8% 0% $112,917
BlackRock, Inc. 0.3% 67,048 +2.6% 0% $80,457
GSA CAPITAL PARTNERS LLP 0.28% 62,476 0.01% $75,000
BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.23% 50,500 0% 0% $60,600
Walleye Capital LLC 0.18% 39,624 0% 0% $47,549
XTX Topco Ltd 0.18% 39,577 +36% 0% $47,492
CITIGROUP INC 0.11% 25,073 0% $30,088
Qube Research & Technologies Ltd 0.08% 18,707 +3.7% 0% $22,448
STATE STREET CORP 0.07% 15,962 0% 0% $19,154
JANE STREET GROUP, LLC 0.06% 13,323 0% $15,988
MORGAN STANLEY 0.06% 13,000 -16% 0% $15,600

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

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 8,769,613 $10,522,431 -$1,070,476 $1.20 34
2025 Q3 9,621,325 $11,833,310 -$174,690 $1.23 34
2025 Q2 9,787,223 $9,883,853 -$4,661,743 $1.01 42
2025 Q1 13,012,498 $19,647,091 -$249,812 $1.51 52
2024 Q4 12,962,230 $37,589,408 -$2,220,511 $2.90 53
2024 Q3 13,275,578 $46,065,519 -$1,783,862 $3.47 54
2024 Q2 13,842,210 $53,440,888 -$15,936,188 $3.87 47
2024 Q1 14,582,563 $208,788,470 +$208,607,723 $14.25 43