Stock

Boundless Bio, Inc.

BOLD · held by 36 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$10.4M

Holders

+0 new · −0 exited

Holders’ est. mark

−$622

Price effect on 3 books still in the name

Largest holder

$3.22M

Fidelity

Notable conviction

Share of each notable manager’s 13F book.

Renaissance Technologies0.0% · $409.7K
Citadel0.0% · $1.62M
Fidelity0.0% · $3.22M
State Street0.0% · $19.2K
Vanguard0.0% · $795.3K

Holder count by quarter

Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Q3 2025 Q4 2025 Q1 2026

Who holds it

Notable only

Investor	Shares	Value	Est. mark	Change
Fidelity	2.68M	$3.22M	—	Held
Citadel	1.35M	$1.62M	—	Held
Stonepine Capital Management, LLC	710.1K	$852.1K	—	Held
SECTORAL ASSET MANAGEMENT INC	678.6K	$814.3K	—	Held
Vanguard	662.8K	$795.3K	—	Held
WELLINGTON MANAGEMENT GROUP LLP	556.2K	$667.5K	—	Held
Renaissance Technologies	341.4K	$409.7K	—	Held
Alyeska Investment Group, L.P.	300K	$360K	—	Held
RBF Capital, LLC	200K	$240K	—	Held
NORTHERN TRUST CORP	189.5K	$227.4K	—	Held
Ensign Peak Advisors, Inc	187.5K	$225K	—	Held
Sio Capital Management, LLC	163.7K	$196.4K	—	Held
MILLENNIUM MANAGEMENT LLC	135.4K	$162.5K	—	Held
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	127.6K	$153.2K	—	Held
GEODE CAPITAL MANAGEMENT, LLC	94.1K	$112.9K	—	Held
BlackRock, Inc.	67K	$80.5K	—	Held
BRIDGEWAY CAPITAL MANAGEMENT, LLC	50.5K	$60.6K	—	Held
Walleye Capital LLC	39.6K	$47.5K	—	Held
XTX Topco Ltd	39.6K	$47.5K	—	Held
CITIGROUP INC	25.1K	$30.1K	—	Held
Qube Research & Technologies Ltd	18.7K	$22.4K	—	Held
State Street	16K	$19.2K	—	Held
JANE STREET GROUP, LLC	13.3K	$16K	—	Held
MORGAN STANLEY	13K	$15.6K	−$390	Cut−$3.47K
Abel Hall, LLC	12.9K	$15.4K	—	Held
Nolet Wealth Management, LLC	11.3K	$13.6K	—	Held
BANK OF AMERICA CORP /DE/	7.76K	$9.31K	−$232	Cut−$209
Tower Research Capital LLC (TRC)	5.8K	$6.96K	—	Held
BNP PARIBAS FINANCIAL MARKETS	176	$211	—	Held
JPMORGAN CHASE & CO	169	$203	—	Held
Optiver Holding B.V.	168	$202	—	Held
GSA CAPITAL PARTNERS LLP	62.5K	$75	—	Held
UBS Group AG	23	$27	—	Held
ACADIAN ASSET MANAGEMENT LLC	12.6K	$14	—	Held
BARCLAYS PLC	2	$2	$0	Held
CWM, LLC	9	$0	—	Held

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.