Company · Ownership research

Boundless Bio, Inc. BOLD

CIK 0001782303 · CUSIP 10170A100

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

This page lists the top 20 of 36 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	FMR LLC CIK 315066 · View history	$3.22M 2,684,022 shares	0.00%	-414.05K(-13.40%)Reduced	SEC filing ↗ Feb 17, 2026	▾
02	CITADEL ADVISORS LLC CIK 1423053 · View history	$1.62M 1,353,904 shares	0.00%	+477.49K(+54.50%)Added	SEC filing ↗ Feb 17, 2026	▾
03	Stonepine Capital Management, LLC CIK 1440771 · View history	$852.09K 710,071 shares	0.67%	+296.62K(+71.70%)Added	SEC filing ↗ Feb 13, 2026	▾
04	Sectoral Asset Management Inc CIK 1274413 · View history	$814.29K 678,574 shares	0.65%	0(0.00%)Unchanged	SEC filing ↗ Feb 9, 2026	▾
05	VANGUARD GROUP INC CIK 102909 · View history	$795.31K 662,757 shares	0.00%	+93.10K(+16.30%)Added	SEC filing ↗ Jan 29, 2026	▾
06	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$667.48K 556,233 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
07	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$409.68K 341,400 shares	0.00%	+117.84K(+52.70%)Added	SEC filing ↗ Feb 12, 2026	▾
08	Alyeska Investment Group, L.P. CIK 1453072 · View history	$360.00K 300,000 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Feb 13, 2026	▾
09	RBF Capital, LLC CIK 1134621 · Amended · View history	$240.00K 200,000 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
10	NORTHERN TRUST CORP CIK 73124 · View history	$227.37K 189,475 shares	0.00%	-1.33K(-0.70%)Reduced	SEC filing ↗ Feb 17, 2026	▾
11	Ensign Peak Advisors, Inc CIK 1454984 · Amended · View history	$225.00K 187,500 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Feb 12, 2026	▾
12	Sio Capital Management, LLC CIK 1482416 · View history	$196.41K 163,679 shares	0.03%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
13	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$162.49K 135,410 shares	0.00%	-28.68K(-17.50%)Reduced	SEC filing ↗ Feb 17, 2026	▾
14	LANDSCAPE CAPITAL MANAGEMENT, L.L.C. CIK 1536186 · View history	$153.15K 127,626 shares	0.01%	+127.63KNew	SEC filing ↗ Feb 13, 2026	▾
15	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$112.92K 94,098 shares	0.00%	-8.17K(-8.00%)Reduced	SEC filing ↗ Feb 9, 2026	▾
16	BlackRock, Inc. CIK 2012383 · View history	$80.46K 67,048 shares	0.00%	+1.67K(+2.60%)Added	SEC filing ↗ Feb 12, 2026	▾
17	GSA CAPITAL PARTNERS LLP CIK 1362033 · View history	$75.00K 62,476 shares	0.01%	+62.48KNew	SEC filing ↗ Feb 6, 2026	▾
18	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$60.60K 50,500 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
19	Walleye Capital LLC CIK 1758720 · View history	$47.55K 39,624 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Feb 13, 2026	▾
20	XTX Topco Ltd CIK 1828301 · View history	$47.49K 39,577 shares	0.00%	+10.50K(+36.10%)Added	SEC filing ↗ Feb 17, 2026	▾

Showing 20 / 36 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

8,780,945

Not deduplicated across managers

Disclosed value

$10.54M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Boundless Bio, Inc. · Q4 2025

Explore all 36 reporting institutions.

This page includes 20 of 36 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.