Boundless Bio BOLD Institutional Ownership

NASDAQ BOLD

$2.56 -0.05 (-1.92%)

At close: Sep 29, 2026 · 4:00 PM EDT

Institutions by Trading Activity

41 Institutions

Increased 24 58.5%

Unchanged 8 19.5%

Reduced 9 22.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

68.16%

▲+30.28 pp QoQ

Shares Held by Institutions

15.30Mn

of 22.45Mn outstanding

▲+104.22% QoQ

Shares Outstanding

22.45Mn

7.15Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+5 vs prior quarter

Net Shares Added (QoQ)

+7.81Mn

accumulated since last quarter

Value of Holdings

$39.94Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Boundless Bio, Inc. (NASDAQ:BOLD) is held by 41 institutional investors per 13F filings through June 2026.

Collectively, these holders controlled 68.2% of Boundless Bio's outstanding shares in June 2026, up from 37.9% in March 2026.
They increased total shares held in BOLD by 104.22% quarter over quarter, and investors in Boundless Bio decreased 4.65% from a year ago.
Activity in BOLD broke down as 24 buyers, 9 sellers, and 8 unchanged among 41 total holders.
Altogether, these fund groups held 15.3Mn shares in BOLD by June 2026, up by 7.81Mn shares quarter on quarter, and up 6.36Mn shares year over year.
As of June 30, 2026, ARCH Venture Management, LLC held the largest stake in Boundless Bio with 2.69Mn shares, accounting for 12.0% of total shares outstanding.
The biggest buyers of Boundless Bio for the quarter ending June 2026 included ARCH Venture Management, LLC (2.69Mn), TANG CAPITAL MANAGEMENT LLC (2.56Mn), ADAR1 Capital Management, LLC (1.97Mn), Cormorant Asset Management, LP (1.0Mn), MILLENNIUM MANAGEMENT LLC (378.76K).
Leading sellers of Boundless Bio shares for the quarter ending June 2026 were CITADEL ADVISORS LLC (1.2Mn), Stonepine Capital Management, LLC (443.09K), FMR LLC (114.4K), Ensign Peak Advisors, Inc (27.66K), GSA CAPITAL PARTNERS LLP (24.47K).
According to Business Quant data, leading holders of BOLD for June 2026 are ARCH Venture Management, LLC (2.69Mn), FMR LLC (2.58Mn), TANG CAPITAL MANAGEMENT LLC (2.56Mn), ADAR1 Capital Management, LLC (1.97Mn), Cormorant Asset Management, LP (1.0Mn), VANGUARD CAPITAL MANAGEMENT LLC (614.92K), WELLINGTON MANAGEMENT GROUP LLP (556.23K), MILLENNIUM MANAGEMENT LLC (478.64K), RENAISSANCE TECHNOLOGIES LLC (471.57K), Alyeska Investment Group, L.P. (300.0K).

Form 13F Holdings

41 Institutional Holders

Report period 30 Jun, 2026

Total shares held 15.30Mn

Of outstanding 68.16%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	ARCH Venture Management, LLC	0001274403	2,694,095	12.00%	▲2,694,095	0.00%	$6.74Mn
2	FMR LLC	0000315066	2,581,055	11.50%	▼114,400	-4.24%	$6.45Mn
3	TANG CAPITAL MANAGEMENT LLC	0001232621	2,559,875	11.40%	▲2,559,875	0.00%	$6.40Mn
4	ADAR1 Capital Management, LLC	0001940272	1,968,216	8.77%	▲1,968,216	0.00%	$4.92Mn
5	Cormorant Asset Management, LP	0001583977	1,000,000	4.45%	▲1,000,000	0.00%	$2.50Mn
6	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	614,923	2.74%	▲17,731	+2.97%	$1.54Mn
7	WELLINGTON MANAGEMENT GROUP LLP	0000902219	556,233	2.48%	0	0.00%	$1.39Mn
8	MILLENNIUM MANAGEMENT LLC	0001273087	478,639	2.13%	▲378,764	+379.24%	$1.20Mn
9	RENAISSANCE TECHNOLOGIES LLC	0001037389	471,570	2.10%	▲72,570	+18.19%	$1.18Mn
10	Alyeska Investment Group, L.P.	0001453072	300,000	1.34%	0	0.00%	$750.00K
11	Affinity Asset Advisors, LLC	0001773195	250,000	1.11%	▲250,000	0.00%	$625.00K
12	RBF Capital, LLC	0001134621	200,000	0.89%	▼200,000	-50.00%	$500.00K
13	Ensign Peak Advisors, Inc	0001454984	159,835	0.71%	▼27,665	-14.75%	$399.59K
14	Stonepine Capital Management, LLC	0001440771	154,595	0.69%	▼443,087	-74.13%	$386.49K
15	ACADIAN ASSET MANAGEMENT LLC	0000916542	146,757	0.65%	▲134,147	+1,063.81%	$365
16	CITADEL ADVISORS LLC	0001423053	145,049	0.65%	▼1,197,082	-89.19%	$362.62K
17	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	128,000	0.57%	▲77,500	+153.47%	$320.00K
18	GEODE CAPITAL MANAGEMENT, LLC	0001214717	116,736	0.52%	▼10,840	-8.50%	$291.84K
19	HRT FINANCIAL LP	0001475597	116,288	0.52%	▲116,288	0.00%	$290
20	BlackRock, Inc.	0002012383	88,495	0.39%	▲17,820	+25.21%	$221.24K

Showing 1 to 20 of 41 holders