Boundless Bio, Inc.

BOLD

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001782303

SEC filings (opens in a new tab)

In the last 90 days, Boundless Bio, Inc. insiders filed 5 open-market purchases and 1 sale; 40 institutions reported holding it in 13F filings for Q2 2026, worth $38.3M in total; no superinvestor holds it.

Key figures

Market capClose on Nov 10, 2026: $55.7M
Insider buysLast 90 days, $458.4K in total: 5
Insider sellsLast 90 days, $54.4K in total: 1
13F holdersQ2 2026, +5 vs. previous quarter: 40
13F valueReported value at the end of Q2 2026: $38.3M
Superinvestors holdingAt the end of Q2 2026: 0

Price chart

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Financials

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From SEC filings, in USD.

Revenue, FY2025: –; No comparable prior period
Net income, FY2025: -$58.2M; No comparable prior period
Free cash flow, FY2025: -$47.2M; No comparable prior period
Revenue, Q3 FY2026: –; No comparable prior period

Short interest

See short data

From FINRA, settlement date Oct 30, 2026.

Short interest: 790.3K; Shares sold short
Change: +1.82K; +0.2% vs. previous
Days to cover: 5.06; At average daily volume

Superinvestors holding BOLD, Q2 2026

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No superinvestor reported holding BOLD at the end of Q2 2026.

Latest insider trades

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Open-market purchases and sales by Boundless Bio, Inc. insiders from Form 4, newest first.

Insider trades
Filed (ET)	Trade date	Filing delay	Insider	Transaction	Shares	Avg price	Value	Holding change	Flags
Nov 10, 2026 (view filing)5:09 PM ET	Nov 6-10	4 days	Tang Kevin C and 1 other10% Owner	PPurchase	+1.95K	$2.40	+$4.68K	+0.1%3.04M after	2 lots
Nov 5, 2026 (view filing)6:14 PM ET	Nov 3-5	2 days	Tang Kevin C and 1 other10% Owner	PPurchase	+11.2K	$2.40	+$26.8K	+0.4%3.03M after	3 lots
Oct 29, 2026 (view filing)6:20 PM ET	Oct 27	2 days	Tang Kevin C and 1 other10% Owner	PPurchase	+10.7K	$2.40	+$25.7K	+0.4%3.02M after
Oct 26, 2026 (view filing)4:51 PM ET	Oct 22-26	4 days	Tang Kevin C and 1 other10% Owner	PPurchase	+21.6K	$2.39	+$51.6K	+0.7%3.01M after	3 lots
Oct 20, 2026 (view filing)5:49 PM ET	Oct 16-20	4 days	Tang Kevin C and 1 other10% Owner	PPurchase	+149.5K	$2.34	+$349.6K	+5.3%2.99M after	4 lots
Aug 28, 2026 (view filing)4:16 PM ET	Aug 26	2 days	Tang Kevin C and 1 other10% Owner	SSale	−18.3K	$2.97	−$54.4K	−0.6%2.84M after
Jul 21, 2026 (view filing)7:38 PM ET	Jul 17-21	4 days	Tang Kevin C and 1 other10% Owner	PPurchase	+4.86K	$2.44	+$11.9K	+0.2%2.86M after	3 lots
Jul 16, 2026 (view filing)8:10 PM ET	Jul 14-16	2 days	Tang Kevin C and 1 other10% Owner	PPurchase	+64.0K	$2.43	+$155.6K	+2.3%2.85M after	3 lots
Jul 13, 2026 (view filing)7:06 PM ET	Jul 9-13	4 days	Tang Kevin C and 1 other10% Owner	PPurchase	+91.6K	$2.42	+$222.1K	+3.4%2.79M after	3 lots
Jul 8, 2026 (view filing)8:06 PM ET	Jul 6-8	2 days	Tang Kevin C and 1 other10% Owner	PPurchase	+57.2K	$2.48	+$141.9K	+2.2%2.70M after	3 lots

Top 10 13F holders, Q2 2026

See all 40 holders

The largest institutional positions in Boundless Bio, Inc. at the end of Q2 2026; share changes are against Q1 2026.

Institutions holding BOLD in Q2 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
ARCH Venture Management, LLC	2,694,095	$6.74M	0.61%	+2,694,095	New
FMR LLC	2,581,055	$6.45M	0.00%	−114,400−4.2%	Reduced
Tang Capital Management LLC	2,559,875	$6.40M	0.29%	+2,559,875	New
ADAR1 Capital Management, LLC	1,968,216	$4.92M	0.23%	+1,968,216	New
Cormorant Asset Management, LP	1,000,000	$2.50M	0.13%	+1,000,000	New
Vanguard Capital Management LLC	614,923	$1.54M	0.00%	+17,731+3.0%	Added
Wellington Management Group LLP	556,233	$1.39M	0.00%	00.0%	Unchanged
Millennium Management LLC	478,639	$1.20M	0.00%	+378,764+379.2%	Added
Renaissance Technologies LLC	471,570	$1.18M	0.00%	+72,570+18.2%	Added
Alyeska Investment Group, L.P.	300,000	$750.0K	0.00%	00.0%	Unchanged

Holders of 5% or more of BOLD

See all 4 holders and filings

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Boundless Bio, Inc..

Largest holders of BOLD from 13D and 13G filings
Holder	Latest form	Stake	Change	First filed	Latest filing	Filing
FMR LLC	13G/A	12.00%2.68M shares	–	Apr 10, 20242 filings	Feb 5, 2026	SEC
Tang Capital Management LLC	13G	11.30%2.53M shares	New	Jun 29, 20261 filing	Jun 29, 2026	SEC
Hornby Zachary	13G	9.80%2.43M shares	New	Aug 27, 20261 filing	Aug 27, 2026	SEC
ADAR1 Capital Management, LLC	13G	8.80%1.97M shares	New	Aug 14, 20261 filing	Aug 14, 2026	SEC