NasdaqHealth CarePharmaceutical PreparationsLA JOLLA, CA

Boundless Bio, Inc. BOLD

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Estimated market cap $59.03M23.61M shares, shares as of Nov 6, 2026CIK 1782303

Insider trades, 12 mo

35 buys · 3 sells

$134.0K sold, open market

Congress trades, 24 mo

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No disclosed trades

13F holders, Q3 2026

22.4% of shares · 7 added

13F holders

…

Lobbying, 12 mo

—

No lobbying filings

Federal contracts, 12 mo

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None matched

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Latest 10-Q

Q3 2026

What changed in Boundless Bio, Inc.'s latest quarterly report, compared with the one before.

Filed Nov 10, 2026 · Quarter ended Sep 30, 2026

Compared with the 10-Q for the quarter ended Jun 30, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in Boundless Bio, Inc.'s latest quarterly report, compared with the one before.

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Insider trades

38 in 12 mo

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

Recent insider trades

Kevin Tang 10% owner	Nov 10 Form 4 ↗	Buy	+$598 249 sh @ $2.40	+1.4%
Kevin Tang 10% owner	Nov 6 Form 4 ↗	Buy	+$4,080 1,700 sh @ $2.40	-1.0%
Kevin Tang 10% owner	Nov 5 Form 4 ↗	Buy	+$20.1K 8,390 sh @ $2.40	+0.8%
Kevin Tang 10% owner	Nov 4 Form 4 ↗	Buy	+$1,241 517 sh @ $2.40	+5.8%
Kevin Tang 10% owner	Nov 3 Form 4 ↗	Buy	+$5,412 2,255 sh @ $2.40	+5.0%

All BOLD insider trades →Planned sales (Form 144): see notices

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

5.30M shares

25 funds report BOLD. Values checked against market prices.

Funds own 67% of shares (Q2 2026)

40 funds hold the stock.

Q3 2026: 22% · 5,560 of ~8,900 funds reported so far

Q2 202544%
Q3 202543%
Q4 202540%
Q1 202638%
Q2 202667%
Q3 2026 (so far)22%

Q3 2026. 5 new, 7 added to, 9 trimmed, 20 exited since Q2 2026.

Top 13F holders
#
1	FMR LLC 13F ↗	2.56M	$6.4M	-0.6%
2	Vanguard Capital Management LLC 13F ↗	597,192	$1.5M	-2.9%
3	Renaissance Technologies LLC 13F ↗	493,500	$1.2M	+4.7%
4	Acadian Asset Management LLC 13F ↗	347,173	$871.0K	+136.6%
5	China Universal Asset Management Co., Ltd. 13F ↗	233,300	$597.2K	+1280.5%
6	RBF Capital, LLC 13F ↗	200,000	$502.0K	unchanged
7	Ensign Peak Advisors, Inc 13F ↗	133,594	$335.3K	-16.4%
8	Geode Capital Management, LLC 13F ↗	129,672	$325.5K	+11.1%
9	Vanguard Fiduciary Trust Co 13F ↗	108,415	$272.1K	+66.4%
10	State Street Corp 13F ↗	100,662	$252.7K	+530.6%

One of these funds reports its values in thousands of dollars; its figures are shown in dollars.

Download CSV Every fund that holds BOLD, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What Boundless Bio, Inc. and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What Boundless Bio, Inc. and its lobbying firms report each quarter.

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Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report

Funds holding the stock by quarter

Q1 2024	43	—	14.58M	$208.8M
Q2 2024	47	+4	13.84M	$53.5M
Q3 2024	55	+8	13.29M	$46.1M
Q4 2024	55	0	12.96M	$37.6M
Q1 2025	54	-1	16.97M	$419.0M
Q2 2025	44	-10	9.79M	$9.9M
Q3 2025	35	-9	9.71M	$11.9M
Q4 2025	36	+1	8.98M	$10.8M
Q1 2026	36	0	8.49M	$9.3M
Q2 2026	40	+4	15.30M	$38.3M
Q3 2026	25	-15	5.30M	$13.3M

Each point is a quarter-end, from Q1 2024 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (10170A100). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q1 2024) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes7 in 12 mo 8-K events1 in 90 days Patents2 patents granted Short interestFINRA · updated Oct 15 Planned insider salesNone in 12 mo Executive payNone on record Wikipedia attentionNone on record SEC enforcementNone on record Clinical trials0 active Pending deal1 deal filed lately IPO history1 registration Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: Boundless Bio, Inc.
Address: 11099 NORTH TORREY PINES ROAD, SUITE 150, LA JOLLA, CA 92037
Phone: (858) 766-9912
Fiscal year ends: Dec 31
Filer category: Non-accelerated filer, smaller reporting company, emerging growth company
Incorporated in: DE
Listed as: BOLD (Nasdaq)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$2.50+$0.04 (+1.63%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $2.31 · High $2.50Nov 13, 2026

Aug 13, 2026Low $2.31 · High $3.00Nov 13, 2026

Nov 13, 2025Low $1.05 · High $3.00Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.