Boundless Bio, Inc.

BOLDNASDAQHealthcare● Active

$1.43

+$0.01(+0.70%)

Market Cap$32123679

P/E Ratio—

52W High$1.68

52W Low$0.961

Avg Volume217K

Open$1.44

Beta0.97

Insider Trades Ownership Employees

Boundless Bio, Inc. (BOLD) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · BOLD · as of Jun 9, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Boundless Bio, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 9, 2026

BOLD insider buying and selling by quarter

BOLD insider selling · BOLD insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

2.2M1.1M0

2018 Q3

2018 Q4

2019 Q1

2019 Q2

2019 Q3

2019 Q4

2020 Q1

2025 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 9, 2026

Recent insider transactions

BOLD executive sell shares · BOLD board member insider trading · BOLD insider trading SEC filing

Showing 45 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Jan 15, 2020	Soloway Thomas P Executive Vice President, CFO	Other	183,384	$60.00	$11.00M⚡	0	Form 4
Jan 15, 2020	Patterson Matthew R CEO · Director	Other	171,814	$60.00	$10.31M⚡	0	Form 4
Jan 15, 2020	Holles Natalie C. President and COO	Other	104,439	$60.00	$6.27M⚡	0	Form 4
Jan 15, 2020	Goldberg Mark Alan Director	Other	1,500	$60.00	$90K	0	Form 4
Jan 15, 2020	Conner Edward R. SVP, Chief Medical Officer	Other	24,584	$60.00	$1.48M⚡	0	Form 4
Jan 8, 2020	Soloway Thomas P Executive Vice President, CFO	Option	6,219	$15.26	$95K	183,384	Form 4
Jan 8, 2020	Soloway Thomas P Executive Vice President, CFO	Option	144,669	$2.76	$400K	177,165	Form 4
Jan 8, 2020	Patterson Matthew R CEO · Director	Option	11,666	$15.26	$178K	261,458	Form 4
Jan 8, 2020	Patterson Matthew R CEO · Director	Option	11,824	$9.50	$112K	249,792	Form 4
Jan 8, 2020	Patterson Matthew R CEO · Director	Option	74,297	$2.19	$163K	237,968	Form 4
Jan 8, 2020	Patterson Matthew R CEO · Director	Option	64,751	$0.78	$51K	163,671	Form 4
Dec 26, 2019	Patterson Matthew R CEO · Director	Gift	12,500	—	—	98,920	Form 4
Dec 12, 2019	Soloway Thomas P Executive Vice President, CFO	Option	41,321	$2.76	$114K	53,954	Form 4
Dec 12, 2019	Soloway Thomas P Executive Vice President, CFO	Other	21,458	$59.37	$1.27M⚡	32,496	Form 4
Dec 12, 2019	Soloway Thomas P Executive Vice President, CFO	Other	8,681	$59.37	$515K	12,633	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Option	14,895	$24.74	$369K	193,367	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Option	74,117	$15.26	$1.13M⚡	171,581	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Other	88,928	$59.37	$5.28M⚡	104,439	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Option	5,715	$9.50	$54K	97,464	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Option	45,726	$2.76	$126K	91,749	Form 4
Dec 12, 2019	Holles Natalie C. President and COO	Other	8,681	$59.37	$515K	46,023	Form 4
Dec 12, 2019	Conner Edward R. SVP, Chief Medical Officer	Other	5,416	$59.37	$322K	24,584	Form 4
Dec 5, 2019	Soloway Thomas P Executive Vice President, CFO	Other	505	$59.21	$30K	21,314	Form 4
Dec 5, 2019	Patterson Matthew R CEO · Director	Other	1,974	$59.21	$117K	111,420	Form 4
Dec 5, 2019	Holles Natalie C. President and COO	Other	505	$59.21	$30K	54,704	Form 4

Soloway Thomas P

Executive Vice President, CFO

Other

Date

Jan 15

183,384

Price

$60.00

Value

$11.00M ⚡

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Other

Date

Jan 15

171,814

Price

$60.00

Value

$10.31M ⚡

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Other

Date

Jan 15

104,439

Price

$60.00

Value

$6.27M ⚡

View Form 4 on SEC.gov

Goldberg Mark Alan

Director

Other

Date

Jan 15

1,500

Price

$60.00

Value

$90K

View Form 4 on SEC.gov

Conner Edward R.

SVP, Chief Medical Officer

Other

Date

Jan 15

24,584

Price

$60.00

Value

$1.48M ⚡

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Option

Date

Jan 8

6,219

Price

$15.26

Value

$95K

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Option

Date

Jan 8

144,669

Price

$2.76

Value

$400K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Option

Date

Jan 8

11,666

Price

$15.26

Value

$178K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Option

Date

Jan 8

11,824

Price

$9.50

Value

$112K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Option

Date

Jan 8

74,297

Price

$2.19

Value

$163K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Option

Date

Jan 8

64,751

Price

$0.78

Value

$51K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Gift

Date

Dec 26

12,500

Price

—

Value

—

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Option

Date

Dec 12

41,321

Price

$2.76

Value

$114K

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Other

Date

Dec 12

21,458

Price

$59.37

Value

$1.27M ⚡

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Other

Date

Dec 12

8,681

Price

$59.37

Value

$515K

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Option

Date

Dec 12

14,895

Price

$24.74

Value

$369K

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Option

Date

Dec 12

74,117

Price

$15.26

Value

$1.13M ⚡

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Other

Date

Dec 12

88,928

Price

$59.37

Value

$5.28M ⚡

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Option

Date

Dec 12

5,715

Price

$9.50

Value

$54K

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Option

Date

Dec 12

45,726

Price

$2.76

Value

$126K

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Other

Date

Dec 12

8,681

Price

$59.37

Value

$515K

View Form 4 on SEC.gov

Conner Edward R.

SVP, Chief Medical Officer

Other

Date

Dec 12

5,416

Price

$59.37

Value

$322K

View Form 4 on SEC.gov

Soloway Thomas P

Executive Vice President, CFO

Other

Date

Dec 5

505

Price

$59.21

Value

$30K

View Form 4 on SEC.gov

Patterson Matthew R

CEO · Director

Other

Date

Dec 5

1,974

Price

$59.21

Value

$117K

View Form 4 on SEC.gov

Holles Natalie C.

President and COO

Other

Date

Dec 5

505

Price

$59.21

Value

$30K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About BOLD insider trading

BOLD insider trades

Boundless Bio, Inc. (BOLD) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including BOLD. Over the past 12 months, 0 insiders have filed transactions with the SEC. BOLD insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Boundless Bio, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

BOLD insider trading · 5 questions

The insiders of Boundless Bio, Inc. (BOLD) include executives and directors such as BOLD, among others. Over the past 12 months, 0 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

BOLD board member insider tradingwho are BOLD insidersBOLD insider rosterBoundless Bio, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026