TSAO DAVID (Chief Technology Officer) sold 95.2% of their position (20K shares) of BILLIONTOONE, INC. on the open market

Open‑market sale worth $2.05M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 11 sales

TSAO DAVID

Filed: 6/17/2026ACC: 0002087127-26-000002

InsiderTSAO DAVIDCIK 2087127

→

IssuerBILLIONTOONE, INC.CIK 2070849

DirectorOfficer· Chief Technology Officer

Since Nov 2025

-20K

Net shares

Net seller

$2.05M

Total sold

Open market trades

0B · 11S

Total transactions

20K acquired · 40K disposed

Non-Derivative Transactions13

Class A Common Stock

Direct

M · Option Exercise

+10K

Price / share

$2.80

Trade value

$28K

% of position

1000.0%

6/15/2026

1K→11K

Class A Common Stock

Direct

M · Option Exercise

+10K

Price / share

$2.80

Trade value

$28K

% of position

90.9%

6/15/2026

11K→21K

Class A Common Stock

Direct

S · Sale

−1.70K

Price / share

$100.37

Trade value

$171.03K

% of position

8.1%

6/15/2026

21K→19.30K

Class A Common Stock

Direct

S · Sale

−2.36K

Price / share

$101.55

Trade value

$239.77K

% of position

12.2%

6/15/2026

19.30K→16.93K

Class A Common Stock

Direct

S · Sale

−2.82K

Price / share

$102.77

Trade value

$289.41K

% of position

16.6%

6/15/2026

16.93K→14.12K

Class A Common Stock

Direct

S · Sale

−2.89K

Price / share

$103.68

Trade value

$299.54K

% of position

20.5%

6/15/2026

14.12K→11.23K

Class A Common Stock

Direct

S · Sale

−230.00

Price / share

$104.47

Trade value

$24.03K

% of position

2.0%

6/15/2026

11.23K→11K

Class A Common Stock

Direct

S · Sale

−600.00

Price / share

$98.74

Trade value

$59.25K

% of position

5.5%

6/15/2026

11K→10.40K

Class A Common Stock

Direct

S · Sale

−1K

Price / share

$100.05

Trade value

$100.05K

% of position

9.6%

6/15/2026

10.40K→9.40K

Class A Common Stock

Direct

S · Sale

−2.46K

Price / share

$101.37

Trade value

$249.47K

% of position

26.2%

6/15/2026

9.40K→6.94K

Class A Common Stock

Direct

S · Sale

−2.98K

Price / share

$102.60

Trade value

$305.54K

% of position

42.9%

6/15/2026

6.94K→3.96K

Class A Common Stock

Direct

S · Sale

−2.40K

Price / share

$103.63

Trade value

$248.50K

% of position

60.5%

6/15/2026

3.96K→1.56K

Class A Common Stock

Direct

S · Sale

−563.00

Price / share

$104.32

Trade value

$58.73K

% of position

36.0%

6/15/2026

1.56K→1K

Total

Net shares

+0.00

Net value

-$1.99M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	6/15/2026	M · Option Exercise	+10K	$2.80	$28K	1000.0%	1K	11K
Class A Common Stock Direct	6/15/2026	M · Option Exercise	+10K	$2.80	$28K	90.9%	11K	21K
Class A Common Stock Direct	6/15/2026	S · Sale	−1.70K	$100.37	$171.03K	8.1%	21K	19.30K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.36K	$101.55	$239.77K	12.2%	19.30K	16.93K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.82K	$102.77	$289.41K	16.6%	16.93K	14.12K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.89K	$103.68	$299.54K	20.5%	14.12K	11.23K
Class A Common Stock Direct	6/15/2026	S · Sale	−230.00	$104.47	$24.03K	2.0%	11.23K	11K
Class A Common Stock Direct	6/15/2026	S · Sale	−600.00	$98.74	$59.25K	5.5%	11K	10.40K
Class A Common Stock Direct	6/15/2026	S · Sale	−1K	$100.05	$100.05K	9.6%	10.40K	9.40K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.46K	$101.37	$249.47K	26.2%	9.40K	6.94K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.98K	$102.60	$305.54K	42.9%	6.94K	3.96K
Class A Common Stock Direct	6/15/2026	S · Sale	−2.40K	$103.63	$248.50K	60.5%	3.96K	1.56K
Class A Common Stock Direct	6/15/2026	S · Sale	−563.00	$104.32	$58.73K	36.0%	1.56K	1K
Total			+0.00		-$1.99M

Derivative Transactions2

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

10K shares

−10K

Strike price

2.80

Held after

630K

Exercisable

—

6/15/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

10K shares

−10K

Strike price

2.80

Held after

620K

Exercisable

—

6/15/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Class A Common Stock10K shares	6/15/2026	M · Option Exercise	−10K	2.80	—	630K
Stock Option (right to buy) Direct	Class A Common Stock10K shares	6/15/2026	M · Option Exercise	−10K	2.80	—	620K