LYNCH THOMAS P. (See Remarks) sold 96.6% of their position (20K shares) of BILLIONTOONE, INC. on the open market

Open‑market sale worth $2.00M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 13 sales

LYNCH THOMAS P.

Filed: 9/10/2026ACC: 0002070849-26-000067

InsiderLYNCH THOMAS P.CIK 1659824

→

IssuerBILLIONTOONE, INC.CIK 2070849

Officer· See Remarks

Since Nov 2025

-20K

Net shares

Net seller

$2.00M

Total sold

Open market trades

0B · 13S

Total transactions

20K acquired · 40K disposed

Non-Derivative Transactions17

Class A Common Stock

Direct

M · Option Exercise

+11.04K

Price / share

$8.65

Trade value

$95.51K

% of position

1577.4%

9/8/2026

700.00→11.74K

Class A Common Stock

Direct

M · Option Exercise

+3.97K

Price / share

$11.55

Trade value

$45.84K

% of position

33.8%

9/8/2026

11.74K→15.71K

Class A Common Stock

Direct

M · Option Exercise

+1.66K

Price / share

$17.12

Trade value

$28.47K

% of position

10.6%

9/8/2026

15.71K→17.37K

Class A Common Stock

Direct

M · Option Exercise

+3.33K

Price / share

$30.78

Trade value

$102.37K

% of position

19.1%

9/8/2026

17.37K→20.70K

Class A Common Stock

Direct

S · Sale

−38.00

Price / share

$96.47

Trade value

$3.67K

% of position

0.2%

9/8/2026

20.70K→20.66K

Class A Common Stock

Direct

S · Sale

−1.94K

Price / share

$98.97

Trade value

$192.39K

% of position

9.4%

9/8/2026

20.66K→18.72K

Class A Common Stock

Direct

S · Sale

−8.29K

Price / share

$100.12

Trade value

$829.52K

% of position

44.3%

9/8/2026

18.72K→10.43K

Class A Common Stock

Direct

S · Sale

−775.00

Price / share

$100.83

Trade value

$78.14K

% of position

7.4%

9/8/2026

10.43K→9.66K

Class A Common Stock

Direct

S · Sale

−614.00

Price / share

$99.00

Trade value

$60.79K

% of position

6.4%

9/8/2026

9.66K→9.04K

Class A Common Stock

Direct

S · Sale

−3K

Price / share

$100.11

Trade value

$300.04K

% of position

33.1%

9/8/2026

9.04K→6.05K

Class A Common Stock

Direct

S · Sale

−358.00

Price / share

$100.82

Trade value

$36.09K

% of position

5.9%

9/8/2026

6.05K→5.69K

Class A Common Stock

Direct

S · Sale

−385.00

Price / share

$99.22

Trade value

$38.20K

% of position

6.8%

9/8/2026

5.69K→5.30K

Class A Common Stock

Direct

S · Sale

−1.13K

Price / share

$100.33

Trade value

$113.47K

% of position

21.3%

9/8/2026

5.30K→4.17K

Class A Common Stock

Direct

S · Sale

−147.00

Price / share

$101.41

Trade value

$14.91K

% of position

3.5%

9/8/2026

4.17K→4.03K

Class A Common Stock

Direct

S · Sale

−576.00

Price / share

$98.89

Trade value

$56.96K

% of position

14.3%

9/8/2026

4.03K→3.45K

Class A Common Stock

Direct

S · Sale

−2.52K

Price / share

$100.20

Trade value

$252.29K

% of position

73.0%

9/8/2026

3.45K→932.00

Class A Common Stock

Direct

S · Sale

−232.00

Price / share

$100.92

Trade value

$23.41K

% of position

24.9%

9/8/2026

932.00→700.00

Total

Net shares

+0.00

Net value

-$1.73M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	9/8/2026	M · Option Exercise	+11.04K	$8.65	$95.51K	1577.4%	700.00	11.74K
Class A Common Stock Direct	9/8/2026	M · Option Exercise	+3.97K	$11.55	$45.84K	33.8%	11.74K	15.71K
Class A Common Stock Direct	9/8/2026	M · Option Exercise	+1.66K	$17.12	$28.47K	10.6%	15.71K	17.37K
Class A Common Stock Direct	9/8/2026	M · Option Exercise	+3.33K	$30.78	$102.37K	19.1%	17.37K	20.70K
Class A Common Stock Direct	9/8/2026	S · Sale	−38.00	$96.47	$3.67K	0.2%	20.70K	20.66K
Class A Common Stock Direct	9/8/2026	S · Sale	−1.94K	$98.97	$192.39K	9.4%	20.66K	18.72K
Class A Common Stock Direct	9/8/2026	S · Sale	−8.29K	$100.12	$829.52K	44.3%	18.72K	10.43K
Class A Common Stock Direct	9/8/2026	S · Sale	−775.00	$100.83	$78.14K	7.4%	10.43K	9.66K
Class A Common Stock Direct	9/8/2026	S · Sale	−614.00	$99.00	$60.79K	6.4%	9.66K	9.04K
Class A Common Stock Direct	9/8/2026	S · Sale	−3K	$100.11	$300.04K	33.1%	9.04K	6.05K
Class A Common Stock Direct	9/8/2026	S · Sale	−358.00	$100.82	$36.09K	5.9%	6.05K	5.69K
Class A Common Stock Direct	9/8/2026	S · Sale	−385.00	$99.22	$38.20K	6.8%	5.69K	5.30K
Class A Common Stock Direct	9/8/2026	S · Sale	−1.13K	$100.33	$113.47K	21.3%	5.30K	4.17K
Class A Common Stock Direct	9/8/2026	S · Sale	−147.00	$101.41	$14.91K	3.5%	4.17K	4.03K
Class A Common Stock Direct	9/8/2026	S · Sale	−576.00	$98.89	$56.96K	14.3%	4.03K	3.45K
Class A Common Stock Direct	9/8/2026	S · Sale	−2.52K	$100.20	$252.29K	73.0%	3.45K	932.00
Class A Common Stock Direct	9/8/2026	S · Sale	−232.00	$100.92	$23.41K	24.9%	932.00	700.00
Total			+0.00		-$1.73M

Derivative Transactions4

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

11.04K shares

−11.04K

Strike price

8.65

Held after

68.36K

Exercisable

—

9/8/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

3.97K shares

−3.97K

Strike price

11.55

Held after

11.03K

Exercisable

—

9/8/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

1.66K shares

−1.66K

Strike price

17.12

Held after

8.34K

Exercisable

—

9/8/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Class A Common Stock

3.33K shares

−3.33K

Strike price

30.78

Held after

36.67K

Exercisable

—

9/8/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Class A Common Stock11.04K shares	9/8/2026	M · Option Exercise	−11.04K	8.65	—	68.36K
Stock Option (right to buy) Direct	Class A Common Stock3.97K shares	9/8/2026	M · Option Exercise	−3.97K	11.55	—	11.03K
Stock Option (right to buy) Direct	Class A Common Stock1.66K shares	9/8/2026	M · Option Exercise	−1.66K	17.12	—	8.34K
Stock Option (right to buy) Direct	Class A Common Stock3.33K shares	9/8/2026	M · Option Exercise	−3.33K	30.78	—	36.67K