ATAY OGUZHAN (See Remarks) reported 8 transactions at BILLIONTOONE, INC.

Review the transaction codes below to understand the nature of each event.

ATAY OGUZHAN

Filed: 11/12/2025ACC: 0001193125-25-278140

InsiderATAY OGUZHANCIK 2088549

→

IssuerBILLIONTOONE, INC.CIK 2070849

DirectorOfficer· See Remarks

Since Nov 2025

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

6.56M acquired · 6.56M disposed

Non-Derivative Transactions8

Common Stock

Direct

C · Conversion

+262.43K

Price / share

—

Trade value

—

% of position

New position

11/7/2025

0.00→262.43K

Common Stock

Direct

J · J

−262.43K

Price / share

—

Trade value

—

% of position

New position

11/7/2025

262.43K→0.00

Common Stock

Direct

J · J

−1.97M

Price / share

—

Trade value

—

% of position

New position

11/7/2025

1.97M→0.00

Common Stock

Indirect

J · J

−200K

Price / share

—

Trade value

—

% of position

New position

11/7/2025

200K→0.00

Class A Common Stock

Direct

J · J

+262.43K

Price / share

—

Trade value

—

% of position

New position

11/7/2025

0.00→262.43K

Class A Common Stock

Direct

J · J

+1.97M

Price / share

—

Trade value

—

% of position

748.8%

11/7/2025

262.43K→2.23M

Class A Common Stock

Indirect

J · J

+200K

Price / share

—

Trade value

—

% of position

New position

11/7/2025

0.00→200K

Class A Common Stock

Direct

J · J

−2.23M

Price / share

—

Trade value

—

% of position

New position

11/7/2025

2.23M→0.00

Total

Net shares

−1.97M

Net value

$0.00

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	11/7/2025	C · Conversion	+262.43K	—	—	New position	0.00	262.43K
Common Stock Direct	11/7/2025	J · J	−262.43K	—	—	New position	262.43K	0.00
Common Stock Direct	11/7/2025	J · J	−1.97M	—	—	New position	1.97M	0.00
Common Stock Indirect	11/7/2025	J · J	−200K	—	—	New position	200K	0.00
Class A Common Stock Direct	11/7/2025	J · J	+262.43K	—	—	New position	0.00	262.43K
Class A Common Stock Direct	11/7/2025	J · J	+1.97M	—	—	748.8%	262.43K	2.23M
Class A Common Stock Indirect	11/7/2025	J · J	+200K	—	—	New position	0.00	200K
Class A Common Stock Direct	11/7/2025	J · J	−2.23M	—	—	New position	2.23M	0.00
Total			−1.97M		$0.00

Derivative Transactions6

Series A-1 Convertible Preferred Stock

Direct

C · Conversion

Converts to

Common Stock

262.43K shares

−262.43K

Strike price

Held after

0.00

Exercisable

—

11/7/2025

Class B Common Stock

Direct

J · J

Converts to

Class A Common Stock

2.23M shares

+2.23M

Strike price

Held after

2.23M

Exercisable

—

11/7/2025

Stock Option (right to buy)

Direct

J · J

Converts to

Common Stock

640K shares

−640K

Strike price

2.8

Held after

0.00

Exercisable

—

11/7/2025

Stock Option (right to buy)

Direct

J · J

Converts to

Class A Common Stock

640K shares

+640K

Strike price

2.8

Held after

640K

Exercisable

—

11/7/2025

Stock Option (right to buy)

Direct

J · J

Converts to

Common Stock

1M shares

−1M

Strike price

20.04

Held after

0.00

Exercisable

—

11/7/2025

Stock Option (right to buy)

Direct

J · J

Converts to

Class A Common Stock

1M shares

+1M

Strike price

20.04

Held after

Exercisable

—

11/7/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Series A-1 Convertible Preferred Stock Direct	Common Stock262.43K shares	11/7/2025	C · Conversion	−262.43K		—	0.00
Class B Common Stock Direct	Class A Common Stock2.23M shares	11/7/2025	J · J	+2.23M		—	2.23M
Stock Option (right to buy) Direct	Common Stock640K shares	11/7/2025	J · J	−640K	2.8	—	0.00
Stock Option (right to buy) Direct	Class A Common Stock640K shares	11/7/2025	J · J	+640K	2.8	—	640K
Stock Option (right to buy) Direct	Common Stock1M shares	11/7/2025	J · J	−1M	20.04	—	0.00
Stock Option (right to buy) Direct	Class A Common Stock1M shares	11/7/2025	J · J	+1M	20.04	—	1M