144
0002088549
XXXXXXXX
LIVE
0002070849
BillionToOne, Inc.
001-42934
1035 O'BRIEN DRIVE
MENLO PARK
CA
94025
650-460-2551
Atay Oguzhan
Officer
Director
Class A
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
12500
1576275.93
41442834
07/09/2026
NASDAQ
Class A
07/09/2026
Stock Option Exercise
Issuer
N
12500
07/09/2026
Cash
N
Oguzhan Atay
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
06/08/2026
26250
2563632.00
Ezgi N. Akcinar Atay
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
06/08/2026
12500
1227812.50
Atay 2021 Dynasty Trust
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
06/08/2026
2500
245562.50
Oguzhan Atay
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
07/06/2026
26500
3203733.13
Ezgi N. Akcinar Atay
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
07/06/2026
12500
1525645.67
Atay 2021 Dynasty Trust
1035 O'Brien Drive
Menlo Park
CA
94025
Class A
07/06/2026
2500
300000.00
There are sales within the past 3 months occurred in the account of Ezgi N. Akcinar Atay, who is the spouse of Oguzhan Atay. Additionally, there are sales within the past 3 months which occurred in the Atay 2021 Dynasty Trust which were made by Icontrust Llc, trustee on the account. Oguzhan Atay is an account stakeholder in the Atay 2021 Dynasty Trust.
07/09/2026
03/06/2026
/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Oguzhan Atay