John Lister - 07 Nov 2025 Form 4 Insider Report for BillionToOne, Inc.

Role
Chief Administrative Officer
Signature
/s/ Thomas P. Lynch, Attorney-in-Fact
Issuer symbol
BLLN on Nasdaq
Transactions as of
07 Nov 2025
Net transactions value
$0
Form type
4
Filing time
12 Nov 2025, 18:09:23 UTC
Previous filing
05 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
LISTER JOHN Chief Administrative Officer C/O BILLIONTOONE, INC., 1035 O'BRIEN DRIVE, MENLO PARK /s/ Thomas P. Lynch, Attorney-in-Fact 12 Nov 2025 0001464741

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction BLLN Stock Option (right to buy) Other -133,300 -100% 0 07 Nov 2025 Common Stock 133,300 $23.15 Direct F1, F2
transaction BLLN Stock Option (right to buy) Other +133,300 133,300 07 Nov 2025 Class A Common Stock 133,300 $23.15 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.
F2 The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period, with 25% of the options vesting on July 7, 2026. The remaining 75%. vest and become exercisable in equal monthly installments over the following three years, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.