Thomas P. Lynch - 05 Nov 2025 Form 3 Insider Report for BillionToOne, Inc.

Role
General Counsel, Chief Compliance Officer and Secretary Exhibit 24 - Power of Attorney
Signature
/s/ Thomas P. Lynch
Issuer symbol
BLLN on Nasdaq
Transactions as of
05 Nov 2025
Net transactions value
$0
Form type
3
Filing time
05 Nov 2025, 21:30:03 UTC
Next filing
12 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Lynch Thomas P. General Counsel, Chief Compliance Officer and Secretary Exhibit 24 - Power of Attorney C/O BILLIONTOONE, INC., 1035 O'BRIEN DRIVE, MENLO PARK /s/ Thomas P. Lynch 05 Nov 2025 0001659824

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding BLLN Common Stock 600 05 Nov 2025 Direct F1

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
holding BLLN Stock Option (right to buy) 05 Nov 2025 Common Stock 79,400 $8.65 Direct F1, F2
holding BLLN Stock Option (right to buy) 05 Nov 2025 Common Stock 15,000 $11.55 Direct F1, F3
holding BLLN Stock Option (right to buy) 05 Nov 2025 Common Stock 10,000 $17.12 Direct F1, F4
holding BLLN Stock Option (right to buy) 05 Nov 2025 Common Stock 40,000 $30.78 Direct F1, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"), each share of Common Stock shall be reclassified into one share 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 October 24, 2022. 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.
F3 The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on October 1, 2023, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
F4 The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on October 6, 2024, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
F5 The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Remarks:

General Counsel, Chief Compliance Officer and Secretary Exhibit 24 - Power of Attorney