Form 4 for BLLN BillionToOne, Inc.

Accepted 2025-11-12 00:00:00 ET · period of report 2025-11-07 · accession 0001193125-25-278131 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
DM	2025-11-12	2025-11-07	BLLN	ten Bosch John Roderick	See Remarks	J - Other	—	0	37.0K	New	—
D	2025-11-12	2025-11-07	BLLN	ten Bosch John Roderick	See Remarks	P - Purchase	$60.00	+800	37.8K	+2%	+$48.0K
DM	2025-11-12	2025-11-07	BLLN	ten Bosch John Roderick	See Remarks	J - Other	—	0	28.5K	New	—

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2025-11-07	J	D	37,000	—	0	D	—	—	(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 (the "Offering").
2	Common	Class A Common Stock	2025-11-07	P	A	800	$60.00	37,800	D	—	—
3	Common	Class A Common Stock	2025-11-07	J	A	37,000	—	37,000	D	—	—	(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 (the "Offering").
4	Derivative	Stock Option (right to buy)	2025-11-07	J	D	20,000	—	0	D	$2.80 · — to 2031-06-07	20,000 Common Stock	(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 (the "Offering"). (F3) The options are fully vested and exercisable.
5	Derivative	Stock Option (right to buy)	2025-11-07	J	A	20,000	—	20,000	D	$2.80 · — to 2031-06-07	20,000 Class A Common Stock	(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 (the "Offering"). (F3) The options are fully vested and exercisable.
6	Derivative	Stock Option (right to buy)	2025-11-07	J	D	15,000	—	0	D	$10.92 · — to 2032-08-01	15,000 Common Stock	(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 (the "Offering"). (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 April 1, 2022, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
7	Derivative	Stock Option (right to buy)	2025-11-07	J	A	15,000	—	15,000	D	$10.92 · — to 2032-08-01	15,000 Class A Common Stock	(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 (the "Offering"). (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 April 1, 2022, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
8	Derivative	Stock Option (right to buy)	2025-11-07	J	D	30,000	—	0	D	$15.17 · — to 2034-06-05	30,000 Common Stock	(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 (the "Offering"). (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 May 15, 2024, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
9	Derivative	Stock Option (right to buy)	2025-11-07	J	A	30,000	—	30,000	D	$15.17 · — to 2034-06-05	30,000 Class A Common Stock	(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 (the "Offering"). (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 May 15, 2024, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.
10	Derivative	Stock Option (right to buy)	2025-11-07	J	D	37,500	—	0	D	$30.78 · — to 2035-09-30	37,500 Common Stock	(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 (the "Offering"). (F6) 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.
11	Derivative	Stock Option (right to buy)	2025-11-07	J	A	37,500	—	37,500	D	$30.78 · — to 2035-09-30	37,500 Class A Common Stock	(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 (the "Offering"). (F6) 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.
12	Derivative	Stock Option (right to buy)	2025-11-07	J	D	28,500	—	0	D	$0.56 · — to 2030-09-30	28,500 Common Stock	(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 (the "Offering"). (F3) The options are fully vested and exercisable.
13	Derivative	Stock Option (right to buy)	2025-11-07	J	A	28,500	—	28,500	D	$0.56 · — to 2030-09-30	28,500 Class A Common Stock	(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 (the "Offering"). (F3) The options are fully vested and exercisable.