Insider · CIK 0002088547

Sakakibara Shan Riku

Reports to the SEC for 1 company · MENLO PARK, CA

sec.gov

Transactions

Companies

Filings

CIK

0002088547

Forms 4 and 5

Insider transactions

29 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-09-10	BLLNBillionToOne, Inc.G Gift	Chief Product Officer	GGift	−3,500 sh	—	—	196,500
2026-07-31	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$140.21	−$561K	200,000
2026-07-09	BLLNBillionToOne, Inc.M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	+174 sh	$8.65	+$1,505.1	208,174
2026-07-09	BLLNBillionToOne, Inc.M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	+1,117 sh	$30.78	+$34.4K	209,291
2026-07-09	BLLNBillionToOne, Inc.M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	+1,355 sh	$30.78	+$41.7K	210,646
2026-07-09	BLLNBillionToOne, Inc.M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	+1,354 sh	$30.78	+$41.7K	212,000
2026-07-09	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$125.00	−$500K	208,000
2026-07-09	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−174 sh	$125.00	−$21.8K	207,826
2026-07-09	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−1,117 sh	$125.00	−$140K	206,709
2026-07-09	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−1,355 sh	$125.00	−$169K	205,354
2026-07-09	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−1,354 sh	$125.00	−$169K	204,000
2026-07-09	BLLNBillionToOne, Inc. · Stock Option (right to buy)M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	−174 sh	$8.65	−$1,505.1	35,826
2026-07-09	BLLNBillionToOne, Inc. · Stock Option (right to buy)M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	−1,117 sh	$30.78	−$34.4K	63,883
2026-07-09	BLLNBillionToOne, Inc. · Stock Option (right to buy)M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	−1,355 sh	$30.78	−$41.7K	62,528
2026-07-09	BLLNBillionToOne, Inc. · Stock Option (right to buy)M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	−1,354 sh	$30.78	−$41.7K	61,174
2026-06-24	BLLNBillionToOne, Inc.M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	+4,000 sh	$8.65	+$34.6K	216,000
2026-06-24	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$110.00	−$440K	212,000
2026-06-24	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$110.00	−$440K	208,000
2026-06-24	BLLNBillionToOne, Inc. · Stock Option (right to buy)M Exercise/Conversion	Chief Product Officer	MExercise/Conversion	−4,000 sh	$8.65	−$34.6K	36,000
2026-06-08	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$96.45	−$386K	216,000
2026-06-08	BLLNBillionToOne, Inc.S Sale	Chief Product Officer	SSale	−4,000 sh	$100.00	−$400K	212,000
2025-11-07	BLLNBillionToOne, Inc.J Other	Chief Product Officer	JOther	−220K sh	—	—	0
2025-11-07	BLLNBillionToOne, Inc.J Other	Chief Product Officer	JOther	+220K sh	—	—	220,000
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	−50K sh	—	—	0
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	+50K sh	—	—	50,000
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	−40K sh	—	—	0
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	+40K sh	—	—	40,000
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	−65K sh	—	—	0
2025-11-07	BLLNBillionToOne, Inc. · Stock Option (right to buy)J Other	Chief Product Officer	JOther	+65K sh	—	—	65,000

Recent filings

Accepted (ET)
Sep 144
Sakakibara Shan Riku0002088547-26-000010
SEC(opens sec.gov)
Aug 44
Sakakibara Shan Riku0002088547-26-000008
SEC(opens sec.gov)
Jul 134
Sakakibara Shan Riku0002088547-26-000006
SEC(opens sec.gov)
Jun 264
Sakakibara Shan Riku0002088547-26-000004
SEC(opens sec.gov)
Jun 104
Sakakibara Shan Riku0002088547-26-000002
SEC(opens sec.gov)

Companies

BillionToOne, Inc.Chief Product OfficerBLLN

Address

C/O BILLIONTOONE, INC. 1035 O'BRIEN DRIVE

MENLO PARK, CA, 94025