Sakakibara Shan Riku plan to sell securities of BillionToOne, Inc. under Form 144

Sakakibara Shan Riku filed Form 144 to notify SEC of plan to sell 8000 units of BillionToOne, Inc. securities around 2026-06-08, with aggregate market value of $785,800.00. The total outstanding units is 41442834.0. The amount planned to be sold represents 0.02% of total outstanding units;