Notice of Proposed Sale · 144
BillionToOne, Inc.
BLLNNASDAQEQUITYCurrent
Notice of Proposed Sale
Structured filing — 144
primary_doc.xml
Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.
Proposed-sale notice
- Issuer
- BillionToOne, Inc.
- Issuer CIK
- 0002070849
- SEC file number
- 001-42934
- Phone
- 650-460-2551
- Person for whose account securities are to be sold
- Tsao David
- Relationships to issuer
- Officer · Director
- Street
- 1035 O'BRIEN DRIVE
- City
- MENLO PARK
- State / country code
- CA
- Postal code
- 94025
Securities proposed for sale
| Security | Proposed units | Aggregate market value | Units outstanding | Approximate sale date | Exchange | Broker / market maker |
|---|---|---|---|---|---|---|
| Class A | 10,000 | 928,600.00 | 42,644,388 | 08/10/2026 | NASDAQ | Fidelity Brokerage Services LLC |
Broker / market maker — proposed row 1, entry 1
- Name
- Fidelity Brokerage Services LLC
- Street
- 900 Salem Street
- City
- Smithfield
- State / country code
- RI
- Postal code
- 02917
Acquisition of securities to be sold
| Security | Acquired | Nature of acquisition | Acquired from | Amount acquired | Gift transaction | Payment date | Nature of payment |
|---|---|---|---|---|---|---|---|
| Class A | 08/10/2026 | Stock Option Exercise | Issuer | 10,000 | N | 08/10/2026 | Cash |
Sales reported in the preceding three months
| Seller | Security | Sale date | Amount sold | Gross proceeds |
|---|---|---|---|---|
| David Tsao | Class A | 06/15/2026 | 20,000 | 2,045,326.00 |
| David Tsao | Class A | 07/13/2026 | 20,000 | 2,497,698.00 |
Seller — prior-sale row 1, entry 1
- Name
- David Tsao
- Street
- 1035 OBrien Drive
- City
- Menlo Park
- State / country code
- CA
- Postal code
- 94025
Seller — prior-sale row 2, entry 1
- Name
- David Tsao
- Street
- 1035 OBrien Drive
- City
- Menlo Park
- State / country code
- CA
- Postal code
- 94025
Prior-sale reporting
- Nothing to report for the preceding three months
- N
Notice signature
- Notice date
- 08/10/2026
- Signed
- /s/ Jessica Spraker, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David Tsao.
- Plan adoption dates
- 03/06/2026