Bosch John Roderick Ten - 13 Jul 2026 Form 4 Insider Report for BillionToOne, Inc. (BLLN)

Reporting relationship: SVP of Laboratory Operations
Issuer ticker: BLLN
Reported as of: 13 Jul 2026
Net transaction value: -$533,330
SEC form: 4
Accepted by SEC: 15 Jul 2026, 16:38:24 UTC
Prior SEC filing: 01 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Thomas P. Lynch, Attorney-in-Fact

Key filing fact

Bosch John Roderick Ten filed Form 4 for BillionToOne, Inc. (BLLN) on 15 Jul 2026.

Key facts

This page summarizes Bosch John Roderick Ten's Form 4 filing for BillionToOne, Inc. (BLLN).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 15 Jul 2026, 16:38.

Change

Previous filing in this sequence was filed on 01 Jul 2026.
Current net transaction value: -$533,330.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002087126 Primary reporting owner

ten Bosch John Roderick

Relationship: SVP of Laboratory Operations
Address: C/O BILLIONTOONE, INC., 1035 O'BRIEN DRIVE, MENLO PARK
Signature: /s/ Thomas P. Lynch, Attorney-in-Fact
Signature date: 15 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BLLN transaction

Class A Common Stock

Sale

Transaction value: $177,777
Shares: -1,417
Change %: -4.2%
Price: $125.46
Shares after: 32,135
Date: 13 Jul 2026
Ownership: Direct
Footnotes: F1

BLLN transaction

Class A Common Stock

Sale

Transaction value: $177,777
Shares: -1,417
Change %: -4.4%
Price: $125.46
Shares after: 30,718
Date: 13 Jul 2026
Ownership: Direct
Footnotes: F1

BLLN transaction

Class A Common Stock

Sale

Transaction value: $177,777
Shares: -1,417
Change %: -4.6%
Price: $125.46
Shares after: 29,301
Date: 13 Jul 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 1 footnote

Footnote F1

The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.