Nancy JoAnn Johnson - 16 Jul 2026 Form 4 Insider Report for BillionToOne, Inc. (BLLN)

Reporting relationship: Senior Vice President of Sales and Commercial Operations
Issuer ticker: BLLN
Reported as of: 16 Jul 2026
Net transaction value: -$1,821,628
SEC form: 4
Accepted by SEC: 20 Jul 2026, 19:38:12 UTC
Prior SEC filing: 06 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Thomas P. Lynch, Attorney-in-Fact

Key filing fact

Nancy JoAnn Johnson filed Form 4 for BillionToOne, Inc. (BLLN) on 20 Jul 2026.

Key facts

This page summarizes Nancy JoAnn Johnson's Form 4 filing for BillionToOne, Inc. (BLLN).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 20 Jul 2026, 19:38.

Change

Previous filing in this sequence was filed on 06 Jul 2026.
Current net transaction value: -$1,821,628.

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 0002087387 Primary reporting owner

Johnson Nancy JoAnn

Relationship: Senior Vice President of Sales and Commercial Operations
Address: C/O BILLIONTOONE, INC., 1035 O'BRIEN DRIVE, MENLO PARK
Signature: /s/ Thomas P. Lynch, Attorney-in-Fact
Signature date: 20 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: $270,853
Shares: -2,133
Change %: -10%
Price: $126.98
Shares after: 18,966
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1, F2

BLLN transaction

Class A Common Stock

Sale

Transaction value: $710,918
Shares: -5,559
Change %: -29%
Price: $127.89
Shares after: 13,407
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1, F3

BLLN transaction

Class A Common Stock

Sale

Transaction value: $722,278
Shares: -5,601
Change %: -42%
Price: $128.96
Shares after: 7,806
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1, F4

BLLN transaction

Class A Common Stock

Sale

Transaction value: $117,580
Shares: -906
Change %: -12%
Price: $129.78
Shares after: 6,900
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1, F5

^* 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 5 footnotes

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.

Footnote F2

The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.330 to $127.300 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Footnote F3

The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.445 to $128.430 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Footnote F4

The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $128.475 to $129.340 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Footnote F5

The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $129.580 to $130.010 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC remarks

Senior Vice President of Sales and Commercial Operations