BillionToOne officer proposes $298K share sale

Earlier Class A sales listed for John R. Ten Bosch are dated July 13, August 10, August 25, September 9, September 21 and September 24, 2026.

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) lists a proposed sale by Officer John Roderick ten Bosch of 2,834 Class A shares, with an aggregate market value of $297,995.10 and an approximate sale date of October 5, 2026. Fidelity Brokerage Services LLC is named as the broker. The notice also lists six Class A sales by John R. Ten Bosch from July 13 through September 24, 2026.

Key Figures

Proposed Class A sale: 2,834 shares Aggregate market value: $297,995.10 Past Class A sale: 4,251 shares; $533,330.46 +5 more

8 metrics

Proposed Class A sale 2,834 shares Approximate sale date October 5, 2026

Aggregate market value $297,995.10 Proposed Class A sale

Past Class A sale 4,251 shares; $533,330.46 July 13, 2026

Past Class A sale 1,417 shares; $131,582.62 August 10, 2026

Past Class A sale 1,417 shares; $141,700.00 August 25, 2026

Past Class A sale 1,416 shares; $138,116.64 September 9, 2026

Past Class A sale 1,416 shares; $150,959.76 September 21, 2026

Past Class A sale 1,416 shares; $169,920.00 September 24, 2026

Key Terms

Rule 144, Pre IPO shares, attorney-in-fact

3 terms

Rule 144 regulatory

"definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Pre IPO shares financial

"Pre IPO shares"

attorney-in-fact regulatory

"as attorney-in-fact for John R. Ten Bosch"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many BLLN shares did John Roderick ten Bosch propose to sell?

John Roderick ten Bosch's notice lists a proposed sale of 2,834 Class A shares. The notice gives an approximate sale date of October 5, 2026.

What value and sale date are listed for the proposed BLLN sale?

The notice lists an aggregate market value of $297,995.10 and an approximate sale date of October 5, 2026. Fidelity Brokerage Services LLC is listed as the broker.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 01:46 PM Accepted by SEC EDGAR 10/05/2026 - 01:46 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002087126
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	BillionToOne, Inc.
SEC File Number	001-42934
Address of Issuer	1035 O'BRIEN DRIVE MENLO PARK CALIFORNIA 94025
Phone	650-460-2551
Name of Person for Whose Account the Securities are To Be Sold	ten Bosch John Roderick
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	2834	297995.10	42644388	10/05/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A	01/13/2022	Pre IPO shares	Issuer			2834	01/13/2022	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
John R. Ten Bosch 1035 O'Brien Drive Menlo Park, CA 94025	Class A	07/13/2026	4251	533330.46
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/10/2026	1417	131582.62
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/25/2026	1417	141700.00
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/09/2026	1416	138116.64
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/21/2026	1416	150959.76
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/24/2026	1416	169920.00

144: Remarks and Signature

Remarks
Date of Notice	10/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for John R. Ten Bosch
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)