BillionToOne officer plans sale of 1,417 shares

BillionToOne, Inc. (BLLN) is the issuer for a Form 144 notice filed on behalf of officer John R. Ten Bosch.

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) is the issuer for a Form 144 notice filed on behalf of officer John R. Ten Bosch. The notice covers a proposed sale of 1,417 Class A shares to be sold through Fidelity Brokerage Services LLC. It also reports prior open-market sales of Class A shares by John R. Ten Bosch during June–August 2026, including 2,832 shares on June 15, 1,416 shares on June 29, 4,251 shares on July 13, and 1,417 shares on August 10, 2026. The securities described include Class A shares originally acquired on December 30, 2021 as pre-IPO shares received as compensation.

Key Figures

Proposed shares to be sold: 1,417 Class A shares Shares sold June 15, 2026: 2,832 Class A shares Aggregate dollar amount June 15, 2026 sale: $287,363.04 +5 more

8 metrics

Proposed shares to be sold 1,417 Class A shares Shares of BillionToOne, Inc. covered by the Form 144 notice

Shares sold June 15, 2026 2,832 Class A shares Sale by John R. Ten Bosch on 06/15/2026

Aggregate dollar amount June 15, 2026 sale $287,363.04 Consideration for 2,832 Class A shares sold on 06/15/2026

Shares sold June 29, 2026 1,416 Class A shares Sale by John R. Ten Bosch on 06/29/2026

Shares sold July 13, 2026 4,251 Class A shares Sale by John R. Ten Bosch on 07/13/2026

Aggregate dollar amount July 13, 2026 sale $533,330.46 Consideration for 4,251 Class A shares sold on 07/13/2026

Shares sold August 10, 2026 1,417 Class A shares Sale by John R. Ten Bosch on 08/10/2026

Original acquisition date of shares 12/30/2021 Pre IPO Shares received from issuer as compensation

Key Terms

Rule 144, Pre IPO Shares, attorney-in-fact, compensation

4 terms

Rule 144 regulatory

"See the 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

"Class A | 12/30/2021 | Pre IPO Shares | Issuer"

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.

compensation financial

"12/30/2021 | Compensation"

FAQ

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

What does this Form 144 filing mean for BillionToOne, Inc. (BLLN)?

The filing is a notice of a proposed sale of BillionToOne, Inc. Class A shares by officer John R. Ten Bosch under Rule 144. It discloses an intent to sell 1,417 Class A shares and lists related past sales but does not itself execute any transaction.

How many BillionToOne (BLLN) shares are proposed to be sold in this Form 144?

The notice covers a proposed sale of 1,417 Class A shares of BillionToOne, Inc. to be sold through Fidelity Brokerage Services LLC under Rule 144.

What prior BillionToOne (BLLN) share sales by John R. Ten Bosch are disclosed?

The filing lists Class A sales by John R. Ten Bosch of 2,832 shares on June 15, 2026, 1,416 shares on June 29, 2026, 4,251 shares on July 13, 2026, and 1,417 shares on August 10, 2026, each with corresponding dollar amounts.

How were the BillionToOne (BLLN) shares in this Form 144 originally acquired?

The Class A shares to be sold were originally acquired on December 30, 2021 as pre-IPO shares, received from the issuer as compensation, according to the filing.

Who is executing the proposed Rule 144 sale for BillionToOne (BLLN) shares?

The proposed sale of 1,417 Class A shares is to be carried out through Fidelity Brokerage Services LLC. The Form 144 is signed by Jared Cook as a duly authorized representative of Fidelity, acting as attorney-in-fact for John R. Ten Bosch.

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

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Available on EDGAR 08/25/2026 - 04:11 PM EDT Accepted by SEC EDGAR 08/25/2026 - 04:10 PM EDT 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	1417	141700.00	42644388	08/25/2026	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	12/30/2021	Pre IPO Shares	Issuer			1417	12/30/2021	Compensation

* 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	06/15/2026	2832	287363.04
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/29/2026	1416	169920.00
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

144: Remarks and Signature

Remarks
Date of Notice	08/25/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/06/2026
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/ Jared Cook, 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)