BillionToOne holder plans $138K stock sale

BillionToOne, Inc. (BLLN) received a notice that stockholder John R. Ten Bosch intends to sell 1,416 shares of Class A common stock of BillionToOne, Inc. under Rule 144.

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) received a notice that stockholder John R. Ten Bosch intends to sell 1,416 shares of Class A common stock of BillionToOne, Inc. under Rule 144. The shares were acquired on January 13, 2022 as pre-IPO shares from the issuer for cash.

The planned sale will be executed through Fidelity Brokerage Services LLC, and the filing lists an aggregate market value reference of $138,116.64 for the 1,416 shares as of September 9, 2026, with the Class A common stock listed on NASDAQ. The notice also reports several prior Class A sales by Ten Bosch during the preceding three months.

Key Figures

Shares proposed to be sold: 1,416 shares Aggregate market value of shares proposed: $138,116.64 Pre-IPO acquisition date: January 13, 2022 +4 more

7 metrics

Shares proposed to be sold 1,416 shares Class A common stock under Rule 144 notice by John R. Ten Bosch

Aggregate market value of shares proposed $138,116.64 Value for 1,416 Class A shares as of September 9, 2026

Pre-IPO acquisition date January 13, 2022 Date the 1,416 pre-IPO shares were acquired from the issuer for cash

Shares sold June 15, 2026 2,832 shares Class A shares sold by John R. Ten Bosch for $287,363.04

Proceeds June 15, 2026 sale $287,363.04 Aggregate consideration for 2,832 Class A shares

Shares sold June 29, 2026 1,416 shares Class A shares sold by John R. Ten Bosch for $169,920.00

Proceeds June 29, 2026 sale $169,920.00 Aggregate consideration for 1,416 Class A shares

Key Terms

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

3 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 | 01/13/2022 | 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.

FAQ

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

The notice states that John R. Ten Bosch intends to sell 1,416 Class A shares of BillionToOne, Inc. under Rule 144. It is a disclosure of a planned sale by a stockholder, not an issuance of new shares by the company.

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

The filing reports an intended sale of 1,416 shares of BillionToOne, Inc. Class A common stock. These shares were originally acquired on January 13, 2022 as pre-IPO shares from the issuer for cash.

What is the reference market value of the BillionToOne (BLLN) shares in this Form 144?

For the 1,416 Class A shares covered by the notice, the filing lists an aggregate market value of $138,116.64 as of September 9, 2026. This figure reflects the value used in the Rule 144 disclosure.

Which broker is handling the proposed sale of BillionToOne (BLLN) shares?

The proposed sale of the 1,416 Class A shares is to be handled through Fidelity Brokerage Services LLC, located in Smithfield, Rhode Island, as stated in the Rule 144 notice.

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

The notice lists recent Class A sales by John R. Ten Bosch, including 2,832 shares on June 15, 2026 for $287,363.04 and 1,416 shares on June 29, 2026 for $169,920.00, along with additional sales in July and August 2026.

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

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Available on EDGAR 09/09/2026 - 11:32 AM Accepted by SEC EDGAR 09/09/2026 - 11:31 AM 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	1416	138116.64	42644388	09/09/2026	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			1416	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	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
John R. Ten Bosch 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/25/2026	1417	141700.00

144: Remarks and Signature

Remarks
Date of Notice	09/09/2026
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/ Jessica Spraker, 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)