BLLN insider plans sale of 1,417 Class A shares

John R. Ten Bosch filed a notice to sell 1,417 Class A shares of BLLN, held at Fidelity Brokerage Services, with an indicated value of $131,582.62, on NASDAQ by August 10, 2026.

Rhea-AI Filing Summary

John R. Ten Bosch filed a notice to sell 1,417 Class A shares of BLLN, held at Fidelity Brokerage Services, with an indicated value of $131,582.62, on NASDAQ by August 10, 2026. These shares are described as Pre IPO Shares originally received as compensation.

Over the prior three months, Ten Bosch reported Class A sales of 2,832 shares for $287,363.04 on June 15, 2026, 1,416 shares for $169,920.00 on June 29, 2026, and 4,251 shares for $533,330.46 on July 13, 2026.

Key Figures

Planned shares to be sold: 1,417 shares Planned sale value: $131,582.62 Shares sold 06/15/2026: 2,832 shares for $287,363.04 +2 more

5 metrics

Planned shares to be sold 1,417 shares Class A BLLN shares covered by the Form 144 notice

Planned sale value $131,582.62 Value associated with 1,417 Class A shares to be sold

Shares sold 06/15/2026 2,832 shares for $287,363.04 Class A BLLN shares sold by John R. Ten Bosch

Shares sold 06/29/2026 1,416 shares for $169,920.00 Class A BLLN shares sold by John R. Ten Bosch

Shares sold 07/13/2026 4,251 shares for $533,330.46 Class A BLLN shares sold by John R. Ten Bosch

Key Terms

Form 144, Pre IPO Shares, Compensation, Class A

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Pre IPO Shares financial

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

Compensation financial

"12/30/2021 | Pre IPO Shares | Issuer | | | 1417 | 12/30/2021 | Compensation"

Class A financial

"Class A | Fidelity Brokerage Services LLC 900 Salem Street"

Class A denotes a specific group of a company’s shares that carry a particular set of rights—most commonly different voting power or dividend priority compared with other share classes. Think of it like different seats on a bus where some seats let you steer and others only ride: knowing whether a share is Class A tells investors how much influence they have over company decisions and how returns might be distributed, which affects control and value.

FAQ

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

What does BLLN’s Form 144 filing by John R. Ten Bosch disclose?

The filing discloses that John R. Ten Bosch plans to sell 1,417 Class A BLLN shares on NASDAQ, valued at $131,582.62. The shares are identified as Pre IPO Shares originally received as compensation from the issuer.

How many BLLN Class A shares does John R. Ten Bosch plan to sell under this Form 144?

John R. Ten Bosch plans to sell 1,417 Class A BLLN shares. These securities are held at Fidelity Brokerage Services LLC and are targeted for sale on NASDAQ by August 10, 2026, as disclosed in the Form 144.

What prior BLLN share sales are reported for John R. Ten Bosch in the last three months?

The filing lists three recent sales: 2,832 shares for $287,363.04 on June 15, 2026, 1,416 shares for $169,920.00 on June 29, 2026, and 4,251 shares for $533,330.46 on July 13, 2026.

What type of BLLN securities is John R. Ten Bosch selling according to the Form 144?

The securities are Class A BLLN shares described as Pre IPO Shares. The filing notes they were originally issued by the issuer as compensation on December 30, 2021, before BLLN’s public listing.

On which market are the BLLN shares in this Form 144 expected to be sold?

The Form 144 indicates that the Class A BLLN shares are to be sold on NASDAQ. The shares are held at Fidelity Brokerage Services LLC in Smithfield, Rhode Island, as part of the planned sale.

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

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Accepted by SEC EDGAR 08/10/2026 - 03:17 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	131582.62	42644388	08/10/2026	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

144: Remarks and Signature

Remarks
Date of Notice	08/10/2026
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/ Adam Gehring, 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)