BLLN insider files Form 144 to sell 2,832 shares

BLLN insider sale notice filed under Rule 144.

Rhea-AI Filing Summary

BLLN insider sale notice filed under Rule 144. The filing lists a proposed or reported sale of 2,832 Class A shares by John R. Ten Bosch with a transaction date of 06/15/2026 and proceeds shown as $287,363.04. The shares are labeled Pre IPO Shares with an original date of 12/31/2021.

Insights

Corporate Governance Analyst

Routine insider resale under Rule 144; limited market signal.

The filed items show a disclosure of 2,832 Class A shares associated with John R. Ten Bosch, dated 06/15/2026. The filing appears administrative: it notifies the market of an intended or effected resale rather than announcing corporate change.

Cash proceeds are listed as $287,363.04. Timing, selling method, and remaining holdings are not detailed in the excerpt, so economic impact depends on additional disclosures or market activity.

Key Figures

Shares sold: 2,832 shares Proceeds: $287,363.04 Security class: Class A +2 more

5 metrics

Shares sold 2,832 shares transaction date 06/15/2026

Proceeds $287,363.04 amount shown alongside the 06/15/2026 sale

Security class Class A listed security type for the sale

Share classification date 12/31/2021 labeled as Pre IPO Shares

Broker Fidelity Brokerage Services LLC broker listed with address 900 Salem Street, Smithfield RI

Key Terms

Form 144, Pre IPO Shares, Class A

3 terms

Form 144 regulatory

"Filed notice of proposed sale under Rule 144 (Form 144) listing transaction details"

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

"Security entry labeled as Pre IPO Shares dated 12/31/2021"

Class A financial

"Security class listed as Class A in the securities information"

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 did the BLLN Form 144 disclose about the sale?

The Form 144 discloses a sale of 2,832 Class A shares by John R. Ten Bosch on 06/15/2026. The filing lists proceeds of $287,363.04 and labels the stock as Pre IPO Shares dated 12/31/2021.

Does the Form 144 show how the shares will be sold for BLLN?

The filing does not specify the method of sale in this excerpt. It lists broker information for Fidelity Brokerage Services LLC, but the exact distribution method is not provided here.

Who is the reporting person on the BLLN Form 144?

The reporting person named is John R. Ten Bosch, with an address in Menlo Park, CA. The Form 144 entry links him to the 2,832 Class A shares transaction dated 06/15/2026.

Are these newly issued shares or pre-IPO shares for BLLN?

The shares are labeled as Pre IPO Shares with a date of 12/31/2021. The excerpt ties the holdings to that pre-IPO classification rather than newly issued shares.

Do the Form 144 details indicate remaining holdings after the sale?

The excerpt does not provide a post-transaction holdings total. The filing shows the sale quantity and proceeds but does not state shares outstanding or remaining holdings for the reporting person.

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

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Accepted by SEC EDGAR 06/29/2026 - 11:20 AM 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	1416	169920.00	41442834	06/29/2026	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	12/31/2021	Pre IPO Shares	Issuer			1416	12/31/2021	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 OBrien Drive Menlo Park CA 94025	Class A	06/15/2026	2832	287363.04

144: Remarks and Signature

Remarks
Date of Notice	06/29/2026
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/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)