Form 144: Shan Sakakibara proposes sale of 8,000 shares

Rhea-AI Filing Summary

Shan Sakakibara submitted notices on a Form 144 to offer shares of Class A common stock. The filing lists proposed sales of 8,000 shares with gross amounts of $785,800 (dated 06/08/2026) and $880,000 (dated 06/24/2026). The filing also lists Pre-IPO shares of 4,000 (dated 01/07/2019) and a Stock Option Exercise entry of 4,000 shares (dated 07/09/2026). The document shows a numeric line of 41,442,834 and a value $1,000,000.00 in the securities table; those figures appear as ledger entries in the excerpt.

Insights

Securities Compliance Analyst

Form 144 notices record proposed dispositions of Class A shares and related exercise/holdings entries.

The excerpt shows proposed sales of 8,000 shares with associated gross proceeds of $785,800 and $880,000 on 06/08/2026 and 06/24/2026

It also lists 4,000 Pre-IPO shares and a 4,000-share stock option exercise entry. Timing and final settlement details are not provided in the excerpt; subsequent filings would show completion.

Key Figures

Proposed sale (1): 8,000 shares Gross proceeds (1): $785,800 Proposed sale (2): 8,000 shares +5 more

8 metrics

Proposed sale (1) 8,000 shares proposed sale dated 06/08/2026

Gross proceeds (1) $785,800 associated with 8,000-share line dated 06/08/2026

Proposed sale (2) 8,000 shares proposed sale dated 06/24/2026

Gross proceeds (2) $880,000 associated with 8,000-share line dated 06/24/2026

Pre-IPO shares listed 4,000 shares entry dated 01/07/2019 labeled Pre-IPO shares

Stock option exercise 4,000 shares Stock Option Exercise entry dated 07/09/2026

Ledger numeric line 41,442,834 numeric entry appearing in securities table dated 07/09/2026

Table value $1,000,000.00 value appearing in securities table row

Key Terms

Form 144, Pre-IPO shares, Stock Option Exercise, 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 | 01/07/2019 | Pre-IPO shares"

Stock Option Exercise financial

"Stock Option Exercise | Issuer | 4000 | 07/09/2026"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Class A market

"Class A | Fidelity Brokerage Services LLC"

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

What does Shan Sakakibara's Form 144 for BLLN report?

The filing reports proposed sales of 8,000 Class A shares on two dates. The excerpt lists gross proceeds of $785,800 (06/08/2026) and $880,000 (06/24/2026) and includes entries for 4,000 pre-IPO shares and a 4,000-share option exercise.

How many shares and proceeds are disclosed on the BLLN Form 144?

The excerpt discloses proposed dispositions of 8,000 shares twice with proceeds of $785,800 and $880,000. It also lists 4,000 Pre-IPO shares and a 4,000-share stock option exercise in the securities section.

Does the Form 144 show when the option exercise occurred for BLLN?

Yes. The excerpt shows a Stock Option Exercise entry for 4,000 shares dated 07/09/2026. The filing lists that exercise alongside the other securities entries in the same table.

Are outstanding share totals or ledger figures shown in the excerpt?

The excerpt includes numeric lines including 41,442,834 and $1,000,000.00 within the securities table. These figures appear as ledger entries in the provided content but the excerpt does not label them further.

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

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Available on EDGAR 07/09/2026 - 12:59 PM Accepted by SEC EDGAR 07/09/2026 - 12:59 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	0002088547
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	Sakakibara Shan Riku
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	8000	1000000.00	41442834	07/09/2026	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	01/07/2019	Pre-IPO shares	Issuer			4000	01/07/2019	Cash
Class A	07/09/2026	Stock Option Exercise	Issuer			4000	07/09/2026	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
Shan Sakakibara 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/08/2026	8000	785800.00
Shan Sakakibara 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/24/2026	8000	880000.00

144: Remarks and Signature

Remarks
Date of Notice	07/09/2026
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/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Shan Sakakibara
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)