BLLN: Insider sale of 8,000 Class A shares

BLLN reported an insider sale.

Rhea-AI Filing Summary

BLLN reported an insider sale. Shan Sakakibara sold 8,000 Class A shares on 06/08/2026 for $785,800, according to the filing. The filing also lists prior and recent option-related entries showing Class A shares tied to a stock option exercise and pre-IPO holdings.

Insights

Corporate Governance Expert

Routine insider sale of 8,000 Class A shares reported.

The filing shows Shan Sakakibara disposed of 8,000 Class A shares on 06/08/2026 for $785,800. The entry references pre-IPO shares and a stock option exercise as the security provenance.

Cash-flow treatment and any trading plan references are not shown in the excerpt; subsequent filings may disclose further detail about the source of shares or plan status.

Key Figures

Shares sold: 8,000 shares Gross proceeds: $785,800 Reported provenance: Pre-IPO shares; Stock Option Exercise

3 metrics

Shares sold 8,000 shares Class A sold on <date>06/08/2026</date>

Gross proceeds $785,800 Proceeds reported for the 06/08/2026 sale

Reported provenance Pre-IPO shares; Stock Option Exercise Entries dated <date>01/07/2019</date> and <date>06/24/2026</date>

Key Terms

Pre-IPO shares, Stock Option Exercise, Class A

3 terms

Pre-IPO shares market

"Class A | 01/07/2019 | Pre-IPO shares"

Stock Option Exercise financial

"Stock Option Exercise | Issuer | 4000 | 06/24/2026"

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 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 did BLLN insider Shan Sakakibara sell?

Shan Sakakibara sold 8,000 Class A shares. The filing records the transaction date as 06/08/2026 and the gross proceeds as $785,800.

When was the BLLN insider sale executed?

The sale occurred on 06/08/2026. The filing lists that date alongside the 8,000 Class A shares and the reported proceeds of $785,800.

Were the sold shares from option exercises or pre-IPO holdings?

The excerpt lists both Pre-IPO shares and a Stock Option Exercise related to Class A shares. The filing links provenance entries but does not explicitly state which source supplied the sold shares.

How much did the BLLN insider sale raise?

The filing reports gross proceeds of $785,800 from the sale of 8,000 Class A shares on 06/08/2026. The document does not allocate proceeds to any recipient beyond the reported amount.

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

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Accepted by SEC EDGAR 06/24/2026 - 12:50 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	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	880000.00	41442834	06/24/2026	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	06/24/2026	Stock Option Exercise	Issuer			4000	06/24/2026	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

144: Remarks and Signature

Remarks
Date of Notice	06/24/2026
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/ Jennifer Ruchti, 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)