BLLN holder plans Class A stock sale

BLLN has a notice to sell up to 32,500 Class A shares, to be sold through Fidelity Brokerage Services LLC on NASDAQ on August 3, 2026, in connection with a stock option exercise.

Rhea-AI Filing Summary

BLLN has a notice to sell up to 32,500 Class A shares, to be sold through Fidelity Brokerage Services LLC on NASDAQ on August 3, 2026, in connection with a stock option exercise. The proposed sale amount is listed at an aggregate value of $4,488,575.00.

The filing also lists Class A share sales during the prior three months by Oguzhan Atay, Ezgi N. Akcinar Atay, and the Atay 2021 Dynasty Trust. These include 26,250 shares on June 8, 2026 for $2,563,632.00, 26,250 shares on July 6, 2026 for $3,203,733.13, and 12,500 shares on July 9, 2026 for $1,576,276.25, along with additional transactions by related holders.

Key Figures

Proposed shares to be sold: 32,500 shares Aggregate value of proposed sale: $4,488,575.00 Sale June 8, 2026 - Oguzhan Atay: 26,250 shares for $2,563,632.00 +4 more

7 metrics

Proposed shares to be sold 32,500 shares Class A shares proposed for sale on August 3, 2026

Aggregate value of proposed sale $4,488,575.00 Value associated with 32,500 Class A shares

Sale June 8, 2026 - Oguzhan Atay 26,250 shares for $2,563,632.00 Class A share transaction on June 8, 2026

Sale July 6, 2026 - Oguzhan Atay 26,250 shares for $3,203,733.13 Class A share transaction on July 6, 2026

Sale July 9, 2026 - Oguzhan Atay 12,500 shares for $1,576,276.25 Class A share transaction on July 9, 2026

Sale June 8, 2026 - Ezgi N. Akcinar Atay 12,500 shares for $1,227,812.50 Class A share transaction on June 8, 2026

Sale June 8, 2026 - Atay 2021 Dynasty Trust 2,500 shares for $245,562.50 Class A share transaction on June 8, 2026

Key Terms

Form 144, Class A, Stock Option Exercise, brokerage services

4 terms

Form 144 regulatory

"Filer Information | | | 144: Filer Information"

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.

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.

Stock Option Exercise financial

"Class A | 08/03/2026 | Stock Option Exercise | Issuer"

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.

brokerage services financial

"Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917"

Brokerage services are firms or online platforms that act as the bridge between individual or institutional investors and financial markets, handling the buying, selling and safekeeping of stocks, bonds and other securities. They also provide tools like trading platforms, market research, account administration and optional credit for trading on margin; these features and fees directly affect an investor’s costs, access to opportunities and the speed and reliability of executing trades—like choosing the right driver and route for an important trip.

FAQ

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

What does the BLLN Form 144 filing disclose about upcoming stock sales?

The Form 144 for BLLN discloses a proposed sale of up to 32,500 Class A shares on August 3, 2026, tied to a stock option exercise and routed through Fidelity Brokerage Services LLC on NASDAQ.

How many BLLN Class A shares are proposed to be sold under this Form 144?

The filing lists a proposed sale of 32,500 Class A shares. These shares are associated with a stock option exercise and are expected to be sold on August 3, 2026 through Fidelity Brokerage Services LLC on NASDAQ.

What aggregate value is reported for the proposed BLLN share sale?

The proposed BLLN share sale is shown with an aggregate value of $4,488,575.00. This amount relates to the planned sale of 32,500 Class A shares in connection with a stock option exercise scheduled for August 3, 2026.

Which past BLLN stock sales are disclosed in the last three months?

Disclosed past sales include Oguzhan Atay selling 26,250 shares on June 8, 2026 for $2,563,632.00 and 26,250 shares on July 6, 2026 for $3,203,733.13, plus additional Class A share sales by Ezgi N. Akcinar Atay and the Atay 2021 Dynasty Trust.

Who are the selling security holders named in the BLLN Form 144?

Named holders include Oguzhan Atay, Ezgi N. Akcinar Atay, and the Atay 2021 Dynasty Trust. Their transactions involve multiple BLLN Class A share sales on June 8, 2026 and July 6, 2026, plus a further sale by Oguzhan Atay on July 9, 2026.

On which market and through which broker will the BLLN shares be sold?

The proposed BLLN Class A share sale is listed for the NASDAQ market, with Fidelity Brokerage Services LLC as the broker. The Form 144 ties this to a stock option exercise with an anticipated sale date of August 3, 2026.

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

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Available on EDGAR 08/03/2026 - 12:01 PM Accepted by SEC EDGAR 08/03/2026 - 12:01 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	0002088549
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	Atay Oguzhan
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
Relationship to Issuer	Director

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	32500	4488575.00	41442834	08/03/2026	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	08/03/2026	Stock Option Exercise	Issuer			32500	08/03/2026	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
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/08/2026	26250	2563632.00
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/08/2026	12500	1227812.50
Atay 2021 Dynasty Trust 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/08/2026	2500	245562.50
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/06/2026	26250	3203733.13
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/06/2026	12500	1525645.67
Atay 2021 Dynasty Trust 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/06/2026	2500	300000.00
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/09/2026	12500	1576276.25

144: Remarks and Signature

Remarks	There are sales within the past 3 months occurred in the account of Ezgi N. Akcinar Atay, who is the spouse of Oguzhan Atay. Additionally, there are sales within the past 3 months which occurred in the Atay 2021 Dynasty Trust which were made by Icontrust Llc, trustee on the account. Oguzhan Atay is an account stakeholder in the Atay 2021 Dynasty Trust.
Date of Notice	08/03/2026
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 Oguzhan Atay
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)