BLLN issuer plans sale of Class A shares

The BLLN issuer filed to potentially sell 12,500 Class A shares, to be executed through Fidelity Brokerage Services LLC, with an aggregate value of $1,717,125.00 and a noted date of August 3, 2026.

Rhea-AI Filing Summary

The BLLN issuer filed to potentially sell 12,500 Class A shares, to be executed through Fidelity Brokerage Services LLC, with an aggregate value of $1,717,125.00 and a noted date of August 3, 2026. These are described as Pre-IPO Shares to be sold for cash.

The filing also lists Class A share sales during the prior three months by related holders Oguzhan Atay, Ezgi N. Akcinar Atay, and the Atay 2021 Dynasty Trust on June 8, 2026, July 6, 2026, and July 9, 2026, with individual transaction sizes ranging from 2,500 to 26,250 shares and corresponding aggregate sale prices disclosed for each trade.

Key Figures

Proposed shares to be sold: 12,500 shares Proposed aggregate sale value: $1,717,125.00 Shares sold by Oguzhan Atay 06/08/2026: 26,250 shares +5 more

8 metrics

Proposed shares to be sold 12,500 shares Class A Pre-IPO Shares proposed for sale for cash

Proposed aggregate sale value $1,717,125.00 Aggregate value for 12,500 Class A shares through Fidelity Brokerage Services LLC

Shares sold by Oguzhan Atay 06/08/2026 26,250 shares Class A shares sold on June 8, 2026 for $2,563,632.00

Shares sold by Oguzhan Atay 07/06/2026 26,250 shares Class A shares sold on July 6, 2026 for $3,203,733.13

Shares sold by Oguzhan Atay 07/09/2026 12,500 shares Class A shares sold on July 9, 2026 for $1,576,276.25

Shares sold by Ezgi N. Akcinar Atay 06/08/2026 12,500 shares Class A shares sold on June 8, 2026 for $1,227,812.50

Shares sold by Ezgi N. Akcinar Atay 07/06/2026 12,500 shares Class A shares sold on July 6, 2026 for $1,525,645.67

Shares sold by Atay 2021 Dynasty Trust 07/06/2026 2,500 shares Class A shares sold on July 6, 2026 for $300,000.00

Key Terms

Pre-IPO Shares, Securities To Be Sold, Securities Sold During The Past 3 Months, Dynasty Trust

4 terms

Pre-IPO Shares financial

"Class A | 05/01/2024 | Pre-IPO Shares | Issuer"

Securities To Be Sold regulatory

"144: Securities To Be Sold Class A | 05/01/2024"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

Dynasty Trust financial

"Atay 2021 Dynasty Trust 1035 O'Brien Drive Menlo Park CA 94025"

FAQ

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

What amount of BLLN Class A stock is covered by this Form 144 filing?

The filing covers a proposed sale of 12,500 Class A shares of the BLLN issuer, with an aggregate value of $1,717,125.00, to be transacted through Fidelity Brokerage Services LLC for cash.

What type of BLLN securities are proposed for sale under this Form 144?

The proposed sale involves Class A Pre-IPO Shares of the BLLN issuer. The filing indicates these shares are to be sold for cash, with a planned broker, share count, and aggregate value specified.

Which BLLN-related holders sold Class A shares in the past three months?

Reported sellers include Oguzhan Atay, Ezgi N. Akcinar Atay, and the Atay 2021 Dynasty Trust, each disposing of BLLN Class A shares on June 8, 2026, July 6, 2026, and July 9, 2026, with aggregate sale prices listed.

How many BLLN Class A shares did Oguzhan Atay sell according to this Form 144?

Oguzhan Atay is reported selling 26,250 Class A shares on June 8, 2026 for $2,563,632.00 and another 26,250 shares on July 6, 2026 for $3,203,733.13, plus 12,500 shares on July 9, 2026 for $1,576,276.25.

What BLLN Class A share sales are reported for Ezgi N. Akcinar Atay?

Ezgi N. Akcinar Atay is shown selling 12,500 Class A shares on June 8, 2026 for $1,227,812.50 and another 12,500 shares on July 6, 2026 for $1,525,645.67, with both transactions involving BLLN Class A stock.

What transactions involving the Atay 2021 Dynasty Trust appear in the BLLN Form 144?

The Atay 2021 Dynasty Trust is reported selling 2,500 Class A shares on June 8, 2026 for $245,562.50 and another 2,500 shares on July 6, 2026 for $300,000.00, both in BLLN Class A stock.

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

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Available on EDGAR 08/03/2026 - 12:25 PM Accepted by SEC EDGAR 08/03/2026 - 12:25 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	Member of immediate family of any of the foregoing

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	12500	1717125.00	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	05/01/2024	Pre-IPO Shares	Issuer			12500	05/01/2024	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	Today's sale and sales within the past 3 months occurred in the account of Ezgi N. Akcinar Atay, who is the spouse of Oguzhan Atay, an Officer and Director of the company. There are also 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	03/07/2026
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)