BillionToOne officer’s spouse proposes $315K share sale

The account identified for the sale is Ezgi N. Akcinar Atay’s; she is the spouse of officer and director Oguzhan Atay.

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) has a Form 144 notice listing 2,667 Class A shares to be sold through Fidelity Brokerage Services LLC, at an aggregate market value of $314,706 and an approximate sale date of October 28, 2026. The remarks identify the account for the sale as Ezgi N. Akcinar Atay’s; she is the spouse of Oguzhan Atay, an officer and director. The past-three-month table includes sales recorded under Oguzhan Atay, Ezgi N. Akcinar Atay, and Atay 2021 Dynasty Trust; trust sales were made by Icontrust LLC, trustee.

Key Figures

Shares listed for sale: 2,667 Class A shares Aggregate market value: $314,706 Past-three-month sale: 32,500 Class A shares +3 more

6 metrics

Shares listed for sale 2,667 Class A shares Approximate sale date October 28, 2026

Aggregate market value $314,706 Shares listed for sale

Past-three-month sale 32,500 Class A shares Oguzhan Atay, August 3, 2026

Past-three-month sale value $4,450,834.75 Oguzhan Atay, August 3, 2026

Past-three-month sale 12,500 Class A shares Ezgi N. Akcinar Atay, August 3, 2026

Past-three-month sale value $1,717,125.00 Ezgi N. Akcinar Atay, August 3, 2026

Key Terms

Rule 144, Pre-IPO Shares, attorney-in-fact

3 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Pre-IPO Shares financial

"Pre-IPO Shares | Issuer"

attorney-in-fact regulatory

"as attorney-in-fact for Ezgi N. Akcinar Atay"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

How many BLLN Class A shares are listed for sale?

The notice lists 2,667 Class A shares, with an aggregate market value of $314,706, for sale through Fidelity Brokerage Services LLC on the approximate sale date of October 28, 2026.

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

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Available on EDGAR 10/28/2026 - 12:02 PM EDT Accepted by SEC EDGAR 10/28/2026 - 12:02 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	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	2667	314706.00	42644388	10/28/2026	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			2667	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	08/03/2026	32500	4450834.75
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/03/2026	12500	1717125.00
Atay 2021 Dynasty Trust 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/03/2026	2500	343425.00
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	08/05/2026	15539	2331351.91
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/14/2026	24999	2507908.84
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/14/2026	5332	522536.00
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/28/2026	8333	1005293.12
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	09/28/2026	2666	321626.24
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	10/12/2026	16667	1563124.60
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	10/12/2026	2667	260325.87
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	10/14/2026	3183	313019.72
Ezgi N. Akcinar Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	10/14/2026	2667	261366.00
Oguzhan Atay 1035 O'Brien Drive Menlo Park CA 94025	Class A	10/15/2026	5150	516188.60

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	10/28/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/07/2026
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/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Ezgi N. Akcinar Atay
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)