BLLN insider plans sale of 3,500 Class A shares

BLLN has a notice of proposed sale of restricted securities.

Rhea-AI Filing Summary

BLLN has a notice of proposed sale of restricted securities. An affiliated holder plans to sell 3,500 Class A shares on or after August 10, 2026 through Fidelity Brokerage Services LLC on NASDAQ. The disclosure also lists prior Class A share sales by David Tsao and the Dt 2021 Irrevocable Trust in June and July 2026, including multiple transactions of 20,000 and 3,500 shares with multi-hundred-thousand-dollar proceeds.

Key Figures

Planned shares to be sold: 3,500 shares Planned sale value: $325,010.00 Sale on June 15, 2026 (David Tsao): 20,000 shares; $2,045,326.00 +3 more

6 metrics

Planned shares to be sold 3,500 shares Class A pre-IPO shares proposed for sale on or after August 10, 2026

Planned sale value $325,010.00 Aggregate value for 3,500 Class A shares in the new planned sale

Sale on June 15, 2026 (David Tsao) 20,000 shares; $2,045,326.00 Class A shares sold by David Tsao on June 15, 2026

Sale on June 15, 2026 (Trust) 3,500 shares; $355,145.00 Class A shares sold by Dt 2021 Irrevocable Trust

Sale on July 13, 2026 (David Tsao) 20,000 shares; $2,497,697.77 Class A shares sold by David Tsao on July 13, 2026

Sale on July 13, 2026 (Trust) 3,500 shares; $439,110.00 Class A shares sold by Dt 2021 Irrevocable Trust

Key Terms

pre-IPO Shares, Form 144, irrevocable trust, Fidelity Brokerage Services LLC

4 terms

pre-IPO Shares financial

"Class A | 08/10/2026 | Pre-IPO Shares | Issuer"

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.

irrevocable trust financial

"Dt 2021 Irrevocable Trust 1035 O'Brien Drive Menlo Park CA 94025"

An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.

Fidelity Brokerage Services LLC financial

"Class A | Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917"

FAQ

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

What stock sale is being planned for BLLN under this Form 144?

An affiliated holder of BLLN plans to sell 3,500 Class A shares on or after August 10, 2026. The planned sale is to be executed through Fidelity Brokerage Services LLC on NASDAQ.

What is the estimated value of the new BLLN Class A shares to be sold?

The proposed sale covers 3,500 Class A shares with an aggregate value of $325,010.00. This reflects the filer’s estimate for the upcoming transaction disclosed in the notice.

Which broker is handling the planned BLLN share sale?

The planned sale of 3,500 BLLN Class A shares will be handled by Fidelity Brokerage Services LLC. The broker’s address is listed as 900 Salem Street, Smithfield, RI 02917, and trades are indicated for NASDAQ.

What recent BLLN share sales has David Tsao reported?

David Tsao reported selling 20,000 Class A shares on June 15, 2026 for $2,045,326.00, and another 20,000 shares on July 13, 2026 for $2,497,697.77. Both dates also show related trust sales.

What BLLN sales were made by the Dt 2021 Irrevocable Trust?

The Dt 2021 Irrevocable Trust sold 3,500 Class A shares on June 15, 2026 for $355,145.00, and another 3,500 shares on July 13, 2026 for $439,110.00, according to the disclosure of past three-month sales.

Are the BLLN shares in this Form 144 described as pre-IPO shares?

Yes. The filing describes the 3,500 Class A shares to be sold on or after August 10, 2026 as Pre-IPO Shares being sold for cash by the issuer-affiliated holder.

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

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Accepted by SEC EDGAR 08/10/2026 - 03:11 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	0002087127
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	Tsao David
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	3500	325010.00	42644388	08/10/2026	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	08/10/2026	Pre-IPO Shares	Issuer			3500	08/10/2026	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
David Tsao 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/15/2026	20000	2045326.00
Dt 2021 Irrevocable Trust 1035 O'Brien Drive Menlo Park CA 94025	Class A	06/15/2026	3500	355145.00
David Tsao 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/13/2026	20000	2497697.77
Dt 2021 Irrevocable Trust 1035 O'Brien Drive Menlo Park CA 94025	Class A	07/13/2026	3500	439110.00

144: Remarks and Signature

Remarks	Today's sale and sales within the past 3 months occurred in the account of the Dt 2021 Irrevocable Trust by Icontrust Llc, trustee on the account. David Tsao is an account stakeholder in the Dt 2021 Irrevocable Trust.
Date of Notice	08/10/2026
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/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David Tsao
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)