BLLN holder plans sale of 10,000 Class A shares

A shareholder of BLLN, identified as David Tsao, has filed a notice of intent to sell 10,000 Class A shares through Fidelity Brokerage Services on NASDAQ, with an indicated value of $928,600.00 as of August 10, 2026.

Rhea-AI Filing Summary

A shareholder of BLLN, identified as David Tsao, has filed a notice of intent to sell 10,000 Class A shares through Fidelity Brokerage Services on NASDAQ, with an indicated value of $928,600.00 as of August 10, 2026.

The filing also reports prior sales of 20,000 Class A shares for $2,045,326.00 on June 15, 2026 and another 20,000 shares for $2,497,698.00 on July 13, 2026. The upcoming sale is associated with a stock option exercise to be settled in cash.

Key Figures

Planned shares to be sold: 10,000 shares Planned sale value: $928,600.00 Shares sold 06/15/2026: 20,000 shares +3 more

6 metrics

Planned shares to be sold 10,000 shares Class A shares indicated for sale as of 08/10/2026

Planned sale value $928,600.00 Indicated value for 10,000 Class A shares as of 08/10/2026

Shares sold 06/15/2026 20,000 shares Class A shares sold on 06/15/2026

Value sold 06/15/2026 $2,045,326.00 Proceeds from 20,000 Class A shares on 06/15/2026

Shares sold 07/13/2026 20,000 shares Class A shares sold on 07/13/2026

Value sold 07/13/2026 $2,497,698.00 Proceeds from 20,000 Class A shares on 07/13/2026

Key Terms

Form 144, Stock Option Exercise, Fidelity Brokerage Services LLC

3 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.

Stock Option Exercise financial

"Class A | 08/10/2026 | 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.

Fidelity Brokerage Services LLC financial

"Class A | Fidelity Brokerage Services LLC 900 Salem Street"

FAQ

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

What share sale is disclosed for BLLN in this Form 144 filing?

The filing discloses a planned sale of 10,000 Class A shares of BLLN, with an indicated value of $928,600.00, to be executed through Fidelity Brokerage Services on NASDAQ on August 10, 2026.

Who is the selling security holder in the BLLN Form 144 notice?

The selling security holder is David Tsao, associated with an address at 1035 OBrien Drive, Menlo Park, CA 94025. He has reported both planned and recent sales of BLLN Class A shares under this notice.

How many BLLN shares has David Tsao sold in the past three months?

Over the past three months, David Tsao reported selling 40,000 Class A shares of BLLN: 20,000 shares for $2,045,326.00 on June 15, 2026 and 20,000 shares for $2,497,698.00 on July 13, 2026.

What transaction type is linked to the planned BLLN share sale?

The planned sale of 10,000 BLLN Class A shares is linked to a Stock Option Exercise, with the transaction described as being settled in cash as of August 10, 2026.

Through which broker and market will the BLLN shares be sold?

The 10,000 BLLN Class A shares are indicated to be sold through Fidelity Brokerage Services LLC, with the shares listed for trading on the NASDAQ market as of August 10, 2026.

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

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Available on EDGAR 08/10/2026 - 11:38 AM Accepted by SEC EDGAR 08/10/2026 - 11:38 AM 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	10000	928600.00	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	Stock Option Exercise	Issuer			10000	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 OBrien Drive Menlo Park CA 94025	Class A	06/15/2026	20000	2045326.00
David Tsao 1035 OBrien Drive Menlo Park CA 94025	Class A	07/13/2026	20000	2497698.00

144: Remarks and Signature

Remarks
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/ Jessica Spraker, 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)