BLLN holder plans sale of 20,000 Class A shares

Rhea-AI Filing Summary

BLLN has a Form 144 notice for the planned sale of up to 20,000 Class A shares through Fidelity Brokerage Services LLC, tied to a stock option exercise, with a proposed aggregate value of $250,497.77 and an intended sale date of July 13, 2026 on NASDAQ. The filing also lists sales in the prior three months, including 20,000 Class A shares by David Tsao for $2,045,326.00 and 3,500 Class A shares by the Dt 2021 Irrevocable Trust for $355,145.00 on June 15, 2026.

Filing Explained

The July 13 filing lists 20,000 Class A shares for sale; it does not establish that sale or the option exercise occurred.

The July 13 Form 144 lists 20,000 Class A shares for sale by Fidelity Brokerage Services LLC at an aggregate stated value of $250497.77.

It identifies the transaction as a “Stock Option Exercise” with the issuer and cash as the consideration, but does not state that the option exercise or sale has been completed.

The disclosed consequence is limited to a planned sale transaction; the filing does not establish proceeds received or a completed change in common shares outstanding.

The filing also records June 15 sales of 20,000 Class A shares for $2,045,326.00 by David Tsao’s 2021 Irrevocable Trust and 3,500 Class A shares for $355,145.00 by Dt 2021 Irrevocable Trust.

Those June 15 entries are reported as past-three-month sales, separate from the 20,000 shares listed for sale on July 13.

The relevant milestone is completion of the July 13 sale and option exercise; neither is reported in this filing.

Key Figures

Shares to be sold: 20,000 shares Proposed aggregate value: $250,497.77 Prior sale by David Tsao: 20,000 shares +3 more

6 metrics

Shares to be sold 20,000 shares Planned sale of Class A through Fidelity Brokerage Services LLC on 07/13/2026

Proposed aggregate value $250,497.77 Planned NASDAQ sale of 20,000 Class A shares on 07/13/2026

Prior sale by David Tsao 20,000 shares Class A shares sold on 06/15/2026

Proceeds to David Tsao $2,045,326.00 Consideration for 20,000 Class A shares sold on 06/15/2026

Prior sale by Dt 2021 Irrevocable Trust 3,500 shares Class A shares sold on 06/15/2026

Proceeds to Dt 2021 Irrevocable Trust $355,145.00 Consideration for 3,500 Class A shares sold on 06/15/2026

Key Terms

Form 144, Stock Option Exercise, Irrevocable Trust

3 terms

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.

Stock Option Exercise financial

"Class A | 07/13/2026 | 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.

Irrevocable Trust financial

"Dt 2021 Irrevocable Trust 1035 OBrien 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.

FAQ

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

The Form 144 notice for BLLN covers a planned sale of up to 20,000 Class A shares through Fidelity Brokerage Services LLC, related to a stock option exercise, with a proposed aggregate value of $250,497.77 on NASDAQ.

When is the planned BLLN Class A share sale expected to occur?

The planned sale of 20,000 BLLN Class A shares is listed with an intended sale date of July 13, 2026. The securities are to be sold for cash on NASDAQ through Fidelity Brokerage Services LLC.

What recent BLLN share sales by David Tsao are reported?

The filing reports that David Tsao sold 20,000 Class A shares of BLLN on June 15, 2026 for total proceeds of $2,045,326.00, disclosed under the section for securities sold during the past three months.

What BLLN share sales are disclosed for the Dt 2021 Irrevocable Trust?

The Dt 2021 Irrevocable Trust is reported to have sold 3,500 Class A shares of BLLN on June 15, 2026, with total proceeds of $355,145.00, as part of the three-month securities sales disclosure.

On which exchange will the BLLN shares be sold under this Form 144?

The planned sale of 20,000 BLLN Class A shares is identified for trading on NASDAQ, with Fidelity Brokerage Services LLC acting as the broker and cash as the form of payment.

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

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Available on EDGAR 07/13/2026 - 04:13 PM Accepted by SEC EDGAR 07/13/2026 - 04:13 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	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	20000	250497.77	41442834	07/13/2026	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	07/13/2026	Stock Option Exercise	Issuer			20000	07/13/2026	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
Dt 2021 Irrevocable Trust 1035 OBrien Drive Menlo Park CA 94025	Class A	06/15/2026	3500	355145.00

144: Remarks and Signature

Remarks	Sales within the past 3 months occurred in the account of the Dt 2021 Irrevocable Trust by Icontrust Llc, trustee on the account.
Date of Notice	07/13/2026
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/ Gary Redman, 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)