Beta Bionics officer plans sale of 4,221 shares

An officer of Beta Bionics filed a Rule 144 notice to sell 4,221 shares mainly to cover taxes from recent RSU vesting.

Rhea-AI Filing Summary

Beta Bionics, Inc. (BBNX) is the issuer for which officer Steven Jon Russell has filed a notice of proposed sale of company stock under Rule 144. The notice covers 4,221 shares of Common Stock to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

The shares relate to Restricted Stock Units vesting under a registered plan as compensation for services to the issuer, and the filer describes the transaction as a sell-to-cover sale to pay taxes on recently vested awards. The filing also lists a prior sale in the past three months of 4,222 shares of Common Stock.

Key Figures

Shares to be sold under Rule 144: 4,221 shares of Common Stock Aggregate value of proposed sale: $81,950.72 Shares sold during past 3 months: 4,222 shares of Common Stock +2 more

5 metrics

Shares to be sold under Rule 144 4,221 shares of Common Stock Proposed sale by officer Steven Jon Russell through Morgan Stanley Smith Barney LLC

Aggregate value of proposed sale $81,950.72 Associated with 4,221 shares of Common Stock to be sold on NASDAQ

Shares sold during past 3 months 4,222 shares of Common Stock Sold on June 2, 2026 by Steven Jon Russell

Aggregate proceeds from prior sale $53,227.18 For 4,222 shares sold on June 2, 2026

Date of notice September 3, 2026 Date the Form 144 notice was signed and filed

Key Terms

Rule 144, Restricted Stock Units, sell-to-cover transaction, compensation for services rendered

4 terms

Rule 144 regulatory

"See the definition of "person" in 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.

Restricted Stock Units financial

"Restricted Stock Units vesting under registered plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

sell-to-cover transaction financial

"This is a sell-to-cover transaction for taxes owed"

A sell-to-cover transaction is when a person granted company stock (for example as part of compensation or option exercise) immediately sells enough of those shares to pay required taxes or exercise costs and keeps the rest. Think of it like cashing part of a bonus to cover the tax bill; it provides necessary cash without the holder needing outside funds. Investors watch these sales because they increase trading volume and slightly reduce insider holdings, but they often reflect routine tax or cost management rather than a judgment on the company’s prospects.

compensation for services rendered financial

"Compensation for services rendered to Issuer"

FAQ

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

What does the Form 144 filing for BBNX disclose about planned share sales?

The filing states that an officer, Steven Jon Russell, may sell 4,221 shares of Beta Bionics Common Stock under Rule 144 through Morgan Stanley Smith Barney LLC on NASDAQ, with the shares tied to recently vested restricted stock units.

Who is selling Beta Bionics (BBNX) shares and in what capacity?

The seller is Steven Jon Russell, identified as an officer of Beta Bionics, Inc. The Form 144 is filed for his account in connection with sales of the company’s Common Stock obtained from restricted stock unit vesting.

How many Beta Bionics (BBNX) shares are covered by the new Form 144 notice?

The notice covers a proposed sale of 4,221 shares of Beta Bionics Common Stock. The transaction is described as a sell-to-cover sale related to tax obligations on recently vested stock unit awards granted by the issuer.

What proceeds are associated with the planned Beta Bionics (BBNX) share sale?

For the proposed sale of 4,221 shares, the filing lists an aggregate value of $81,950.72. This amount is tied to the shares to be sold through Morgan Stanley Smith Barney LLC under Rule 144.

Have there been recent sales of Beta Bionics (BBNX) shares by this officer?

Yes. The Form 144 reports that 4,222 shares of Beta Bionics Common Stock were sold on June 2, 2026 for aggregate proceeds of $53,227.18 during the prior three months.

What is the purpose of the Beta Bionics (BBNX) sell-to-cover transaction?

The remarks state that the transaction is a sell-to-cover sale for taxes owed in connection with recent vesting of stock unit awards granted by Beta Bionics, indicating the sale is tied to tax obligations from equity compensation.

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

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Available on EDGAR 09/03/2026 - 05:24 PM EDT Accepted by SEC EDGAR 09/03/2026 - 05:21 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	0002051384
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	BETA BIONICS, INC.
SEC File Number	001-42491
Address of Issuer	11 HUGHES IRVINE CALIFORNIA 92618
Phone	949-427-7785
Name of Person for Whose Account the Securities are To Be Sold	Steven Jon Russell
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

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
Common Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza New York NY 10004	4221	81950.72	45123368	09/02/2026	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 *
Common Stock	09/01/2026	Restricted Stock Units vesting under registered plan	Issuer			4221	09/01/2026	Compensation for services rendered to Issuer

* 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
Steven Jon Russell c/o Beta Bionics, Inc. 11 Hughes Irvine CA 92618	Common Stock	06/02/2026	4222	53227.18

144: Remarks and Signature

Remarks	This is a sell-to-cover transaction for taxes owed related to recent vesting of stock unit awards granted by the Issuer.
Date of Notice	09/03/2026
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/ Stephen Feider, Attorney-in-Fact
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)