Beta Bionics insider may sell 16,867 shares

Form 144 for Beta Bionics, Inc. reports Rule 144 sales by Sean Saint tied to vested stock unit awards and a prior sale in June 2026.

Rhea-AI Filing Summary

Beta Bionics, Inc. (BBNX) reports that securities beneficially owned for the account of Sean Saint may be sold under Rule 144. The notice covers 16,867 shares of Common Stock, issuable from Restricted Stock Units that vested on September 1, 2026 under a registered plan, with sales to be executed through Morgan Stanley Smith Barney LLC on NASDAQ. The filing states this is a sell-to-cover transaction for taxes owed related to the recent vesting of stock unit awards. During the prior three months, a separate sale of 16,872 shares of Common Stock for $212,706.99 on June 2, 2026 is also reported.

Key Figures

Shares to be sold under Rule 144: 16,867 shares Aggregate market value of securities to be sold: $327,472.81 Shares outstanding class: 45,123,368 shares +4 more

7 metrics

Shares to be sold under Rule 144 16,867 shares Common Stock of Beta Bionics, Inc. for the account of Sean Saint

Aggregate market value of securities to be sold $327,472.81 Common Stock to be sold through Morgan Stanley Smith Barney LLC

Shares outstanding class 45,123,368 shares Class of Beta Bionics, Inc. Common Stock listed in the notice

RSU vesting date September 1, 2026 Restricted Stock Units vesting under registered plan

Prior shares sold in last 3 months 16,872 shares Common Stock sale for the account of Sean Saint on June 2, 2026

Proceeds from prior 3‑month sale $212,706.99 Common Stock sold on June 2, 2026

Date of notice September 3, 2026 Filing date of Rule 144 notice

Key Terms

Rule 144, Restricted Stock Units, sell-to-cover transaction, registered plan, +1 more

5 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 related to recent vesting"

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.

registered plan regulatory

"Restricted Stock Units vesting under registered plan"

A registered plan is a savings or investment account that a government recognizes for special tax treatment and rules, such as limits on how much you can put in and conditions for withdrawals. For investors it matters because those rules change how much of your gains are taxed, how quickly your money can be accessed and what strategies make sense — like a labeled jar that gives tax breaks but comes with rules about when and how you can take the money out.

Compensation for services rendered financial

"Compensation for services rendered to Issuer"

FAQ

What Rule 144 sale is being reported for BBNX in this filing?

The notice covers a potential sale of 16,867 shares of Common Stock of Beta Bionics, Inc. for the account of Sean Saint, arising from Restricted Stock Units that vested on September 1, 2026 under a registered plan, to be sold through Morgan Stanley Smith Barney LLC.

What is the purpose of Sean Saint’s planned stock sale in BBNX?

The filing states the transaction is a sell-to-cover event, intended to cover taxes owed related to the recent vesting of stock unit awards granted by Beta Bionics, Inc., rather than a discretionary sale of existing freely tradable shares.

What prior sales of BBNX stock by Sean Saint are disclosed?

The document reports that on June 2, 2026, 16,872 shares of Beta Bionics, Inc. Common Stock were sold for $212,706.99 for the account of Sean Saint, which is included in the three-month sales history required under Rule 144.

Which broker is handling the Rule 144 sale for BBNX shares?

The planned Rule 144 sale of 16,867 shares of Beta Bionics, Inc. Common Stock is to be handled by Morgan Stanley Smith Barney LLC, located at 1 New York Plaza, New York, New York, with the shares to be sold on NASDAQ.

What is the relationship between the RSUs and the BBNX shares to be sold?

The 16,867 shares of Beta Bionics, Inc. Common Stock covered by this notice arise from Restricted Stock Units vesting under a registered plan on September 1, 2026, with the sale intended as compensation-related and to satisfy associated tax obligations.

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

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Available on EDGAR 09/03/2026 - 05:24 PM Accepted by SEC EDGAR 09/03/2026 - 05:16 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	0002048593
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	Sean Saint
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
Common Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza New York NY 10004	16867	327472.81	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			16867	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
Sean Saint c/o Beta Bionics, Inc. 11 Hughes Irvine CA 92618	Common Stock	06/02/2026	16872	212706.99

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)