Beta Bionics insider files to sell 4,378 shares

Beta Bionics reported a Form 144 notice by Michael Mensinger proposing the sale of 4,378 shares of Common Stock.

Rhea-AI Filing Summary

Beta Bionics reported a Form 144 notice by Michael Mensinger proposing the sale of 4,378 shares of Common Stock. The filing shows the securities relate to Restricted Stock Units vesting under a registered plan with a vesting date of 06/01/2026. The cover line lists a value of $55,994.62 and a reference share count of 44,561,695.

Insights

Corporate Governance Analyst

Routine Form 144 filing for vested RSUs by an insider.

The filing lists a proposed sale of 4,378 shares tied to Restricted Stock Units vesting under a registered plan on 06/01/2026. The notice includes a gross dollar figure of $55,994.62 on the cover line.

These notices are administrative disclosures required for certain insider sales. Subsequent Form 4 or broker reports would show executed trades; timing and cash‑flow treatment are not provided in the excerpt.

Key Figures

Proposed shares to sell: 4,378 shares Cover line value: $55,994.62 Shares outstanding (row): 44,561,695 +3 more

6 metrics

Proposed shares to sell 4,378 shares listed on Form 144 cover row

Cover line value $55,994.62 cover row associated with the 4,378-share entry

Shares outstanding (row) 44,561,695 listed on the same cover row with date <date>06/02/2026</date>

Prior sale in past 3 months 1,064 shares sold on <date>03/02/2026</date> by Michael Mensinger

Value of prior sale $13,152.74 amount shown for the 1,064-share sale on 03/02/2026

Vesting date 06/01/2026 Restricted Stock Units vesting under registered plan

Key Terms

Form 144, Restricted Stock Units, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"Form 144 notice row listing proposed sale and broker details"

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.

Restricted Stock Units financial

""Restricted Stock Units vesting under registered plan" entry"

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.

Securities Sold During The Past 3 Months regulatory

"Section showing a 1,064-share sale on 03/02/2026"

FAQ

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

How many shares does the Form 144 for BBNX propose to sell?

The Form 144 lists a proposed sale of 4,378 shares. This quantity is tied to restricted stock units that vest under a registered plan on 06/01/2026, as shown in the filing.

Who is the filing person on the BBNX Form 144?

The filing names Michael Mensinger as the reporting person, c/o Beta Bionics, Inc. The notice is submitted under his name in relation to vested restricted stock units.

What dollar value is shown for the proposed sale in the filing?

The cover line shows a value of $55,994.62. That amount appears on the same row that lists 4,378 shares and the 06/02/2026 entry.

Were there recent sales by the same person before this Form 144?

Yes: the filing records a prior sale of 1,064 shares on 03/02/2026 with a value of $13,152.74, listed under "Securities Sold During The Past 3 Months."

What type of securities are being sold under this Form 144?

The filing indicates the securities are Common Stock issued on vesting of Restricted Stock Units under a registered compensation plan, with the vesting date shown as 06/01/2026.

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

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Accepted by SEC EDGAR 06/03/2026 - 05:43 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	0002048500
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	Michael R. Mensinger
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	4378	55994.62	44561695	06/02/2026	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	06/01/2026	Restricted Stock Units vesting under registered plan	Issuer			4378	06/01/2026	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
Michael Mensinger c/o Beta Bionics, Inc. 11 Hughes Irvine CA 92618	Common Stock	03/02/2026	1064	13152.74

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	06/03/2026
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)