MBX (NASDAQ: MBX) insider plans sale of 30,864 common shares

Rhea-AI Filing Summary

MBX filed a Form 144 notice of proposed sale of restricted stock. The filing covers the planned sale of 30,864 shares of common stock through Fidelity Brokerage Services LLC, with an aggregate market value of $1,102,991.13, to be sold on or about 01/12/2026 on the NASDAQ market. The filing notes that 44,902,302 shares of common stock were outstanding.

The shares to be sold were recently acquired by exercising stock options granted on 09/12/2024, 01/31/2024, and 09/01/2020. On 01/12/2026, the filer acquired 4,323, 9,905, and 16,636 common shares, respectively, paying cash upon exercise. By signing the notice, the seller represents they are not aware of any undisclosed material adverse information about the issuer’s current or prospective operations.

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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	30864	1102991.13	44902302	01/12/2026	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	01/12/2026	Option Granted - 09/12/2024	Issuer			4323	01/12/2026	Cash
Common	01/12/2026	Option Granted - 01/31/2024	Issuer			9905	01/12/2026	Cash
Common	01/12/2026	Option Granted - 09/01/2020	Issuer			16636	01/12/2026	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

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many MBX common shares are covered by this Form 144 filing?

The Form 144 covers a proposed sale of 30,864 shares of MBX common stock.

What is the aggregate market value of the MBX shares to be sold?

The 30,864 common shares have an aggregate market value of $1,102,991.13 as stated in the filing.

How were the MBX shares in this Form 144 acquired?

The shares were acquired by exercising stock options granted on 09/12/2024, 01/31/2024, and 09/01/2020, with cash payment on 01/12/2026.

Which broker and exchange are involved in the planned MBX share sale?

The planned sale will be executed through Fidelity Brokerage Services LLC, with the common stock listed on NASDAQ.

How many MBX common shares were outstanding according to this filing?

The filing reports that 44,902,302 common shares were outstanding.

What representation does the seller make in the MBX Form 144?

By signing, the seller represents they do not know of any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.