MBX Biosciences Inc. filed SEC Form 8-K: Leadership Update, Submission of Matters to a Vote of Security Holders

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

MBX Biosciences, Inc.

(Exact name of Registrant as Specified in Its Charter)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On June 4, 2026, MBX Biosciences, Inc. (the "Company") held its 2026 annual meeting of stockholders (the "Annual Meeting"). As further described under Item 5.07 below, the Company's stockholders approved the election of two Class II directors to serve for a three-year term ending at the annual meeting of stockholders to be held in 2029.

Item 5.07 Submission of Matters to a Vote of Security Holders.

The Company held its Annual Meeting on June 4, 2026. As of April 10, 2026, the record date for the Annual Meeting, there were 47,570,485 shares outstanding shares of the Company's common stock. The Company's stockholders voted on the following matters, which are described in detail in the Proxy Statement: (i) to elect two Class II director nominees, Patrick J. Heron. and Edward T. Mathers, to the Company's Board of Directors, each to hold office until the Company's 2029 annual meeting of stockholders and until their successors are duly elected and qualified, subject to their earlier death, resignation or removal ("Proposal 1") and (ii) to ratify the appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2026 ("Proposal 2").

The Company's stockholders approved the Class II director nominees recommended for election in Proposal 1 at the Annual Meeting. The Company's stockholders voted for Class I directors as follows:

The Company's stockholders approved Proposal 2 to ratify the appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2026. The votes cast at the Annual Meeting were as follows:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.