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MBX Biosciences, Inc.

For the period ended Mar 31, 2026. Filed May 7, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 7, 2026

MBX$54.06+5.3%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

Item 6. Exhibits

ExhibitNumberDescription
3.1Fourth Amended and Restated Certificate of Incorporation of MBX Biosciences, Inc. (as currently in effect) (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K (File No. 001-42272) filed with the SEC on September 16, 2024).
3.2Amended and Restated Bylaws of MBX Biosciences, Inc. (as currently in effect) (incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K (File No. 001-42272) filed with the SEC on September 16, 2024).
4.1+Second Amended and Restated Investors’ Rights Agreement among the Registrant and certain of its stockholders, dated August 2, 2024) (incorporated by reference to Exhibit 4.1 to the Registrant’s Registration Statement on Form S-1 (File No. 333-281764) filed with the SEC on September 9, 2024).
4.2Form of Common Stock Certificate (incorporated by reference to Exhibit 4.2 to the Registrant’s Registration Statement on Form S-1 (File No. 333-281764) filed with the SEC on September 9, 2024).
10.1#*Consulting Agreement between MBX Biosciences, Inc. and Steven L. Hoerter dated May 1, 2026.
10.2#*Non-Employee Director Compensation Policy, as amended.
10.3#2026 Inducement Plan and form of award agreement thereunder (incorporated by reference to Exhibit 10.4 to the Registrant's Annual Report on Form 10-K filed with the SEC on March 12, 2026.
10.4#Separation Agreement between the Registrant and Rick Bartram, Chief Financial Officer, to be in effect on March 15, 2026 (incorporated by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed with the SEC on February 27, 2026).
10.5#Consulting Agreement between MBX Biosciences, Inc. and Richard Bartram dated February 25, 2026 (incorporated by reference to Exhibit 10.3 to the Registrant's Current Report on Form 8-K filed with the SEC on February 27, 2026).
10.6#Employment Agreement between the Registrant and John Smither, Interim Chief Financial Officer, to be in effect March 16, 2026 (incorporated by reference to Exhibit 10.4 to the Registrant's Current Report on Form 8-K filed with the SEC on February 27, 2026).
10.7†Lease Agreement between MBX Biosciences, Inc. and 5 Burlington Woods, LLC dated February 24, 2026 (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed with the SEC on February 27, 2026).
31.1*Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because XBRL tags are embedded within the Inline XBRL document.
101.SCH*Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents
104*Cover Page Interactive Data File (embedded within the Inline XBRL document)
  • Filed herewith.

**This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent specifically incorporated by reference into such filing.

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.