---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-258417"
form_type: "8-K"
ticker: "MBX"
cik: "0001776111"
company_name: "MBX Biosciences, Inc."
filed_at: "2026-06-05T11:52:37+00:00"
generated_at: "2026-06-05T11:55:11.563675+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# MBX Biosciences shareholders elect two directors, ratify auditor at 2026 annual meeting

## Summary
- Elected Patrick J. Heron and Edward T. Mathers as Class II directors until 2029 annual meeting.
- Ratified Ernst & Young LLP as independent auditor for fiscal year ending December 31, 2026.
- Heron received 35,007,623 votes for, 4,579,129 withheld; Mathers 31,983,223 for, 7,603,529 withheld.
- Auditor ratification: 43,713,693 for, 1,946 against, 1,946 abstain; no broker non-votes.
- Record date April 10, 2026: 47,570,485 shares outstanding.

## SEC filing metadata
- accession: 0001193125-26-258417
- form_type: 8-K
- ticker: MBX
- cik: 0001776111
- company_name: MBX Biosciences, Inc.
- filed_at: 2026-06-05T11:52:37+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.02, 5.07
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1776111/000119312526258417/0001193125-26-258417-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1776111/000119312526258417/mbx-20260604.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-258417
- JSON: https://secwatch.observer/filing/0001193125-26-258417.json
- Plain text: https://secwatch.observer/filing/0001193125-26-258417.txt

## Key facts
- Shareholder Votes
  MBX Biosciences, Inc. shareholders approved 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. at the 2026-06-04 meeting.
  - Proposal: director election
  - Outcome: passed
  - Meeting: 2026-06-04
  source text: 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").
  evidence_url: https://www.sec.gov/Archives/edgar/data/1776111/000119312526258417/0001193125-26-258417-index.htm
- Shareholder Votes
  MBX Biosciences, Inc. shareholders approved Ratify the appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2026. at the 2026-06-04 meeting.
  - Proposal: auditor ratification
  - Outcome: passed
  - Meeting: 2026-06-04
  source text: 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: For Against Abstain Broker Non-Votes 43,713,693 1,946 1,946 -
  evidence_url: https://www.sec.gov/Archives/edgar/data/1776111/000119312526258417/0001193125-26-258417-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.