MBX Biosciences (MBX) investor relations material

Opening remarks and agenda

• Meeting called to order, minutes recorded by legal counsel, and agenda based on notice and proxy statement mailed to stockholders.

• Directors and audit firm representatives introduced; meeting held in accordance with bylaws and Delaware law.

• Stockholders entitled to vote as of April 10, 2026, with records available for inspection prior to the meeting.

• Voting and question procedures explained, with Inspector of Elections appointed and polls opened at 8:03 A.M.

Board and executive committee updates

• Two nominees, Patrick J. Heron and Edward T. Mathers, put forward for election as Class II directors to serve until 2029.

• No stockholder nominations received; board unanimously recommends voting in favor.

Corporate governance

• Audit committee, comprised entirely of independent directors, appointed Ernst & Young LLP as independent auditor for 2026.

• Board submits auditor ratification to stockholders as a matter of good governance, though not required by bylaws.