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MBX Biosciences, Inc.

For the period ended Dec 31, 2025. Filed Mar 12, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Mar 12, 2026

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

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Contents

Item 2. Properties

Our principal executive offices are located in Carmel, Indiana. We lease our office space, which consists of 8,260 square feet. Our lease expires on December 31, 2028, with the option to renew for an additional three-year period. We also lease 810 square feet of laboratory space in Indianapolis, Indiana, under a lease that expires on November 30, 2026, and we previously leased 1,580 square feet of laboratory space in Indianapolis, Indiana, under a lease that expired on December 31, 2025. In

February 2026, we entered into a lease for an additional 13,642 square feet laboratory and office space in Burlington, Massachusetts, which is expected to commence in May 2026. We believe our current facilities are sufficient to meet our needs until the expiration of our leases. To meet the future needs of our business, we may lease additional or alternate space. We believe that suitable additional or substitute space at commercially reasonable terms will be available as needed to accommodate any future expansion of our operations.

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