EX-32.1 7 mtva-20251231xex32d1.htm EX-32.1

Exhibit 32.1

​

Certification of Chief Executive Officer

under Section 906 of the Sarbanes-Oxley Act of 2002

(18 U.S.C. § 1350)

​

In connection with the Annual Report of MetaVia Inc. (the “Company”) on Form 10-K for the year ended December 31, 2025 as filed with the Securities and Exchange Commission (the “Report”), I, Hyung Heon Kim, President and Chief Executive Officer, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

​

| (1) | the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and |

​

| (2) | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. |

​

​

​ | ​
Date: March 26, 2026 | /s/ Hyung Heon Kim
​ | President and Chief Executive Officer
​ | (Principal Executive Officer)
​ |

​

​