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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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FORM 8-K

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CURRENT REPORT

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Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): March 26, 2026

METAVIA INC.

(Exact name of Registrant as Specified in Its Charter)

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Delaware | ​ | 001-37809 | ​ | 47-2389984
(State or other jurisdiction of incorporation) | ​ | (Commission File Number) | ​ | (IRS Employer Identification No.)

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545 Concord Avenue, Suite 210 Cambridge, Massachusetts ​ | ​ | 02138
(Address of principal executive offices) | ​ | (Zip Code)

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(857) 702-9600

(Registrant’s telephone number, including area code)

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Not applicable

(Former name or former address, if changed since last report)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

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☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Securities registered pursuant to Section 12(b) of the Act:

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Title of each class | ​ ​ ​ | Trading Symbol(s) | ​ ​ ​ | Name of each exchange on which registered
Common Stock, par value $0.001 per share |  | MTVA |  | The Nasdaq Stock Market LLC

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

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Emerging growth company ☐

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 7.01.Regulation FD Disclosure.

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On March 26, 2026, MetaVia Inc. (the “Company”) posted an updated corporate presentation to its website at https://ir.metaviatx.com/events-presentations/presentations, which the Company may use from time to time in connection with presentations, investor communications or conferences. A copy of the corporate presentation is attached as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”) and is incorporated herein by reference.

Information contained on or accessible through any website reference in the corporate presentation is not part of, or incorporated by reference in, this Report, and the inclusion of such website addresses in this Report by incorporation by reference of the corporate presentation is as inactive textual references only.

The information in this Report, including Exhibit 99.1 hereto, is furnished pursuant to Item 7.01 and shall 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 liabilities of that Section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing. The Company’s submission of this Report shall not be deemed an admission as to the materiality of any information required to be disclosed solely to satisfy the requirements of Regulation FD.

Forward-Looking Statements

Exhibit 99.1 attached hereto contains forward-looking statements within the meaning of the federal securities laws. These forward-looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other reports of the Company filed with the Securities and Exchange Commission, including that actual events or results may differ materially from those in the forward-looking statements.

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Item 9.01.Financial Statements and Exhibits.

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(d) Exhibits

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Exhibit Number | ​ ​ ​ | Exhibit Description
99.1 | ​ | Corporate Presentation, March 2026.
104 | ​ | Cover Page Interactive Data File (embedded within Inline XBRL document).

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Signatures

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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​ | ​ ​ ​ | METAVIA INC.
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Date: March 26, 2026 | ​ | By: | /s/ Hyung Heon Kim
​ | ​ | ​ | Hyung Heon Kim
​ | ​ | ​ | President and Chief Executive Officer

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