Form 8-K

8-K — MetaVia Inc.

Accession: 0001104659-26-080316

Filed: 2026-07-02

Period: 2026-07-02

CIK: 0001638287

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — tm2618959d1_8k.htm (Primary)

EX-5.1 — EXHIBIT 5.1 (tm2618959d1_ex5-1.htm)

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0001638287

METAVIA INC.

0001638287

2026-07-02

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

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

Exchange Act of 1934

Date of Report (Date of earliest event reported): July

2, 2026

Metavia

inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware

001-37809

47-2389984

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

545

Concord Avenue, Suite 210

Cambridge,

Massachusetts

(Address of principal executive offices)

02138

(Zip Code)

(857)

702-9600

(Registrant’s telephone number,

including area code)

Not applicable

(Former name or former address, if changed

since last report)

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:

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))

Securities

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

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

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).

Emerging

growth company ¨

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. ¨

Item 8.01 Other Events.

On November 6, 2025, MetaVia

Inc. (the “Company”) entered into an At The Market Offering Agreement (the “Sales Agreement”) with Ladenburg

Thalmann & Co. Inc., as sales agent and/or principal (“Ladenburg”), pursuant to which the Company may offer and sell,

from time to time through or to Ladenburg, shares of the Company’s common stock, par value $0.001, by any method permitted by law

deemed to be an “at the market offering” as defined in Rule 415(a)(4) of the U.S. Securities Act of 1933, as amended. On July

2, 2026, the Company filed a prospectus supplement with the Securities and Exchange Commission for the offer and sale of up to $4,000,000

of shares of common stock pursuant to the Sales Agreement (the “Prospectus Supplement”).

Honigman LLP, counsel to the

Company, has issued an opinion regarding the validity of the shares of common stock to be issued and sold pursuant to the Sales Agreement

and the Prospectus Supplement. A copy of the opinion is filed as Exhibit 5.1 to this Current Report on Form 8-K.

This Current Report on Form 8-K shall

not constitute an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sale of these securities in

any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under

the securities laws of any such state or other jurisdiction.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

Exhibit

Number

Exhibit Description

5.1

Opinion of Honigman LLP.

104

Cover Page Interactive Data File (embedded within Inline XBRL document).

SIGNATURES

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.

MetaVia Inc.

Date: July 2, 2026

By:

/s/ Hyung Heon Kim

Hyung Heon Kim

President and Chief Executive Officer

EX-5.1 — EXHIBIT 5.1

EX-5.1

Filename: tm2618959d1_ex5-1.htm · Sequence: 2

Exhibit 5.1

July 2, 2026

MetaVia Inc.

545 Concord Avenue, Suite 210

Cambridge, Massachusetts 02138

Re:

Prospectus Supplement to Registration Statement on Form S-3 (File No. 333-278646)

Ladies and Gentlemen:

We have acted as special counsel

to MetaVia Inc., a Delaware corporation (the “Company”), in connection with the sale by the Company through

Ladenburg Thalmann & Co. Inc., as the sales agent (the “Sales Agent”), from time to time of up to $4,000,000

of shares (the “Shares”) of the Company’s common stock, par value $0.001 per share (the “Common

Stock”) pursuant to (i) a registration statement on Form S-3 (File No. 333-278646) under the Securities

Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”)

on April 12, 2024 (as so filed and as amended, the “Registration Statement”), (ii) the base prospectus

included in the Registration Statement (the “Base Prospectus”), (iii) the prospectus supplement dated as

of November 6, 2025 (the “Initial ATM Prospectus Supplement”), (iv) the prospectus supplement dated

as of July 2, 2026 (the “Prospectus Supplement”, and together with the Base Prospectus, the Initial ATM

Prospectus Supplement and any further supplements or amendments thereto, the “Prospectus”), and (v) that

certain At The Market Offering Agreement, dated as of November 6, 2025, by and between the Company and the Sales Agent (the “Sales

Agreement”).

In so acting, we have considered

such matters of law and of fact, and relied upon, without independent investigation, such documents, records, certificates and other information

furnished to us as we have deemed appropriate as a basis for our opinions set forth below. In conducting such review, we have assumed,

without independent investigation, the genuineness and authenticity of all signatures on original documents, the legal capacity of all

natural persons or entities (other than the Company), the authenticity and completeness of all documents submitted to us as originals,

the conformity to authentic original documents of all documents submitted to us as copies, and the accuracy of all statements in certificates

of public officials and officers of the Company that we reviewed. In rendering these opinions, we have assumed that the Shares will be

offered in the manner and on the terms identified or referred to in the Registration Statement, the Prospectus, and the Sales Agreement.

The law covered by the opinions

expressed in this opinion letter is limited to the General Corporation Law of the State of Delaware as currently in effect (the “DGCL”).

We express no opinion as to any other laws.

Based on the foregoing and

upon our examination of such documents and other matters as we deem relevant, we are of the opinion that the Shares have been duly authorized

by the Company and, when issued, sold, and delivered by the Company in accordance with, and as described in the Registration Statement

and the Prospectus and in the manner set forth in the Sales Agreement, against payment therefor in excess of par value, will be validly

issued, fully paid and non-assessable.

Honigman LLP • 650 Trade Centre Way Suite 200

• Kalamazoo, MI 49002

MetaVia Inc.

July 2, 2026

Page 2

In rendering the foregoing

opinions, we have assumed that (i) the Company will comply with all applicable notice requirements regarding uncertificated shares

provided in the DGCL, (ii) upon the issuance of any of the Shares, the total number of shares of Common Stock issued and outstanding

will not exceed the total number of shares of Common Stock that the Company is then authorized to issue under the Company’s Third

Amended and Restated Certificate of Incorporation, as amended from time to time (the “Certificate of Incorporation”),

and (iii) certain terms of the Shares to be issued by the Company from time to time will be authorized and approved by the board

of directors of the Company or one or more committees or delegees thereof established by the board of directors of the Company with the

authority to issue and sell Shares pursuant to the Sales Agreement in accordance with the DGCL, the Certificate of Incorporation, the

bylaws of the Company and certain resolutions of the board of directors of the Company and one or more committees thereof prior to issuance

thereof.

We hereby consent to the filing

of this opinion letter with the Commission as Exhibit 5.1 to the Company’s Current Report on Form 8-K, which is

incorporated by reference in the Registration Statement, and to the reference to our firm under the caption “Legal Matters”

in the Registration Statement and the Prospectus. In giving such consent, we do not admit that we are within the category of persons whose

consent is required by Section 7 of the Act or the rules and regulations promulgated thereunder by the Commission. The opinions

in this opinion letter are expressed as of the date hereof, and we disclaim any undertaking to advise you of any subsequent changes in

the facts stated or assumed herein or of any subsequent changes in applicable law.

Very truly yours,

/s/ Honigman LLP

Honigman LLP

Honigman LLP • 650 Trade Centre Way Suite 200

• Kalamazoo, MI 49002

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