EX-32.1 4 ganx-20260331xex32d1.htm EX-32.1

Exhibit 32.1

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Certification of CEO and PFO Pursuant to

18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

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In connection with the Quarterly Report on Form 10-Q of Gain Therapeutics, Inc. (the "Company") for the quarterly period ended March 31, 2026 to which this certification is attached as Exhibit 32.1 (the “Report”), Gene Mack, as Chief Executive Officer of the Company, and Gianluca Fuggetta, as Principal Financial Officer of the Company, each hereby certifies, pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §-1350), that, to the best of their knowledge:

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

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

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Date: May 11, 2026

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/s/ | ​
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​ | /s/ Gene Mack
​ | Gene Mack
​ | Chief Executive Officer
​ | (Principal Executive Officer)

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​ | ​
​ | /s/ Gianluca Fuggetta
​ | Gianluca Fuggetta
​ | Senior Vice President Finance
​ | (Principal Financial Officer and Principal Accounting Officer)

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This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Gain Therapeutics, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.