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Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

 

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of First Internet Bancorp (the “Company") on Form 10-K for the period ended December 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned, 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.

/s/ David B. Becker
David B. Becker
Chief Executive Officer
March 12, 2025
/s/ Kenneth J. Lovik
Kenneth J. Lovik
Chief Financial Officer
March 12, 2025