AMERANT BANCORP INC.

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 Amerant Bancorp Inc. (the “Company”) on Form 10-K for the year ended December 31, 2020, as filed with the Securities and Exchange Commission as of the date hereof (the “Report”), I, Millar Wilson, Vice-Chairman and Chief Executive Officer of the Company, 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, as amended; 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 19, 2021

/s/ Millar Wilson

Millar Wilson

Chief Executive Officer