EX-32.1 4 mxct-20250930xex32d1.htm EX-32.1

EXHIBIT 32.1

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CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

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 of MaxCyte, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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| (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

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

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Date: November 13, 2025 | By: | /s/ Maher Masoud
​ | Name: | Maher Masoud
​ | Title: | President and Chief Executive Officer
​ | ​ | (Principal Executive Officer)

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