CSP (CSPI) 10-Q2023 Q1 Quarterly report

Exhibit 32.1

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18 U.S.C. Section 1350,

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AS ADOPTED PURSUANT TO

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SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

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In connection with the Quarterly Report on Form 10-Q of CSP Inc. (the “Company”) for the quarter ended December 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned Chief Executive Officer, President and Chairman and Chief Financial Officer of the Company, certifies, to the best knowledge and belief of the signatory, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 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; 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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