Form SD CSP INC /MA/

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

Specialized Disclosure Report

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CSP Inc.

(Exact name of registrant as specified in its charter)

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Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

XRule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2025.

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Section 1 - Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

This Form SD of CSP Inc. (the “Company”) is filed pursuant to Rule 13p-1 promulgated under the Securities Exchange Act of 1934, as amended, for the reporting period January 1, 2025 to December 31, 2025. A copy of the Company’s Conflict Minerals Report is available at https://investorrelations.cspi.com/governance/governance-documents/Minerals-Policy/default.aspx.

Item 1.02 Exhibit

The Company is filing its Conflict Minerals Report as Exhibit 1.01 to this Form SD.

Section 2 - Resource Extraction Issuer Disclosure and Report

Item 2.01 Resource Extraction Issuer Disclosure and Report

Not applicable

Section 3 - Exhibits

Item 3.01 Exhibits

The following exhibit is filed as part of this report.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.

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