mpwr20260527

SD 1 mpwr20260527_sd.htm FORM SD mpwr20260527_sd.htm

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

Specialized Disclosure Report

MONOLITHIC POWER SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

Delaware

000-51026

77-0466789

(State or other jurisdiction of
incorporation or organization)

(Commission File Number)

(I.R.S. Employer

Identification Number)

1555 Palm Beach Lakes Blvd.,
West Palm Beach, FL 33401

(Address of principal executive offices) (Zip Code)⁽¹⁾

Robert Dean

Interim Chief Financial Officer

(561) 839-3999

(Name and telephone number, including area code, of the

person to contact in connection with this report)

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:

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

☐ Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13q-1) for the fiscal year ended .

__________

(1)	We have operations in multiple locations in the U.S., Europe and Asia and have not identified a single location as the Company’s headquarters. We are including this address to comply with the Securities and Exchange Commission’s requirements.

Section 1 – Conflict Minerals Disclosure

Item 1.01 and 1.02 Conflict Minerals Disclosure and Report, Exhibit

Conflict Minerals Disclosure

A copy of Monolithic Power Systems, Inc.’s Conflict Minerals Report for the reporting period from January 1, 2025 to December 31, 2025 is provided as Exhibit 1.01 hereto and is publicly available at https://www.monolithicpower.com/about-mps/policies-and-documents.html*.

Section 2 – Resource Extraction Issuer Disclosure

Item 2.01 Resource Extraction Issuer Disclosure and Report

Not Applicable.

Section 3 – Exhibits

Item 3.01 Exhibits

Exhibit 1.01 - Conflict Minerals Report for the reporting period from January 1, 2025 to December 31, 2025.

*	The reference to Monolithic Power Systems, Inc.’s website is provided for convenience only, and its contents are not incorporated by reference into this Form SD and the Conflict Minerals Report nor deemed filed with the U.S. Securities and Exchange Commission.

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.

Date: May 29, 2026	By:	/s/ Robert Dean
		Robert Dean
		Interim Chief Financial Officer

SEC Form SD filed by Monolithic Power Systems Inc.