MPWR: Other company developments

Item 8.01 Other Events. On September 10, 2026, the Company issued a press release announcing the third quarter cash dividend of $2.00 per share to all stockholders of record as of the close of business on September 30, 2026. The dividend will be paid to stockholders on October 15, 2026. A copy of the press release is attached hereto as Exhibit 99.1. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Description 99.1 Press release issued on September 10, 2026. 104 Cover Page Interactive Data File (embedded within the Inline XBRL Document). 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 undersigned, thereunto duly authorized. Date: September 10, 2026 By: /s/ Robert Dean Robert Dean Interim Chief Financial Officer