MPWR: Other company developments

Item 8.01 Other Events. On June 12, 2026, the Company issued a press release announcing the second quarter cash dividend of $2.00 per share to all stockholders of record as of the close of business on June 30, 2026. The dividend will be paid to stockholders on July 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 June 12, 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: June 12, 2026 By: /s/ Saria Tseng Saria Tseng Executive Vice President, General Counsel