MPWR MONOLITHIC POWER SYSTEMS, INC.

“the Company s ability to timely and adequately remediate its material weakness and other important risk factors identified under the caption Risk Factors and elsewhere in our Securities and Exchange Commission ( SEC ) filings”

“during the year-end financial reporting process for fiscal year 2025, a material weakness was identified in internal control over financial reporting related to the accounting for deferred income taxes.”

“Based on this evaluation, and due to the finding of the material weakness described below, our Chief Executive Officer, Chief Financial Officer, and Chief Accounting Officer concluded that, as of September 30, 2026, our disclosure controls and procedures were not effective to provide reasonable assurance”

“the factors that differentiate us from our competitors; and our ability to timely and adequately remediate our material weakness.”