Monolithic Power Systems filings document regulatory disclosures for a fabless semiconductor company focused on power electronics solutions. Its 8-K filings furnish quarterly and annual operating results, earnings commentary, cash dividend declarations, officer-transition disclosures, and other material events tied to financial reporting.
The filing record also includes proxy materials covering annual meeting matters, director and executive compensation disclosures, and stockholder voting procedures. Other filings describe governance amendments such as bylaw changes affecting special-meeting rights, and reporting-controls matters including non-reliance determinations and restatement-related disclosures for previously issued financial statements.
Theodore Bernhard Blegen reported multiple sales of Common Stock in a Form 144 notice. The excerpt lists four transactions dated 01/02/2026, 02/02/2026, 02/06/2026, and 03/02/2026 with share amounts of 3,000, 3,000, 21,725, and 3,000 respectively and dollar amounts shown for each sale.
Saria Tseng submitted a Form 144 notice relating to proposed sales of Common stock, listing 25,674 shares tied to Performance Shares with an original grant date of 08/07/2021. The filing also records a reported sale of 22,876 shares on 02/06/2026.
Monolithic Power Systems Inc: Schedule 13G/A Amendment
The Vanguard Group filed Amendment No. 15 reporting 0 shares beneficially owned of Monolithic Power Systems Inc Common Stock, representing 0% of the class. The filing explains an internal realignment effective January 12, 2026, and disaggregation of certain Vanguard subsidiaries under SEC Release No. 34-39538.
Monolithic Power Systems EVP Maurice Sciammas reported an open-market sale of 30 shares of common stock on March 20, 2026. The sale was executed indirectly through the Clement Sciammas Trust at a weighted average price of $1,095.07 per share, with individual prices ranging from $1,094.79 to $1,095.19. Following the sale, the trust held 1,269 shares, while Sciammas also reported 178,644 shares held directly and additional indirect holdings through various family trusts and accounts. The transaction was carried out under a Rule 10b5-1 trading plan adopted on November 19, 2025.
MPWR affiliate(s) reported proposed dispositions of Common Stock. The notice lists multiple transactions by Maurice Sciammas and The Sciammas Trust, including dispositions on 02/04/2026 (21,590 shares), 02/06/2026 (1,286 shares), and 02/10/2026 (200 shares). The excerpt also records a gift of 120 shares dated 05/28/2025.
Monolithic Power Systems interim CFO Robert W. Dean II filed an initial ownership report showing his stake in the company’s common stock. He reports 8,060 shares held directly, which include 1,420 restricted stock units that vest over scheduled dates through February 15, 2030, subject to continued employment. He also reports 65 shares held indirectly, described as being held by “Parent & Daughter.” This filing does not reflect new buying or selling activity, but establishes his current ownership position as an executive officer.
Theodore Bernhard Blegen submitted a Rule 144 notice reporting the proposed sale of 3,000 performance shares of common stock. The filing also lists three recent dispositions: 21,725 shares on 02/06/2026 for $25,443,531.38, 3,000 shares on 02/02/2026 for $3,389,269.80, and 3,000 shares on 01/02/2026 for $2,821,403.10.
Monolithic Power Systems is restating prior financial statements after identifying an unintentional error in accounting for deferred income taxes tied to a one-time foreign tax incentive. The correction reduces income tax benefit and net deferred income taxes by $194.6 million for the year ended December 31, 2024.
Earlier audited 2024 results and each 2025 quarterly report should no longer be relied on, and this annual report includes restated consolidated and quarterly financials. Management warns the restatement may affect investor confidence and increase professional costs, and it also discloses a material weakness that must be remediated.
The company remains a fabless analog and mixed-signal semiconductor provider with strong exposure to Asia, where 92% of 2025 revenue was generated. Key end markets include storage and computing, enterprise data and automotive, and risk factors highlight macroeconomic, China, supply-chain, customer concentration, and cybersecurity and AI-related regulatory risks.
Monolithic Power Systems declared that investors should no longer rely on its 2024 audited financial statements and 2025 quarterly results because of an unintentional tax accounting error tied to a one-time foreign tax incentive. The issue is non-cash, affects only income tax accounting, and involved no misconduct.
For 2024, the restatement reduces the income tax benefit and deferred taxes by about $195 million, lowering net income to $1,592 million. Non-GAAP metrics such as revenue, non-GAAP gross margin and non-GAAP net income are unchanged.
For 2025, the adjustment decreases income tax expense by $5.5 million, increasing net income by the same amount. The company says its business outlook for the quarter ending March 31, 2026 remains intact and will include the restated figures in its 2025 Form 10-K.
Monolithic Power Systems CEO Michael Hsing reported a series of open-market sales of company common stock on February 12, 2026. The Form 4 shows multiple sale transactions at prices ranging from $1,155.71 to $1,217.12 per share, including 12,731 shares at $1,155.71 and 4,992 shares at $1,159.84.
After these sales, Hsing held 888,234 shares directly. He also had indirect beneficial ownership of 133,040 shares through the M Hsing 04 Trust and 12,825 shares through the ZH Family 2020 Trust. The filing notes the transactions were made under a Rule 10b5-1 trading plan adopted on August 28, 2025.