Welcome to our dedicated page for MONOLITHIC POWER SYSTEMS SEC filings (Ticker: MPWR), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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Monolithic Power Systems EVP Maurice Sciammas, through the Clement Sciammas Trust, sold 30 shares of common stock in an open-market transaction at $1,116.44 per share on April 1, 2026.
The trust held 1,239 shares after the sale as indirect ownership. Sciammas also held 178,644 shares directly, while other related trusts and accounts held additional indirect positions, including 49,460 shares in the Sciammas Family Trust and 26,660 shares in various Sciammas GRATs. The sale was made under a Rule 10b5-1 trading plan adopted on November 19, 2025.
Monolithic Power Systems EVP & General Counsel Saria Tseng reported selling a total of 25,674 shares of common stock in multiple open-market transactions on March 30, 2026. The weighted-average sale prices for these trades ranged from about $998 to $1,042 per share, as detailed in price-range footnotes.
The filing notes these transactions were executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 28, 2025. After the sales, Tseng directly holds 174,982 shares and has an additional 1,000 shares held indirectly through the C&T Discovery Foundation.
Morgan Stanley Smith Barney LLC submitted a Form 144 notice relating to Common stock described as Performance Shares. The filing lists 1400 in the securities row and records recent sales by Saria Tseng: 22,876 shares on 02/06/2026 and 25,674 shares on 03/30/2026.
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.