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 executive Maurice Sciammas, EVP of Worldwide Sales & Marketing, reported open-market sales of 12,000 shares of common stock on May 15, 2026. The shares were sold in multiple transactions at prices generally ranging from about $1,550 to $1,586 per share.
The filing states these sales were made under a Rule 10b5-1 trading plan adopted on November 24, 2025, indicating they were pre-arranged. Following the transactions, Sciammas directly holds 166,644 shares of Monolithic Power Systems common stock, in addition to various indirect holdings through family trusts and related accounts.
Robert Dean filed a Form 144 reporting proposed sale activity in Common Stock. The filing lists a prior sale of 85 shares on 02/23/2026 for $101,787.00. The excerpt also references time-based restricted stock units dated 05/15/2026 and contains broker/contact information for Morgan Stanley Smith Barney LLC.
MONOLITHIC POWER SYSTEMS INC executive Maurice Sciammas reported intra-family gifts of company common stock. On 2026-05-13, entities associated with him made two bona fide gift transfers totaling 3,126 shares, with 1,563 shares moved in each transaction.
The shares were transferred between three GRATs and the Sciammas Family Trust, all of which list him as a trustee. Footnotes state no funds were exchanged and no sale of shares occurred, meaning these are non-market, non-cash movements of existing holdings.
After these transfers, the Sciammas Family Trust held 51,023 shares and various Sciammas GRATs held 25,097 shares. Separately, Sciammas is shown with 178,644 shares held directly, plus additional indirect positions through several other family trusts and accounts.
MPWR filing reports proposed resale of 12,000 common shares through Morgan Stanley Smith Barney LLC with an execution date listed as 05/15/2026 on NASDAQ. The filing also lists performance shares dated 10/25/2025 totaling 12,000 and recent sales by Maurice Sciammas: 380, 30, 30, and 30 common shares on 05/05/2026, 05/04/2026, 04/01/2026, and 03/20/2026, respectively.
MONOLITHIC POWER SYSTEMS INC interim CFO Robert W. Dean II reported a non-market share transfer. On 2026-05-13, a Form 4 shows an "other" transaction moving 2,156 shares of common stock from his direct holdings.
The filing states no funds were exchanged, no sale occurred, and he no longer has any pecuniary interest in the transferred shares, indicating a non-cash disposition. After this restructuring, he reports 5,904 common shares held directly and 65 shares held indirectly under "Held by Parent & Daughter."
Monolithic Power Systems director Eugen J. Elmiger sold 12,000 shares of Common Stock in open-market transactions. The trades occurred on May 6, 2026 across multiple price levels, with individual line items showing sale prices between $1,559.88 and $1,600.14 per share. Following these sales, Elmiger directly holds 5,402 shares of Monolithic Power Systems common stock.
Monolithic Power Systems EVP Deming Xiao reported sizable insider sales of common stock. On May 6, 2026, he executed open-market sales totaling 30,000 shares of MPWR common stock across four transactions at prices between $1,648.38 and $1,661.38 per share. Following these sales, Xiao directly holds 205,959 shares of common stock. The filing also reports indirect holdings of 4,336 shares held by the Christopher Chao Xiao Trust and 20,455 shares held by his spouse, reflecting additional exposure to the company’s stock. A footnote notes that the ending balance includes 27 shares acquired earlier through the company’s qualified employee stock purchase plan.
Monolithic Power Systems director Eileen Wynne sold shares in an open-market trade. On May 6, 2026, she sold 335 shares of Common Stock at an average price of $1,582.68 per share. After this sale, she directly held 1,007 shares of Monolithic Power Systems stock.
MPWR submitted a Form 144 notice relating to proposed sales of Common Stock and disclosed several Restricted Stock Units grant dates and quantities. The excerpt lists numeric values including 12000, 19,828,200.00, and 49,135,998, with an apparent date of 05/07/2026 and NASDAQ as the market. The filing also itemizes specific RSU awards dated from 10/23/2012 through 02/07/2018 with award counts (for example, 1,235, 3,493, 2,553).