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.
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.
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).
MONOLITHIC POWER SYSTEMS INC director Jeff Zhou sold 1,514 shares of Common Stock in open-market transactions. The sales occurred on May 5 and May 6, 2026, at prices between $1,574.48 and $1,650.00 per share. After these transactions, Zhou directly holds 4,286 shares of Monolithic Power Systems common stock.
Jeff Zhou reported proposed sales of 500 shares of Common Stock under Rule 144 and disclosed recent dispositions. The filing lists 500 restricted shares (originally dated 02/07/2013) as the securities to be sold and shows 1,014 shares sold on 05/05/2026 for $1,609,285.29.
Monolithic Power Systems EVP Maurice Sciammas reported an indirect open-market sale of 380 shares of common stock at $1,583.81 per share through the Rosalind Sciammas Brokerage Account on May 5, 2026, leaving 919 shares in that account. The filing also lists multiple indirect trust and GRAT holdings and shows a separate direct holding of 178,644 common shares as of the same date.