Welcome to our dedicated page for Monolithic Power 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 EVP Maurice Sciammas reported a small preplanned insider sale through a family trust. A trust named Clement Sciammas Trust sold 30 shares of common stock at $1,533.95 per share in an open-market transaction made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025. Following this sale, that trust held 1,179 shares indirectly, while Sciammas also reported 166,644 shares held directly, suggesting this was a minor, routine disposition relative to his overall reported holdings.
Monolithic Power Systems executive Maurice Sciammas reported a bona fide gift of 12,472 shares of Common Stock held through various Sciammas GRATs. The shares were distributed from these grantor retained annuity trusts to individuals who are not immediate family members sharing the same household.
No funds were exchanged and no sale of shares occurred in these distributions, so this is a non-cash transfer rather than a market trade. After the distributions, the GRATs and Sciammas no longer have any pecuniary interest in the gifted shares, while separate direct and indirect Common Stock holdings are reported, including 166,644 shares held directly and 12,625 shares held indirectly through various Sciammas GRATs.
Theodore Bernhard Blegen filed a notice under Form 144 reporting proposed sales of Common Stock through Morgan Stanley Smith Barney. The filing lists prior sales of 3,000 shares on 05/01/2026 ($4,638,874.80), 3,000 shares on 04/01/2026 ($3,343,033.50), and 3,000 shares on 03/02/2026 ($3,349,516.50).
Monolithic Power Systems' EVP & General Counsel, Saria Tseng, reported an open-market sale of company stock. On May 27, 2026, she sold 7,565 shares of Common Stock at a price of $1,700 per share, and now holds 144,218 shares directly.
The filing also shows an indirect holding of 1,000 shares attributed to the C&T Discovery Foundation, recorded as a holding entry rather than a new trade.
Monolithic Power Systems’ interim CFO Robert W. Dean II reported a small, tax-related share sale. On 2026-05-26, he sold 22 shares of common stock at a weighted average price of $1,649.56 per share to cover tax withholding obligations tied to vested restricted stock units. After this transaction, he directly held 5,878 common shares and indirectly held 65 additional shares through an account noted as held by parent and daughter. The filing indicates a routine tax-withholding event rather than a discretionary reduction of his ownership stake.
MPWR related filing reports proposed and recent dispositions of Common Stock by an affiliated selling holder. The filing lists four blocks of Performance Shares eligible for sale (2,980; 811; 2,377; 1,397 shares) and multiple sales by Saria Tseng in the past three months (examples: 25,674 shares on 03/30/2026, 8,964 shares on 04/08/2026). The filing is a regulatory notice of resale activity.
Monolithic Power Systems director Jeff Zhou sold 486 shares of Common Stock in an open-market sale at $1,680 per share. This transaction reduced his direct holdings to 3,800 shares after the sale, indicating a partial, not complete, trim of his position.
Monolithic Power Systems EVP & General Counsel Saria Tseng reported multiple share dispositions. On May 22, 2026, she completed an open-market sale of 5,000 shares of common stock at $1,586.43 per share, leaving 151,783 shares held directly afterward.
The filing also reports a bona fide gift transfer of 200 shares from her direct holdings to an individual who is not an immediate family member sharing the same household. The footnote states no funds were exchanged, no sale occurred, and she no longer retains any pecuniary interest in those shares.
In addition, the filing shows 1,000 shares of common stock held indirectly through the C&T Discovery Foundation.
MPWR submitted a Form 144 notice reporting proposed sales of Common Stock by insiders. The filing lists transaction dates of 05/18/2026, 05/22/2026, and an entry dated 05/26/2026, and identifies Robert Dean in connection with a common-stock entry.
MPWR submitted a Rule 144 notice listing resale of Common stock that originated as restricted stock dated 02/07/2013. The filing shows two reported dispositions by Jeff Zhou: 1,014 shares on 05/05/2026 and 500 shares on 05/06/2026, with dollar amounts displayed alongside each sale.