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.
Michael Hsing filed a notice of proposed sale under Rule 144 covering 33,000 shares of Common Stock of MPWR through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of 38,670,192.00.
The shares to be sold were acquired as performance shares from the issuer on 02/03/2026 and 10/25/2025, totaling 14,902 and 18,098 shares. Common shares outstanding were 47,907,000. During the past three months, Hsing sold 33,000, 34,000, and 54,923 common shares for gross proceeds of 39,234,171.90, 38,837,373.80, and 64,323,823.90, respectively.
Monolithic Power Systems CEO Michael Hsing, who also serves as a director, sold a total of 34,000 shares of common stock on February 10, 2026 in a series of open-market transactions under a pre-arranged Rule 10b5-1 trading plan adopted on August 28, 2025. The reported weighted average sale prices on that date ranged from about $1,128.88 to $1,197.26 per share. Following these sales, Hsing directly owns 954,234 shares and indirectly holds 133,040 shares through the M Hsing 04 Trust and 12,825 shares through the ZH Family 2020 Trust.
Monolithic Power Systems director Victor K. Lee sold shares in a planned trade. On 02/09/2026, he executed an open‑market sale of 400 shares of common stock at $1,212.16 per share, and held 27,756 shares afterward. The sale was made under a pre‑arranged Rule 10b5‑1 trading plan adopted on 08/25/2025.
Monolithic Power Systems insider Michael Hsing filed a notice to sell 33,000 shares of MPWR common stock under Rule 144. The shares were acquired on 02/03/2026 as performance shares from the issuer and are to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.
The planned sale has an aggregate market value of $39,234,171.90, based on 47,907,000 shares of common stock outstanding. Over the prior three months, Hsing reported additional MPWR common stock sales totaling 34,000 shares on 02/10/2026, 54,923 shares on 02/06/2026, and 30,000 shares on 11/12/2025.
Monolithic Power Systems executive Deming Xiao reported a tax-related stock sale. As EVP, Global Operations, he sold 22,875 shares of common stock on February 6, 2026 at an average price of $1,171.1637 per share.
According to the filing, the sale was made to cover taxes due upon the release of restricted stock units under the company’s equity incentive plan. After this transaction, Xiao directly held 235,932 shares, with additional indirect holdings of 20,455 shares owned by his spouse and 4,336 shares held by the Christopher Chao Xiao Trust.
Monolithic Power Systems executive Saria Tseng reported selling 22,875 shares of common stock on February 6, 2026, at an average price of $1,171.1637 per share. The filing states these sales were made to cover taxes upon the release of restricted stock units under the company’s equity incentive plan.
After this transaction, Tseng beneficially owned 200,626 shares of Monolithic Power Systems common stock directly and 1,000 shares indirectly through C&T Discovery Foundation, according to the report.
Monolithic Power Systems executive Maurice Sciammas, EVP, WW Sales & Marketing, reported selling 22,875 shares of common stock on 02/06/2026 at $1,171.1637 per share. The sale, coded "S", was made to cover taxes due upon the release of restricted stock units, as required by the company’s equity incentive plan.
Following this tax-related sale, he directly holds 178,625 common shares and also has additional indirect holdings through various family trusts and brokerage accounts.
Monolithic Power Systems EVP and CFO Theodore Blegen sold 21,725 shares of common stock on February 6, 2026. The shares were sold at an average price of $1,171.1637 per share to cover taxes upon the release of restricted stock units under the company’s equity incentive plan.
After the sale, Blegen directly owned 82,353 shares of common stock and had indirect beneficial ownership of 5,331 shares in an irrevocable trust for Sarah N. Blegen and 5,331 shares in an irrevocable trust for Theodore F. Blegen.
Monolithic Power Systems CEO Michael Hsing reported a tax-related share sale. On 02/06/2026, he sold 54,923 shares of common stock at $1,171.1637 per share to cover taxes due upon the release of restricted stock units under the company’s equity incentive plan.
After this transaction, he held 988,234 shares directly. Additional indirect holdings were reported as 133,040 shares held by the M Hsing 04 Trust and 12,825 shares held by the ZH Family 2020 Trust.
Michael Hsing has filed a notice of proposed sale of 34,000 shares of common stock of MPWR, with an aggregate market value of 38,837,373.80. The shares are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services on the NASDAQ, with an approximate sale date of 02/10/2026.
The 34,000 shares were acquired as performance shares from the issuer on 02/03/2026. Over the past three months, Michael Hsing has sold additional common shares, including 54,923 shares on 02/06/2026 for gross proceeds of 64,323,823.90, and other sales on 11/12/2025 and 11/11/2025.