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 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.
An affiliated holder of the issuer’s common stock has filed a notice of proposed sale under Rule 144 to sell 200 shares, with an aggregate market value of $240,000, on the NASDAQ around February 10, 2026. The filing states that 47,900,000 shares of this class were outstanding at the time of the notice.
The 200 shares to be sold were received on May 28, 2025 through two GRAT distributions from Maurice Sciammas, originally acquired as 81 shares on May 2, 2018 and 119 shares on May 7, 2014. The seller represents they are not aware of undisclosed material adverse information about the issuer’s operations.
A holder of common stock has filed a Form 144 notice to potentially sell 1,286 shares, with an aggregate market value of $1,505,526.00. The proposed sale is through Morgan Stanley Smith Barney LLC on the NASDAQ, with an approximate sale date of 02/06/2026. These shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The notice also lists prior sales over the past three months by Saria Tseng, including 20,000 shares sold on 11/25/2025, 20,000 on 11/26/2025, and 21,590 on 02/04/2026, with disclosed gross proceeds for each transaction.
An insider has filed a Rule 144 notice to sell 1,286 shares of common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an indicated aggregate market value of 1505526.00 and an approximate sale date of 02/06/2026.
The 1,286 shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The filing also shows that Deming Xiao sold 21,590 common shares on 02/04/2026 for gross proceeds of 25285344.00 during the past three months.
Michael Hsing has filed a notice to sell 3,082 shares of common stock under Rule 144. The planned sale will be executed through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of 3609222.00.
The 3,082 shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. The filing notes that there were 48,710,953 shares of this class outstanding at the time of the notice.
Over the prior three months, the same seller disposed of additional common stock: 40,000 shares for gross proceeds of 38335600.00 on 11/11/2025, 30,000 shares for 28958700.00 on 11/12/2025, and 51,841 shares for 60714106.00 on 02/04/2026. The signer represents they are not aware of undisclosed material adverse information about the issuer.
Monolithic Power Systems (MPWR) shareholder Bernie Blegen filed a Form 144 notice to sell 995 shares of common stock through Morgan Stanley Smith Barney LLC on NASDAQ around 02/06/2026, with an aggregate market value of 1165304.00. The issuer reported 48710953 shares outstanding.
During the prior three months, the same seller reported additional common stock sales: 3000 shares on 12/01/2025 for gross proceeds of 2724630.00, 3000 shares on 01/02/2026 for 2821410.00, 3000 shares on 02/02/2026 for 3389280.00, and 20730 shares on 02/04/2026 for 24278167.00.