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.
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.
Maurice Sciammas filed a Rule 144 notice to sell 1286 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an approximate sale date of 02/06/2026. The filing notes 48710953 shares of common stock outstanding.
The 1286 shares to be sold were acquired on 02/03/2026 as performance-based restricted stock units from the issuer, with payment also dated 02/03/2026. Over the past three months, Sciammas previously sold 35000, 3976, and 21590 common shares on 11/19/2025, 11/24/2025, and 02/04/2026 for gross proceeds of 30777350.00, 3559434.48, and 25285344.00.
Monolithic Power Systems director Eileen Wynne reported receiving an annual equity award in the form of restricted stock units. On February 3, 2026, she was granted 189 shares of common stock at a price of $0 per share, as part of the independent directors’ annual RSU grant program.
The RSU grant will vest one year after the grant date, conditioned on her continued service with the company. Following this award, she beneficially owned 1,342 shares of Monolithic Power Systems common stock in direct form.
Monolithic Power Systems director Jeff Zhou received an equity grant of 189 shares of common stock on February 3, 2026. These shares were awarded at a price of $0 per share as part of the company’s annual restricted stock unit grant to each independent director.
The RSU grant will vest one year after the grant date, conditioned on Mr. Zhou’s continued service with the company. Following this grant, he beneficially owns 5,800 shares of Monolithic Power Systems common stock in direct ownership.
Monolithic Power Systems director Herbert Kuo Wei Chang received an annual equity award in the form of restricted stock units. On February 3, 2026, he was granted 189 shares of common stock at a price of $0 per share, bringing his directly held total to 615 shares.
The award represents the company’s routine annual restricted stock unit grant to each independent director. These RSUs will vest one year after the grant date, as long as Chang continues to serve on the Board of Directors during that period.
Monolithic Power Systems director Eugen J. Elmiger reported an equity award from the company. On February 3, 2026, he acquired 189 shares of common stock at a stated price of $0, reflecting an annual restricted stock unit grant to each independent director.
After this grant, Elmiger directly owned 17,402 shares of Monolithic Power Systems common stock. The RSU grant will vest one year after the grant date, provided he continues to serve the company as an independent director.