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.
Shareholder Bernie Blegen filed a Rule 144 notice to sell 20,730 shares of common stock through Morgan Stanley Smith Barney LLC around February 4, 2026 on NASDAQ, with an aggregate market value of $24,146,925.90 and 48,710,953 shares outstanding.
The 20,730 shares were acquired on February 3, 2026 as performance-based restricted stock units from the issuer. Over the past three months, Blegen sold three blocks of 3,000 common shares each, with gross proceeds between $2,724,630.00 and $3,389,280.00.
Monolithic Power Systems insider Maurice Sciammas has filed a notice of intent to sell common stock under SEC Rule 144. The filing covers 21,590 shares of common stock, with an aggregate market value of 25,148,679.70, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.
The 21,590 shares were acquired on 02/03/2026 as performance-based restricted stock units from the issuer. As context, the filing lists 48,710,953 shares of common stock outstanding and notes prior sales by Sciammas in the last three months totaling 38,976 shares of common stock for gross proceeds of 34,337,784.48.
This Form 144 notice relates to a planned sale of up to 21,590 shares of common stock through Morgan Stanley Smith Barney LLC on the NASDAQ, with an indicated aggregate market value of $25,148,679.70. The issuer has 48,710,953 shares outstanding.
The seller, Saria Tseng, acquired these 21,590 shares on February 3, 2026 as performance-based restricted stock units from the issuer. Over the prior three months, the filing lists additional sales by Saria Tseng totaling 40,000 shares of common stock on November 25 and 26, 2025, with gross proceeds of $18,083,600.00 and $18,529,300.00, respectively.
A holder of MPWR common stock filed a notice of proposed sale of 21,590 shares under Rule 144. These shares have an aggregate market value of $25,148,679.70 and are to be sold through Morgan Stanley Smith Barney LLC on 02/04/2026 on the NASDAQ market.
The issuer had 48,710,953 shares of this class outstanding. The seller acquired the 21,590 shares on 02/03/2026 as performance-based restricted stock units from the issuer, with no separate cash payment noted.
Monolithic Power Systems executive vice president and CFO Theodore Blegen reported multiple open‑market sales of common stock on February 2, 2026 under a pre‑arranged Rule 10b5‑1 trading plan. The trades involved small blocks of shares at weighted average prices ranging roughly from $1,110.14 to $1,139.54 per share. After these transactions, Blegen directly beneficially owned 65,333 common shares and indirectly held 5,331 shares in each of two irrevocable trusts for Sarah N. Blegen and Theodore F. Blegen.
Monolithic Power Systems investor notice: A holder named Bernie Blegen has filed to sell 3,000 shares of MPWR common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of 3,389,269.80. The filing states that 47,907,000 shares of common stock were outstanding.
The 3,000 shares to be sold were acquired as performance shares from the issuer on 01/01/2024. The notice also lists prior sales over the past three months, including three separate 3,000‑share transactions with gross proceeds of 2,724,621.30, 3,073,277.40, and 2,821,403.10.
BlackRock, Inc. has filed an amended Schedule 13G reporting beneficial ownership of 4,899,383 shares of Monolithic Power Systems, Inc. common stock, representing 10.2% of the class as of 12/31/2025. BlackRock reports sole voting power over 4,567,525 shares and sole dispositive power over all 4,899,383 shares, with no shared voting or dispositive power.
BlackRock states that the shares are held by certain of its business units in the ordinary course of business and not for the purpose of changing or influencing control of Monolithic Power Systems. Various underlying clients have rights to dividends or sale proceeds, but no single client holds more than five percent of the outstanding common shares.
Monolithic Power Systems executive Theodore Blegen, EVP and CFO, reported planned stock sales under a Rule 10b5-1 trading plan. On January 2, 2026, he sold multiple small blocks of Monolithic Power Systems common stock at prices between $927.61 and $946.62 per share, as disclosed across several transaction lines. These trades were executed pursuant to a Rule 10b5-1 plan adopted on February 26, 2025, which allows pre-arranged sales according to preset instructions.
Following these transactions, Blegen directly held 68,332 shares of common stock. The filing also shows indirect beneficial ownership of 5,331 shares held in an irrevocable trust for Sarah N. Blegen and another 5,331 shares held in an irrevocable trust for Theodore F. Blegen, reflecting additional trust-related holdings associated with the reporting person.
Monolithic Power Systems, Inc. announced a fourth quarter cash dividend of $1.56 per share for its common stock. The dividend will be paid to stockholders on January 15, 2026 to all stockholders of record as of the close of business on December 31, 2025.
The company disclosed this dividend decision in a current report and attached the related press release as an exhibit, confirming its continued practice of returning cash to shareholders through regular dividends.
Monolithic Power Systems CEO and director Michael R. Hsing transferred 12,337 shares of common stock as a gift to a 501(c)(3) foundation on 12/09/2025. The company states that after the transfer he has no management or investment control and no pecuniary interest in those shares, and no funds were exchanged, so no sale occurred.
Following the transaction, Hsing beneficially owned 906,332 shares directly, plus 133,040 shares held indirectly through the M Hsing 04 Trust and 12,825 shares held indirectly through the ZH Family 2020 Trust.