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.
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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.
Monolithic Power Systems Inc. (MPWR) director transaction reported. A company director reported the sale of 100 shares of Monolithic Power Systems common stock in an open market transaction. The sale took place at a price of $896.97 per share. After this transaction, the director reports beneficial ownership of 426 shares held directly.
Monolithic Power Systems (MPWR) executive Maurice Sciammas, EVP of Worldwide Sales & Marketing, reported a stock sale in a Form 4 filing. On 11/24/2025, he sold 3,976 shares of MPWR common stock at a price of $895.23 per share, coded as a sale transaction. After this trade, he directly owns 144,330 shares of common stock and also reports additional indirect holdings through multiple family trusts and related accounts, reflecting ongoing significant ownership in the company.
Monolithic Power Systems (MPWR) director reports small stock sale. A company director filed a Form 4 showing the sale of 100 shares of MPWR common stock on 11/21/2025 at a price of $873.97 per share, coded as a sale transaction ("S").
Following this trade, the director beneficially owns 526 shares of MPWR common stock in direct ownership. The filing is made by a single reporting person in the capacity of director and does not report any derivative securities activity.
Monolithic Power Systems, Inc. updated its corporate bylaws to make it easier for investors to call a special shareholder meeting. On November 19, 2025, the Board approved Amended and Restated Bylaws that lower the ownership threshold required to request a special meeting from at least 30% to at least 25% of the company’s outstanding voting capital stock.
The Board explains that it considered the 2025 annual meeting, where stockholders approved a non-binding proposal to set the threshold at 10%, along with feedback from a majority in interest of its top ten stockholders, who preferred a significantly higher threshold than 10%, and a review of peer practices. The full amended bylaws are filed as an exhibit and are effective immediately.
Monolithic Power Systems (MPWR) reported insider activity by its EVP, WW Sales & Marketing, in a Form 4 filing. On 11/19/2025, the executive sold multiple blocks of common stock in open market transactions coded "S" for sales.
The reported trades covered relatively small share blocks at weighted average prices ranging from about $875.26 to $886.01, with detailed price ranges provided for each group of sales. After these transactions, the reporting person directly held 148,306 shares of MPWR common stock.
The filing also lists additional indirect beneficial ownership in various family trusts and related accounts, each holding smaller amounts of MPWR shares. The trades were reported as having been made under a Rule 10b5-1 trading arrangement, which is a pre-established plan for buying or selling stock.