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.
Saria Tseng, EVP & General Counsel of Monolithic Power Systems, reported a sale of 14,510 shares of the company's common stock on 09/18/2025 at a price of $914.45 per share. The filing notes the sale was made pursuant to a Rule 10b5-1 trading plan adopted on 08/30/2024. After the reported transaction, the filing shows beneficial ownership of 144,494 shares, which includes 27 shares acquired through the company's qualified ESPP on 02/17/2025. The form is signed by the reporting person and discloses the relationship to the issuer as an officer.
Form 144 notice from Monolithic Power Systems, Inc. (MPWR) discloses a proposed sale of 14,510 common shares through Morgan Stanley Smith Barney LLC on 09/18/2025 on the NASDAQ with an aggregate market value of $13,268,669.50. The shares were acquired as performance shares from the issuer on 07/20/2023 and the filing reports no securities sold in the past three months by the selling person. The filer attests they are not aware of undisclosed material adverse information and the notice includes the standard signatures and Rule 10b5-1 plan disclosure fields.
Monolithic Power Systems (MPWR) submitted a Form 144 notifying a proposed insider sale of common stock. The notice lists 1,400 shares to be sold through Morgan Stanley Smith Barney LLC on 09/18/2025, with an aggregate market value of $1,260,000 and 47,892,000 shares outstanding. The filing details the acquisition history for those shares as restricted stock received from the issuer on 02/08/2023 (542 shares), 05/27/2023 (291 shares), 05/27/2022 (292 shares), and 02/07/2024 (275 shares), with payment noted as not applicable. The filer reports nothing to report for securities sold in the past three months and includes the standard representation regarding material nonpublic information.
Monolithic Power Systems, Inc. declared a third quarter cash dividend of $1.56 per share. The dividend will be paid on October 15, 2025 to stockholders of record as of the close of business on September 30, 2025. The company disclosed this dividend in connection with a press release, which is included as an exhibit.
Theodore Blegen, EVP and CFO of Monolithic Power Systems (MPWR), reported multiple sales of common stock on 09/02/2025 under a Rule 10b5-1 trading plan adopted 02/26/2025. The Form 4 lists a series of dispositions at prices ranging roughly from $803.43 to $822.59, with weighted-average prices disclosed for several grouped lines. The reported transactions total 3,000 shares sold across multiple sale lots. Following these transactions the filing shows 40,939 shares held directly and two indirect holdings of 5,331 shares each in irrevocable trusts. The form was signed by an attorney-in-fact on behalf of Mr. Blegen.
Monolithic Power Systems (MPWR) director Eugen J. Elmiger reported multiple open-market sales of common stock on 08/29/2025. The Form 4 lists six sale transactions totaling 4,000 shares executed at weighted-average prices ranging roughly from $844.00 to $849.41. After the reported sales the filing shows the reporting person beneficially owned 17,213 shares. The transactions were signed by an attorney-in-fact and the filing includes explanations that each line reflects a weighted-average sale price with price ranges available on request.
Form 144 filing for Monolithic Power Systems, Inc. (MPWR) states that an insider intends to sell 3,000 shares of common stock through Morgan Stanley Smith Barney on 09/02/2025, with an aggregate market value reported as $2,443,025.70. The 3,000 shares match performance awards acquired in 2023 (dates: 05/07/2023, 06/30/2023, 07/20/2023 totaling 3,000 shares). The filer also reported prior sales by the same person of 6,000 shares on 07/01/2025 for $4,500,000.00 and 3,000 shares on 08/01/2025 for $2,250,000.00. The notice includes the signature representation that the seller is not aware of undisclosed material adverse information about the issuer.
Form 144 filing for Monolithic Power Systems, Inc. (MPWR). The notice reports a proposed sale of 4,000 shares of Common Stock on the NASDAQ with an aggregate market value of $3,386,844.86 and approximately 47,904,694 shares outstanding. The proposed approximate sale date is 08/29/2025, and the broker listed is Luzerner Kantonalbank AG, Pilatusstrasse 12, Luzern. The securities to be sold were acquired as Restricted Stock Units from the issuer on 10/23/2013 (2,500 shares) and 10/23/2014 (1,500 shares). The filer reports no securities sold by the person in the past three months. The filing includes the standard seller representation regarding material nonpublic information and a signature/attestation statement.
Jeff Zhou, a director of Monolithic Power Systems, Inc. (MPWR), reported an open-market sale of company stock. On 08/27/2025 he disposed of 193 shares at a reported price of $870 per share, and after the transaction he directly beneficially owned 5,611 shares. The Form 4 indicates the filing was submitted by one reporting person and signed by an attorney-in-fact on behalf of Mr. Zhou.
Form 144 filing for Monolithic Power Systems (MPWR) reports a proposed sale of 193 common shares through Morgan Stanley Smith Barney LLC on 08/27/2025. The filer discloses three prior restricted-stock acquisitions (48 shares on 02/12/2021; 133 shares on 02/02/2022; 12 shares on 02/08/2023) and two recent open-market sales by the same person: 400 shares sold 08/13/2025 for $340,000 and 200 shares sold 08/12/2025 for $166,000. The filing includes the broker, share counts, aggregate market value for the proposed sale ($167,910), and the statement that the filer is not aware of undisclosed material adverse information.