Monolithic Power SEC Filings

Monolithic Power Systems (MPWR) Form 4 reports multiple open-market sales by EVP and CFO Theodore Blegen executed on 10/01/2025 under a Rule 10b5-1 trading plan adopted 02/26/2025. The schedule shows a sequence of sales at weighted-average prices ranging from $902.61 to $917.17 per share across separate blocks, reducing Mr. Blegen's direct holdings from earlier reported balances down to 37,940 shares held directly. The filing also discloses indirect ownership of 5,331 shares in an irrevocable trust for Theodore F. Blegen and 5,331 shares in an irrevocable trust for Sarah N. Blegen. The form is signed by an attorney-in-fact.

Form 144 filing for MPWR (Monolithic Power Systems Inc.): The notice reports a proposed sale of 3,000 common shares to be executed through Morgan Stanley Smith Barney LLC on 10/01/2025 on NASDAQ, with an aggregate market value of $2,739,643.80. The shares were acquired as performance shares from the issuer on 07/20/2023 and paid for on that date. The filing lists 47,892,000 shares outstanding for the class. The filer, identified in sale history as Bernie Blegen, sold 3,000, 3,000, and 6,000 common shares on 09/02/2025, 08/01/2025, and 07/01/2025 respectively, generating gross proceeds of $2,443,025.70, $2,250,000.00, and $4,500,000.00.

Monolithic Power Systems (MPWR) director Carintia Martinez reported a sale of common stock under a 10b5-1 plan. On 09/18/2025 the reporting person sold 1,400 shares of Monolithic Power Systems common stock for a price reported as $900. After the sale the reporting person beneficially owned 878 shares. The filing states the transaction was executed pursuant to a Rule 10b5-1 trading plan adopted on 11/27/2024 and the Form 4 was signed by an attorney-in-fact on 09/18/2025.

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.

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.