Welcome to our dedicated page for Monolithic Power 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 (MPWR) filed a Form 4 showing its EVP and CFO received 87,690 shares of common stock on October 25, 2025. The shares were awarded at $0 upon certification and approval of performance goals tied to market-based RSUs granted on October 25, 2022; all shares fully vested on October 25, 2025.
Following the award, the reporting person beneficially owns 125,630 shares directly. In addition, 5,331 shares are held indirectly in an Irrevocable Trust FBO Theodore F. Blegen and 5,331 shares are held indirectly in an Irrevocable Trust FBO Sarah N. Blegen.
Monolithic Power Systems (MPWR)Michael R. Hsing was awarded 302,920 shares of common stock on October 25, 2025 at $0 per share after the Compensation Committee certified performance for previously granted market-based RSUs.
The MSUs, granted on October 25, 2022, were tied to five stock price targets and relative total stockholder return over a three-year period; all awarded shares fully vested on October 25, 2025.
Following the transaction, Hsing beneficially owned 1,117,587 shares directly, plus 133,040 held indirectly by the M Hsing 04 Trust and 12,825 held indirectly by the ZH Family 2020 Trust.
Monolithic Power Systems (MPWR) executive Deming Xiao, EVP, Global Operations, reported the acquisition of 135,520 shares of common stock on October 25, 2025 at $0 per share. The shares were awarded upon certification of performance for market-based restricted stock units (MSUs) granted on October 25, 2022, tied to five stock price targets and relative total stockholder return over a three-year period; all shares vested on October 25, 2025.
Following the transaction, the filing shows 256,180 shares beneficially owned directly, plus 20,455 shares indirectly by spouse and 4,336 shares indirectly by the Christopher Chao Xiao Trust.
Monolithic Power Systems (MPWR) reported an insider transaction for EVP, WW Sales & Marketing, Maurice Sciammas. On October 25, 2025, the Compensation Committee certified the performance of previously granted market-based RSUs, resulting in an award of 135,520 shares. All awarded shares fully vested on the same date at a reported price of $0.
Following the transaction, Sciammas beneficially owns 237,849 shares directly. The ending balance includes 4 shares acquired on August 15, 2025 through the company’s ESPP. The filing also lists multiple indirect holdings across family trusts and accounts.
Monolithic Power Systems (MPWR) reported an insider transaction by its EVP & General Counsel. On 10/24/2025, the reporting person sold 1,300 shares of common stock at a price of $1,087.62 per share under transaction code “S.” Following the sale, the filer beneficially owned 126,354 shares, held directly. The filing notes the trade was made pursuant to a Rule 10b5-1 trading plan adopted on 8/30/2024.
Monolithic Power Systems (MPWR) executive Saria Tseng, EVP & General Counsel, reported open-market sales of common stock under a Rule 10b5-1 plan. On 10/15/2025, she sold 14,028 shares at $1,016.18. On 10/16/2025, she sold 1,499 shares at $1,021.26 and 1,313 shares at $1,030.81. Following these transactions, her beneficial ownership decreased to 127,654 shares. The trading plan was adopted on 8/30/2024.
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.
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