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.
The Monolithic Power Systems, Inc. (MPS) (Nasdaq: MPWR) SEC filings page provides access to the company’s regulatory disclosures as filed with the U.S. Securities and Exchange Commission. MPS is a fabless global semiconductor company that provides high-performance, semiconductor-based power electronics solutions, and its filings offer detailed insight into its financial condition, governance, and material events.
Investors researching MPWR can review current reports on Form 8-K that MPS files to announce significant developments. Recent 8-K filings have covered topics such as quarterly financial results, the furnishing of earnings press releases and commentary, and the declaration of cash dividends on common stock. These filings often attach press releases as exhibits, providing the full text of earnings announcements and dividend details.
Other 8-K filings document corporate governance changes, including amendments to the company’s bylaws. For example, MPS has reported an amendment that reduced the ownership threshold required for stockholders to call a special meeting, and explained the Board’s considerations in making that change.
Through its SEC reports, MPS also discloses information about its operations and structure, such as its status as a fabless company and the fact that it has operations in multiple locations in the United States, Europe, and Asia without maintaining a single headquarters location. Addresses included in filings are noted as being provided to satisfy SEC requirements.
On this page, Stock Titan surfaces MPS filings as they become available from EDGAR and applies AI-powered summaries to help explain the key points of lengthy documents. Users can quickly understand the main elements of earnings-related 8-Ks, dividend announcements, and governance updates, and then drill down into the full text when more detail is needed.
Whether you are looking for MPWR’s latest results of operations, information on cash dividends, or changes to its corporate bylaws, this SEC filings page offers a structured view of Monolithic Power Systems, Inc.’s regulatory disclosures, supported by AI-generated highlights for faster analysis.
Monolithic Power Systems director Jeff Zhou reported a sale of 400 shares of the company's common stock on 08/13/2025 at a price of $850 per share. After the reported transaction, Mr. Zhou beneficially owned 5,804 shares. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Zhou.
Jeff Zhou, a director of Monolithic Power Systems, Inc. (MPWR), reported a transaction on 08/12/2025. The Form 4 shows a Transaction Code: S on common stock with a reported quantity of 200 shares and a price listed as $830. Following the reported transaction the filing shows 6,204 shares beneficially owned in a direct form. The form was signed by attorney-in-fact Saria Tseng on 08/12/2025.
Monolithic Power Systems (MPWR) Form 144 shows a planned sale of 400 common shares through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of $340,000. The filing reports 47,892,000 shares outstanding, so the 400-share sale represents roughly 0.0008% of the companys outstanding stock.
The securities to be sold were acquired as restricted stock on 02/07/2024 (270 shares) and 02/08/2023 (130 shares). The notice also lists a prior sale by JEFF ZHOU of 200 shares on 08/12/2025 for gross proceeds of $166,000. The document includes the standard representation that the seller is not aware of undisclosed material adverse information about the issuer.
Monolithic Power Systems, Inc. (MPWR) filed a Form 144 reporting a proposed sale of 200 shares of common stock acquired as restricted stock on 02/07/2024. The filing lists an aggregate market value of $166,000 for the shares and shows 47,892,000 shares outstanding. The sale is to be effected through Morgan Stanley Smith Barney LLC on NASDAQ with an approximate sale date of 08/12/2025. The filer reports no sales in the past three months and makes the required statement that they are not aware of undisclosed material adverse information about the issuer.
Xiao Deming, identified as EVP, Global Operations of Monolithic Power Systems, reported an internal transfer of company common stock on Form 4. The filing shows 945 shares were moved from Mr. Xiao's direct holdings into the Christopher Chao Xiao Trust and the form states explicitly that no funds were exchanged.
Following the reported transaction the Form 4 lists 120,660 shares beneficially owned directly by the reporting person, 4,336 shares beneficially owned indirectly by the Christopher Chao Xiao Trust, and 20,455 shares held indirectly by a spouse.
Transaction overview: On 08/06/2025, Maurice Sciammas, EVP, WW Sales & Marketing of Monolithic Power Systems Inc. (MPWR), filed a Form 4 reporting non‑derivative transactions in MPWR common stock involving intra‑family trust transfers.
The filing reports transfers of 4,836 shares to the Sciammas Family Trust and transfers of 2,000, 1,418 and 1,418 shares from various Sciammas 2022 GRATs and 2022 Trusts for Oski Crew into the Sciammas Family Trust. The filing states no funds were exchanged and no sale occurred for those transfers. The Sciammas Family Trust is reported to beneficially own 44,930 shares following the reported transaction(s); other trusts show beneficial ownership figures of 13,727, 9,481 and 9,481 in the filing.
The form is signed by Saria Tseng as attorney‑in‑fact for Mr. Sciammas on 08/06/2025. No derivative transactions, option exercises or cash sales are reported in this filing.
Monolithic Power Systems (MPWR) – Form 4 insider transaction. EVP Global Operations Deming Xiao reported a single open-market sale on 08/01/2025.
- Shares sold: 39,999 common shares
- Price per share: $780
- Approx. proceeds: ~$31.2 million (39,999 × $780)
- Post-sale direct holding: 121,605 shares
- Indirect holdings: 20,455 shares held by spouse and 3,391 shares held in the Christopher Chao Xiao Trust
The transaction is coded “S” (open-market sale). No derivative activity was reported. After this disposition, Xiao retains a combined 145,451 shares (direct + indirect), indicating continued but reduced exposure. The form notes an additional 27 shares added on 02/17/2025 through the company’s ESPP.
Large executive sales can be perceived as a bearish signal if not offset by offsetting purchases or clear diversification rationale. No Rule 10b5-1 plan box was checked, suggesting the sale was not conducted under a pre-arranged trading plan.
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