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) 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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