MONOLITHIC POWER SYSTEMS, INC. (MPWR) Insider Trading & SEC Filings
Last SEC filing
MONOLITHIC POWER SYSTEMS, INC. (MPWR) has filed 19 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-28. Insider sales over the same period: 64 transactions worth $191.70M. 2 Form 8-K material event filings were reported by MPWR in the last 90 days. 13 Form 144 notices of proposed sale were filed for MPWR stock. InsiderAlpha tracks every MPWR SEC filing - Form 4, Form 144, and 8-K - in real time, including Rule 10b5-1 plan detection.
About MONOLITHIC POWER SYSTEMS, INC. (MPWR)
MONOLITHIC POWER SYSTEMS, INC. trades under the ticker MPWR. InsiderAlpha tracks 99 primary SEC Form 4 filings from 12 reporting insiders for MPWR since 2024, sourced directly from SEC EDGAR.
| Sector | Information Technology insider trading |
|---|---|
| SIC classification | Semiconductors & Related Devices (SIC 3674) |
| SEC CIK | 0001280452 |
90-Day SEC Filing Activity
| Insider sales (90d) | 64 ($191.70M) |
|---|---|
| Form 4 filings (90d) | 19 |
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 13 |
| Latest Form 4 filing | 2026-07-28 |
Recent MPWR Insider Transactions (Form 4)
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Robert W. Dean II | Interim CFO | A - Grant or award | 1.4K | $0.00 | - | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 410 | $1,384.11 | $567K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 1.9K | $1,344.16 | $2.51M | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 240 | $1,369.18 | $329K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 1.5K | $1,339.59 | $1.96M | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 776 | $1,334.59 | $1.04M | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 472 | $1,375.47 | $649K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 1.5K | $1,348.91 | $2.03M | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 50 | $1,359.36 | $68K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 5.6K | $1,352.95 | $7.63M | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 274 | $1,318.42 | $361K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 527 | $1,314.03 | $692K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 409 | $1,323.93 | $541K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 464 | $1,329.30 | $617K | SEC | |
| Maurice Sciammas | EVP, WW Sales & Marketing | S - Open-market sale [10b5-1] | 418 | $1,378.73 | $576K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for MONOLITHIC POWER SYSTEMS, INC. (MPWR). Updated in real time as new filings are submitted to the SEC.
Most-Active MPWR Insiders - Last 90 Days
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Maurice Sciammas | 32 | $39.12M |
| Michael Hsing | 13 | $59.31M |
| Eugen J. Elmiger | 9 | $19.02M |
| Robert W. Dean II | 4 | $43K |
| Deming Xiao | 4 | $49.64M |
Recent MPWR Form 8-K Material Events
- - Item 2.02, 9.01 [SEC]
- - Item 5.07, 8.01, 9.01 [SEC]
- - Item 4.02 · Earnings · negative [SEC]
Monolithic Power Systems announced on February 26, 2026 that it must restate its audited 2024 annual financial statements and all 2025 quarterly financial statements due to an unintentional accounting error. The error is non-cash in nature and does not affect key operational metr
Recent MPWR Form 144 Notices of Proposed Sale
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
Recent Insider Filings
- - Robert W. Dean II (Interim CFO)
- - Maurice Sciammas (EVP, WW Sales & Marketing)
- - Maurice Sciammas (EVP, WW Sales & Marketing)
- - Maurice Sciammas (EVP, WW Sales & Marketing)
- - Maurice Sciammas (EVP, WW Sales & Marketing)
Form 4 Transaction Code Reference
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in MPWR insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
MPWR Insider Trading - FAQ
- What is the latest insider trade for MPWR?
- MONOLITHIC POWER SYSTEMS, INC. (MPWR) had 19 insider filings in the last 90 days, with the most recent on 2026-07-28. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
- How many insiders are buying MPWR stock?
- 0 insider purchases of MPWR were filed in the last 90 days.
- How many insiders are selling MPWR stock?
- 64 insider sales of MPWR were filed in the last 90 days, totaling $191.70M.
- Where can I see MPWR SEC filings (Form 4, 10-K, 10-Q, 8-K)?
- This page tracks MPWR Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Learn More
- What is SEC Form 4?
- How to read insider buying signals
- Rule 10b5-1 trading plans explained
- The cluster buying signal
Open the live MPWR dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.