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Planned insider sales
Notices (SEC Form 144) that executives and other insiders file before selling shares, and whether a sale was reported afterwards.
About this data
- What it is
- Before an executive, director or large owner sells restricted or control shares, they file a short notice with the SEC, called Form 144, saying how many shares they plan to sell, through which broker and roughly when. This feed lists those notices, and for each one shows whether a sale was reported afterwards on a Form 4 and how many days later.
- Who files it
- The person selling, or their broker, on the day the sale is placed. Electronic notices start in April 2023.
- How current
- We collect new notices throughout the day on SEC business days.
- Terms
- Form 144The notice an insider or other affiliate of a company files with the SEC before selling restricted or control shares, so the shares can be sold under Rule 144. The notice says how many shares, through which broker, and roughly when.10b5-1 planA Rule 10b5-1 trading plan lets an insider set up future sales in advance, on a schedule or at set prices, at a time when they do not hold inside information. A notice that gives a plan adoption date says the sale is made under such a plan.
- Worth knowing
- A notice is a plan, not a sale: the person may sell fewer shares, later, or not at all. The value is the one the filer typed, at a price they chose, not what the shares sell for. Many sales are routine, made to diversify or pay taxes, or under a 10b5-1 plan set up months earlier. A blank in the last column does not mean no sale: the person may not have to file a Form 4 (an ordinary affiliate does not), the sale may be recent, or the Form 4 may name a different spelling of the person. We match by the filer's number first and by name second. Information, not investment advice.
All of this comes from public filings.
Source and freshness · Information, not investment advice (disclaimer).
Form 144 notices per day, last 30 days
All notices Notices that give a 10b5-1 plan
By the day each notice was filed. A notice is a plan to sell, not a sale.
Latest notices of planned insider sales
Showing: ticker MPWR
| Filed | Insider | Company | Shares to sellA notice is a plan, not a sale. The person may sell fewer shares, sell later, or not sell at all, and the number of shares is what they expect to sell on the day they file. | ValueThe aggregate market value the filer typed on the notice: the shares times a price the filer chose. It is not what the shares will sell for. | PlanA Rule 10b5-1 trading plan lets an insider set up future sales in advance, on a schedule or at set prices, at a time when they do not hold inside information. A notice that gives a plan adoption date says the sale is made under such a plan. | Expected sale | Sale reportedInsiders who are officers, directors or hold more than 10% report their sales on a Form 4, within two business days. We look for the first Form 4 with an open-market sale by the same person in the same company within 90 days of the notice, and show how many days after the notice it was filed. A blank means we found none: the person may not have sold, may not have to file a Form 4, or the Form 4 may be one we do not have. | Notice |
|---|---|---|---|---|---|---|---|---|
| Nov 13, 2026 | Eugen J. Elmiger Director | MPWR Monolithic Power Systems, Inc. | 2,500 | $3.5M | — | Nov 13, 2026 | — | Form 144 ↗ |
| Sep 28, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 30,000 | $40.3M | 10b5-1 | Sep 28, 2026 | Form 4 ↗ 2 days later · 30,000 shares | Form 144 ↗ |
| Aug 24, 2026 | Robert W. Dean II Officer | MPWR Monolithic Power Systems, Inc. | 32 | $41.5K | — | Aug 24, 2026 | Form 4 ↗ 2 days later · 32 shares | Form 144 ↗ |
| Aug 17, 2026 | Robert W. Dean II Officer | MPWR Monolithic Power Systems, Inc. | 6 | $8,128 | — | Aug 17, 2026 | Form 4 ↗ 2 days later · 6 shares | Form 144 ↗ |
| Aug 11, 2026 | Kuo Wei Chang Director | MPWR Monolithic Power Systems, Inc. | 100 | $142.0K | — | Aug 11, 2026 | Form 4 ↗ 2 days later · 50 shares | Form 144 ↗ |
| Aug 5, 2026 | Robert Dean Officer | MPWR Monolithic Power Systems, Inc. | 105 | $141.1K | — | Aug 5, 2026 | Form 4 ↗ 1 day later · 105 shares | Form 144 ↗ |
| Jul 15, 2026 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 15,000 | $20.2M | 10b5-1 | Jul 15, 2026 | Form 4 ↗ 2 days later · 15,000 shares | Form 144 ↗ |
| Jun 1, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,001 | $4.6M | 10b5-1 | Jun 1, 2026 | — | Form 144 ↗ |
| May 28, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 7,565 | $12.9M | — | May 27, 2026 | Form 4 ↗ 1 day later · 7,565 shares | Form 144 ↗ |
| May 26, 2026 | Jeff Zhou Director | MPWR Monolithic Power Systems, Inc. | 486 | $816.5K | — | May 26, 2026 | Form 4 ↗ 1 day later · 486 shares | Form 144 ↗ |
| May 26, 2026 | Robert W. Dean II Officer | MPWR Monolithic Power Systems, Inc. | 22 | $35.9K | — | May 26, 2026 | Form 4 ↗ 2 days later · 22 shares | Form 144 ↗ |
| May 22, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 5,000 | $7.9M | — | May 22, 2026 | Form 4 ↗ 5 days later · 5,000 shares | Form 144 ↗ |
| May 18, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 40,000 | $59.3M | — | May 18, 2026 | Form 4 ↗ 2 days later · 40,000 shares | Form 144 ↗ |
| May 18, 2026 | Robert W. Dean II Officer | MPWR Monolithic Power Systems, Inc. | 4 | $6,253 | — | May 18, 2026 | Form 4 ↗ 2 days later · 4 shares | Form 144 ↗ |
| May 15, 2026 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 12,000 | $18.7M | 10b5-1 | May 15, 2026 | Form 4 ↗ 4 days later · 12,000 shares | Form 144 ↗ |
| May 6, 2026 | Deming Xiao Officer | MPWR Monolithic Power Systems, Inc. | 30,000 | $49.6M | — | May 6, 2026 | Form 4 ↗ 2 days later · 30,000 shares | Form 144 ↗ |
| May 6, 2026 | Jeff Zhou Director | MPWR Monolithic Power Systems, Inc. | 500 | $825.0K | — | May 6, 2026 | Form 4 ↗ same day · 1,514 shares | Form 144 ↗ |
| May 6, 2026 | Eileen Wynne Director | MPWR Monolithic Power Systems, Inc. | 335 | $530.2K | — | May 6, 2026 | Form 4 ↗ 2 days later · 335 shares | Form 144 ↗ |
| May 6, 2026 | Eugen J. Elmiger Director | MPWR Monolithic Power Systems, Inc. | 12,000 | $19.8M | — | May 7, 2026 | Form 4 ↗ 2 days later · 12,000 shares | Form 144 ↗ |
| May 5, 2026 | Rosalind Sciammas Member of immediate family of any of th… | MPWR Monolithic Power Systems, Inc. | 400 | $600.0K | — | May 5, 2026 | Form 4 ↗ 1 day later · 380 shares | Form 144 ↗ |
| May 5, 2026 | Jeff Zhou Director | MPWR Monolithic Power Systems, Inc. | 1,014 | $1.6M | — | May 5, 2026 | Form 4 ↗ 1 day later · 1,514 shares | Form 144 ↗ |
| May 1, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $4.6M | 10b5-1 | May 1, 2026 | — | Form 144 ↗ |
| Apr 8, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 8,964 | $11.7M | 10b5-1 | Apr 8, 2026 | Form 4 ↗ 2 days later · 8,963 shares | Form 144 ↗ |
| Apr 6, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 7,636 | $8.9M | 10b5-1 | Apr 6, 2026 | Form 4 ↗ 2 days later · 7,636 shares | Form 144 ↗ |
| Apr 1, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 1,400 | $1.6M | 10b5-1 | Apr 1, 2026 | Form 4 ↗ 2 days later · 1,400 shares | Form 144 ↗ |
| Apr 1, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $3.3M | 10b5-1 | Apr 1, 2026 | — | Form 144 ↗ |
| Mar 30, 2026 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 25,674 | $25.9M | 10b5-1 | Mar 30, 2026 | Form 4 ↗ 2 days later · 25,674 shares | Form 144 ↗ |
| Mar 20, 2026 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 120 | $131.3K | 10b5-1 | Mar 20, 2026 | Form 4 ↗ 4 days later · 30 shares | Form 144 ↗ |
| Mar 2, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $3.3M | 10b5-1 | Mar 2, 2026 | — | Form 144 ↗ |
| Feb 12, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 33,000 | $38.7M | 10b5-1 | Feb 12, 2026 | Form 4 ↗ 5 days later · 33,000 shares | Form 144 ↗ |
| Feb 11, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 33,000 | $39.2M | 10b5-1 | Feb 11, 2026 | Form 4 ↗ 2 days later · 33,000 shares | Form 144 ↗ |
| Feb 10, 2026 | The Sciammas Trust DTD 06/08/2018 Member of immediate family of any of th… | MPWR Monolithic Power Systems, Inc. | 200 | $240.0K | — | Feb 10, 2026 | Form 4 ↗ 2 days later · 200 shares | Form 144 ↗ |
| Feb 10, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 34,000 | $38.8M | 10b5-1 | Feb 10, 2026 | Form 4 ↗ 2 days later · 34,000 shares | Form 144 ↗ |
| Feb 6, 2026 | Theodore Blegen Officer | MPWR Monolithic Power Systems, Inc. | 995 | $1.2M | — | Feb 6, 2026 | Form 4 ↗ 4 days later · 21,725 shares | Form 144 ↗ |
| Feb 6, 2026 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 1,286 | $1.5M | — | Feb 6, 2026 | Form 4 ↗ 4 days later · 22,875 shares | Form 144 ↗ |
| Feb 6, 2026 | Tseng Saria Officer | MPWR Monolithic Power Systems, Inc. | 1,286 | $1.5M | — | Feb 6, 2026 | Form 4 ↗ 4 days later · 22,875 shares | Form 144 ↗ |
| Feb 6, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 3,082 | $3.6M | — | Feb 6, 2026 | Form 4 ↗ 4 days later · 54,923 shares | Form 144 ↗ |
| Feb 6, 2026 | Xiao Deming Officer | MPWR Monolithic Power Systems, Inc. | 1,286 | $1.5M | — | Feb 6, 2026 | Form 4 ↗ 4 days later · 22,875 shares | Form 144 ↗ |
| Feb 4, 2026 | Theodore Blegen Officer | MPWR Monolithic Power Systems, Inc. | 20,730 | $24.1M | — | Feb 4, 2026 | Form 4 ↗ 6 days later · 21,725 shares | Form 144 ↗ |
| Feb 4, 2026 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 21,590 | $25.1M | — | Feb 4, 2026 | Form 4 ↗ 6 days later · 22,875 shares | Form 144 ↗ |
| Feb 4, 2026 | Tseng Saria Officer | MPWR Monolithic Power Systems, Inc. | 21,590 | $25.1M | — | Feb 4, 2026 | Form 4 ↗ 6 days later · 22,875 shares | Form 144 ↗ |
| Feb 4, 2026 | Michael Hsing Officer, Director | MPWR Monolithic Power Systems, Inc. | 51,841 | $60.4M | — | Feb 4, 2026 | Form 4 ↗ 6 days later · 54,923 shares | Form 144 ↗ |
| Feb 4, 2026 | Xiao Deming Officer | MPWR Monolithic Power Systems, Inc. | 21,590 | $25.1M | — | Feb 4, 2026 | Form 4 ↗ 6 days later · 22,875 shares | Form 144 ↗ |
| Feb 2, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $3.4M | 10b5-1 | Feb 2, 2026 | Form 4 ↗ 2 days later · 3,000 shares | Form 144 ↗ |
| Jan 2, 2026 | Theodore Bernhard Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $2.8M | 10b5-1 | Jan 2, 2026 | Form 4 ↗ 4 days later · 3,000 shares | Form 144 ↗ |
| Dec 29, 2025 | Victor Lee Director | MPWR Monolithic Power Systems, Inc. | 2,000 | $1.9M | 10b5-1 | Dec 24, 2025 | Form 4 ↗ 8 days later · 600 shares | Form 144 ↗ |
| Dec 1, 2025 | Bernie Blegen Officer | MPWR Monolithic Power Systems, Inc. | 3,000 | $2.7M | 10b5-1 | Dec 1, 2025 | Form 4 ↗ 1 day later · 3,000 shares | Form 144 ↗ |
| Nov 26, 2025 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 20,000 | $18.5M | — | Nov 26, 2025 | Form 4 ↗ 2 days later · 20,000 shares | Form 144 ↗ |
| Nov 25, 2025 | Saria Tseng Officer | MPWR Monolithic Power Systems, Inc. | 20,000 | $18.1M | — | Nov 25, 2025 | Form 4 ↗ 3 days later · 20,000 shares | Form 144 ↗ |
| Nov 24, 2025 | Maurice Sciammas Officer | MPWR Monolithic Power Systems, Inc. | 3,976 | $3.6M | — | Nov 24, 2025 | Form 4 ↗ 1 day later · 3,976 shares | Form 144 ↗ |
The newest 50 items, most recent first. Every row links to the notice on the SEC's site, and to the Form 4 when we found one. Updated Nov 15, 2026, 6:31 PM EST.
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