DEAN ROBERT W II
- Shares
- 7.13K
- % company
- 0.01%
- Price
- $1,344
- Value
- $9,587,334
Filed Aug 5, 2026
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NasdaqGS · Technology · Holders
Monolithic Power Systems, Inc. (MPWR) Insider Trading History
Recent Form 4 insider activity for MPWR, with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Price Aug 18, 4:00 PM EDT · Statements Jun 29, 8:00 PM EDT
Ownership read
MPWR insider sentiment: Net selling.
112 sales and 0 purchases appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.
Insider flow
MPWR
Purchases0
Sales32.76M
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Insider stance
Net selling
$43.73B sold / — bought
Latest filing
Aug 5, 2026
Most recent holder or insider filing date
Filings shown
120
120 insider
- Latest filing
- Aug 5, 2026
- Most recent holder or insider filing date
- Insider rows
- 120
- Market data source
Recent insider transactions
Monolithic Power Systems, Inc. (MPWR) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
Sciammas Maurice
- Shares
- 36.06K
- % company
- 0.07%
Filed Aug 4, 2026
Sciammas Maurice
- Shares
- 126.64K
- % company
- 0.26%
Filed Aug 4, 2026
Sciammas Maurice
- Shares
- 1.12K
- % company
- <0.01%
- Price
- $1,344
- Value
- $1,503,869
Filed Aug 3, 2026
DEAN ROBERT W II
- Shares
- 7.24K
- % company
- 0.01%
Filed Jul 25, 2026
Sciammas Maurice
- Shares
- 151.64K
- % company
- 0.31%
- Price
- $1,406
- Value
- $213,167,487
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 151.75K
- % company
- 0.31%
- Price
- $1,400
- Value
- $212,523,889
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 151.87K
- % company
- 0.31%
- Price
- $1,396
- Value
- $212,036,215
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 152.08K
- % company
- 0.31%
- Price
- $1,388
- Value
- $211,121,488
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 152.13K
- % company
- 0.31%
- Price
- $1,384
- Value
- $210,570,191
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 152.54K
- % company
- 0.31%
- Price
- $1,379
- Value
- $210,316,989
Filed Jul 15, 2026
Sciammas Maurice
- Shares
- 152.96K
- % company
- 0.31%
- Price
- $1,375
- Value
- $210,394,642
Filed Jul 15, 2026
| # | Insider | % company | Action | Shares | Filing date |
|---|---|---|---|---|---|
| 1 | DEAN ROBERT W II | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 7.13K | Aug 5, 2026 |
| 2 | Sciammas Maurice | 0.07% | GiftGift transfer. Usually non-cash and not an open-market sale. | 36.06K | Aug 4, 2026 |
| 3 | Sciammas Maurice | 0.26% | GiftGift transfer. Usually non-cash and not an open-market sale. | 126.64K | Aug 4, 2026 |
| 4 | Sciammas Maurice | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.12K | Aug 3, 2026 |
| 5 | DEAN ROBERT W II | 0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 7.24K | Jul 25, 2026 |
| 6 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 151.64K | Jul 15, 2026 |
| 7 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 151.75K | Jul 15, 2026 |
| 8 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 151.87K | Jul 15, 2026 |
| 9 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 152.08K | Jul 15, 2026 |
| 10 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 152.13K | Jul 15, 2026 |
| 11 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 152.54K | Jul 15, 2026 |
| 12 | Sciammas Maurice | 0.31% | SaleOpen-market or direct sale reported on Form 4. | 152.96K | Jul 15, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding.
Frequently asked
Common questions.
Who is the most active reported MPWR insider?
Hsing Michael has the largest absolute share movement in the displayed MPWR filing rows, totaling 21.95 million shares. The action labels provide the transaction context.