SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 30
- % company
- <0.01%
- Price
- $1,534
- Value
- $46,019
Filed Jun 1, 2026
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NASDAQ · TECHNOLOGY · Holders
Monolithic Power Systems Inc (MPWR) Institutional Ownership & Insider Trading History
Recent insider purchases and sales for MPWR from Form 4 filings. Institutional holdings surface here when ownership sources publish.
Section freshness
Price Jun 24, 3:59 PM EDT · Statements Mar 30, 8:00 PM EDT
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Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 day
Provider checked •
Source: Market data provider
Newsevery 15 min
Latest item •
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Ownership read
MPWR insider sentiment: Mixed, sale-heavy.
119 sales and 1 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
MPWR
Purchases1.56K
Sales370.76K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
—
Institutional data pending
Insider stance
Mixed, sale-heavy
$455.60M sold / — bought
Latest filing
Jun 1, 2026
Most recent holder or insider filing date
Filings shown
120
0 holder / 120 insider
- Holder rows
- Pending
- Market data source
- Latest filing
- Jun 1, 2026
- Most recent holder or insider filing date
- Increased / initiated
- Pending
- 0 decreased
- 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
EVP, WW Sales & Marketing
- Shares
- 12.47K
- % company
- 0.03%
- Price
- Not reported
- Value
- Not reported
Filed May 29, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 7.57K
- % company
- 0.02%
- Price
- $1,700
- Value
- $12,860,500
Filed May 27, 2026
DEAN, ROBERT W II
Interim CFO
- Shares
- 22
- % company
- <0.01%
- Price
- $1,650
- Value
- $36,290
Filed May 26, 2026
ZHOU, JEFF
Director
- Shares
- 486
- % company
- <0.01%
- Price
- $1,680
- Value
- $816,480
Filed May 26, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 200
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 22, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 5.00K
- % company
- 0.01%
- Price
- $1,586
- Value
- $7,932,150
Filed May 22, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 352
- % company
- <0.01%
- Price
- $1,518
- Value
- $534,389
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 130
- % company
- <0.01%
- Price
- $1,521
- Value
- $197,786
Filed May 18, 2026
DEAN, ROBERT W II
Interim CFO
- Shares
- 4
- % company
- <0.01%
- Price
- $1,563
- Value
- $6,253
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 5.74K
- % company
- 0.01%
- Price
- $1,483
- Value
- $8,505,160
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 4.08K
- % company
- <0.01%
- Price
- $1,477
- Value
- $6,028,951
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 5.05K
- % company
- 0.01%
- Price
- $1,473
- Value
- $7,436,369
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 3.42K
- % company
- <0.01%
- Price
- $1,463
- Value
- $5,007,977
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 5.82K
- % company
- 0.01%
- Price
- $1,468
- Value
- $8,540,081
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 3.77K
- % company
- <0.01%
- Price
- $1,508
- Value
- $5,682,521
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 2.93K
- % company
- <0.01%
- Price
- $1,503
- Value
- $4,402,433
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 608
- % company
- <0.01%
- Price
- $1,499
- Value
- $911,672
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 862
- % company
- <0.01%
- Price
- $1,491
- Value
- $1,285,656
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 6.69K
- % company
- 0.01%
- Price
- $1,487
- Value
- $9,943,451
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 551
- % company
- <0.01%
- Price
- $1,513
- Value
- $833,724
Filed May 18, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 2.02K
- % company
- <0.01%
- Price
- $1,567
- Value
- $3,165,643
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 3.74K
- % company
- <0.01%
- Price
- $1,550
- Value
- $5,799,897
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 1.72K
- % company
- <0.01%
- Price
- $1,557
- Value
- $2,674,193
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 2.01K
- % company
- <0.01%
- Price
- $1,562
- Value
- $3,139,640
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 1.31K
- % company
- <0.01%
- Price
- $1,571
- Value
- $2,061,795
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 703
- % company
- <0.01%
- Price
- $1,578
- Value
- $1,109,158
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 447
- % company
- <0.01%
- Price
- $1,582
- Value
- $707,248
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 50
- % company
- <0.01%
- Price
- $1,586
- Value
- $79,276
Filed May 15, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 1.56K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 13, 2026
DEAN, ROBERT W II
Interim CFO
- Shares
- 2.16K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 13, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 1.56K
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 13, 2026
ELMIGER, EUGEN J
Director
- Shares
- 814
- % company
- <0.01%
- Price
- $1,566
- Value
- $1,275,017
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 320
- % company
- <0.01%
- Price
- $1,560
- Value
- $499,162
Filed May 6, 2026
ZHOU, JEFF
Director
- Shares
- 500
- % company
- <0.01%
- Price
- $1,650
- Value
- $825,000
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 834
- % company
- <0.01%
- Price
- $1,576
- Value
- $1,314,025
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 1.88K
- % company
- <0.01%
- Price
- $1,582
- Value
- $2,972,221
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 2.59K
- % company
- <0.01%
- Price
- $1,587
- Value
- $4,105,077
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 514
- % company
- <0.01%
- Price
- $1,600
- Value
- $822,472
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 1.35K
- % company
- <0.01%
- Price
- $1,591
- Value
- $2,156,320
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 2.62K
- % company
- <0.01%
- Price
- $1,596
- Value
- $4,181,024
Filed May 6, 2026
ELMIGER, EUGEN J
Director
- Shares
- 1.08K
- % company
- <0.01%
- Price
- $1,572
- Value
- $1,694,163
Filed May 6, 2026
XIAO, DEMING
EVP, Global Operations
- Shares
- 3.33K
- % company
- <0.01%
- Price
- $1,648
- Value
- $5,487,457
Filed May 6, 2026
XIAO, DEMING
EVP, Global Operations
- Shares
- 14.17K
- % company
- 0.03%
- Price
- $1,653
- Value
- $23,415,218
Filed May 6, 2026
WYNNE, EILEEN
Director
- Shares
- 335
- % company
- <0.01%
- Price
- $1,583
- Value
- $530,198
Filed May 6, 2026
XIAO, DEMING
EVP, Global Operations
- Shares
- 11.60K
- % company
- 0.02%
- Price
- $1,658
- Value
- $19,227,014
Filed May 6, 2026
XIAO, DEMING
EVP, Global Operations
- Shares
- 907
- % company
- <0.01%
- Price
- $1,661
- Value
- $1,506,872
Filed May 6, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 380
- % company
- <0.01%
- Price
- $1,584
- Value
- $601,848
Filed May 5, 2026
ZHOU, JEFF
Director
- Shares
- 500
- % company
- <0.01%
- Price
- $1,600
- Value
- $800,000
Filed May 5, 2026
ZHOU, JEFF
Director
- Shares
- 514
- % company
- <0.01%
- Price
- $1,574
- Value
- $809,283
Filed May 5, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 30
- % company
- <0.01%
- Price
- $1,589
- Value
- $47,662
Filed May 4, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 240
- % company
- <0.01%
- Price
- $1,280
- Value
- $307,092
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 120
- % company
- <0.01%
- Price
- $1,287
- Value
- $154,454
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 400
- % company
- <0.01%
- Price
- $1,292
- Value
- $516,832
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 800
- % company
- <0.01%
- Price
- $1,303
- Value
- $1,042,016
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 840
- % company
- <0.01%
- Price
- $1,319
- Value
- $1,108,170
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 4.24K
- % company
- <0.01%
- Price
- $1,313
- Value
- $5,571,608
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 1.28K
- % company
- <0.01%
- Price
- $1,308
- Value
- $1,673,316
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 560
- % company
- <0.01%
- Price
- $1,266
- Value
- $709,229
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 360
- % company
- <0.01%
- Price
- $1,270
- Value
- $457,304
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 120
- % company
- <0.01%
- Price
- $1,322
- Value
- $158,633
Filed Apr 8, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 1.68K
- % company
- <0.01%
- Price
- $1,176
- Value
- $1,976,268
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 480
- % company
- <0.01%
- Price
- $1,149
- Value
- $551,544
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 560
- % company
- <0.01%
- Price
- $1,160
- Value
- $649,387
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 1.40K
- % company
- <0.01%
- Price
- $1,180
- Value
- $1,646,582
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 684
- % company
- <0.01%
- Price
- $1,166
- Value
- $797,311
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 2.04K
- % company
- <0.01%
- Price
- $1,170
- Value
- $2,382,894
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 556
- % company
- <0.01%
- Price
- $1,144
- Value
- $636,298
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 244
- % company
- <0.01%
- Price
- $1,140
- Value
- $278,150
Filed Apr 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 292
- % company
- <0.01%
- Price
- $1,137
- Value
- $332,001
Filed Apr 1, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 160
- % company
- <0.01%
- Price
- $1,134
- Value
- $181,462
Filed Apr 1, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 184
- % company
- <0.01%
- Price
- $1,132
- Value
- $208,316
Filed Apr 1, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 576
- % company
- <0.01%
- Price
- $1,131
- Value
- $651,594
Filed Apr 1, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 30
- % company
- <0.01%
- Price
- $1,116
- Value
- $33,493
Filed Apr 1, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 188
- % company
- <0.01%
- Price
- $1,136
- Value
- $213,551
Filed Apr 1, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 2.20K
- % company
- <0.01%
- Price
- $1,023
- Value
- $2,250,600
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 80
- % company
- <0.01%
- Price
- $1,041
- Value
- $83,290
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 166
- % company
- <0.01%
- Price
- $1,036
- Value
- $171,910
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 2.44K
- % company
- <0.01%
- Price
- $1,029
- Value
- $2,511,272
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 3.19K
- % company
- <0.01%
- Price
- $1,017
- Value
- $3,249,001
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 3.36K
- % company
- <0.01%
- Price
- $1,010
- Value
- $3,392,357
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 9.08K
- % company
- 0.02%
- Price
- $1,005
- Value
- $9,127,034
Filed Mar 30, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 5.15K
- % company
- 0.01%
- Price
- $1,001
- Value
- $5,158,175
Filed Mar 30, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 30
- % company
- <0.01%
- Price
- $1,095
- Value
- $32,852
Filed Mar 20, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.44K
- % company
- <0.01%
- Price
- $1,201
- Value
- $1,729,166
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 600
- % company
- <0.01%
- Price
- $1,194
- Value
- $716,604
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 160
- % company
- <0.01%
- Price
- $1,188
- Value
- $190,117
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 480
- % company
- <0.01%
- Price
- $1,181
- Value
- $566,779
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 12.73K
- % company
- 0.03%
- Price
- $1,156
- Value
- $14,713,344
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 200
- % company
- <0.01%
- Price
- $1,173
- Value
- $234,678
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 2.08K
- % company
- <0.01%
- Price
- $1,169
- Value
- $2,426,429
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 4.00K
- % company
- <0.01%
- Price
- $1,165
- Value
- $4,660,845
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 4.99K
- % company
- 0.01%
- Price
- $1,160
- Value
- $5,789,921
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.44K
- % company
- <0.01%
- Price
- $1,217
- Value
- $1,752,653
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 3.64K
- % company
- <0.01%
- Price
- $1,206
- Value
- $4,389,185
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.24K
- % company
- <0.01%
- Price
- $1,210
- Value
- $1,500,536
Filed Feb 12, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 363
- % company
- <0.01%
- Price
- $1,159
- Value
- $420,612
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.54K
- % company
- <0.01%
- Price
- $1,183
- Value
- $1,823,908
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 2.80K
- % company
- <0.01%
- Price
- $1,178
- Value
- $3,296,298
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.99K
- % company
- <0.01%
- Price
- $1,173
- Value
- $2,330,592
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.53K
- % company
- <0.01%
- Price
- $1,168
- Value
- $1,789,961
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.37K
- % company
- <0.01%
- Price
- $1,164
- Value
- $1,589,628
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 6.08K
- % company
- 0.01%
- Price
- $1,193
- Value
- $7,250,241
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 14.58K
- % company
- 0.03%
- Price
- $1,197
- Value
- $17,452,782
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 649
- % company
- <0.01%
- Price
- $1,202
- Value
- $780,280
Filed Feb 11, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 200
- % company
- <0.01%
- Price
- $1,180
- Value
- $235,995
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 2.10K
- % company
- <0.01%
- Price
- $1,188
- Value
- $2,499,910
Filed Feb 11, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 4.30K
- % company
- <0.01%
- Price
- $1,132
- Value
- $4,869,907
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 360
- % company
- <0.01%
- Price
- $1,161
- Value
- $418,108
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 694
- % company
- <0.01%
- Price
- $1,155
- Value
- $801,542
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 1.22K
- % company
- <0.01%
- Price
- $1,151
- Value
- $1,398,599
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 3.86K
- % company
- <0.01%
- Price
- $1,146
- Value
- $4,427,758
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 16.08K
- % company
- 0.03%
- Price
- $1,142
- Value
- $18,361,430
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 6.33K
- % company
- 0.01%
- Price
- $1,137
- Value
- $7,189,944
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 280
- % company
- <0.01%
- Price
- $1,197
- Value
- $335,233
Filed Feb 10, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 880
- % company
- <0.01%
- Price
- $1,176
- Value
- $1,034,915
Filed Feb 10, 2026
LEE, VICTOR K
Director
- Shares
- 400
- % company
- <0.01%
- Price
- $1,212
- Value
- $484,864
Filed Feb 9, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 54.92K
- % company
- 0.11%
- Price
- $1,171
- Value
- $64,323,824
Filed Feb 6, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 22.88K
- % company
- 0.05%
- Price
- $1,171
- Value
- $26,790,370
Filed Feb 6, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 22.88K
- % company
- 0.05%
- Price
- $1,171
- Value
- $26,790,370
Filed Feb 6, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 30 | $1,534 | $46,019 | Jun 1, 2026 |
| 2 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 12.47K | Not reported | Not reported | May 29, 2026 |
| 3 | TSENG, SARIA EVP & General Counsel | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 7.57K | $1,700 | $12,860,500 | May 27, 2026 |
| 4 | DEAN, ROBERT W II Interim CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 22 | $1,650 | $36,290 | May 26, 2026 |
| 5 | ZHOU, JEFF Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 486 | $1,680 | $816,480 | May 26, 2026 |
| 6 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 200 | Not reported | Not reported | May 22, 2026 |
| 7 | TSENG, SARIA EVP & General Counsel | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.00K | $1,586 | $7,932,150 | May 22, 2026 |
| 8 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 352 | $1,518 | $534,389 | May 18, 2026 |
| 9 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 130 | $1,521 | $197,786 | May 18, 2026 |
| 10 | DEAN, ROBERT W II Interim CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4 | $1,563 | $6,253 | May 18, 2026 |
| 11 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.74K | $1,483 | $8,505,160 | May 18, 2026 |
| 12 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.08K | $1,477 | $6,028,951 | May 18, 2026 |
| 13 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.05K | $1,473 | $7,436,369 | May 18, 2026 |
| 14 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.42K | $1,463 | $5,007,977 | May 18, 2026 |
| 15 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.82K | $1,468 | $8,540,081 | May 18, 2026 |
| 16 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.77K | $1,508 | $5,682,521 | May 18, 2026 |
| 17 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.93K | $1,503 | $4,402,433 | May 18, 2026 |
| 18 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 608 | $1,499 | $911,672 | May 18, 2026 |
| 19 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 862 | $1,491 | $1,285,656 | May 18, 2026 |
| 20 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 6.69K | $1,487 | $9,943,451 | May 18, 2026 |
| 21 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 551 | $1,513 | $833,724 | May 18, 2026 |
| 22 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.02K | $1,567 | $3,165,643 | May 15, 2026 |
| 23 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.74K | $1,550 | $5,799,897 | May 15, 2026 |
| 24 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.72K | $1,557 | $2,674,193 | May 15, 2026 |
| 25 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.01K | $1,562 | $3,139,640 | May 15, 2026 |
| 26 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.31K | $1,571 | $2,061,795 | May 15, 2026 |
| 27 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 703 | $1,578 | $1,109,158 | May 15, 2026 |
| 28 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 447 | $1,582 | $707,248 | May 15, 2026 |
| 29 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 50 | $1,586 | $79,276 | May 15, 2026 |
| 30 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 1.56K | Not reported | Not reported | May 13, 2026 |
| 31 | DEAN, ROBERT W II Interim CFO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.16K | Not reported | Not reported | May 13, 2026 |
| 32 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.56K | Not reported | Not reported | May 13, 2026 |
| 33 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 814 | $1,566 | $1,275,017 | May 6, 2026 |
| 34 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 320 | $1,560 | $499,162 | May 6, 2026 |
| 35 | ZHOU, JEFF Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 500 | $1,650 | $825,000 | May 6, 2026 |
| 36 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 834 | $1,576 | $1,314,025 | May 6, 2026 |
| 37 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.88K | $1,582 | $2,972,221 | May 6, 2026 |
| 38 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.59K | $1,587 | $4,105,077 | May 6, 2026 |
| 39 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 514 | $1,600 | $822,472 | May 6, 2026 |
| 40 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.35K | $1,591 | $2,156,320 | May 6, 2026 |
| 41 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.62K | $1,596 | $4,181,024 | May 6, 2026 |
| 42 | ELMIGER, EUGEN J Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.08K | $1,572 | $1,694,163 | May 6, 2026 |
| 43 | XIAO, DEMING EVP, Global Operations | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.33K | $1,648 | $5,487,457 | May 6, 2026 |
| 44 | XIAO, DEMING EVP, Global Operations | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 14.17K | $1,653 | $23,415,218 | May 6, 2026 |
| 45 | WYNNE, EILEEN Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 335 | $1,583 | $530,198 | May 6, 2026 |
| 46 | XIAO, DEMING EVP, Global Operations | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 11.60K | $1,658 | $19,227,014 | May 6, 2026 |
| 47 | XIAO, DEMING EVP, Global Operations | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 907 | $1,661 | $1,506,872 | May 6, 2026 |
| 48 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 380 | $1,584 | $601,848 | May 5, 2026 |
| 49 | ZHOU, JEFF Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 500 | $1,600 | $800,000 | May 5, 2026 |
| 50 | ZHOU, JEFF Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 514 | $1,574 | $809,283 | May 5, 2026 |
| 51 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 30 | $1,589 | $47,662 | May 4, 2026 |
| 52 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 240 | $1,280 | $307,092 | Apr 8, 2026 |
| 53 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 120 | $1,287 | $154,454 | Apr 8, 2026 |
| 54 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 400 | $1,292 | $516,832 | Apr 8, 2026 |
| 55 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 800 | $1,303 | $1,042,016 | Apr 8, 2026 |
| 56 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 840 | $1,319 | $1,108,170 | Apr 8, 2026 |
| 57 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.24K | $1,313 | $5,571,608 | Apr 8, 2026 |
| 58 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.28K | $1,308 | $1,673,316 | Apr 8, 2026 |
| 59 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 560 | $1,266 | $709,229 | Apr 8, 2026 |
| 60 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 360 | $1,270 | $457,304 | Apr 8, 2026 |
| 61 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 120 | $1,322 | $158,633 | Apr 8, 2026 |
| 62 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.68K | $1,176 | $1,976,268 | Apr 6, 2026 |
| 63 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 480 | $1,149 | $551,544 | Apr 6, 2026 |
| 64 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 560 | $1,160 | $649,387 | Apr 6, 2026 |
| 65 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.40K | $1,180 | $1,646,582 | Apr 6, 2026 |
| 66 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 684 | $1,166 | $797,311 | Apr 6, 2026 |
| 67 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.04K | $1,170 | $2,382,894 | Apr 6, 2026 |
| 68 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 556 | $1,144 | $636,298 | Apr 6, 2026 |
| 69 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 244 | $1,140 | $278,150 | Apr 6, 2026 |
| 70 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 292 | $1,137 | $332,001 | Apr 1, 2026 |
| 71 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 160 | $1,134 | $181,462 | Apr 1, 2026 |
| 72 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 184 | $1,132 | $208,316 | Apr 1, 2026 |
| 73 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 576 | $1,131 | $651,594 | Apr 1, 2026 |
| 74 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 30 | $1,116 | $33,493 | Apr 1, 2026 |
| 75 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 188 | $1,136 | $213,551 | Apr 1, 2026 |
| 76 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.20K | $1,023 | $2,250,600 | Mar 30, 2026 |
| 77 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 80 | $1,041 | $83,290 | Mar 30, 2026 |
| 78 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 166 | $1,036 | $171,910 | Mar 30, 2026 |
| 79 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.44K | $1,029 | $2,511,272 | Mar 30, 2026 |
| 80 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.19K | $1,017 | $3,249,001 | Mar 30, 2026 |
| 81 | TSENG, SARIA EVP & General Counsel | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.36K | $1,010 | $3,392,357 | Mar 30, 2026 |
| 82 | TSENG, SARIA EVP & General Counsel | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 9.08K | $1,005 | $9,127,034 | Mar 30, 2026 |
| 83 | TSENG, SARIA EVP & General Counsel | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 5.15K | $1,001 | $5,158,175 | Mar 30, 2026 |
| 84 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 30 | $1,095 | $32,852 | Mar 20, 2026 |
| 85 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.44K | $1,201 | $1,729,166 | Feb 12, 2026 |
| 86 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 600 | $1,194 | $716,604 | Feb 12, 2026 |
| 87 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 160 | $1,188 | $190,117 | Feb 12, 2026 |
| 88 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 480 | $1,181 | $566,779 | Feb 12, 2026 |
| 89 | HSING, MICHAEL Director, CEO | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 12.73K | $1,156 | $14,713,344 | Feb 12, 2026 |
| 90 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 200 | $1,173 | $234,678 | Feb 12, 2026 |
| 91 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.08K | $1,169 | $2,426,429 | Feb 12, 2026 |
| 92 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.00K | $1,165 | $4,660,845 | Feb 12, 2026 |
| 93 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.99K | $1,160 | $5,789,921 | Feb 12, 2026 |
| 94 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.44K | $1,217 | $1,752,653 | Feb 12, 2026 |
| 95 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.64K | $1,206 | $4,389,185 | Feb 12, 2026 |
| 96 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.24K | $1,210 | $1,500,536 | Feb 12, 2026 |
| 97 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 363 | $1,159 | $420,612 | Feb 11, 2026 |
| 98 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.54K | $1,183 | $1,823,908 | Feb 11, 2026 |
| 99 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.80K | $1,178 | $3,296,298 | Feb 11, 2026 |
| 100 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.99K | $1,173 | $2,330,592 | Feb 11, 2026 |
| 101 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.53K | $1,168 | $1,789,961 | Feb 11, 2026 |
| 102 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.37K | $1,164 | $1,589,628 | Feb 11, 2026 |
| 103 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 6.08K | $1,193 | $7,250,241 | Feb 11, 2026 |
| 104 | HSING, MICHAEL Director, CEO | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 14.58K | $1,197 | $17,452,782 | Feb 11, 2026 |
| 105 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 649 | $1,202 | $780,280 | Feb 11, 2026 |
| 106 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 200 | $1,180 | $235,995 | Feb 11, 2026 |
| 107 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.10K | $1,188 | $2,499,910 | Feb 11, 2026 |
| 108 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.30K | $1,132 | $4,869,907 | Feb 10, 2026 |
| 109 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 360 | $1,161 | $418,108 | Feb 10, 2026 |
| 110 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 694 | $1,155 | $801,542 | Feb 10, 2026 |
| 111 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 1.22K | $1,151 | $1,398,599 | Feb 10, 2026 |
| 112 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.86K | $1,146 | $4,427,758 | Feb 10, 2026 |
| 113 | HSING, MICHAEL Director, CEO | 0.03% | SaleOpen-market or direct sale reported on Form 4. | 16.08K | $1,142 | $18,361,430 | Feb 10, 2026 |
| 114 | HSING, MICHAEL Director, CEO | 0.01% | SaleOpen-market or direct sale reported on Form 4. | 6.33K | $1,137 | $7,189,944 | Feb 10, 2026 |
| 115 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 280 | $1,197 | $335,233 | Feb 10, 2026 |
| 116 | HSING, MICHAEL Director, CEO | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 880 | $1,176 | $1,034,915 | Feb 10, 2026 |
| 117 | LEE, VICTOR K Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 400 | $1,212 | $484,864 | Feb 9, 2026 |
| 118 | HSING, MICHAEL Director, CEO | 0.11% | SaleOpen-market or direct sale reported on Form 4. | 54.92K | $1,171 | $64,323,824 | Feb 6, 2026 |
| 119 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | 0.05% | SaleOpen-market or direct sale reported on Form 4. | 22.88K | $1,171 | $26,790,370 | Feb 6, 2026 |
| 120 | TSENG, SARIA EVP & General Counsel | 0.05% | SaleOpen-market or direct sale reported on Form 4. | 22.88K | $1,171 | $26,790,370 | Feb 6, 2026 |
Showing 120 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.
Frequently asked
Common questions.
Who are the largest MPWR shareholders?
Monolithic Power Systems Inc (MPWR) institutional holders are ranked by reported share count when ownership data publishes filing rows.
What is institutional ownership of MPWR?
Monolithic Power Systems Inc (MPWR) institutional ownership appears when filing-based market data returns holder rows. TECHi does not fill unavailable ownership fields with placeholder shareholders.
Where can I see Monolithic Power Systems Inc insider transactions?
Monolithic Power Systems Inc (MPWR) has 120 Form 4 insider transactions on file, most recently on Jun 1, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are MPWR insiders buying or selling?
Recent MPWR insider activity reads Mixed, sale-heavy: 119 sales and 1 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active MPWR insider?
HSING, MICHAEL is the most active MPWR insider by absolute share movement, with 194,923 shares moving across the filing history. Review the action labels before treating that activity as buying or selling.