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SEC EDGAR · Forms 3/4/5Updated through Oct 30, 2026•103 filings

MPWR

MONOLITHIC POWER SYSTEMS, INC.

Net sales of $40.7M over the last 3 months

4 sellers account for the net balance. There is no cluster of three distinct buyers within 30 days. We found no CEO/CFO purchases over 12 months.

How to read this signal

Only open-market P purchases and S sales count toward the signal. Vesting, options, taxes and gifts remain in the source data but do not trigger alerts. Rule 10b5-1 trades are shown as informational.

JSON example

3-month balance

−$40,665,592

0 buyers · 4 sellers

12-month purchases

$0.00

0 distinct insiders

12-month sales

$557,504,229

11 distinct insiders

Highlighted alerts

37

63 Rule 10b5-1 trades treated as informational

Buying cluster · 30 days

Fewer than three distinct buyers

CEO/CFO purchases · 12 months

No executive purchases found

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Form 4 raw → Raspberry

The value is in what we do not call a signal.

The SEC XML stores every transaction. Raspberry keeps that evidence, reads the footnotes and separates voluntary open-market activity from vesting, option exercises, gifts, tax withholding, stock purchase and dividend reinvestment plans and pre-programmed 10b5-1 trades.

100
Raw transactions
Everything returned by the filing
100
Voluntary view
P/S trades after deterministic checks
13
Administrative noise
Stored, never alerted
48
10b5-1
Shown as informational
SEC ownership XML facts
Code
S
Shares
32
Price
$1,298
Footnotes
3

The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,296.07 to $1,298.01. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares.

Raspberry interpretation
Informational — no alert

Reason: tax_withholding. The filing footnotes identify tax withholding.

Verify in SEC EDGAR

Recent transactions

Voluntary purchases and sales; administrative noise stays hidden.

100 transactions

Hsing Michael

CEO

Sale 10b5-1
Shares
130
Price
$1,357
Value
$176,402
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
10,967
Price
$1,351
Value
$14,821,133
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
6,343
Price
$1,347
Value
$8,544,972
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
5,783
Price
$1,344
Value
$7,770,964
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
2,949
Price
$1,339
Value
$3,947,708
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
1,111
Price
$1,333
Value
$1,481,341
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
2,121
Price
$1,329
Value
$2,817,833
Open SEC filing

Hsing Michael

CEO

Sale 10b5-1
Shares
596
Price
$1,323
Value
$788,693
Open SEC filing

CHANG KUO WEI HERBERT

Director

SaleAlert
Shares
50
Price
$1,282
Value
$64,079
Open SEC filing

CHANG KUO WEI HERBERT

Director

SaleAlert
Shares
50
Price
$1,420
Value
$71,000
Open SEC filing

DEAN ROBERT W II

Interim CFO

SaleAlert
Shares
105
Price
$1,344
Value
$141,148
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
30
Price
$1,344
Value
$40,318
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
50
Price
$1,359
Value
$67,968
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
5,640
Price
$1,353
Value
$7,630,638
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
1,506
Price
$1,349
Value
$2,031,458
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
1,864
Price
$1,344
Value
$2,505,514
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
1,460
Price
$1,340
Value
$1,955,801
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
776
Price
$1,335
Value
$1,035,642
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
464
Price
$1,329
Value
$616,795
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
409
Price
$1,324
Value
$541,487
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
110
Price
$1,406
Value
$154,628
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
117
Price
$1,400
Value
$163,853
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
213
Price
$1,396
Value
$297,382
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
50
Price
$1,388
Value
$69,410
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
410
Price
$1,384
Value
$567,485
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
418
Price
$1,379
Value
$576,309
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
472
Price
$1,375
Value
$649,222
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
240
Price
$1,369
Value
$328,603
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
274
Price
$1,318
Value
$361,247
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
527
Price
$1,314
Value
$692,494
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
30
Price
$1,352
Value
$40,548
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
30
Price
$1,534
Value
$46,019
Open SEC filing

Tseng Saria

EVP & General Counsel

SaleAlert
Shares
7,565
Price
$1,700
Value
$12,860,500
Open SEC filing

Zhou Jeff

Director

SaleAlert
Shares
486
Price
$1,680
Value
$816,480
Open SEC filing

Tseng Saria

EVP & General Counsel

SaleAlert
Shares
5,000
Price
$1,586
Value
$7,932,150
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
3,769
Price
$1,508
Value
$5,682,521
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
2,929
Price
$1,503
Value
$4,402,433
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
608
Price
$1,499
Value
$911,672
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
862
Price
$1,491
Value
$1,285,656
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
6,688
Price
$1,487
Value
$9,943,451
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
5,737
Price
$1,483
Value
$8,505,160
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
4,082
Price
$1,477
Value
$6,028,951
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
5,049
Price
$1,473
Value
$7,436,369
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
130
Price
$1,521
Value
$197,786
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
352
Price
$1,518
Value
$534,389
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
551
Price
$1,513
Value
$833,724
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
5,819
Price
$1,468
Value
$8,540,081
Open SEC filing

Hsing Michael

CEO

SaleAlert
Shares
3,424
Price
$1,463
Value
$5,007,977
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
50
Price
$1,586
Value
$79,276
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
447
Price
$1,582
Value
$707,248
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
703
Price
$1,578
Value
$1,109,158
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
1,312
Price
$1,571
Value
$2,061,795
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
2,020
Price
$1,567
Value
$3,165,643
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
2,010
Price
$1,562
Value
$3,139,640
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
1,717
Price
$1,557
Value
$2,674,193
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
3,741
Price
$1,550
Value
$5,799,897
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
514
Price
$1,600
Value
$822,472
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
2,619
Price
$1,596
Value
$4,181,024
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
1,355
Price
$1,591
Value
$2,156,320
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
2,587
Price
$1,587
Value
$4,105,077
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
1,879
Price
$1,582
Value
$2,972,221
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
834
Price
$1,576
Value
$1,314,025
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
1,078
Price
$1,572
Value
$1,694,163
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
814
Price
$1,566
Value
$1,275,017
Open SEC filing

Elmiger Eugen J

Director

SaleAlert
Shares
320
Price
$1,560
Value
$499,162
Open SEC filing

Xiao Deming

EVP, Global Operations

SaleAlert
Shares
907
Price
$1,661
Value
$1,506,872
Open SEC filing

Xiao Deming

EVP, Global Operations

SaleAlert
Shares
11,597
Price
$1,658
Value
$19,227,014
Open SEC filing

Xiao Deming

EVP, Global Operations

SaleAlert
Shares
14,167
Price
$1,653
Value
$23,415,218
Open SEC filing

Xiao Deming

EVP, Global Operations

SaleAlert
Shares
3,329
Price
$1,648
Value
$5,487,457
Open SEC filing

Wynne Eileen

Director

SaleAlert
Shares
335
Price
$1,583
Value
$530,198
Open SEC filing

Zhou Jeff

Director

SaleAlert
Shares
500
Price
$1,650
Value
$825,000
Open SEC filing

Zhou Jeff

Director

SaleAlert
Shares
500
Price
$1,600
Value
$800,000
Open SEC filing

Zhou Jeff

Director

SaleAlert
Shares
514
Price
$1,574
Value
$809,283
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

SaleAlert
Shares
380
Price
$1,584
Value
$601,848
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
30
Price
$1,589
Value
$47,662
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
120
Price
$1,322
Value
$158,633
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
840
Price
$1,319
Value
$1,108,170
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
4,244
Price
$1,313
Value
$5,571,608
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
1,279
Price
$1,308
Value
$1,673,316
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
800
Price
$1,303
Value
$1,042,016
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
400
Price
$1,292
Value
$516,832
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
120
Price
$1,287
Value
$154,454
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
240
Price
$1,280
Value
$307,092
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
360
Price
$1,270
Value
$457,304
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
560
Price
$1,266
Value
$709,229
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
1,396
Price
$1,180
Value
$1,646,582
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
1,680
Price
$1,176
Value
$1,976,268
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
2,036
Price
$1,170
Value
$2,382,894
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
684
Price
$1,166
Value
$797,311
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
560
Price
$1,160
Value
$649,387
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
480
Price
$1,149
Value
$551,544
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
556
Price
$1,144
Value
$636,298
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
244
Price
$1,140
Value
$278,150
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
292
Price
$1,137
Value
$332,001
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
188
Price
$1,136
Value
$213,551
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
160
Price
$1,134
Value
$181,462
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
184
Price
$1,132
Value
$208,316
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
576
Price
$1,131
Value
$651,594
Open SEC filing

Sciammas Maurice

EVP, WW Sales & Marketing

Sale 10b5-1
Shares
30
Price
$1,116
Value
$33,493
Open SEC filing

Tseng Saria

EVP & General Counsel

Sale 10b5-1
Shares
80
Price
$1,041
Value
$83,290
Open SEC filing

“Alert” means a voluntary, unscheduled transaction according to the filing; it is not an investment recommendation. Official source: SEC EDGAR.