Mr. Maurice Sciammas - 04 Aug 2026 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS, INC. (MPWR)

Reporting relationship
EVP, WW Sales & Marketing
Issuer ticker
MPWR
Reported as of
04 Aug 2026
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
4
Accepted by SEC
06 Aug 2026, 20:31:18 UTC
Prior SEC filing
05 Aug 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas

Key filing fact

Mr. Maurice Sciammas filed Form 4 for MONOLITHIC POWER SYSTEMS, INC. (MPWR) on 06 Aug 2026.

Key facts

  • This page summarizes Mr. Maurice Sciammas's Form 4 filing for MONOLITHIC POWER SYSTEMS, INC. (MPWR).
  • 2 reported transactions and 0 derivative rows are listed below.
  • Accepted by SEC: 06 Aug 2026, 20:31.

Change

  • Previous filing in this sequence was filed on 05 Aug 2026.
  • Current net transaction value: $0.

Research use

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001360833 Primary reporting owner

Sciammas Maurice

Relationship
EVP, WW Sales & Marketing
Address
1555 PALM BEACH LAKES BLVD., WEST PALM BEACH
Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas
Signature date
06 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MPWR transaction

Common Stock

Gift

Transaction value
Shares
-25,000
Change %
-16%
Price
$0.000000*
Shares after
126,644
Date
04 Aug 2026
Ownership
Direct
Footnotes
F1
MPWR transaction

Common Stock

Gift

Transaction value
Shares
+25,000
Change %
+226%
Price
$0.000000*
Shares after
36,062
Date
04 Aug 2026
Ownership
Various Sciammas GRATs
Footnotes
F2
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,699
Date
04 Aug 2026
Ownership
The Joseph Roger Sciammas 2020 Irrevocable Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
2,000
Date
04 Aug 2026
Ownership
Rosalind Sciammas Family 2021 Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
919
Date
04 Aug 2026
Ownership
Rosalind Sciammas Brokerage Account
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
52,586
Date
04 Aug 2026
Ownership
Sciammas Family Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,699
Date
04 Aug 2026
Ownership
The Patrick Francis Sciammas 2020 Irrevocable Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
4,015
Date
04 Aug 2026
Ownership
By Sciammas Trust 2020
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,000
Date
04 Aug 2026
Ownership
Peter Rafferty and Eric Toothill 2021Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,699
Date
04 Aug 2026
Ownership
The Chloe Liliane Sciammas 2020 Irrevocable Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,119
Date
04 Aug 2026
Ownership
Clement Sciammas Trust
MPWR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
5,000
Date
04 Aug 2026
Ownership
Clement Sciammas Family 2021 Trust
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

25,000 shares were transferred from the reporting person's direct holdings to two GRATs, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer.

Footnote F2

25,000 shares were received by two GRATs, of which the reporting person is a trustee, from the reporting person's direct holdings. No funds were exchanged and no sale of shares occurred in the transfer.

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