Maurice Sciammas - 25 Oct 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role
EVP, WW Sales & Marketing
Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas
Issuer symbol
MPWR
Transactions as of
25 Oct 2025
Transactions value $
$0
Form type
4
Filing time
28 Oct 2025, 21:35:34 UTC
Previous filing
21 Aug 2025
Next filing
31 Oct 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sciammas Maurice EVP, WW Sales & Marketing 5808 LAKE WASHINGTON BLVD NE, KIRKLAND /s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas 27 Oct 2025 0001360833

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Award $0 +136K +132.44% $0.00 238K 25 Oct 2025 Direct F1, F2
holding MPWR Common Stock 9.48K 25 Oct 2025 Maurice Sciammas Trust FBO Oski Crew
holding MPWR Common Stock 1.7K 25 Oct 2025 The Joseph Roger Sciammas 2020 Irrevocable Trust
holding MPWR Common Stock 2K 25 Oct 2025 Rosalind Sciammas Family 2021 Trust
holding MPWR Common Stock 9.48K 25 Oct 2025 Christina Sciammas Trust FBO Oski Crew
holding MPWR Common Stock 1.5K 25 Oct 2025 Clement Sciammas Brokerage Account
holding MPWR Common Stock 1.5K 25 Oct 2025 Rosalind Sciammas Brokerage Account
holding MPWR Common Stock 44.9K 25 Oct 2025 Sciammas Family Trust
holding MPWR Common Stock 12.2K 25 Oct 2025 Various Sciammas GRATs
holding MPWR Common Stock 1.7K 25 Oct 2025 The Patrick Francis Sciammas 2020 Irrevocable Trust
holding MPWR Common Stock 4.02K 25 Oct 2025 By Sciammas Trust 2020
holding MPWR Common Stock 5K 25 Oct 2025 Clement Sciammas Family 2021 Trust
holding MPWR Common Stock 1K 25 Oct 2025 Peter Rafferty and Eric Toothill 2021Trust
holding MPWR Common Stock 1.7K 25 Oct 2025 The Chloe Liliane Sciammas 2020 Irrevocable Trust
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On October 25, 2022, the reporting person was granted market-based restricted stock units ("MSUs") subject to the achievement of five stock price targets and relative total stockholder return percentile rank over a three-year performance and vesting period. On October 25, 2025, the Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance criteria for the MSUs, which resulted in 135,520 shares being awarded to the reporting person. All of the shares fully vested on October 25, 2025, pursuant to the grant agreement.
F2 Ending balance includes 4 shares acquired on August 15, 2025 through the Company's qualified ESPP program.