MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025

May 10, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2025-05-09

Reporting Person: Sciammas Maurice (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-05-09	Common Stock	G	1878	—	Disposed	17226	Indirect
2025-05-09	Common Stock	G	1878	—	Acquired	40094	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	10899	Indirect
Common Stock	1699	Indirect
Common Stock	2000	Indirect
Common Stock	5000	Indirect
Common Stock	16015	Indirect
Common Stock	102325	Direct
Common Stock	1699	Indirect
Common Stock	2000	Indirect
Common Stock	1699	Indirect
Common Stock	10899	Indirect

Footnotes

F1: 1,878 shares were transferred out of the Siblings 2021 GRATs, on which the reporting person is a Trustee, to the Sciammas Family Trust, on which the reporting person is a Trustee. No funds were exchanged, and no sale of shares occurred in the transfer.

F2: 1,878 shares were received by the Sciammas Family Trust, on which the reporting person is a Trustee, from Siblings 2021 GRATS, on which the reporting person is a Trustee. No funds were exchanged and no sale of shares occurred in the transfer.