MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025

Nov 15, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2025-11-13

Reporting Person: Sciammas Maurice (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-13	Common Stock	G	4530	—	Disposed	26660	Indirect
2025-11-13	Common Stock	G	4530	—	Acquired	49460	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1699	Indirect
Common Stock	2000	Indirect
Common Stock	1499	Indirect
Common Stock	1299	Indirect
Common Stock	183306	Direct
Common Stock	1699	Indirect
Common Stock	4015	Indirect
Common Stock	5000	Indirect
Common Stock	1000	Indirect
Common Stock	1699	Indirect

Footnotes

F1: 4,530 shares were transferred from two 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: 4,530 shares were received by the Sciammas Family Trust, on which the reporting person is a Trustee, and transferred from two GRATs, on which the reporting person is a Trustee. No funds were exchanged and no sale of shares occurred in the transfer.