MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2026

Feb 5, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2026-02-03

Reporting Person: Xiao Deming (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-03	Common Stock	A	57170	—	Acquired	258807	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20455	Indirect
Common Stock	4336	Indirect

Footnotes

F1: On February 7, 2023, the reporting person was granted performance-based restricted stock units ("PSUs") subject to the achievement of performance conditions over a three-year performance period. On February 3, 2026, the Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance criteria for the PSUs, which resulted in 57,170 shares being awarded to the reporting person, subject to tax withholdings. All of the shares fully vested and were released on February 3, 2026, pursuant to the grant agreement.