Monolithic Power Systems (MPWR)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-31 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: MONOLITHIC POWER SYSTEMS, INC. (MPWR) CIK: 0001280452 --- Reporting Owner --- Name: Tseng Saria CIK: 0001312593 Role: Officer (EVP & General Counsel) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-31 | Code: G (Gift) Shares: -2,000 | Price: $0.00 Shares Owned After: 142,218 | Ownership: D (Direct) Footnotes: [F1] 2,000 shares were transferred from the reporting person's direct holdings to C&T Family Irrevocable Trust, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer. [Transaction #2] Security: Common Stock Date: 2026-08-31 | Code: G (Gift) Shares: +2,000 | Price: $0.00 Shares Owned After: 2,000 | Ownership: I (Indirect) | Nature: C&T Family Trust Footnotes: [F2] 2,000 shares were received by C&T Family Irrevocable Trust, 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. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: 2,000 shares were transferred from the reporting person's direct holdings to C&T Family Irrevocable Trust, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer. F2: 2,000 shares were received by C&T Family Irrevocable Trust, 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. --- Signature --- /s/ /s/ Saria Tseng (2026-09-02)