Mr. Deming Xiao - 30 Oct 2025 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role
EVP, Global Operations
Signature
/s/ Saria Tseng, attorney-in-fact for Mr. Deming Xiao
Issuer symbol
MPWR
Transactions as of
30 Oct 2025
Net transactions value
-$59,813,490
Form type
4
Filing time
31 Oct 2025, 16:39:57 UTC
Previous filing
28 Oct 2025
Next filing
05 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Xiao Deming EVP, Global Operations 5808 LAKE WASHINGTON BLVD NE, KIRKLAND /s/ Saria Tseng, attorney-in-fact for Mr. Deming Xiao 30 Oct 2025 0001308647

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MPWR Common Stock Tax liability $59,813,490 -54,543 -21% $1096.63 201,637 30 Oct 2025 Direct F1
holding MPWR Common Stock 20,455 30 Oct 2025 by Spouse
holding MPWR Common Stock 4,336 30 Oct 2025 Christopher Chao Xiao Trust
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The sales transaction reported in this Form 4 represents shares of common stock withheld by the Company to satisfy the income tax obligations in connection with the earnout and vesting of the market-based restricted stock units granted in October 2022, previously reported in a Form 4.