Michael Hsing - Oct 1, 2021 Form 4 Insider Report for MONOLITHIC POWER SYSTEMS INC (MPWR)

Role: CEO, Director
Signature: /s/ Saria Tseng, attorney-in-fact for Mr. Michael R. Hsing
Stock symbol: MPWR
Transactions as of: Oct 1, 2021
Transactions value $: -$5,247,283
Form type: 4
Date filed: 10/5/2021, 05:02 PM
Previous filing: Aug 16, 2021
Next filing: Nov 10, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MPWR	Common Stock	Sale	-$5.25M	-11K	-1.12%	$476.16	975K	Oct 1, 2021	Direct	F1, F2
holding	MPWR	Common Stock						133K	Oct 1, 2021	by M Hsing 04 Trust
holding	MPWR	Common Stock						12.8K	Oct 1, 2021	ZH Family 2020 Trust

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.
F2	The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $476.15 to $476.16. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Content

The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.

The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $476.15 to $476.16. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.