Form 4: Jeff Zhou lists 6,204 MPWR shares owned after 200-share transaction

Rhea-AI Filing Summary

Jeff Zhou, a director of Monolithic Power Systems, Inc. (MPWR), reported a transaction on 08/12/2025. The Form 4 shows a Transaction Code: S on common stock with a reported quantity of 200 shares and a price listed as $830. Following the reported transaction the filing shows 6,204 shares beneficially owned in a direct form. The form was signed by attorney-in-fact Saria Tseng on 08/12/2025.

Positive

• Timely disclosure: Form 4 filed showing the required insider transaction details
• Clear ownership detail: Filing shows 6,204 shares beneficially owned following the transaction and lists ownership as direct

Negative

• Insider sale reported: Transaction Code S with 200 shares and a listed price of $830

Insights

Securities Analyst

TL;DR: Director Jeff Zhou filed a Form 4 reporting a small common stock transaction on 08/12/2025.

The filing documents a Transaction Code S for common stock dated 08/12/2025 with a reported quantity of 200 shares and a price shown as $830. The filing states 6,204 shares are beneficially owned after the transaction and ownership is listed as direct. This document is a routine Section 16 disclosure showing an insider transaction and the signature by an attorney-in-fact is included.

Corporate Governance Expert

TL;DR: The Form 4 is a standard insider disclosure showing a small sale and a stated remaining direct holding.

The report identifies the reporting person as Jeff Zhou with relationship to the issuer marked as Director. The filing indicates the form was filed by one reporting person and includes the required signature line signed by Saria Tseng as attorney-in-fact on 08/12/2025. The document provides the basic compliance elements investors expect from an insider transaction disclosure.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Zhou Jeff

(Last) (First) (Middle)

5808 LAKE WASHINGTON BLVD NE

(Street)

KIRKLAND WA 98033

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS INC [ MPWR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/12/2025		S		200	D	$830	6,204	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Jeff Zhou	08/12/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transaction did Jeff Zhou report on Form 4 for MPWR?

The Form 4 reports a Transaction Code S on common stock dated 08/12/2025 for 200 shares at a price shown as $830.

How many MPWR shares does Jeff Zhou beneficially own after the reported transaction?

The filing shows 6,204 shares beneficially owned following the reported transaction, held in direct form.

What is Jeff Zhou's relationship to Monolithic Power Systems (MPWR)?

The Form 4 identifies the reporting person, Jeff Zhou, as a Director of Monolithic Power Systems, Inc.

Who signed the Form 4 for Jeff Zhou and when?

The Form 4 is signed by Saria Tseng, attorney-in-fact for Mr. Jeff Zhou, dated 08/12/2025.

Was the Form 4 filed by one reporting person or multiple persons?

The filing indicates the Form was filed by one reporting person.