Form 4: Jeff Zhou (MPWR) disposes of 193 shares; holdings now 5,611

Rhea-AI Filing Summary

Jeff Zhou, a director of Monolithic Power Systems, Inc. (MPWR), reported an open-market sale of company stock. On 08/27/2025 he disposed of 193 shares at a reported price of $870 per share, and after the transaction he directly beneficially owned 5,611 shares. The Form 4 indicates the filing was submitted by one reporting person and signed by an attorney-in-fact on behalf of Mr. Zhou.

Positive

• None.

Negative

• Director sale disclosed: Jeff Zhou disposed of 193 shares of MPWR at $870 per share on 08/27/2025, reducing his holdings to 5,611 shares.

Insights

Financial Analyst

TL;DR: A director executed a small open-market sale; no additional financial metrics disclosed.

The reported sale of 193 shares at $870 each represents a routine insider disposition disclosed under Section 16. The filing shows direct ownership of 5,611 shares following the transaction, but provides no context on total holdings, timing rationale, or planned future transactions. This item is informational for monitoring insider activity but contains no additional financial results or company operational data.

Corporate Governance Expert

TL;DR: Director sale reported; disclosure complies with Form 4 requirements but lacks explanatory detail.

The Form 4 documents a director-level sale and is properly executed by an attorney-in-fact. The report identifies the reporter as a director and indicates the form was filed by one reporting person. There are no indications of a Rule 10b5-1 plan or other dispositions in the filing. For governance review, this is a standard disclosure without additional governance concerns disclosed in the document.

Insider Trade Summary

Net Seller: 193 shares ($167,910)

Net Sell 1 txn

Insider Zhou Jeff

Role Director

Sold 193 shs ($168K)

Type	Security	Shares	Price	Value
Sale	Common Stock	193	$870.00	$168K

Holdings After Transaction: Common Stock — 5,611 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
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)
08/27/2025

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	08/27/2025		S		193	D	$870	5,611	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	08/27/2025
	** 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 MPWR Form 4?

The Form 4 reports a sale of 193 shares of Monolithic Power Systems (MPWR) on 08/27/2025 at a reported price of $870 per share.

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

Following the reported sale, Mr. Zhou directly beneficially owns 5,611 shares.

What was the reporting person's relationship to MPWR?

The filer, Jeff Zhou, is identified on the form as a Director of Monolithic Power Systems, Inc.

Was the Form 4 filed jointly or by one reporting person?

The form indicates it was filed by one reporting person.

Who signed the Form 4 submission for Jeff Zhou?

The Form 4 is signed /s/ Saria Tseng, attorney-in-fact for Mr. Jeff Zhou with the signature date shown as 08/27/2025.