Monolithic Power director granted 189 MPWR shares

Monolithic Power Systems director Jeff Zhou received an equity grant of 189 shares of common stock on February 3, 2026.

Rhea-AI Filing Summary

Monolithic Power Systems director Jeff Zhou received an equity grant of 189 shares of common stock on February 3, 2026. These shares were awarded at a price of $0 per share as part of the company’s annual restricted stock unit grant to each independent director.

The RSU grant will vest one year after the grant date, conditioned on Mr. Zhou’s continued service with the company. Following this grant, he beneficially owns 5,800 shares of Monolithic Power Systems common stock in direct ownership.

Insider Trade Summary

Grant/Award: 189 shares

Grant/Award 1 txn

Insider Zhou Jeff

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	189	$0.00	$0.00

Holdings After Transaction: Common Stock — 5,800 shares (Direct)

Footnotes (1)

1. F1. On February 3, 2026, the Board of Directors approved the annual restricted stock unit grant to each independent director. The RSU grant will vest one year after the grant date, subject to continued service with the company.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MPWR director Jeff Zhou report on this Form 4?

Jeff Zhou reported receiving 189 shares of Monolithic Power Systems common stock as an equity award. The grant occurred on February 3, 2026 at a price of $0 per share and reflects the company’s annual restricted stock unit grant to independent directors.

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

After the February 3, 2026 equity grant, Jeff Zhou beneficially owns 5,800 shares of Monolithic Power Systems common stock. This total includes the 189 shares awarded in the transaction, which were reported as directly owned following the grant on the Form 4 filing.

What are the vesting terms of the restricted stock unit grant to MPWR’s independent directors?

The annual restricted stock unit grant to each independent director vests one year after the February 3, 2026 grant date. Vesting is conditioned on continued service with Monolithic Power Systems, meaning directors must remain in their roles through the one-year anniversary to receive the shares.

Was there any cash consideration paid for the 189 MPWR shares granted to Jeff Zhou?

No cash consideration was paid for the 189 shares granted to Jeff Zhou; the shares were issued at a price of $0 per share. This indicates they were received as an equity compensation award, not purchased on the open market or through a cash transaction.

What is the role of Jeff Zhou at Monolithic Power Systems (MPWR) according to this filing?

Jeff Zhou is identified as a director of Monolithic Power Systems in this Form 4 filing. The reported transaction reflects an annual equity compensation grant awarded to each independent director, aligning his interests with shareholders through ownership of common stock in the company.

Is the reported MPWR equity grant to Jeff Zhou classified as a direct or indirect holding?

The 189-share equity grant to Jeff Zhou is classified as a direct holding in the Form 4. The table lists his ownership form as "D" for direct, and no footnote indicates that the shares are held through a separate entity or indirect ownership structure.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/05/2026 - 08:03 PM Learn about SEC filing dates

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)

1555 PALM BEACH LAKES BLVD.

(Street)

WEST PALM BEACH FL 33401

(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)
02/03/2026

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	02/03/2026		A		189(1)	A	$0	5,800	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:

1. On February 3, 2026, the Board of Directors approved the annual restricted stock unit grant to each independent director. The RSU grant will vest one year after the grant date, subject to continued service with the company.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Jeff Zhou	02/03/2026
	** 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.