MPWR director granted 189 restricted stock units

Monolithic Power Systems director Victor K. Lee reported an equity award from the company.

Rhea-AI Filing Summary

Monolithic Power Systems director Victor K. Lee reported an equity award from the company. On February 3, 2026, he acquired 189 shares of common stock at $0.00 per share in connection with the Board-approved annual restricted stock unit grant to each independent director.

The footnote explains that this RSU grant will vest one year after the grant date, as long as the director continues to serve the company. After this grant, Lee beneficially owned 28,156 shares of Monolithic Power Systems common stock in total, held directly.

Insider Trade Summary

Grant/Award: 189 shares

Grant/Award 1 txn

Insider Lee Victor K

Role Director

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

Holdings After Transaction: Common Stock — 28,156 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 Victor K. Lee report on February 3, 2026?

Victor K. Lee reported receiving 189 shares of Monolithic Power Systems common stock on February 3, 2026. The shares relate to the company’s annual restricted stock unit grant for independent directors, approved by the Board and awarded at $0.00 per share.

How many MPWR shares does Victor K. Lee own after this Form 4 transaction?

After the reported transaction, Victor K. Lee beneficially owns 28,156 shares of Monolithic Power Systems common stock. This total reflects the additional 189 shares tied to the Board-approved restricted stock unit grant for independent directors on February 3, 2026.

What are the vesting terms of Victor K. Lee’s 2026 RSU grant from Monolithic Power Systems (MPWR)?

The 2026 RSU grant to Victor K. Lee will vest one year after the February 3, 2026 grant date. Vesting is conditioned on his continued service with Monolithic Power Systems as an independent director during that one-year period.

Was cash paid for the 189 MPWR shares reported by director Victor K. Lee?

No cash was paid for the 189 shares reported by Victor K. Lee; the Form 4 lists a transaction price of $0.00 per share. The shares stem from an annual restricted stock unit grant approved by the Board for independent directors.

Is Victor K. Lee a 10% owner of Monolithic Power Systems (MPWR)?

Victor K. Lee is reported as a director of Monolithic Power Systems but not as a 10% owner. The Form 4 checkbox indicates his relationship to the issuer is director only, with the 10% owner box not selected.

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

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Accepted by SEC EDGAR 02/05/2026 - 07:56 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^*

Lee Victor K

(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	28,156	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. Victor K. Lee	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.