Monolithic Power (NASDAQ: MPWR) director awarded 189-share annual RSU grant

Rhea-AI Filing Summary

Monolithic Power Systems director Eileen Wynne reported receiving an annual equity award in the form of restricted stock units. On February 3, 2026, she was granted 189 shares of common stock at a price of $0 per share, as part of the independent directors’ annual RSU grant program.

The RSU grant will vest one year after the grant date, conditioned on her continued service with the company. Following this award, she beneficially owned 1,342 shares of Monolithic Power Systems common stock in direct form.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Wynne Eileen

Role Director

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

Holdings After Transaction: Common Stock — 1,342 shares (Direct)

Footnotes (1)

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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^*

Wynne Eileen

(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	1,342	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 Ms. Eileen Wynne	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.

FAQ

What insider transaction did MPWR director Eileen Wynne report on this Form 4?

Director Eileen Wynne reported receiving 189 shares of Monolithic Power Systems common stock at $0 per share. The grant represents her annual restricted stock unit award approved for each independent director on February 3, 2026, increasing her directly held position to 1,342 shares.

How many MPWR shares does director Eileen Wynne own after the reported RSU grant?

After the reported transaction, director Eileen Wynne beneficially owned 1,342 shares of Monolithic Power Systems common stock. This total reflects the addition of 189 shares granted on February 3, 2026, under the company’s annual restricted stock unit program for independent directors.

What are the vesting terms of the MPWR restricted stock units granted to Eileen Wynne?

The restricted stock units granted to director Eileen Wynne will vest one year after the February 3, 2026 grant date. Vesting is conditioned on her continued service with Monolithic Power Systems, meaning she must remain an independent director through the one-year anniversary for full vesting.

Was the MPWR stock grant to director Eileen Wynne a routine board-approved award?

Yes. The filing states that on February 3, 2026, the Board of Directors approved the annual restricted stock unit grant to each independent director. The 189-share award to Eileen Wynne reflects this routine, board-approved compensation program rather than an open-market purchase or sale.

Did director Eileen Wynne pay cash for the 189 MPWR shares she received?

No cash was paid for the 189 shares reported in the transaction, which are shown at a price of $0 per share. The shares were issued as part of an annual restricted stock unit grant, a form of equity compensation provided to independent directors by the company.