Monolithic Power Systems (MPWR) director receives 189-share annual RSU grant

Rhea-AI Filing Summary

Monolithic Power Systems director Carintia Martinez reported an annual equity award in the form of restricted stock units. On February 3, 2026, she acquired 189 shares of common stock at $0 per share, bringing her directly held beneficial ownership to 1,067 shares.

The grant was part of the company’s regular annual restricted stock unit program for independent directors. According to the disclosure, this RSU award will vest one year after the grant date, provided she continues serving on the board during that period.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Martinez Carintia

Role Director

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

Holdings After Transaction: Common Stock — 1,067 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^*

Martinez Carintia

(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	1,067	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. Carintia Martinez	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 Carintia Martinez report?

Director Carintia Martinez reported receiving an annual equity award from Monolithic Power Systems. On February 3, 2026, she acquired 189 shares of common stock at $0 per share as part of an independent director restricted stock unit grant approved by the board.

How many MPWR shares does Carintia Martinez beneficially own after the grant?

After the reported award, Carintia Martinez beneficially owns 1,067 shares of Monolithic Power Systems common stock. This figure reflects her directly held position following the grant of 189 shares tied to the annual restricted stock unit program for independent directors.

What are the vesting terms of the MPWR director restricted stock unit grant?

The restricted stock unit grant to MPWR independent directors vests one year after the February 3, 2026 grant date. Vesting is conditioned on each director’s continued service with the company during that one-year period, aligning the equity award with ongoing board participation.

Was cash paid for the MPWR shares received by director Carintia Martinez?

No cash was paid for these shares. The filing shows Carintia Martinez acquired 189 shares of Monolithic Power Systems common stock at a price of $0 per share, reflecting a board-approved equity compensation grant rather than an open-market purchase transaction.

Is the MPWR Form 4 transaction a routine director equity grant?

Yes. The filing states that on February 3, 2026, the Board of Directors approved the annual restricted stock unit grant to each independent director, including Carintia Martinez. Such grants are part of the company’s regular director compensation structure rather than a discretionary trade.