[Form 4] Monolithic Power Systems, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Xiao Deming, identified as EVP, Global Operations of Monolithic Power Systems, reported an internal transfer of company common stock on Form 4. The filing shows 945 shares were moved from Mr. Xiao's direct holdings into the Christopher Chao Xiao Trust and the form states explicitly that no funds were exchanged.

Following the reported transaction the Form 4 lists 120,660 shares beneficially owned directly by the reporting person, 4,336 shares beneficially owned indirectly by the Christopher Chao Xiao Trust, and 20,455 shares held indirectly by a spouse.

Positive

• Transaction disclosure is explicit: the Form 4 states the transfer and that no funds were exchanged
• Post-transaction ownership totals provided: 120,660 direct, 4,336 indirect (trust), 20,455 indirect (spouse)

Negative

• None.

Insights

Corporate Governance Expert

TL;DR Routine internal transfer to a family trust disclosed; no sale or proceeds reported.

The Form 4 documents a non-sale transfer of 945 shares from the officer's direct holdings to a named family trust, with the filing explicitly stating that no funds were exchanged. This is a standard estate/planning or trust-consolidation activity rather than a market sale, and the reporting includes post-transaction beneficial ownership totals for direct and indirect holdings. For governance and compliance reviewers, the disclosure aligns with Section 16 reporting requirements and clarifies ownership structure.

Insider Transactions Analyst

TL;DR Transaction is internal and non-dispositive to the market; impact on outstanding float is negligible.

The filing shows a gift/transfer-type transaction coded and explained as a transfer with no consideration exchanged. Beneficial ownership is itemized after the transfer: 120,660 shares direct, 4,336 shares indirect via the Christopher Chao Xiao Trust, and 20,455 shares indirect by spouse. Because the transaction was not a sale, it should have limited immediate pricing impact, and the clear explanation reduces ambiguity for investors tracking insider activity.

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^*

Xiao Deming

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Global Operations

3. Date of Earliest Transaction (Month/Day/Year)
08/11/2025

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	08/11/2025		G		945	A	$0(1)	4,336	I	Christopher Chao Xiao Trust
Common Stock	08/11/2025		G		945	D	$0(2)	120,660	D
Common Stock								20,455	I	by Spouse

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. 945 shares were received by Christopher Chao Xiao Trust from the reporting person. No funds were exchanged and no sale of shares occurred in the transfer.

2. 945 shares were transferred from the reporting person's direct holdings to Christopher Chao Xiao Trust. No funds were exchanged and no sale of shares occurred in the transfer.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Deming Xiao	08/11/2025
	** 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 did the MPWR insider report on this Form 4?

The Form 4 reports that Xiao Deming, EVP, transferred 945 shares of Monolithic Power Systems common stock to the Christopher Chao Xiao Trust.

Was the transfer of MPWR shares a sale for cash?

No. The filing explicitly states no funds were exchanged in the transfer; it is not reported as a sale.

How many MPWR shares does the reporting person own after the transaction?

The Form 4 lists 120,660 shares beneficially owned directly by the reporting person after the reported transaction.

How many shares are held indirectly related to the reporting person?

The filing shows 4,336 shares indirectly held by the Christopher Chao Xiao Trust and 20,455 shares indirectly held by the reporting person’s spouse.

What is the reporting person's role at Monolithic Power Systems (MPWR)?

The Form 4 identifies the reporting person as an Officer with the title EVP, Global Operations.