Other3

MONOLITHIC POWER SYSTEMS, INC.

Total Value

$NaN

Filing Date

Oct 29, 2026

1 transactions

Trade Summary

On Oct 27, 2026, Balow Frank Anthony III, Insider, reported $NaN of MONOLITHIC POWER SYSTEMS, INC. (MPWR) across 1 transactions. The filing covers company securities and reflects balanced net activity of $NaN. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Insider Information

Name: Balow Frank Anthony III
Role: Insider
Location: WEST PALM BEACH, FL

Filing Details

Filing Date: Oct 29, 2026
Transaction Date: Oct 27, 2026
Accession Number: 0001214659-26-013445
Form Type: 3

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Footnotes

(F1)Includes an aggregate of 1,206 shares of restricted stock units that vest, subject to continued employment, as follows: 104 shares on 11/22/2026; 121 shares on 1/1/2027; 104 shares on 2/22/2027; 121 shares on 4/1/2027; 102 shares on 5/22/2027; 121 shares on 7/1/2027; 106 shares on 8/22/2027; 121 shares on 10/1/2027; 102 shares on 11/22/2027; 106 shares on 2/22/2028; 16 shares on 5/22/2028; 18 shares on 8/22/2028; 16 shares on 11/22/2028; 18 shares on 2/22/2029; 7 shares on 5/22/2029; 8 shares on 8/22/2029; 7 shares on 11/22/2029; 8 shares on 2/22/2030.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Balow Frank Anthony III

(Last)

(First)

(Middle)

1555 PALM BEACH LAKES BLVD.

(Street)

WEST PALM BEACH

33401

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/27/2026

3. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS, INC. [ MPWR ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Financial Officer

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	2,941⁽¹⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. Includes an aggregate of 1,206 shares of restricted stock units that vest, subject to continued employment, as follows: 104 shares on 11/22/2026; 121 shares on 1/1/2027; 104 shares on 2/22/2027; 121 shares on 4/1/2027; 102 shares on 5/22/2027; 121 shares on 7/1/2027; 106 shares on 8/22/2027; 121 shares on 10/1/2027; 102 shares on 11/22/2027; 106 shares on 2/22/2028; 16 shares on 5/22/2028; 18 shares on 8/22/2028; 16 shares on 11/22/2028; 18 shares on 2/22/2029; 7 shares on 5/22/2029; 8 shares on 8/22/2029; 7 shares on 11/22/2029; 8 shares on 2/22/2030.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Frank Anthony Balow III	10/29/2026
	** 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 5 (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.

Form 3 as rendered by the SEC from accession 0001214659-26-013445.

MONOLITHIC POWER SYSTEMS, INC.

Trade Summary

Company Information

Insider Information

Filing Details

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Footnotes

SEC Form 3

SEC Filing

SEC Form 3