FORM 4
☐ Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Sciammas Maurice		 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)
Sr. V.P.of Sales and Marketing
(Last)          (First)          (Middle)

5808 LAKE WASHINGTON BLVD NE		 3. Date of Earliest Transaction (MM/DD/YYYY)

5/4/2023
(Street)

KIRKLAND, WA 98033		 4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)        (State)        (Zip)
Rule 10b5-1(c) Transaction Indication
☐ Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 5/4/2023  S  991 (1)D$459.60 205206 D  
Common Stock         14852 I by Family Trust 
Common Stock         2000 I Rosalind Sciammas Family 2021 Trust 
Common Stock         23015 I By Sciammas Trust 2020 
Common Stock         25350 I By GRAT 
Common Stock         1699 I The Chloe Liliane Sciammas 2020 Irrevocable Trust 
Common Stock         1699 I The Joseph Roger Sciammas 2020 Irrevocable Trust 
Common Stock         5000 I Clement Sciammas Family 2021 Trust 
Common Stock         2000 I Peter Rafferty and Eric Toothill 2021Trust 
Common Stock         19458 I Christina Sciammas Trust FBO Oski Crew 
Common Stock         19458 I Maurice Sciammas Trust FBO Oski Crew 
Common Stock         1699 I The Patrick Francis Sciammas 2020 Irrevocable Trust 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
(1) The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Sciammas Maurice
5808 LAKE WASHINGTON BLVD NE
KIRKLAND, WA 98033

Sr. V.P.of Sales and Marketing
Signatures
/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas5/5/2023
**Signature of Reporting PersonDate
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 control number.
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