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Monolithic Power Systems EVP transfers 13,000 shares

The reported direct ending balance includes 8 shares acquired through the company’s qualified ESPP program on August 17, 2026.

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Form Type
4

Rhea-AI Filing Summary

Monolithic Power Systems, Inc. (MPWR) reported that EVP, WW Sales & Marketing Maurice Sciammas transferred 13,000 common shares from his direct holdings to two GRATs on November 3, 2026. He was a trustee of the GRATs; no funds were exchanged and no sale occurred. After the transfer, reported direct holdings were 113,652 shares, and holdings in Various Sciammas GRATs were 49,062 shares. No Rule 10b5-1 plan is reported.

Insider Sciammas Maurice
Role EVP, WW Sales & Marketing
Type Security Shares Price Value
Gift Common Stock F2, F1 13,000 $0.00 $0.00
Gift Common Stock F3 13,000 $0.00 $0.00
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 113,652 shares (Direct); Common Stock — 49,062 shares (Indirect, Various Sciammas GRATs); Common Stock — 1,699 shares (Indirect, The Joseph Roger Sciammas 2020 Irrevocable Trust); Common Stock — 2,000 shares (Indirect, Rosalind Sciammas Family 2021 Trust); Common Stock — 919 shares (Indirect, Rosalind Sciammas Brokerage Account); Common Stock — 52,586 shares (Indirect, Sciammas Family Trust); Common Stock — 1,699 shares (Indirect, The Patrick Francis Sciammas 2020 Irrevocable Trust); Common Stock — 4,015 shares (Indirect, By Sciammas Trust 2020); Common Stock — 1,000 shares (Indirect, Peter Rafferty and Eric Toothill 2021Trust); Common Stock — 1,699 shares (Indirect, The Chloe Liliane Sciammas 2020 Irrevocable Trust); Common Stock — 1,119 shares (Indirect, Clement Sciammas Trust); Common Stock — 5,000 shares (Indirect, Clement Sciammas Family 2021 Trust)
Footnotes (3)
  1. F1. Ending balance includes 8 shares acquired on August 17, 2026 through the Company's qualified ESPP program.
  2. F2. 13,000 shares were transferred from the reporting person's direct holdings to two GRATs, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer.
  3. F3. 13,000 shares were received by two GRATs, of which the reporting person is a trustee, from the reporting person's direct holdings. No funds were exchanged and no sale of shares occurred in the transfer.
Shares transferred 13,000 shares From direct holdings to two GRATs on November 3, 2026
Direct holdings after transaction 113,652 shares Reported following the November 3, 2026 transfer
Various Sciammas GRATs holdings 49,062 shares Reported following the November 3, 2026 transfer
Qualified ESPP shares 8 shares Included in the direct ending balance; acquired August 17, 2026
GRATs financial
"transferred from the reporting person's direct holdings to two GRATs"
qualified ESPP program financial
"acquired through the Company's qualified ESPP program"
bona fide gift financial
"Bona fide gift"
A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many MPWR shares did Maurice Sciammas transfer?

Maurice Sciammas, EVP, WW Sales & Marketing, transferred 13,000 common shares from his direct holdings to two GRATs on November 3, 2026. He was a trustee of the GRATs; no funds were exchanged and no shares were sold.

What did the MPWR executive’s direct ending balance include?

The reported direct ending balance includes 8 shares acquired on August 17, 2026 through Monolithic Power Systems’ qualified ESPP program.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4
FORM 4UNITED 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*
Sciammas Maurice

(Last)(First)(Middle)
1555 PALM BEACH LAKES BLVD.

(Street)
WEST PALM BEACH FLORIDA 33401

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
MONOLITHIC POWER SYSTEMS, INC. [ MPWR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, WW Sales & Marketing
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
11/03/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock11/03/2026G13,000(2)D$0113,652(1)D
Common Stock11/03/2026G13,000(3)A$049,062IVarious Sciammas GRATs
Common Stock1,699IThe Joseph Roger Sciammas 2020 Irrevocable Trust
Common Stock2,000IRosalind Sciammas Family 2021 Trust
Common Stock919IRosalind Sciammas Brokerage Account
Common Stock52,586ISciammas Family Trust
Common Stock1,699IThe Patrick Francis Sciammas 2020 Irrevocable Trust
Common Stock4,015IBy Sciammas Trust 2020
Common Stock1,000IPeter Rafferty and Eric Toothill 2021Trust
Common Stock1,699IThe Chloe Liliane Sciammas 2020 Irrevocable Trust
Common Stock1,119IClement Sciammas Trust
Common Stock5,000IClement Sciammas Family 2021 Trust
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Ending balance includes 8 shares acquired on August 17, 2026 through the Company's qualified ESPP program.
2. 13,000 shares were transferred from the reporting person's direct holdings to two GRATs, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer.
3. 13,000 shares were received by two GRATs, of which the reporting person is a trustee, from the reporting person's direct holdings. No funds were exchanged and no sale of shares occurred in the transfer.
Remarks:
/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas11/05/2026
** 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 Number.
* Form 4: SEC 1474 (03-26)

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