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Monolithic Power Systems (MPWR) EVP shifts 25,000 shares to family GRATs

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Maurice Sciammas, EVP, WW Sales & Marketing of Monolithic Power Systems, reported an internal bona fide gift of 25,000 shares of common stock on 2026-08-04, moving them from direct ownership to two GRATs where he serves as trustee. No funds were exchanged and no sale occurred. Following the transfer he holds 126,644 shares directly and 36,062 shares indirectly through the GRATs, in addition to other indirect family trust holdings.

Positive

  • None.

Negative

  • None.
Insider Sciammas Maurice
Role EVP, WW Sales & Marketing
Type Security Shares Price Value
Gift Common Stock F1 25,000 $0.00 $0.00
Gift Common Stock F2 25,000 $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 — 126,644 shares (Direct); Common Stock — 36,062 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 (2)
  1. F1. 25,000 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.
  2. F2. 25,000 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 25,000 shares Bona fide gift from direct holdings to two GRATs on 2026-08-04
Direct holdings after transfer 126,644 shares Common stock directly held by Maurice Sciammas after the reported gift transaction
GRAT holdings after transfer 36,062 shares Common stock held indirectly via various Sciammas GRATs after receiving transferred shares
Sciammas Family Trust holdings 52,586 shares Indirect common stock holdings via the Sciammas Family Trust as of 2026-08-04
Clement Sciammas Family 2021 Trust holdings 5,000 shares Indirect common stock holdings via the Clement Sciammas Family 2021 Trust
bona fide gift financial
"Transaction code G is described as a bona fide gift of common stock"
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.
GRATs financial
"25,000 shares were transferred from direct holdings to two GRATs"
indirect ownership financial
"Entries list indirect ownership through various family trusts and accounts"
Irrevocable Trust financial
"Holdings include The Joseph Roger Sciammas 2020 Irrevocable Trust"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.

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

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FAQ

What insider transaction did Maurice Sciammas report for MPWR?

Maurice Sciammas reported moving 25,000 MPWR common shares from his direct ownership to two GRATs as a bona fide gift. The transfer on 2026-08-04 involved no funds, no sale, and changed only the ownership structure of existing shares.

How many MPWR shares did Maurice Sciammas transfer on 2026-08-04?

He transferred 25,000 MPWR common shares from his direct holdings to two GRATs where he is trustee. Footnotes state these were internal transfers, with no cash consideration and explicitly no sale of shares taking place in the transaction.

What are Maurice Sciammas’ direct MPWR holdings after this transaction?

After the reported gift transfer, Maurice Sciammas directly holds 126,644 shares of Monolithic Power common stock. This figure reflects his remaining direct position following the movement of 25,000 shares into GRATs on 2026-08-04 as disclosed in the ownership table.

How many MPWR shares are held in GRATs associated with Maurice Sciammas?

The various Sciammas GRATs hold 36,062 MPWR common shares indirectly attributed to Maurice Sciammas after the transfer. These GRATs received the 25,000-share bona fide gift from his direct holdings and already contained additional shares before this transaction.

Does the MPWR insider transaction reflect a market sale or purchase of shares?

It does not reflect a market sale or purchase. The transaction code is G, a bona fide gift, and the footnotes confirm no funds were exchanged and no sale occurred. Shares were simply reclassified between direct ownership and GRATs associated with Maurice Sciammas.

What other indirect MPWR holdings are associated with Maurice Sciammas and his family?

Beyond GRATs, several family trusts and accounts hold MPWR shares indirectly, including the Sciammas Family Trust with 52,586 shares and multiple irrevocable and family trusts with smaller positions, all listed as indirect ownership in the Form 4 holdings section.
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)
08/04/2026
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 Stock08/04/2026G25,000(1)D$0126,644D
Common Stock08/04/2026G25,000(2)A$036,062IVarious 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. 25,000 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.
2. 25,000 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 Sciammas08/06/2026
** 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)