Monolithic Power EVP reports 30-share stock sale

Monolithic Power Systems executive Maurice Sciammas, EVP of Worldwide Sales & Marketing, reported an open-market sale of 30 shares of Common Stock at $1,351.61 per share by the Clement Sciammas Trust on July 1, 2026.

Rhea-AI Filing Summary

Monolithic Power Systems executive Maurice Sciammas, EVP of Worldwide Sales & Marketing, reported an open-market sale of 30 shares of Common Stock at $1,351.61 per share by the Clement Sciammas Trust on July 1, 2026. The transaction was carried out under a Rule 10b5-1 trading plan adopted on November 19, 2025, indicating it was pre-scheduled. After this sale, the Clement Sciammas Trust held 1,149 shares indirectly. The filing also lists Sciammas’s broader holdings, including 166,644 shares held directly and additional indirect positions in various family trusts, GRATs, and brokerage accounts.

Insider Trade Summary 10b5-1

Net Seller: 30 shares

Net Sell 12 txns

Insider Sciammas Maurice

Role EVP, WW Sales & Marketing

Sold 30 shs ($41K)

Type	Security	Shares	Price	Value
Sale	Common Stock	30	$1,351.61	$41K
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	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,149 shares (Indirect, Clement Sciammas Trust); Common Stock — 166,644 shares (Direct); 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 — 51,023 shares (Indirect, Sciammas Family Trust); Common Stock — 12,625 shares (Indirect, Various Sciammas GRATs); 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 — 5,000 shares (Indirect, Clement Sciammas Family 2021 Trust)

Footnotes (1)

1. F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025.

Key Figures

Shares sold: 30 shares Sale price per share: $1,351.61 per share Trust holdings after sale: 1,149 shares +3 more

6 metrics

Shares sold 30 shares Open-market sale by Clement Sciammas Trust on July 1, 2026

Sale price per share $1,351.61 per share Price for the 30-share open-market sale

Trust holdings after sale 1,149 shares Clement Sciammas Trust position following transaction

Direct holdings 166,644 shares Common Stock held directly by Maurice Sciammas

Sciammas Family Trust holdings 51,023 shares Indirect Common Stock position in Sciammas Family Trust

Various GRATs holdings 12,625 shares Indirect Common Stock position in various Sciammas GRATs

Key Terms

Rule 10b5-1 trading plan, Common Stock, Irrevocable Trust, GRATs, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Common Stock financial

"security_title: "Common Stock" for all reported positions and transactions"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Irrevocable Trust financial

"The Chloe Liliane 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.

GRATs financial

"nature_of_ownership: "Various Sciammas GRATs""

indirect ownership financial

"ownership_type: "indirect" and ownership_code: "I" for trust and brokerage accounts"

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

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Accepted by SEC EDGAR 07/06/2026 - 05:51 PM EDT Learn about SEC filing dates

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).

X

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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, WW Sales & Marketing

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/01/2026		S		30(1)	D	$1,351.61	1,149	I	Clement Sciammas Trust
Common Stock								166,644	D
Common Stock								1,699	I	The Joseph Roger Sciammas 2020 Irrevocable Trust
Common Stock								2,000	I	Rosalind Sciammas Family 2021 Trust
Common Stock								919	I	Rosalind Sciammas Brokerage Account
Common Stock								51,023	I	Sciammas Family Trust
Common Stock								12,625	I	Various Sciammas GRATs
Common Stock								1,699	I	The Patrick Francis Sciammas 2020 Irrevocable Trust
Common Stock								4,015	I	By Sciammas Trust 2020
Common Stock								1,000	I	Peter Rafferty and Eric Toothill 2021Trust
Common Stock								1,699	I	The Chloe Liliane Sciammas 2020 Irrevocable Trust
Common Stock								5,000	I	Clement 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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025.

Remarks:

	/s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas	07/06/2026
	** 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 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)