Insider Sciammas Files Form 4 for Monolithic Power Systems

TL;DR

**Insider Maurice Sciammas filed a Form 4 for Monolithic Power Systems, signaling a change in his stock ownership.**

AI Summary

Maurice Sciammas, an insider at Monolithic Power Systems Inc., filed a Form 4 on March 24, 2026, indicating changes in his beneficial ownership of the company's securities. While the filing details aren't fully provided, a Form 4 typically reports transactions like stock sales, purchases, or option exercises. This matters to investors because insider activity can signal management's confidence (or lack thereof) in the company's future prospects, potentially influencing stock price.

Why It Matters

Insider trading activity, even if not fully detailed here, can provide clues about how those closest to the company view its valuation and future, which can impact investor sentiment.

Risk Assessment

Risk Level: low — This filing is purely informational and does not inherently pose a direct risk, though the underlying transaction could be interpreted as positive or negative.

Analyst Insight

An investor should await the full details of the Form 4 to understand the nature of Maurice Sciammas's transaction (e.g., sale, purchase, option exercise) before drawing conclusions, as the current filing only indicates a change occurred.

Key Players & Entities

• Maurice Sciammas (person) — Reporting insider
• Monolithic Power Systems Inc. (company) — Issuer of securities
• 0001360833 (other) — CIK for Maurice Sciammas
• 0001280452 (other) — CIK for Monolithic Power Systems Inc.
• 2026-03-24 (date) — Filing Date

FAQ

Key Financial Figures

• $1,094.79 — ctions reported on this line range from $1,094.79 to $1,095.19. The reporting person unde
• $1,095.19 — ed on this line range from $1,094.79 to $1,095.19. The reporting person undertakes to pro

Filing Documents

• marketforms-72730.html (4)
• marketforms-72730.xml (4) — 12KB
• 0001214659-26-003765.txt ( ) — 13KB

From the Filing

SEC FORM 4 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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) 03/20/2026 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 178,644 (1) D Common Stock 03/20/2026 S 30 (2) D $ 1,095.07 (3) 1,269 I Clement Sciammas Trust Common Stock 1,699 I The Joseph Roger Sciammas 2020 Irrevocable Trust Common Stock 2,000 I Rosalind Sciammas Family 2021 Trust Common Stock 1,299 I Rosalind Sciammas Brokerage Account Common Stock 26,660 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 Common Stock 49,460 I Sciammas Family 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. Ending balance includes 19 shares acquired on February 17, 2026 through the Company's qualified ESPP program. 2. These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025. 3. The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,094.79 to $1,095.19. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Remarks: /s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas 03/24/2026 ** 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 r

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