# EDGAR Filing Document

**Accession Number:** 0001280452
**File Stem:** 0001214659-23-001831
**Filing Date:** 2023-2
**Character Count:** 7335
**Document Hash:** e22e56dd1681e0345059d82e60de3d08
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001214659-23-001831.hdr.sgml**: 20230208

**ACCESSION NUMBER**: 0001214659-23-001831

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230206

**FILED AS OF DATE**: 20230208

**DATE AS OF CHANGE**: 20230208

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Sciammas Maurice
- **CENTRAL INDEX KEY:** 0001360833

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-51026
- **FILM NUMBER:** 23600532

**MAIL ADDRESS:**
- **STREET 1:** 79 GREAT OAKS BLVD
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95119
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MONOLITHIC POWER SYSTEMS INC
- **CENTRAL INDEX KEY:** 0001280452
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **IRS NUMBER:** 770466789
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 5808 LAKE WASHINGTON BLVD. NE
- **CITY:** KIRKLAND
- **STATE:** WA
- **ZIP:** 98033
- **BUSINESS PHONE:** 425-296-9956

**MAIL ADDRESS:**
- **STREET 1:** 5808 LAKE WASHINGTON BLVD. NE
- **CITY:** KIRKLAND
- **STATE:** WA
- **ZIP:** 98033

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Sciammas Maurice<br><sub>(Last) (First) (Middle)</sub><br>5808 LAKE WASHINGTON BLVD NE<br><sub>(Street)</sub><br>KIRKLAND, WA 98033<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-02-06 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Sr. V.P.of Sales and Marketing_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>MONOLITHIC POWER SYSTEMS INC [ MPWR ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2023-02-06 |  | S |  | 723<sup>(1)</sup> | D | $446.87 | 192133 | D |  |
| Common Stock | 2023-02-07 |  | A |  | 34740<sup>(2)</sup> | A | $0.00 | 226873 | D |  |
| Common Stock |  |  |  |  |  |  |  | 13502 | I | by Family Trust |
| Common Stock |  |  |  |  |  |  |  | 19458 | I | Christina Sciammas Trust FBO Oski Crew |
| Common Stock |  |  |  |  |  |  |  | 19458 | I | Maurice Sciammas Trust FBO Oski Crew |
| Common Stock |  |  |  |  |  |  |  | 2000 | I | Rosalind Sciammas Family 2021 Trust |
| Common Stock |  |  |  |  |  |  |  | 23015 | I | By Sciammas Trust 2020 |
| Common Stock |  |  |  |  |  |  |  | 26700 | 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 |  |  |  |  |  |  |  | 1699 | I | The Patrick Francis Sciammas 2020 Irrevocable Trust |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plan.

(2) On February 2, 2021, the reporting person was granted a target of 11,580 shares of restricted stock units, with the right to earn up to 300% of the target shares, subject to satisfaction of pre-determined, performance-based vesting criteria. On February 7, 2023, the Company's Compensation Committee of the Board of Directors determined and approved the achievement of the performance criteria for the restricted stock units, which resulted in 23,160 additional shares being earned by the reporting person. Of the 34,740 restricted stock units that were awarded, 17,370 will vest immediately and 17,370 will vest quarterly in the next two years.

**Signature:** /s/ Saria Tseng, attorney-in-fact for Mr. Maurice Sciammas  
**Date:** 2023-02-08

### Remarks:

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.**