# EDGAR Filing Document

**Accession Number:** 0001280452
**File Stem:** 0001437749-26-014089
**Filing Date:** 2026-4
**Character Count:** 2232
**Document Hash:** 5097b2b4926d8d53678fc32c2ed03e73
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001437749-26-014089.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001437749-26-014089

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260430

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MONOLITHIC POWER SYSTEMS INC
- **CENTRAL INDEX KEY:** 0001280452
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 770466789
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-51026
- **FILM NUMBER:** 26922334

**BUSINESS ADDRESS:**
- **STREET 1:** 1555 PALM BEACH LAKES BLVD.
- **CITY:** WEST PALM BEACH
- **STATE:** FL
- **ZIP:** 33401
- **BUSINESS PHONE:** 561-839-3999

**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**<br>

**SCHEDULE 14A**

**(Rule 14a-101)**

**INFORMATION REQUIRED IN PROXY STATEMENT**

**SCHEDULE 14A INFORMATION**

**Proxy Statement Pursuant to Section 14(a) of the Securities**

**Exchange Act of 1934**

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

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| |
|:---|
| **MONOLITHIC POWER SYSTEMS, INC.** |
| (Name of Registrant as Specified In Its Charter) |
| n/a |
| (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant) |

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Payment of Filing Fee (Check the appropriate box):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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