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MONOLITHIC POWER SYSTEMS INC

For the period ended Dec 31, 2023. Filed Feb 29, 2024.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2023 · Filed Feb 29, 2024

MPWR$1,388.05+16.6%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Item 9B.Other Information

10b5-1 Trading Plans

Certain of our executive officers have entered into trading plans pursuant to Rule10b5-1(c) of the Securities Exchange Act of1934, as amended. A trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of our common stock, including the sale of shares acquired pursuant to the2004 ESPP and the Amended2004 ESPP, and upon vesting of RSUs.*** During thethree months ended December 31, 2023*,no director or officer of the Company adopted, modified or terminated trading plans intended to satisfy the affirmative defense conditions of Rule10b5-1(c) as defined in Item408(a) of Regulation S-K. During thethree months ended* December 31, 2023,*no pre-existing trading plans intended to satisfy the affirmative defense conditions of Rule10b5-1(c) were modified or terminated, andno other written trading arrangements that arenot intended to qualify for the Rule10b5-1(c) affirmative defense were adopted, modified, or terminated.

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