<div id="readability-page-1"><div><p><span>Blegen Theodore (Bernie) Chief Financial Officer of Monolithic Power Systems Inc [MPWR] filed a Form 4 on December 2, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:</span></p><div><table><tbody><tr><td><span>Date</span></td><td><span>12/1/25</span></td></tr><tr><td><span>Transaction</span></td><td><span>Planned Sale(1)</span></td></tr><tr><td><span>Shares</span></td><td><span>3,000</span></td></tr><tr><td><span>Price</span></td><td><span>$908.21</span></td></tr><tr><td><span>Value</span></td><td><span>$2,724,623</span></td></tr></tbody></table></div><p><span>Ending Holdings: 81,994 (71,332 - Direct, 10,662 - Indirect)</span></p><ul><li><span>(1)</span></li><li><span>Executed pursuant to a prearranged trading plan (10b5-1).</span></li></ul><p><span>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.</span></p><p><span>Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data.</span></p><span> </span></div></div>

MPWR

<p>CFO Blegen Theodore of Monolithic Power Systems Inc sold 3,000 shares worth $2.7 million as part of a prearranged trading plan (10b5-1). The transaction was disclosed in a Form 4 filed with the SEC on December 2, 2025. Blegen's ending holdings are 81,994 shares, with 71,332 held directly and 10,662 indirectly.</p>

CFO Blegen Sells 3,000 ($2.7M) Of Monolithic Power Systems Inc [MPWR]