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Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares."}],"balance_after":7089,"source":{"system":"sec-edgar","filing":"0001214659-26-010932","document":"marketforms-73892.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926010932/marketforms-73892.xml","form_type":"4"}},{"id":674911,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-08-26T23:22:23.000Z","date":"2026-08-24","kind":"sale","planned":false,"acquired":false,"shares":32,"price":1297.72,"value":41527.04,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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 $1,296.07 to $1,298.01.  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."}],"balance_after":7094,"source":{"system":"sec-edgar","filing":"0001214659-26-010932","document":"marketforms-73892.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926010932/marketforms-73892.xml","form_type":"4"}},{"id":681266,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-08-20T00:44:57.000Z","date":"2026-08-17","kind":"sale","planned":false,"acquired":false,"shares":6,"price":1413.64,"value":8481.84,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units."}],"balance_after":7126,"source":{"system":"sec-edgar","filing":"0001214659-26-010630","document":"marketforms-73781.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926010630/marketforms-73781.xml","form_type":"4"}},{"id":694048,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-08-06T22:20:55.000Z","date":"2026-08-05","kind":"sale","planned":false,"acquired":false,"shares":105,"price":1344.27,"value":141148.35,"ownership":{"direct":true},"balance_after":7132,"source":{"system":"sec-edgar","filing":"0001214659-26-009739","document":"marketforms-73703.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926009739/marketforms-73703.xml","form_type":"4"}},{"id":702172,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-07-28T22:42:12.000Z","date":"2026-07-25","kind":"grant","planned":false,"acquired":true,"shares":1359,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On July 25, 2023, the reporting person was granted market-based restricted stock units (\"MSUs\") subject to the achievement of stock price targets and relative total stockholder return percentile rank over a three-year performance period. On July 25, 2026, the Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance conditions for the MSUs, which resulted in an award of 1,359 shares to the reporting person. 1/3 of the shares will vest on July 25, 2027, 1/3 of the shares will vest on July 25, 2028, and 1/3 of the shares will vest on July 25, 2029, pursuant to the grant agreement."}],"balance_after":7237,"source":{"system":"sec-edgar","filing":"0001214659-26-009117","document":"marketforms-72961.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926009117/marketforms-72961.xml","form_type":"4"}},{"id":760097,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-05-28T23:46:09.000Z","date":"2026-05-26","kind":"sale","planned":false,"acquired":false,"shares":22,"price":1649.56,"value":36290.32,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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 $1,647.84 to $1,650.16.  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."}],"balance_after":5878,"source":{"system":"sec-edgar","filing":"0001214659-26-006861","document":"marketforms-73221.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926006861/marketforms-73221.xml","form_type":"4"}},{"id":769900,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-05-20T22:52:40.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":4,"price":1563.28,"value":6253.12,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported sale was to cover tax withholding obligations upon the vesting of restricted stock units."}],"balance_after":5900,"source":{"system":"sec-edgar","filing":"0001214659-26-006622","document":"marketforms-72960.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926006622/marketforms-72960.xml","form_type":"4"}},{"id":776957,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19455,"kind":"person","name":"DEAN ROBERT W II","position":1,"cik":"0001445300","reported_name":"DEAN ROBERT W II","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Interim CFO"}}],"security":"Common Stock","published_at":"2026-05-15T20:15:34.000Z","date":"2026-05-13","kind":"other","planned":false,"acquired":false,"shares":2156,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The reported transaction involved a transfer of securities from the reporting person's direct holdings to an individual who is not an immediate family member sharing the same household. No funds were exchanged and no sale of shares occurred in the transfer. Following the completion of the transfer, the reporting person no longer retains any pecuniary interest in the shares."}],"balance_after":5904,"source":{"system":"sec-edgar","filing":"0001214659-26-006498","document":"marketforms-73154.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1445300/000121465926006498/marketforms-73154.xml","form_type":"4"}}]}