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The prices for the transactions reported on this line range from $1,660.99 to $1,662 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":205959,"source":{"system":"sec-edgar","filing":"0001214659-26-005858","document":"marketforms-73083.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926005858/marketforms-73083.xml","form_type":"4"}},{"id":786465,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2026-05-08T22:15:19.000Z","date":"2026-05-06","kind":"sale","planned":false,"acquired":false,"shares":11597,"price":1657.93,"value":19227014.21,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","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 $1,655.80 to $1,660.72. 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":206866,"source":{"system":"sec-edgar","filing":"0001214659-26-005858","document":"marketforms-73083.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926005858/marketforms-73083.xml","form_type":"4"}},{"id":786464,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2026-05-08T22:15:19.000Z","date":"2026-05-06","kind":"sale","planned":false,"acquired":false,"shares":14167,"price":1652.8,"value":23415217.6,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price is the weighted average sale price for the transactions reported on this line. 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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":218463,"source":{"system":"sec-edgar","filing":"0001214659-26-005858","document":"marketforms-73083.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926005858/marketforms-73083.xml","form_type":"4"}},{"id":786463,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2026-05-08T22:15:19.000Z","date":"2026-05-06","kind":"sale","planned":false,"acquired":false,"shares":3329,"price":1648.38,"value":5487457.02,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price is the weighted average sale price for the transactions reported on this line. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Ending balance includes 27 shares acquired on February 17, 2026 through the Company's qualified ESPP program."}],"balance_after":232630,"source":{"system":"sec-edgar","filing":"0001214659-26-005858","document":"marketforms-73083.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926005858/marketforms-73083.xml","form_type":"4"}},{"id":911619,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2026-02-10T23:59:14.000Z","date":"2026-02-06","kind":"sale","planned":false,"acquired":false,"shares":22875,"price":1171.1637,"value":26790369.6375,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan."}],"balance_after":235932,"source":{"system":"sec-edgar","filing":"0001214659-26-001451","document":"marketforms-72094.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926001451/marketforms-72094.xml","form_type":"4"}},{"id":917569,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2026-02-06T00:36:09.000Z","date":"2026-02-03","kind":"grant","planned":false,"acquired":true,"shares":57170,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On February 7, 2023, the reporting person was granted performance-based restricted stock units (\"PSUs\") subject to the achievement of performance conditions over a three-year performance period. On February 3, 2026, the Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance criteria for the PSUs, which resulted in 57,170 shares being awarded to the reporting person, subject to tax withholdings. 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On October 25, 2025, the Company's Compensation Committee of the Board of Directors certified and approved the achievement of the performance criteria for the MSUs, which resulted in 135,520 shares being awarded to the reporting person. 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The prices for the transactions reported on this line range from $950.00 to $950.11.  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":29714,"source":{"system":"sec-edgar","filing":"0001214659-24-015184","document":"marketforms-66837.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465924015184/marketforms-66837.xml","form_type":"4"}},{"id":1425132,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":48680,"kind":"person","name":"Xiao Deming","position":1,"cik":"0001308647","reported_name":"Xiao Deming","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Global Operations"}}],"security":"Common Stock","published_at":"2024-08-22T23:48:19.000Z","date":"2024-08-22","kind":"gift","planned":false,"acquired":true,"shares":8968,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"by Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"8,968 shares were received by the spouse from the reporting person. 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