{"transactions":[{"id":4635024,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":130,"price":1356.94,"value":176402.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 $1,356.78 to $1,357.00.  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":818264,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635023,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":10967,"price":1351.43,"value":14821132.81,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F9","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 $1,350.84 to $1,355.11.  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":818394,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635022,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":6343,"price":1347.15,"value":8544972.45,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","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 $1,345.66 to $1,350.47.  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":829361,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635021,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":5783,"price":1343.76,"value":7770964.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","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 $1,340.69 to $1,345.65.  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":835704,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635020,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":2949,"price":1338.66,"value":3947708.34,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","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 $1,335.68 to $1,340.66.  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":841487,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635019,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":1111,"price":1333.34,"value":1481340.74,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","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 $1,330.65 to $1,335.51.  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":844436,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635018,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":2121,"price":1328.54,"value":2817833.34,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"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 $1,325.65 to $1,330.62.  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":845547,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":4635017,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-09-30T21:21:16.000Z","date":"2026-09-28","kind":"sale","planned":true,"acquired":false,"shares":596,"price":1323.31,"value":788692.76,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","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 $1,320.64 to $1,325.61.  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":"F2","text":"Ending balance includes 1 share acquired on August 17, 2026, through the Company's qualified ESPP program."}],"balance_after":847668,"source":{"system":"sec-edgar","filing":"0001214659-26-012375","document":"marketforms-74049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/marketforms-74049.xml","form_type":"4"}},{"id":1041,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-09-02T21:26:23.000Z","date":"2026-08-31","kind":"gift","planned":false,"acquired":true,"shares":2000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"C&T Family Trust"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"2,000 shares were received by C&T Family Irrevocable Trust, of which the reporting person is a trustee, from the reporting person's direct holdings. No funds were exchanged and no sale of shares occurred in the transfer."}],"balance_after":2000,"source":{"system":"sec-edgar","filing":"0001214659-26-011363","document":"marketforms-73915.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1312593/000121465926011363/marketforms-73915.xml","form_type":"4"}},{"id":1040,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-09-02T21:26:23.000Z","date":"2026-08-31","kind":"gift","planned":false,"acquired":false,"shares":2000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"2,000 shares were transferred from the reporting person's direct holdings to C&T Family Irrevocable Trust, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer."}],"balance_after":142218,"source":{"system":"sec-edgar","filing":"0001214659-26-011363","document":"marketforms-73915.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1312593/000121465926011363/marketforms-73915.xml","form_type":"4"}},{"id":674912,"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":"other","planned":false,"acquired":false,"shares":5,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","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":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":675998,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19854,"kind":"person","name":"CHANG KUO WEI HERBERT","position":1,"cik":"0001192171","reported_name":"CHANG KUO WEI HERBERT","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-25T23:13:50.000Z","date":"2026-08-24","kind":"sale","planned":false,"acquired":false,"shares":50,"price":1281.57,"value":64078.5,"ownership":{"direct":true},"balance_after":515,"source":{"system":"sec-edgar","filing":"0001214659-26-010853","document":"marketforms-73899.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926010853/marketforms-73899.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":687845,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":19854,"kind":"person","name":"CHANG KUO WEI HERBERT","position":1,"cik":"0001192171","reported_name":"CHANG KUO WEI HERBERT","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-13T21:23:50.000Z","date":"2026-08-11","kind":"sale","planned":false,"acquired":false,"shares":50,"price":1420,"value":71000.0,"ownership":{"direct":true},"balance_after":565,"source":{"system":"sec-edgar","filing":"0001214659-26-010101","document":"marketforms-73754.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926010101/marketforms-73754.xml","form_type":"4"}},{"id":694027,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-08-07T00:31:18.000Z","date":"2026-08-04","kind":"gift","planned":false,"acquired":true,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Various Sciammas GRATs"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"25,000 shares were received by two GRATs, of which the reporting person is a trustee, from the reporting person's direct holdings. No funds were exchanged and no sale of shares occurred in the transfer."}],"balance_after":36062,"source":{"system":"sec-edgar","filing":"0001214659-26-009744","document":"marketforms-73704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926009744/marketforms-73704.xml","form_type":"4"}},{"id":694026,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-08-07T00:31:18.000Z","date":"2026-08-04","kind":"gift","planned":false,"acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"25,000 shares were transferred from the reporting person's direct holdings to two GRATs, of which the reporting person is a trustee. No funds were exchanged and no sale of shares occurred in the transfer."}],"balance_after":126644,"source":{"system":"sec-edgar","filing":"0001214659-26-009744","document":"marketforms-73704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926009744/marketforms-73704.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":695459,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-08-05T21:33:16.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":30,"price":1343.94,"value":40318.2,"ownership":{"direct":false,"nature":"Clement Sciammas Trust"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/19/2025."}],"balance_after":1119,"source":{"system":"sec-edgar","filing":"0001214659-26-009676","document":"marketforms-73662.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926009676/marketforms-73662.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":706672,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":110,"price":1405.71,"value":154628.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F19","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 $1,404.25 to $1,406.04.  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":151644,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706671,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":117,"price":1400.45,"value":163852.65,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F18","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 $1,398.97 to $1,400.85.  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":151754,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706670,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":213,"price":1396.16,"value":297382.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F17","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 $1,393.94 to $1,398.92.  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":151871,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706669,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":50,"price":1388.19,"value":69409.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F16","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 $1,388.18 to $1,388.22.  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":152084,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706668,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":410,"price":1384.11,"value":567485.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F15","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 $1,381.79 to $1,386.22.  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":152134,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706667,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":418,"price":1378.73,"value":576309.14,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F14","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 $1,376.51 to $1,381.11.  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":152544,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706666,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":472,"price":1375.47,"value":649221.84,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F13","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 $1,371.23 to $1,376.20.  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":152962,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706665,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":240,"price":1369.18,"value":328603.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F12","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 $1,366.15 to $1,371.04.  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":153434,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706664,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":50,"price":1359.36,"value":67968.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F11","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 $1,357.88 to $1,362.57. 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":153674,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706663,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":5640,"price":1352.95,"value":7630638.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 $1,352.13 to $1,357.03. 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":153724,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706662,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":1506,"price":1348.91,"value":2031458.46,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F9","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 $1,347.09 to $1,352.00.  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":159364,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706661,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":1864,"price":1344.16,"value":2505514.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F8","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 $1,341.99 to $1,346.96. 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":160870,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706660,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":1460,"price":1339.59,"value":1955801.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","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 $1,336.97 to $1,341.96. 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":162734,"source":{"system":"sec-edgar","filing":"0001214659-26-008703","document":"marketforms-73614.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/marketforms-73614.xml","form_type":"4"}},{"id":706659,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-07-17T21:43:36.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":776,"price":1334.59,"value":1035641.84,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","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 $1,331.95 to $1,336.95. 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The prices for the transactions reported on this line range from $1,647.84 to $1,650.16.  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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":856602,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769802,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":6688,"price":1486.76,"value":9943450.88,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","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":857464,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769801,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":5737,"price":1482.51,"value":8505159.87,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","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":864152,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769800,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":4082,"price":1476.96,"value":6028950.72,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","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 $1,474.95 to $1,479.85.  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":869889,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769799,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":5049,"price":1472.84,"value":7436369.16,"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 $1,469.95 to $1,474.94.  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":873971,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769798,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":5819,"price":1467.62,"value":8540080.78,"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.  The prices for the transactions reported on this line range from $1,464.97 to $1,469.94.  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":879020,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.xml","form_type":"4"}},{"id":769797,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":45632,"kind":"person","name":"Hsing Michael","position":1,"cik":"0001308676","reported_name":"Hsing Michael","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-21T00:10:31.000Z","date":"2026-05-18","kind":"sale","planned":false,"acquired":false,"shares":3424,"price":1462.61,"value":5007976.64,"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.  The prices for the transactions reported on this line range from $1,459.96 to $1,464.86.  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 29 shares acquired on February 17, 2026 through the Company's qualified ESPP program."}],"balance_after":884839,"source":{"system":"sec-edgar","filing":"0001214659-26-006625","document":"marketforms-73205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006625/marketforms-73205.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":771700,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":50,"price":1585.51,"value":79275.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F9","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 $1,585.17 to $1,586.76.  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":166644,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771699,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":447,"price":1582.21,"value":707247.87,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F8","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 $1,579.97 to $1,584.43.  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":166694,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771698,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":703,"price":1577.75,"value":1109158.25,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","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 $1,574.9 to $1,579.7.  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":167141,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771697,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":1312,"price":1571.49,"value":2061794.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","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 $1,569.78 to $1,574.53.  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":167844,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771696,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":2020,"price":1567.15,"value":3165643.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","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 $1,564.75 to $1,569.67.  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":169156,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771695,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":2010,"price":1562.01,"value":3139640.1,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"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 $1,559.61 to $1,564.59.  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":171176,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771694,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":1717,"price":1557.48,"value":2674193.16,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","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 $1,554.59 to $1,559.37.  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":173186,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":771693,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-19T23:09:36.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":3741,"price":1550.36,"value":5799896.76,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted on 11/24/2025."},{"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 $1,549.62 to $1,554.55.  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":174903,"source":{"system":"sec-edgar","filing":"0001214659-26-006583","document":"marketforms-73194.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006583/marketforms-73194.xml","form_type":"4"}},{"id":776886,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-15T23:45:32.000Z","date":"2026-05-13","kind":"gift","planned":false,"acquired":true,"shares":1563,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Sciammas Family Trust"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"1,563 shares were received by the Sciammas Family Trust, of which the reporting person is a Trustee, and transferred from three GRATs, of which the reporting person is a Trustee. No funds were exchanged and no sale of shares occurred in the transfer."}],"balance_after":51023,"source":{"system":"sec-edgar","filing":"0001214659-26-006521","document":"marketforms-73173.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926006521/marketforms-73173.xml","form_type":"4"}},{"id":776885,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":25810,"kind":"person","name":"Sciammas Maurice","position":1,"cik":"0001360833","reported_name":"Sciammas Maurice","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, WW Sales & Marketing"}}],"security":"Common Stock","published_at":"2026-05-15T23:45:32.000Z","date":"2026-05-13","kind":"gift","planned":false,"acquired":false,"shares":1563,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Various Sciammas GRATs"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1,563 shares were transferred from three GRATs, of which the reporting person is a Trustee, to the Sciammas Family Trust, of which the reporting person is a Trustee. 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No funds were exchanged and no sale of shares occurred in the transfer. 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The prices for the transactions reported on this line range from $1,321.50 to $1,322.56. 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":156983,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810265,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":840,"price":1319.25,"value":1108170.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 $1,316.25 to $1,321.04. 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":157103,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810264,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":4244,"price":1312.82,"value":5571608.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F9","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 $1,310.27 to $1,315.08. 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":157943,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810263,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":1279,"price":1308.3,"value":1673315.7,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F8","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 $1,305.08 to $1,310.00. 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":162187,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810262,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":800,"price":1302.52,"value":1042016.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F7","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 $1,299.99 to $1,304.82. 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":163466,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810261,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":400,"price":1292.08,"value":516832.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F6","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 $1,290.95 to $1,294.78. 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":164266,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810260,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":120,"price":1287.12,"value":154454.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","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 $1,284.26 to $1,289.24. 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":164666,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810259,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":240,"price":1279.55,"value":307092.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"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 $1,277.78 to $1,281.49. 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":164786,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810258,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":360,"price":1270.29,"value":457304.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","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 $1,269.36 to $1,272.23. 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":165026,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}},{"id":810257,"issuer":{"id":877,"kind":"organization","name":"MONOLITHIC POWER SYSTEMS, INC.","symbol":"MPWR"},"owners":[{"id":878,"kind":"person","name":"Tseng Saria","position":1,"cik":"0001312593","reported_name":"Tseng Saria","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & General Counsel"}}],"security":"Common Stock","published_at":"2026-04-10T16:46:56.000Z","date":"2026-04-08","kind":"sale","planned":true,"acquired":false,"shares":560,"price":1266.48,"value":709228.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted on 11/28/2025."},{"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 $1,264.04 to $1,268.56. 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":165386,"source":{"system":"sec-edgar","filing":"0001214659-26-004535","document":"marketforms-72913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1280452/000121465926004535/marketforms-72913.xml","form_type":"4"}}],"next_cursor":"2026-04-10T16:46:56.000000Z,810257"}