# Monolithic Power Systems, Inc. (MPWR) insider trading, Q3 2026 Canonical: https://sec-api.dev/insider-trading/mpwr > 39 non-derivative transactions: 0 purchases, 33 sales ($61.0M). CIK 1280452. | Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing | | --- | --- | --- | --- | --- | --- | --- | --- | | 2026-09-28 | Hsing Michael | Director, Officer | S | 596.0 | 1323.31 | 847668.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 2121.0 | 1328.54 | 845547.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 1111.0 | 1333.34 | 844436.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 130.0 | 1356.94 | 818264.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 5783.0 | 1343.76 | 835704.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 6343.0 | 1347.15 | 829361.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 10967.0 | 1351.43 | 818394.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-09-28 | Hsing Michael | Director, Officer | S | 2949.0 | 1338.66 | 841487.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926012375/0001214659-26-012375-index.htm | | 2026-08-31 | Tseng Saria | Officer | G | 2000.0 | 0.0 | 142218.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926011363/0001214659-26-011363-index.htm | | 2026-08-31 | Tseng Saria | Officer | G | 2000.0 | 0.0 | 2000.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926011363/0001214659-26-011363-index.htm | | 2026-08-24 | DEAN ROBERT W II | Officer | S | 32.0 | 1297.72 | 7094.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926010932/0001214659-26-010932-index.htm | | 2026-08-24 | DEAN ROBERT W II | Officer | J | 5.0 | 0.0 | 7089.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926010932/0001214659-26-010932-index.htm | | 2026-08-24 | CHANG KUO WEI HERBERT | Director | S | 50.0 | 1281.57 | 515.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926010853/0001214659-26-010853-index.htm | | 2026-08-17 | DEAN ROBERT W II | Officer | S | 6.0 | 1413.64 | 7126.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926010630/0001214659-26-010630-index.htm | | 2026-08-11 | CHANG KUO WEI HERBERT | Director | S | 50.0 | 1420.0 | 565.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926010101/0001214659-26-010101-index.htm | | 2026-08-05 | DEAN ROBERT W II | Officer | S | 105.0 | 1344.27 | 7132.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926009739/0001214659-26-009739-index.htm | | 2026-08-04 | Sciammas Maurice | Officer | G | 25000.0 | 0.0 | 36062.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926009744/0001214659-26-009744-index.htm | | 2026-08-04 | Sciammas Maurice | Officer | G | 25000.0 | 0.0 | 126644.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926009744/0001214659-26-009744-index.htm | | 2026-08-03 | Sciammas Maurice | Officer | S | 30.0 | 1343.94 | 1119.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926009676/0001214659-26-009676-index.htm | | 2026-07-25 | DEAN ROBERT W II | Officer | A | 1359.0 | 0.0 | 7237.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926009117/0001214659-26-009117-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 240.0 | 1369.18 | 153434.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 472.0 | 1375.47 | 152962.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 418.0 | 1378.73 | 152544.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 410.0 | 1384.11 | 152134.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 1864.0 | 1344.16 | 160870.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 213.0 | 1396.16 | 151871.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 117.0 | 1400.45 | 151754.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 110.0 | 1405.71 | 151644.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 527.0 | 1314.03 | 166117.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 274.0 | 1318.42 | 165843.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 409.0 | 1323.93 | 165434.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 464.0 | 1329.3 | 164970.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 776.0 | 1334.59 | 164194.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 1460.0 | 1339.59 | 162734.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 50.0 | 1359.36 | 153674.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 5640.0 | 1352.95 | 153724.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 1506.0 | 1348.91 | 159364.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-15 | Sciammas Maurice | Officer | S | 50.0 | 1388.19 | 152084.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008703/0001214659-26-008703-index.htm | | 2026-07-01 | Sciammas Maurice | Officer | S | 30.0 | 1351.61 | 1149.0 | https://www.sec.gov/Archives/edgar/data/1280452/000121465926008236/0001214659-26-008236-index.htm | Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets --- Independent. 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