Dudediligence.

Monolithic Power Systems, Inc

MPWRNASDAQ · Semiconductors & Related Devices
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Last 12 months

Sales planned on beside the trades reported on , and whether each names a .

Planned ·

$1.33B

69 notices · 1,161,926 sh

Oct 2025 to Oct 2026

Reported ·

$685.3M

284 sales · 0 buys

Oct 2025 to Jun 2026

The two figures cover different periods.

150 of 284 reported sales carry the 10b5-1 box. Together they are 1.19% of the shares on issue.

PLANNED · FORM 144Oct 2025 to Oct 2026REPORTED · FORM 4Oct 2025 to Jun 2026N2025DJ2026FMAMJJASO2026-09-28: MICHAEL HSING, Form 1442026-08-24: DEAN ROBERT W II, Form 1442026-08-17: DEAN ROBERT W II, Form 1442026-08-11: Kuo Wei Chang, Form 1442026-08-05: ROBERT DEAN, Form 1442026-07-15: MAURICE SCIAMMAS, Form 1442026-06-01: THEODORE BERNHARD BLEGEN, Form 1442026-05-27: SARIA TSENG, Form 1442026-05-26: JEFF ZHOU, Form 1442026-05-26: DEAN ROBERT W II, Form 1442026-05-22: SARIA TSENG, Form 1442026-05-18: MICHAEL HSING, Form 1442026-05-18: DEAN ROBERT W II, Form 1442026-05-15: MAURICE SCIAMMAS, Form 1442026-05-06: DEMING XIAO, Form 1442026-05-06: JEFF ZHOU, Form 1442026-05-06: EILEEN WYNNE, Form 1442026-05-07: Elmiger Eugen J, Form 1442026-05-05: Rosalind Sciammas, Form 1442026-05-05: JEFF ZHOU, Form 1442026-05-01: THEODORE BERNHARD BLEGEN, Form 1442026-04-08: SARIA TSENG, Form 1442026-04-06: SARIA TSENG, Form 1442026-04-01: SARIA TSENG, Form 1442026-04-01: THEODORE BERNHARD BLEGEN, Form 1442026-03-30: SARIA TSENG, Form 1442026-03-20: Sciammas Maurice, Form 1442026-03-02: THEODORE BERNHARD BLEGEN, Form 1442026-02-12: MICHAEL HSING, Form 1442026-02-11: MICHAEL HSING, Form 1442026-02-10: The Sciammas Trust DTD 06/08/2018, Form 1442026-02-10: MICHAEL HSING, Form 1442026-02-06: BLEGEN THEODORE, Form 1442026-02-06: Sciammas Maurice, Form 1442026-02-06: Tseng Saria, Form 1442026-02-06: Hsing Michael, Form 1442026-02-06: Xiao Deming, Form 1442026-02-04: BLEGEN THEODORE, Form 1442026-02-04: Sciammas Maurice, Form 1442026-02-04: Tseng Saria, Form 1442026-02-04: Hsing Michael, Form 1442026-02-04: Xiao Deming, Form 1442026-02-02: THEODORE BERNHARD BLEGEN, Form 1442026-01-02: THEODORE BERNHARD BLEGEN, Form 1442025-12-24: VICTOR LEE, Form 1442025-12-01: BERNIE BLEGEN, Form 1442025-11-26: SARIA TSENG, Form 1442025-11-25: SARIA TSENG, Form 1442025-11-24: MAURICE SCIAMMAS, Form 1442025-11-21: Kuo Wei Chang, Form 1442025-11-19: MAURICE SCIAMMAS, Form 1442025-11-12: Michael Hsing, Form 1442025-11-11: Michael Hsing, Form 1442025-11-12: Hsing Michael, Form 1442025-11-05: The Sciammas Trust DTD 06/08/2018, Form 1442025-11-03: BERNIE BLEGEN, Form 1442025-10-30: BLEGEN THEODORE, Form 1442025-10-30: Sciammas Maurice, Form 1442025-10-30: Tseng Saria, Form 1442025-10-30: Hsing Michael, Form 1442025-10-30: Xiao Deming, Form 1442025-10-28: BLEGEN THEODORE, Form 1442025-10-28: Sciammas Maurice, Form 1442025-10-28: Tseng Saria, Form 1442025-10-28: Hsing Michael, Form 1442025-10-28: Xiao Deming, Form 1442025-10-24: SARIA TSENG, Form 1442025-10-16: SARIA TSENG, Form 1442025-10-15: SARIA TSENG, Form 1442025-10-15: Tseng Saria, sold2025-10-24: Tseng Saria, sold2025-11-03: BLEGEN THEODORE, sold2025-11-05: Sciammas Maurice, sold2025-11-11: Hsing Michael, sold2025-11-12: Hsing Michael, sold2025-11-19: Sciammas Maurice, sold2025-11-19: Sciammas Maurice, sold2025-11-21: CHANG KUO WEI HERBERT, sold2025-11-24: Sciammas Maurice, sold2025-11-25: CHANG KUO WEI HERBERT, sold2025-11-25: Tseng Saria, sold2025-11-26: Tseng Saria, sold2025-12-01: BLEGEN THEODORE, sold2025-12-24: Lee Victor K, sold2026-01-02: BLEGEN THEODORE, sold2026-01-02: Lee Victor K, sold2026-02-02: BLEGEN THEODORE, sold2026-02-06: Hsing Michael, sold2026-02-06: BLEGEN THEODORE, sold2026-02-06: Sciammas Maurice, sold2026-02-06: Tseng Saria, sold2026-02-06: Xiao Deming, sold2026-02-09: Lee Victor K, sold2026-02-10: Hsing Michael, sold2026-02-11: Sciammas Maurice, sold2026-02-11: Hsing Michael, sold2026-02-12: Hsing Michael, sold2026-03-20: Sciammas Maurice, sold2026-03-30: Tseng Saria, sold2026-04-01: Sciammas Maurice, sold2026-04-01: Tseng Saria, sold2026-04-06: Tseng Saria, sold2026-04-08: Tseng Saria, sold2026-05-04: Sciammas Maurice, sold2026-05-05: Sciammas Maurice, sold2026-05-05: Zhou Jeff, sold2026-05-06: Wynne Eileen, sold2026-05-06: Xiao Deming, sold2026-05-06: Elmiger Eugen J, sold2026-05-15: Sciammas Maurice, sold2026-05-18: DEAN ROBERT W II, sold2026-05-18: Hsing Michael, sold2026-05-22: Tseng Saria, sold2026-05-26: Zhou Jeff, sold2026-05-26: DEAN ROBERT W II, sold2026-05-27: Tseng Saria, sold2026-06-01: Sciammas Maurice, sold
under a no plan named▼ salesize is dollars

Form 144 notices, newest first

2026-09-28MICHAEL HSING, CEO$40.3M
30,000 shplan 2026-05-29Form 4s on file end Jun 23144 ↗
2026-08-24DEAN ROBERT W II, Interim CFO$41,527
32 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-17DEAN ROBERT W II, Interim CFO$8,128
6 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-11Kuo Wei Chang, Director$142,000
100 shno plan dateForm 4s on file end Jun 23144 ↗
2026-08-05ROBERT DEAN, Interim CFO$141,148
105 shno plan dateForm 4s on file end Jun 23144 ↗
2026-07-15MAURICE SCIAMMAS, EVP, WW Sales & Marketing$20.2M
15,000 shplan 2025-11-24Form 4s on file end Jun 23144 ↗
2026-06-01THEODORE BERNHARD BLEGEN, EVP and CFO$4,625,868
3,001 shplan 2025-02-26Form 4s on file end Jun 23144 ↗
2026-05-27SARIA TSENG, EVP & General Counsel$12.9M
7,565 shplan 2025-11-28144 ↗
Form 4, 2026-05-29: sold 7,565 at $1700.00 Form 4 ↗
2026-05-26JEFF ZHOU, Director$816,480
486 shno plan date144 ↗
Form 4, 2026-05-27: sold 486 at $1680.00 Form 4 ↗
2026-05-26DEAN ROBERT W II, Interim CFO$35,882
22 shno plan date144 ↗
Form 4, 2026-05-28: sold 22 at $1649.56 Form 4 ↗
2026-05-22SARIA TSENG, EVP & General Counsel$7,932,150
5,000 shplan 2025-11-28144 ↗
Form 4, 2026-05-27: sold 5,000 at $1586.43 Form 4 ↗
2026-05-18MICHAEL HSING, CEO$59.3M
40,000 shplan 2025-08-28144 ↗
Form 4, 2026-05-20: sold 40,000 at $1482.75 Form 4 ↗
2026-05-18DEAN ROBERT W II, Interim CFO$6,253
4 shno plan date144 ↗
Form 4, 2026-05-20: sold 4 at $1563.28 Form 4 ↗
2026-05-15MAURICE SCIAMMAS, EVP, WW Sales & Marketing$18.7M
12,000 shplan 2025-11-24144 ↗
Form 4, 2026-05-19: sold 12,000 at $1561.40 Form 4 ↗
2026-05-07Elmiger Eugen J, Director$19.8M
12,000 shno plan date144 ↗
Form 4, 2026-05-08: sold 12,000 at $1584.96 Form 4 ↗
2026-05-06DEMING XIAO, EVP, Global Operations$49.6M
30,000 shplan 2026-02-20144 ↗
Form 4, 2026-05-08: sold 30,000 at $1654.55 Form 4 ↗
2026-05-06JEFF ZHOU, Director$825,000
500 shno plan dateForm 4s on file end Jun 23144 ↗
2026-05-06EILEEN WYNNE, Director$530,196
335 shno plan date144 ↗
Form 4, 2026-05-08: sold 335 at $1582.68 Form 4 ↗
2026-05-05Rosalind Sciammas, EVP, WW Sales & Marketing$600,000
400 shplan 2025-11-24144 ↗
Form 4, 2026-05-06: sold 380 at $1583.81 Form 4 ↗
2026-05-05JEFF ZHOU, Director$1,609,285
1,014 shno plan date144 ↗
Form 4, 2026-05-06: sold 1,514 at $1607.85 Form 4 ↗
2026-05-01THEODORE BERNHARD BLEGEN, EVP and CFO$4,638,875
3,000 shplan 2025-02-26Form 4s on file end Jun 23144 ↗
2026-04-08SARIA TSENG, EVP & General Counsel$11.7M
8,964 shplan 2025-11-28144 ↗
Form 4, 2026-04-10: sold 8,963 at $1305.22 Form 4 ↗
2026-04-06SARIA TSENG, EVP & General Counsel$8,918,429
7,636 shplan 2025-11-28144 ↗
Form 4, 2026-04-08: sold 7,636 at $1167.95 Form 4 ↗
2026-04-01SARIA TSENG, EVP & General Counsel$1,586,925
1,400 shplan 2025-11-28144 ↗
Form 4, 2026-04-03: sold 1,400 at $1133.52 Form 4 ↗
2026-04-01THEODORE BERNHARD BLEGEN, EVP and CFO$3,343,034
3,000 shplan 2025-02-26Form 4s on file end Jun 23144 ↗
2026-03-30SARIA TSENG, EVP & General Counsel$25.9M
25,674 shplan 2025-11-28144 ↗
Form 4, 2026-04-01: sold 25,674 at $1010.50 Form 4 ↗
2026-03-20Sciammas Maurice, EVP, WW Sales & Marketing$131,333
120 shplan 2025-11-19144 ↗
Form 4, 2026-03-24: sold 30 at $1095.07 Form 4 ↗
2026-03-02THEODORE BERNHARD BLEGEN, EVP and CFO$3,349,517
3,000 shplan 2025-02-26no Form 4 on file144 ↗
2026-02-12MICHAEL HSING, CEO$38.7M
33,000 shplan 2025-08-28144 ↗
Form 4, 2026-02-17: sold 33,000 at $1171.83 Form 4 ↗
2026-02-11MICHAEL HSING, CEO$39.2M
33,000 shplan 2025-08-28144 ↗
Form 4, 2026-02-13: sold 33,000 at $1188.92 Form 4 ↗
2026-02-10The Sciammas Trust DTD 06/08/2018, EVP, WW Sales & Marketing$240,000
200 shplan 2025-11-24144 ↗
Form 4, 2026-02-12: sold 200 at $1179.98 Form 4 ↗
2026-02-10MICHAEL HSING, CEO$38.8M
34,000 shplan 2025-08-28144 ↗
Form 4, 2026-02-12: sold 34,000 at $1142.28 Form 4 ↗
2026-02-06BLEGEN THEODORE, EVP and CFO$1,165,304
995 shno plan date144 ↗
Form 4, 2026-02-10: sold 21,725 at $1171.16 Form 4 ↗
2026-02-06Sciammas Maurice, EVP, WW Sales & Marketing$1,505,526
1,286 shplan 2025-11-24144 ↗
Form 4, 2026-02-10: sold 22,875 at $1171.16 Form 4 ↗
2026-02-06Tseng Saria, EVP & General Counsel$1,505,526
1,286 shplan 2025-11-28144 ↗
Form 4, 2026-02-10: sold 22,875 at $1171.16 Form 4 ↗
2026-02-06Hsing Michael, CEO$3,609,222
3,082 shplan 2025-08-28144 ↗
Form 4, 2026-02-10: sold 54,923 at $1171.16 Form 4 ↗
2026-02-06Xiao Deming, EVP, Global Operations$1,505,526
1,286 shplan 2025-11-13144 ↗
Form 4, 2026-02-10: sold 22,875 at $1171.16 Form 4 ↗
2026-02-04BLEGEN THEODORE, EVP and CFO$24.1M
20,730 shno plan dateno Form 4 on file144 ↗
2026-02-04Sciammas Maurice, EVP, WW Sales & Marketing$25.1M
21,590 shplan 2025-11-24no Form 4 on file144 ↗
2026-02-04Tseng Saria, EVP & General Counsel$25.1M
21,590 shplan 2025-11-28no Form 4 on file144 ↗
2026-02-04Hsing Michael, CEO$60.4M
51,841 shplan 2025-08-28no Form 4 on file144 ↗
2026-02-04Xiao Deming, EVP, Global Operations$25.1M
21,590 shplan 2025-11-13no Form 4 on file144 ↗
2026-02-02THEODORE BERNHARD BLEGEN, EVP and CFO$3,389,270
3,000 shplan 2025-02-26144 ↗
Form 4, 2026-02-04: sold 3,000 at $1129.76 Form 4 ↗
2026-01-02THEODORE BERNHARD BLEGEN, EVP and CFO$2,821,403
3,000 shplan 2025-02-26144 ↗
Form 4, 2026-01-06: sold 3,000 at $940.47 Form 4 ↗
2025-12-24VICTOR LEE, Director$1,887,100
2,000 shplan 2025-08-25144 ↗
Form 4, 2025-12-29: sold 1,000 at $951.72 Form 4 ↗
2025-12-01BERNIE BLEGEN, EVP and CFO$2,724,621
3,000 shplan 2025-02-26144 ↗
Form 4, 2025-12-02: sold 3,000 at $908.21 Form 4 ↗
2025-11-26SARIA TSENG, EVP & General Counsel$18.5M
20,000 shno plan date144 ↗
Form 4, 2025-11-28: sold 20,000 at $926.47 Form 4 ↗
2025-11-25SARIA TSENG, EVP & General Counsel$18.1M
20,000 shno plan date144 ↗
Form 4, 2025-11-28: sold 20,000 at $904.18 Form 4 ↗
2025-11-24MAURICE SCIAMMAS, EVP, WW Sales & Marketing$3,559,434
3,976 shplan 2025-11-24144 ↗
Form 4, 2025-11-25: sold 3,976 at $895.23 Form 4 ↗
2025-11-21Kuo Wei Chang, Director$169,240
200 shno plan date144 ↗
Form 4, 2025-11-24: sold 100 at $873.97 Form 4 ↗
2025-11-19MAURICE SCIAMMAS, EVP, WW Sales & Marketing$30.8M
35,000 shno plan date144 ↗
Form 4, 2025-11-20: sold 7,034 at $870.21 Form 4 ↗
2025-11-12Michael Hsing, CEO$29.0M
30,000 shplan 2025-08-28144 ↗
Form 4, 2025-11-13: sold 37,000 at $965.52 Form 4 ↗
2025-11-12Hsing Michael, CEO$6,749,470
7,000 shplan 2025-08-28no Form 4 on file144 ↗
2025-11-11Michael Hsing, CEO$38.3M
40,000 shplan 2025-08-28144 ↗
Form 4, 2025-11-13: sold 40,000 at $958.39 Form 4 ↗
2025-11-05The Sciammas Trust DTD 06/08/2018, EVP, WW Sales & Marketing$194,000
200 shno plan date144 ↗
Form 4, 2025-11-06: sold 200 at $986.81 Form 4 ↗
2025-11-03BERNIE BLEGEN, EVP and CFO$3,073,277
3,000 shplan 2025-02-26144 ↗
Form 4, 2025-11-04: sold 3,000 at $1024.43 Form 4 ↗
2025-10-30BLEGEN THEODORE, EVP and CFO$1,181,071
1,077 shno plan dateno Form 4 on file144 ↗
2025-10-30Sciammas Maurice, EVP, WW Sales & Marketing$1,333,502
1,216 shno plan dateno Form 4 on file144 ↗
2025-10-30Tseng Saria, EVP & General Counsel$1,333,502
1,216 shno plan dateno Form 4 on file144 ↗
2025-10-30Hsing Michael, CEO$2,980,640
2,718 shplan 2025-08-28no Form 4 on file144 ↗
2025-10-30Xiao Deming, EVP, Global Operations$1,333,502
1,216 shno plan dateno Form 4 on file144 ↗
2025-10-28BLEGEN THEODORE, EVP and CFO$52.2M
47,222 shno plan dateno Form 4 on file144 ↗
2025-10-28Sciammas Maurice, EVP, WW Sales & Marketing$58.9M
53,328 shno plan dateno Form 4 on file144 ↗
2025-10-28Tseng Saria, EVP & General Counsel$58.9M
53,328 shno plan dateno Form 4 on file144 ↗
2025-10-28Hsing Michael, CEO$334.7M
302,920 shplan 2025-08-28no Form 4 on file144 ↗
2025-10-28Xiao Deming, EVP, Global Operations$58.9M
53,328 shno plan dateno Form 4 on file144 ↗
2025-10-24SARIA TSENG, EVP & General Counsel$1,414,994
1,301 shplan 2024-08-30144 ↗
Form 4, 2025-10-24: sold 1,300 at $1087.62 Form 4 ↗
2025-10-16SARIA TSENG, EVP & General Counsel$2,884,322
2,812 shplan 2024-08-30no Form 4 on file144 ↗
2025-10-15SARIA TSENG, EVP & General Counsel$14.3M
14,028 shplan 2024-08-30144 ↗
Form 4, 2025-10-17: sold 16,840 at $1017.77 Form 4 ↗