MPWRMonolithic Power Systems
Monolithic Power Systems, Inc. is a fabless global company that provides high-performance, semiconductor-based power electronics solutions. 10-K, Item 1
- Employees
- 4,501
- Headquarters
- West Palm Beach, FL
- CEO
- Michael Hsing
- Next results
- around Feb 4, 2027
What MPWR's directors and officers said they would sell, before they sold: trading plans the company reports each quarter, and the Form 144 notices sellers file on the day of a planned sale. Facts only; most of these sales are routine, such as selling shares from vesting stock awards.
Trading plans adopted or ended
1 plan still running: Saria Tseng.
| Insider | What | Date | Shares | Runs to | Reported in |
|---|---|---|---|---|---|
| Michael Hsing President, Chief Executive Officer and Director |
Ended 10b5-1 plan | Sep 28, 2026 | up to 60,000 | May 29, 2027 | 10-Q Nov 3, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Ended 10b5-1 plan | Aug 4, 2026 | up to 80,000 | May 19, 2027 | 10-Q Nov 3, 2026 |
| Maurice Sciammas Executive Vice President, Worldwide Sales and Marketing |
Ended 10b5-1 plan | Aug 4, 2026 | up to 42,000 | Dec 31, 2026 | 10-Q Nov 3, 2026 |
| Michael Hsing President, Chief Executive Officer and Director |
Adopted 10b5-1 plan | May 29, 2026 | up to 60,000 | May 29, 2027 | 10-Q Aug 5, 2026 |
| Saria Tseng Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary |
Adopted 10b5-1 plan | May 29, 2026 | up to 75,409 | May 29, 2027 | 10-Q Aug 5, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Adopted 10b5-1 plan | May 19, 2026 | up to 80,000 | May 19, 2027 | 10-Q Aug 5, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Ended 10b5-1 plan | May 6, 2026 | up to 120,000 | Feb 19, 2027 | 10-Q Aug 5, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Adopted 10b5-1 plan | Feb 20, 2026 | up to 120,000 | Feb 19, 2027 | 10-Q May 4, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Ended 10b5-1 plan | Feb 9, 2026 | up to 80,976 | Nov 13, 2026 | 10-Q May 4, 2026 |
| Michael Hsing President, Chief Executive Officer and Director |
Ended 10b5-1 plan | Dec 31, 2025 | up to 133,082 | – | 10-Q Nov 6, 2024 |
| Saria Tseng Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary |
Ended 10b5-1 plan | Dec 31, 2025 | up to 33,963 | – | 10-Q Nov 6, 2024 |
| Saria Tseng Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary |
Adopted 10b5-1 plan | Nov 28, 2025 | up to 43,673 | Nov 27, 2026 | 10-K Feb 27, 2026 |
| Maurice Sciammas Executive Vice President, Worldwide Sales and Marketing |
Adopted 10b5-1 plan | Nov 24, 2025 | up to 42,000 | Dec 31, 2026 | 10-K Feb 27, 2026 |
| Saria Tseng Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary |
Ended 10b5-1 plan | Nov 17, 2025 | up to 32,650 | Dec 31, 2025 | 10-K Feb 27, 2026 |
| Deming Xiao Executive Vice President, Global Operations |
Adopted 10b5-1 plan | Nov 13, 2025 | up to 80,976 | Nov 13, 2026 | 10-K Feb 27, 2026 |
| Maurice Sciammas Executive Vice President of Worldwide Sales and Marketing |
Ended 10b5-1 plan | Aug 29, 2025 | up to 19,000 | – | 10-Q Nov 6, 2024 |
| Michael Hsing President, Chief Executive Officer and Director |
Adopted 10b5-1 plan | Aug 28, 2025 | up to 100,000 | – | 10-Q Nov 5, 2025 |
| Victor K. Lee Director |
Adopted 10b5-1 plan | Aug 25, 2025 | up to 2,000 | – | 10-Q Nov 5, 2025 |
| Victor K. Lee Director |
Ended 10b5-1 plan | Aug 21, 2025 | up to 1,000 | – | 10-Q Nov 6, 2024 |
| Bernie Blegen Executive Vice President and Chief Financial Officer |
Ended plan | Aug 15, 2025 | up to 52,500 | – | 10-Q Nov 8, 2023 |
| Deming Xiao Executive Vice President, Global Operations |
Ended 10b5-1 plan | Aug 5, 2025 | up to 39,999 | – | 10-Q Nov 5, 2025 |
| Deming Xiao Executive Vice President, Global Operations |
Adopted 10b5-1 plan | Feb 28, 2025 | up to 160,000 | Feb 27, 2026 | 10-Q May 5, 2025 |
| Bernie Blegen Executive Vice President and Chief Financial Officer |
Adopted 10b5-1 plan | Feb 26, 2025 | up to 39,000 | Dec 31, 2026 | 10-Q May 5, 2025 |
| Michael Hsing President, Chief Executive Officer and Director |
Ended 10b5-1 plan | Feb 26, 2025 | up to 133,082 | Dec 31, 2025 | 10-Q May 5, 2025 |
| Deming Xiao President of Asia Operations |
Ended plan | Dec 31, 2024 | up to 138,180 | – | 10-Q Nov 8, 2023 |
| Maurice Sciammas Senior Vice President of Worldwide Sales and Marketing |
Ended plan | Dec 31, 2024 | up to 44,000 | – | 10-Q Nov 8, 2023 |
| Michael Hsing President, Chief Executive Officer and Director |
Ended plan | Dec 31, 2024 | up to 96,000 | – | 10-Q Nov 8, 2023 |
| Saria Tseng Executive Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary |
Adopted 10b5-1 plan | Feb 29, 2024 | up to 38,951 | Feb 28, 2025 | 10-Q May 3, 2024 |
| Victor K. Lee Director |
Adopted 10b5-1 plan | Feb 28, 2024 | up to 1,000 | Feb 28, 2025 | 10-Q May 3, 2024 |
| Deming Xiao Executive Vice President, Global Operations |
Ended 10b5-1 plan | Feb 12, 2024 | up to 138,180 | Dec 31, 2024 | 10-Q May 3, 2024 |
From the XBRL of the company's 10-Qs and 10-Ks (Regulation S-K Item 408, reported since 2023): 15 filings checked since May 5, 2023.
Form 144 notices of planned sales
| Filed | Seller | Shares | Value | Shares came from | 10b5-1 plan | Form 4 sales after |
|---|---|---|---|---|---|---|
| Sep 28, 2026 | MICHAEL HSING Officer, Director |
30,000 | $40,349,049 | Employee Stock Purchase Plan; Performance Shares | adopted May 29, 2026 | 30,000 shares from Sep 28, 2026 |
| Aug 24, 2026 | DEAN ROBERT W II Officer |
32 | $41,527 | Time-based restricted stock units | none given | 32 shares from Aug 24, 2026 |
| Aug 17, 2026 | DEAN ROBERT W II Officer |
6 | $8,128 | Time-based restricted stock units | none given | 38 shares from Aug 17, 2026 |
| Aug 11, 2026 | Kuo Wei Chang Director |
100 | $142,000 | RSU | none given | 100 shares from Aug 11, 2026 |
| Aug 5, 2026 | ROBERT DEAN Officer |
105 | $141,148 | Performance Shares | none given | 143 shares from Aug 5, 2026 |
| Jul 15, 2026 | MAURICE SCIAMMAS Officer |
15,000 | $20,245,944 | Restricted Stock | adopted Nov 24, 2025 | 15,030 shares from Jul 15, 2026 |
| Jun 1, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,001 | $4,625,868 | Performance Shares | adopted Feb 26, 2025 | none found |
| May 28, 2026 | SARIA TSENG Officer |
7,565 | $12,860,500 | Performance Shares | none given | none found |
| May 26, 2026 | JEFF ZHOU Director |
486 | $816,480 | Restricted Stock | none given | 486 shares from May 26, 2026 |
| May 26, 2026 | DEAN ROBERT W II Officer |
22 | $35,882 | Time-based restricted stock units | none given | 22 shares from May 26, 2026 |
| May 22, 2026 | SARIA TSENG Officer |
5,000 | $7,932,150 | Performance Shares | none given | 12,565 shares from May 22, 2026 |
| May 18, 2026 | MICHAEL HSING Officer, Director |
40,000 | $59,310,202 | Performance Shares | none given | 40,000 shares from May 18, 2026 |
| May 18, 2026 | DEAN ROBERT W II Officer |
4 | $6,253 | Time-based restricted stock units | none given | 26 shares from May 18, 2026 |
| May 15, 2026 | MAURICE SCIAMMAS Officer |
12,000 | $18,736,865 | Performance Shares | adopted Nov 24, 2025 | 12,030 shares from May 15, 2026 |
| May 6, 2026 | DEMING XIAO Officer |
30,000 | $49,636,545 | Performance Shares | none given | 30,000 shares from May 6, 2026 |
| May 6, 2026 | JEFF ZHOU Director |
500 | $825,000 | Restricted Stock | none given | 986 shares from May 6, 2026 |
| May 6, 2026 | EILEEN WYNNE Director |
335 | $530,196 | Restricted Stock | none given | 335 shares from May 6, 2026 |
| May 6, 2026 | Elmiger Eugen J Director |
12,000 | $19,828,200 | Restricted Stock Units | none given | 12,000 shares from May 6, 2026 |
| May 5, 2026 | Rosalind Sciammas Member of immediate family of any of the foregoing |
400 | $600,000 | GRAT Distribution | none given | none found |
| May 5, 2026 | JEFF ZHOU Director |
1,014 | $1,609,285 | Restricted Stock | none given | 2,000 shares from May 5, 2026 |
| May 1, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,000 | $4,638,875 | Performance Shares | adopted Feb 26, 2025 | none found |
| Apr 8, 2026 | SARIA TSENG Officer |
8,964 | $11,699,941 | Performance Shares | adopted Nov 28, 2025 | none found |
| Apr 6, 2026 | SARIA TSENG Officer |
7,636 | $8,918,429 | Performance Shares | adopted Nov 28, 2025 | none found |
| Apr 1, 2026 | SARIA TSENG Officer |
1,400 | $1,586,925 | Performance Shares | adopted Nov 28, 2025 | none found |
| Apr 1, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,000 | $3,343,034 | Performance Shares | adopted Feb 26, 2025 | none found |
| Mar 30, 2026 | SARIA TSENG Officer |
25,674 | $25,943,648 | Performance Shares | adopted Nov 28, 2025 | none found |
| Mar 20, 2026 | Sciammas Maurice Officer |
120 | $131,333 | Gift | adopted Nov 19, 2025 | none found |
| Mar 2, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,000 | $3,349,516 | Performance Shares | adopted Feb 26, 2025 | none found |
| Feb 12, 2026 | MICHAEL HSING Officer, Director |
33,000 | $38,670,192 | Performance Shares | adopted Aug 28, 2025 | none found |
| Feb 11, 2026 | MICHAEL HSING Officer, Director |
33,000 | $39,234,172 | Performance Shares | adopted Aug 28, 2025 | none found |
| Feb 10, 2026 | The Sciammas Trust DTD 06/08/2018 Member of immediate family of any of the foregoing |
200 | $240,000 | GRAT Distribution | none given | none found |
| Feb 10, 2026 | MICHAEL HSING Officer, Director |
34,000 | $38,837,374 | Performance Shares | adopted Aug 28, 2025 | none found |
| Feb 6, 2026 | BLEGEN THEODORE Officer |
995 | $1,165,304 | Performance-based restricted stock units | none given | none found |
| Feb 6, 2026 | Sciammas Maurice Officer |
1,286 | $1,505,526 | Performance-based restricted stock units | none given | none found |
| Feb 6, 2026 | Tseng Saria Officer |
1,286 | $1,505,526 | Performance-based restricted stock units | none given | none found |
| Feb 6, 2026 | Hsing Michael Officer, Director |
3,082 | $3,609,222 | Performance-based restricted stock units | none given | none found |
| Feb 6, 2026 | Xiao Deming Officer |
1,286 | $1,505,526 | Performance-based restricted stock units | none given | none found |
| Feb 4, 2026 | BLEGEN THEODORE Officer |
20,730 | $24,146,926 | Performance-based restricted stock units | none given | none found |
| Feb 4, 2026 | Sciammas Maurice Officer |
21,590 | $25,148,680 | Performance-based restricted stock units | none given | none found |
| Feb 4, 2026 | Tseng Saria Officer |
21,590 | $25,148,680 | Performance-based restricted stock units | none given | none found |
| Feb 4, 2026 | Hsing Michael Officer, Director |
51,841 | $60,385,952 | Performance-based restricted stock units | none given | none found |
| Feb 4, 2026 | Xiao Deming Officer |
21,590 | $25,148,680 | Performance-based restricted stock units | none given | none found |
| Feb 2, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,000 | $3,389,270 | Performance Shares | adopted Feb 26, 2025 | none found |
| Jan 2, 2026 | THEODORE BERNHARD BLEGEN Officer |
3,000 | $2,821,403 | Performance Shares | adopted Feb 26, 2025 | none found |
| Dec 29, 2025 | VICTOR LEE Director |
2,000 | $1,887,100 | Restricted Stock Units | adopted Aug 25, 2025 | none found |
| Dec 1, 2025 | BERNIE BLEGEN Officer |
3,000 | $2,724,621 | Performance Shares | adopted Feb 26, 2025 | none found |
| Nov 26, 2025 | SARIA TSENG Officer |
20,000 | $18,529,267 | Performance Shares | none given | none found |
| Nov 25, 2025 | SARIA TSENG Officer |
20,000 | $18,083,614 | Performance Shares | none given | none found |
| Nov 24, 2025 | MAURICE SCIAMMAS Officer |
3,976 | $3,559,434 | Performance Shares | none given | none found |
| Nov 21, 2025 | Kuo Wei Chang Director |
200 | $169,240 | RSU | none given | none found |
| Nov 19, 2025 | MAURICE SCIAMMAS Officer |
35,000 | $30,777,406 | Performance Shares | none given | none found |
| Nov 12, 2025 | Michael Hsing Officer, Director |
30,000 | $28,958,826 | Performance Shares | none given | none found |
| Nov 12, 2025 | Michael Hsing Officer, Director |
40,000 | $38,335,752 | Performance Shares | none given | none found |
| Nov 12, 2025 | Hsing Michael Officer, Director |
7,000 | $6,749,470 | Restricted Stock Units | none given | none found |
| Nov 4, 2025 | The Sciammas Trust DTD 06/08/2018 Member of immediate family of any of the foregoing |
200 | $194,000 | GRAT DISTRIBUTION | none given | none found |
| Nov 3, 2025 | BERNIE BLEGEN Officer |
3,000 | $3,073,277 | Performance Shares | adopted Feb 26, 2025 | none found |
| Oct 30, 2025 | BLEGEN THEODORE Officer |
1,077 | $1,181,071 | Performance-based restricted stock units | none given | none found |
| Oct 30, 2025 | Sciammas Maurice Officer |
1,216 | $1,333,502 | Performance-based restricted stock units | none given | none found |
| Oct 30, 2025 | Tseng Saria Officer |
1,216 | $1,333,502 | Performance-based restricted stock units | none given | none found |
| Oct 30, 2025 | Hsing Michael Officer, Director |
2,718 | $2,980,640 | Performance-based restricted stock units | none given | none found |
| Oct 30, 2025 | Xiao Deming Officer |
1,216 | $1,333,502 | Performance-based restricted stock units | none given | none found |
| Oct 28, 2025 | BLEGEN THEODORE Officer |
47,222 | $52,182,671 | Performance-based restricted stock units | none given | none found |
| Oct 28, 2025 | Sciammas Maurice Officer |
53,328 | $58,930,106 | Performance-based restricted stock units | none given | none found |
| Oct 28, 2025 | Tseng Saria Officer |
53,328 | $58,930,106 | Performance-based restricted stock units | none given | none found |
| Oct 28, 2025 | Hsing Michael Officer, Director |
302,920 | $334,741,746 | Performance-based restricted stock units | none given | none found |
| Oct 28, 2025 | Xiao Deming Officer |
53,328 | $58,930,106 | Performance-based restricted stock units | none given | none found |
| Oct 24, 2025 | SARIA TSENG Officer |
1,301 | $1,414,994 | Performance Shares | adopted Aug 30, 2024 | none found |
From the Form 144 XML filed with the SEC, since Oct 24, 2025. The value is the seller's estimate on the notice. "Form 4 sales after" matches the seller's Form 4 sales in the 30 days after the notice, by name; Form 4s go back 180 days.
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