Monolithic Power Systems, Inc (MPWR) insider trading
Every open-market stock purchase and sale by Monolithic Power Systems, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Michael Hsing (CEO) and 3 others sold $40.7M in the last 90 days.
- No open-market insider buys on record.
- Congress: Byron Donalds sold $1K to $15K, 5 months ago.
Last 12 months: insiders bought $0 (0 buys) and sold $725M (56 sales). Last close $1,283 on Oct 21, 2026.
Recent MPWR insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $14.8M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $8.5M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $7.8M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $3.9M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $2.8M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $1.5M |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $789K |
| Sep 28, 2026 | Michael Hsing (CEO) | Sold | $176K |
| Aug 31, 2026 | Saria Tseng (VP) | Bought (not open market) | — |
| Aug 31, 2026 | Saria Tseng (VP) | Sold (not open market) | — |
| Aug 24, 2026 | Kuo Wei Herbert Chang (Insider) | Sold | $64.1K |
| Aug 24, 2026 | Robert W Dean II (CFO) | Sold | $41.5K |
| Aug 24, 2026 | Robert W Dean II (CFO) | Sold (not open market) | — |
| Aug 17, 2026 | Robert W Dean II (CFO) | Sold | $8.5K |
| Aug 11, 2026 | Kuo Wei Herbert Chang (Insider) | Sold | $71K |
| Aug 5, 2026 | Robert W Dean II (CFO) | Sold | $141K |
| Aug 4, 2026 | Maurice Sciammas (VP) | Sold (not open market) | — |
| Aug 4, 2026 | Maurice Sciammas (VP) | Bought (not open market) | — |
| Aug 3, 2026 | Maurice Sciammas (VP) | Sold | $40.3K |
| Jul 25, 2026 | Robert W Dean II (CFO) | Bought (not open market) | — |
| Jul 15, 2026 | Maurice Sciammas (VP) | Sold | $7.6M |
| Jul 15, 2026 | Maurice Sciammas (VP) | Sold | $2.5M |
| Jul 15, 2026 | Maurice Sciammas (VP) | Sold | $2M |
| Jul 15, 2026 | Maurice Sciammas (VP) | Sold | $2M |
| Jul 15, 2026 | Maurice Sciammas (VP) | Sold | $1M |
Who's trading MPWR
- Michael Hsing, CEO: sold $353M (87 sales), last Sep 28, 2026
- Saria Tseng, VP: sold $133M (61 sales), last Aug 31, 2026
- Kuo Wei Herbert Chang, Insider: sold $312K (4 sales), last Aug 24, 2026
- Robert W Dean II, CFO: sold $234K (5 sales), last Aug 24, 2026
- Maurice Sciammas, VP: sold $101M (61 sales), last Aug 4, 2026
- Byron Donalds, Representative: sold $16K (2 sales), last Jun 5, 2026
- Jeff Zhou, Insider: sold $3.3M (4 sales), last May 26, 2026
- Deming Xiao, VP: sold $76.4M (5 sales), last May 6, 2026
- Eileen Wynne, Insider: sold $530K (1 sale), last May 6, 2026
- Eugen J Elmiger, Insider: sold $19M (9 sales), last May 6, 2026
- Victor K Lee, Insider: sold $2M (8 sales), last Feb 9, 2026
- Theodore Blegen, CFO: sold $36.1M (47 sales), last Feb 6, 2026
- Carintia Martinez, Insider: other filings, last Feb 3, 2026
Get free alerts when an insider at Monolithic Power Systems, Inc files a new trade →