MPWRMONOLITHIC POWER SYSTEMS, INC.
Insider trading & SEC Form 4 activity — last 90 days. Latest filing: 2026-09-02.
Insider buys (90d)
$0.00
Insider sells (90d)
$20.65M
Net flow
$-20.65M
Filings
11
Buy transactions
0
Sell transactions
25
Distinct insiders
4
Last close (cached)
$1223.86
as of 2026-09-04
1d return
+0.8%
5d return
-2.6%
1m return
-9.9%
Top insiders trading MPWR (90d)
Recent transactions (31)
| Filed | Txn date | Insider | Code | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-02 | 2026-08-31 | Tseng Saria | Gift | 2,000 | $0.00 | $0.00 | open → |
| 2026-09-02 | 2026-08-31 | Tseng Saria | Gift | 2,000 | $0.00 | $0.00 | open → |
| 2026-08-26 | 2026-08-24 | DEAN ROBERT W II | Other | 5 | $0.00 | $0.00 | open → |
| 2026-08-26 | 2026-08-24 | DEAN ROBERT W II | Sale | 32 | $1297.72 | $41.5K | open → |
| 2026-08-25 | 2026-08-24 | CHANG KUO WEI HERBERT | Sale | 50 | $1281.57 | $64.1K | open → |
| 2026-08-20 | 2026-08-17 | DEAN ROBERT W II | Sale | 6 | $1413.64 | $8.5K | open → |
| 2026-08-13 | 2026-08-11 | CHANG KUO WEI HERBERT | Sale | 50 | $1420.00 | $71.0K | open → |
| 2026-08-07 | 2026-08-04 | Sciammas Maurice | Gift | 25,000 | $0.00 | $0.00 | open → |
| 2026-08-07 | 2026-08-04 | Sciammas Maurice | Gift | 25,000 | $0.00 | $0.00 | open → |
| 2026-08-06 | 2026-08-05 | DEAN ROBERT W II | Sale | 105 | $1344.27 | $141.1K | open → |
| 2026-08-05 | 2026-08-03 | Sciammas Maurice | Sale | 30 | $1343.94 | $40.3K | open → |
| 2026-07-28 | 2026-07-25 | DEAN ROBERT W II | Grant | 1,359 | $0.00 | $0.00 | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 110 | $1405.71 | $154.6K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 117 | $1400.45 | $163.9K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 213 | $1396.16 | $297.4K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 50 | $1388.19 | $69.4K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 410 | $1384.11 | $567.5K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 418 | $1378.73 | $576.3K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 472 | $1375.47 | $649.2K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 240 | $1369.18 | $328.6K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 50 | $1359.36 | $68.0K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 5,640 | $1352.95 | $7.63M | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 1,506 | $1348.91 | $2.03M | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 1,864 | $1344.16 | $2.51M | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 1,460 | $1339.59 | $1.96M | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 776 | $1334.59 | $1.04M | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 464 | $1329.30 | $616.8K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 409 | $1323.93 | $541.5K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 274 | $1318.42 | $361.2K | open → |
| 2026-07-17 | 2026-07-15 | Sciammas Maurice | Sale | 527 | $1314.03 | $692.5K | open → |
| 2026-07-06 | 2026-07-01 | Sciammas Maurice | Sale | 30 | $1351.61 | $40.5K | open → |
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