Monolithic Power Systems, Inc. (MPWR) Insider Trading
Over the last 3 months, MPWR insiders made 0 open-market buys and 77 sales, a net sale of -$219.2M (SEC Form 4). Over the last 6 months, 836 institutions increased and 781 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
77
Net (3m)
-$219.2M
Insider trades by month Buys Sells
Jan
Feb
Mar
Apr
May
Jun
Context3-month price +53.8%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 3, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 30 | $1533.95 |
| May 29, 2026 | Tseng Sariaofficer: EVP & General Counsel | Sell | 7,565 | $1700.00 |
| May 28, 2026 | DEAN ROBERT W IIofficer: Interim CFO | Sell | 22 | $1649.56 |
| May 27, 2026 | Zhou Jeffdirector | Sell | 486 | $1680.00 |
| May 27, 2026 | Tseng Sariaofficer: EVP & General Counsel | Sell | 5,000 | $1586.43 |
| May 20, 2026 | DEAN ROBERT W IIofficer: Interim CFO | Sell | 4 | $1563.28 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 4,082 | $1476.96 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 5,737 | $1482.51 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 5,819 | $1467.62 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 352 | $1518.15 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 3,769 | $1507.70 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 608 | $1499.46 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 3,424 | $1462.61 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 5,049 | $1472.84 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 130 | $1521.43 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 551 | $1513.11 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 862 | $1491.48 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 2,929 | $1503.05 |
| May 20, 2026 | Hsing Michaeldirector, officer: CEO | Sell | 6,688 | $1486.76 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 3,741 | $1550.36 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 447 | $1582.21 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 50 | $1585.51 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 2,020 | $1567.15 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 703 | $1577.75 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 1,312 | $1571.49 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 2,010 | $1562.01 |
| May 19, 2026 | Sciammas Mauriceofficer: EVP, WW Sales & Marketing | Sell | 1,717 | $1557.48 |
| May 8, 2026 | Elmiger Eugen Jdirector | Sell | 834 | $1575.57 |
| May 8, 2026 | Xiao Demingofficer: EVP, Global Operations | Sell | 11,597 | $1657.93 |
| May 8, 2026 | Elmiger Eugen Jdirector | Sell | 1,355 | $1591.38 |
Source: MPWR SEC Form 4 filings, latest Jun 3, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MPWR positions over the last 6 months (SEC Form 13F).
Increased
836
New positions
334
Reduced
781
Sold out
193
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 6.1M | May 13, 2026 |
| VANGUARD GROUP INC | Reduced | 6.0M | Jan 29, 2026 |
| BLACKROCK, INC. | Increased | 6.0M | Feb 12, 2026 |
| FMR LLC | Increased | 4.4M | May 15, 2026 |
| FMR LLC | Increased | 4.0M | Feb 17, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 3.1M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 2.5M | May 8, 2026 |
| STATE STREET CORP | Increased | 2.2M | May 15, 2026 |
| STATE STREET CORP | Increased | 2.2M | Feb 13, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 1.7M | Feb 17, 2026 |
| INVESCO LTD. | Increased | 1.5M | May 12, 2026 |
| INVESCO LTD. | Increased | 1.4M | Feb 19, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.4M | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.4M | Feb 9, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 1.3M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.