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)
DateInsiderTypeSharesPrice
Jun 3, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell30$1533.95
May 29, 2026Tseng Sariaofficer: EVP & General CounselSell7,565$1700.00
May 28, 2026DEAN ROBERT W IIofficer: Interim CFOSell22$1649.56
May 27, 2026Zhou JeffdirectorSell486$1680.00
May 27, 2026Tseng Sariaofficer: EVP & General CounselSell5,000$1586.43
May 20, 2026DEAN ROBERT W IIofficer: Interim CFOSell4$1563.28
May 20, 2026Hsing Michaeldirector, officer: CEOSell4,082$1476.96
May 20, 2026Hsing Michaeldirector, officer: CEOSell5,737$1482.51
May 20, 2026Hsing Michaeldirector, officer: CEOSell5,819$1467.62
May 20, 2026Hsing Michaeldirector, officer: CEOSell352$1518.15
May 20, 2026Hsing Michaeldirector, officer: CEOSell3,769$1507.70
May 20, 2026Hsing Michaeldirector, officer: CEOSell608$1499.46
May 20, 2026Hsing Michaeldirector, officer: CEOSell3,424$1462.61
May 20, 2026Hsing Michaeldirector, officer: CEOSell5,049$1472.84
May 20, 2026Hsing Michaeldirector, officer: CEOSell130$1521.43
May 20, 2026Hsing Michaeldirector, officer: CEOSell551$1513.11
May 20, 2026Hsing Michaeldirector, officer: CEOSell862$1491.48
May 20, 2026Hsing Michaeldirector, officer: CEOSell2,929$1503.05
May 20, 2026Hsing Michaeldirector, officer: CEOSell6,688$1486.76
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell3,741$1550.36
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell447$1582.21
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell50$1585.51
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell2,020$1567.15
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell703$1577.75
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell1,312$1571.49
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell2,010$1562.01
May 19, 2026Sciammas Mauriceofficer: EVP, WW Sales & MarketingSell1,717$1557.48
May 8, 2026Elmiger Eugen JdirectorSell834$1575.57
May 8, 2026Xiao Demingofficer: EVP, Global OperationsSell11,597$1657.93
May 8, 2026Elmiger Eugen JdirectorSell1,355$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
InstitutionActionSharesFiled
BLACKROCK, INC.Increased6.1MMay 13, 2026
VANGUARD GROUP INCReduced6.0MJan 29, 2026
BLACKROCK, INC.Increased6.0MFeb 12, 2026
FMR LLCIncreased4.4MMay 15, 2026
FMR LLCIncreased4.0MFeb 17, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position3.1MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position2.5MMay 8, 2026
STATE STREET CORPIncreased2.2MMay 15, 2026
STATE STREET CORPIncreased2.2MFeb 13, 2026
PRICE T ROWE ASSOCIATES INC /MD/Increased1.7MFeb 17, 2026
INVESCO LTD.Increased1.5MMay 12, 2026
INVESCO LTD.Increased1.4MFeb 19, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased1.4MMay 15, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased1.4MFeb 9, 2026
PRICE T ROWE ASSOCIATES INC /MD/Reduced1.3MMay 15, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.