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Investment Visual

MPWR

Monolithic Power Systems, Inc.

$1,390.54−56.86 (−3.93%)Close Nov 13, 2026

Backtest MPWR

Insider trading

12 months to Nov 5, 2026
Sold
$724M
11 insiders
Largest seller
$355M
Michael Hsing · 49% of sales
Plan sales
$255M
35% of sales
Latest buy
None
Since 2004

Buys and sales on the price

Since 2004

By period

Open-market trades
Trades3 months12 monthsSince 2004
Buys000
Sales5542,289
Plan sales122902
Shares bought000000
Shares sold30,13830.1K611,051611K19,040,81019.0M
Net shares−30,138−30.1K−611,051−611K−19,040,810−19.0M
Net value−$40.5M−$724M−$2.61B

Insiders

Insider12 monthsShares held
Michael Hsing
CEO, Director
−26.4%
964,129
Maurice Sciammas
EVP, WW Sales & Marketing
−27.2%
256,410
Deming Xiao
EVP, Global Operations
−23.4%
230,750
Saria Tseng
EVP & General Counsel
−57.5%
145,218
Theodore Blegen
EVP and CFO
−36.1%
93,015
as of Feb 10, 2026

Trades

2,289 trades since 2004
TypeInsiderRoleSharesPriceHeld after
Sep 28, 2026Plan sale
Michael HsingCEO, Director
CEO, Director
CEO, Director
30,000
at $1,344.97
$1,344.97$40.3M
−3.0%
964K after
964,129
Aug 24, 2026Sale
Robert W. Dean IIInterim CFO
Interim CFO
Interim CFO
32
at $1,297.72
$1,297.72$41.5K
−0.4%
7.16K after
7,159
Aug 24, 2026Sale
Kuo Wei Herbert ChangDirector
Director
Director
50
at $1,281.57
$1,281.57$64.1K
−8.8%
515 after
515
Aug 17, 2026Sale
Robert W. Dean IIInterim CFO
Interim CFO
Interim CFO
6
at $1,413.64
$1,413.64$8.48K
−<0.1%
7.19K after
7,191
Aug 11, 2026Sale
Kuo Wei Herbert ChangDirector
Director
Director
50
at $1,420.00
$1,420.00$71.0K
−8.1%
565 after
565
Aug 5, 2026Sale
Robert W. Dean IIInterim CFO
Interim CFO
Interim CFO
105
at $1,344.27
$1,344.27$141K
−1.4%
7.20K after
7,197
Aug 3, 2026Plan sale
Maurice SciammasEVP, WW Sales & Marketing
EVP, WW Sales & Marketing
EVP, WW Sales & Marketing
30
at $1,343.94
$1,343.94$40.3K
−<0.1%
305K after
305,492
Jul 15, 2026Plan sale
Maurice SciammasEVP, WW Sales & Marketing
EVP, WW Sales & Marketing
EVP, WW Sales & Marketing
15,000
at $1,349.73
$1,349.73$20.2M
−4.7%
306K after
305,522
Jul 1, 2026Plan sale
Maurice SciammasEVP, WW Sales & Marketing
EVP, WW Sales & Marketing
EVP, WW Sales & Marketing
30
at $1,351.61
$1,351.61$40.5K
−<0.1%
321K after
320,522
Jun 1, 2026Plan sale
Maurice SciammasEVP, WW Sales & Marketing
EVP, WW Sales & Marketing
EVP, WW Sales & Marketing
30
at $1,533.95
$1,533.95$46.0K
−<0.1%
321K after
320,552
  • Michael Hsing$40.3M
    Sep 28, 2026 · Plan sale30,000 at $1,344.97
    CEO, Director−3.0% of holdings, 964K after
  • Robert W. Dean II$41.5K
    Aug 24, 2026 · Sale32 at $1,297.72
    Interim CFO−0.4% of holdings, 7.16K after
  • Kuo Wei Herbert Chang$64.1K
    Aug 24, 2026 · Sale50 at $1,281.57
    Director−8.8% of holdings, 515 after
  • Robert W. Dean II$8.48K
    Aug 17, 2026 · Sale6 at $1,413.64
    Interim CFO−<0.1% of holdings, 7.19K after
  • Kuo Wei Herbert Chang$71.0K
    Aug 11, 2026 · Sale50 at $1,420.00
    Director−8.1% of holdings, 565 after
  • Robert W. Dean II$141K
    Aug 5, 2026 · Sale105 at $1,344.27
    Interim CFO−1.4% of holdings, 7.20K after
  • Maurice Sciammas$40.3K
    Aug 3, 2026 · Plan sale30 at $1,343.94
    EVP, WW Sales & Marketing−<0.1% of holdings, 305K after
  • Maurice Sciammas$20.2M
    Jul 15, 2026 · Plan sale15,000 at $1,349.73
    EVP, WW Sales & Marketing−4.7% of holdings, 306K after
  • Maurice Sciammas$40.5K
    Jul 1, 2026 · Plan sale30 at $1,351.61
    EVP, WW Sales & Marketing−<0.1% of holdings, 321K after
  • Maurice Sciammas$46.0K
    Jun 1, 2026 · Plan sale30 at $1,533.95
    EVP, WW Sales & Marketing−<0.1% of holdings, 321K after