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M

MPWR

Nasdaq

MONOLITHIC POWER SYSTEMS, INC.

Latest disclosureSeptember 30, 2026
Insider score Why 0?
0/ 100
Qualifying buys · 30d
$0

0 purchases · 111 sales

Price by TradingViewDelayed quote from TradingView, for viewing only. It does not power Whale Atlas scores or alerts. If the quote does not load, open the TradingView link.

Insider transactions 122

Limited filing history
All122Buying0Selling111Other11
Filters

Last 30 daysNo qualifying insider buying. Sales: $40.35M by 1 insider.

122 trades · March 30, 2026 – September 28, 2026Incomplete history: this shows the filings imported so far, not every filing ever made. Dates are trade dates. Filters affect this table only.

Showing the first 6 of 122 trades on this page.

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$788.69K
Reported price
$1,323.31 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$2.82M
Reported price
$1,328.54 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$1.48M
Reported price
$1,333.34 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$3.95M
Reported price
$1,338.66 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$7.77M
Reported price
$1,343.76 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$8.54M
Reported price
$1,347.15 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$14.82M
Reported price
$1,351.43 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$176.4K
Reported price
$1,356.94 / share
Traded September 28, 2026Filed September 30, 2026SEC filing
Gift disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded August 31, 2026Filed September 2, 2026SEC filing
Gift disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded August 31, 2026Filed September 2, 2026SEC filing
Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value
$41.53K
Reported price
$1,297.72 / share
Traded August 24, 2026Filed August 26, 2026SEC filing
Other activity disclosed

Robert W. Dean II

Interim CFO

Common Stock

Value context
Not established
Reported price
$0 reported · see filing
Understand this price

The filing reports a zero transaction price. That is not a current market valuation; inspect the original filing for context.

Traded August 24, 2026Filed August 26, 2026SEC filing
Sale disclosed

Kuo Wei Herbert Chang

Director

Common Stock

Reported value
$64.08K
Reported price
$1,281.57 / share
Traded August 24, 2026Filed August 25, 2026SEC filing
Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value
$8.48K
Reported price
$1,413.64 / share
Traded August 17, 2026Filed August 19, 2026SEC filing
Sale disclosed

Kuo Wei Herbert Chang

Director

Common Stock

Reported value
$71K
Reported price
$1,420.00 / share
Traded August 11, 2026Filed August 13, 2026SEC filing
Gift disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded August 4, 2026Filed August 6, 2026SEC filing
Gift disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded August 4, 2026Filed August 6, 2026SEC filing
Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value
$141.15K
Reported price
$1,344.27 / share
Traded August 5, 2026Filed August 6, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$40.32K
Reported price
$1,343.94 / share
Traded August 3, 2026Filed August 5, 2026SEC filing
Award disclosed

Robert W. Dean II

Interim CFO

Common Stock

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded July 25, 2026Filed July 28, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$692.49K
Reported price
$1,314.03 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$361.25K
Reported price
$1,318.42 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$541.49K
Reported price
$1,323.93 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$616.8K
Reported price
$1,329.30 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$1.04M
Reported price
$1,334.59 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$1.96M
Reported price
$1,339.59 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$2.51M
Reported price
$1,344.16 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$2.03M
Reported price
$1,348.91 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$7.63M
Reported price
$1,352.95 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$67.97K
Reported price
$1,359.36 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$328.6K
Reported price
$1,369.18 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$649.22K
Reported price
$1,375.47 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$576.31K
Reported price
$1,378.73 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$567.49K
Reported price
$1,384.11 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$69.41K
Reported price
$1,388.19 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$297.38K
Reported price
$1,396.16 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$163.85K
Reported price
$1,400.45 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$154.63K
Reported price
$1,405.71 / share
Traded July 15, 2026Filed July 17, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$40.55K
Reported price
$1,351.61 / share
Traded July 1, 2026Filed July 6, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$46.02K
Reported price
$1,533.95 / share
Traded June 1, 2026Filed June 3, 2026SEC filing
Gift disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded May 29, 2026Filed June 2, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$12.86M
Reported price
$1,700.00 / share
Traded May 27, 2026Filed May 29, 2026SEC filing
Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value
$36.29K
Reported price
$1,649.56 / share
Traded May 26, 2026Filed May 28, 2026SEC filing
Sale disclosed

Jeff Zhou

Director

Common Stock

Reported value
$816.48K
Reported price
$1,680.00 / share
Traded May 26, 2026Filed May 27, 2026SEC filing
Gift disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded May 22, 2026Filed May 27, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$7.93M
Reported price
$1,586.43 / share
Traded May 22, 2026Filed May 27, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$5.01M
Reported price
$1,462.61 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$8.54M
Reported price
$1,467.62 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$7.44M
Reported price
$1,472.84 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$6.03M
Reported price
$1,476.96 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$8.51M
Reported price
$1,482.51 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$9.94M
Reported price
$1,486.76 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$1.29M
Reported price
$1,491.48 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$911.67K
Reported price
$1,499.46 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$4.4M
Reported price
$1,503.05 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$5.68M
Reported price
$1,507.70 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$833.72K
Reported price
$1,513.11 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$534.39K
Reported price
$1,518.15 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value
$197.79K
Reported price
$1,521.43 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value
$6.25K
Reported price
$1,563.28 / share
Traded May 18, 2026Filed May 20, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$5.8M
Reported price
$1,550.36 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$2.67M
Reported price
$1,557.48 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$3.14M
Reported price
$1,562.01 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$3.17M
Reported price
$1,567.15 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$2.06M
Reported price
$1,571.49 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$1.11M
Reported price
$1,577.75 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$707.25K
Reported price
$1,582.21 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$79.28K
Reported price
$1,585.51 / share
Traded May 15, 2026Filed May 19, 2026SEC filing
Gift disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded May 13, 2026Filed May 15, 2026SEC filing
Gift disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Value context
Not a purchase
Reported price
Gift · no purchase price
Understand this price

The filing reports a zero transaction price for this gift. It does not establish the market value of the gift.

Traded May 13, 2026Filed May 15, 2026SEC filing
Other activity disclosed

Robert W. Dean II

Interim CFO

Common Stock

Value context
Not established
Reported price
$0 reported · see filing
Understand this price

The filing reports a zero transaction price. That is not a current market valuation; inspect the original filing for context.

Traded May 13, 2026Filed May 15, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$499.16K
Reported price
$1,559.88 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$1.28M
Reported price
$1,566.36 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$1.69M
Reported price
$1,571.58 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$1.31M
Reported price
$1,575.57 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$2.97M
Reported price
$1,581.81 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$4.11M
Reported price
$1,586.81 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$2.16M
Reported price
$1,591.38 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$4.18M
Reported price
$1,596.42 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eugen J. Elmiger

Director

Common Stock

Reported value
$822.47K
Reported price
$1,600.14 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Deming Xiao

EVP, Global Operations

Common Stock

Reported value
$5.49M
Reported price
$1,648.38 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Deming Xiao

EVP, Global Operations

Common Stock

Reported value
$23.42M
Reported price
$1,652.80 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Deming Xiao

EVP, Global Operations

Common Stock

Reported value
$19.23M
Reported price
$1,657.93 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Deming Xiao

EVP, Global Operations

Common Stock

Reported value
$1.51M
Reported price
$1,661.38 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Eileen Wynne

Director

Common Stock

Reported value
$530.2K
Reported price
$1,582.68 / share
Traded May 6, 2026Filed May 8, 2026SEC filing
Sale disclosed

Jeff Zhou

Director

Common Stock

Reported value
$809.28K
Reported price
$1,574.48 / share
Traded May 5, 2026Filed May 6, 2026SEC filing
Sale disclosed

Jeff Zhou

Director

Common Stock

Reported value
$800K
Reported price
$1,600.00 / share
Traded May 5, 2026Filed May 6, 2026SEC filing
Sale disclosed

Jeff Zhou

Director

Common Stock

Reported value
$825K
Reported price
$1,650.00 / share
Traded May 6, 2026Filed May 6, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$601.85K
Reported price
$1,583.81 / share
Traded May 5, 2026Filed May 6, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$47.66K
Reported price
$1,588.73 / share
Traded May 4, 2026Filed May 6, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$709.23K
Reported price
$1,266.48 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$457.3K
Reported price
$1,270.29 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$307.09K
Reported price
$1,279.55 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$154.45K
Reported price
$1,287.12 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$516.83K
Reported price
$1,292.08 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$1.04M
Reported price
$1,302.52 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$1.67M
Reported price
$1,308.30 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$5.57M
Reported price
$1,312.82 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$1.11M
Reported price
$1,319.25 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$158.63K
Reported price
$1,321.94 / share
Traded April 8, 2026Filed April 10, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$278.15K
Reported price
$1,139.96 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$636.3K
Reported price
$1,144.42 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$551.54K
Reported price
$1,149.05 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$649.39K
Reported price
$1,159.62 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$797.31K
Reported price
$1,165.66 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$2.38M
Reported price
$1,170.38 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$1.98M
Reported price
$1,176.35 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$1.65M
Reported price
$1,179.50 / share
Traded April 6, 2026Filed April 8, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$651.59K
Reported price
$1,131.24 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$208.32K
Reported price
$1,132.15 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$181.46K
Reported price
$1,134.14 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$213.55K
Reported price
$1,135.91 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$332K
Reported price
$1,136.99 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value
$33.49K
Reported price
$1,116.44 / share
Traded April 1, 2026Filed April 3, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$5.16M
Reported price
$1,000.81 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$9.13M
Reported price
$1,005.18 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$3.39M
Reported price
$1,009.63 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$3.25M
Reported price
$1,017.22 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$2.25M
Reported price
$1,023.00 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$2.51M
Reported price
$1,029.21 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$171.91K
Reported price
$1,035.60 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Sale disclosed

Saria Tseng

EVP & General Counsel

Common Stock

Reported value
$83.29K
Reported price
$1,041.12 / share
Traded March 30, 2026Filed April 1, 2026SEC filing
Reporting insiderSecurity / transactionAmount / priceValueTraded / disclosedSource
CEOCommon StockSale10b5-18 trades30,000avg $1,344.97 / share$40.35MSep 28Filed Sep 30 · 2d later
8 filings
  • 596 @ $1,323.31 · $788.69KSEC filing
  • 2,121 @ $1,328.54 · $2.82MSEC filing
  • 1,111 @ $1,333.34 · $1.48MSEC filing
  • 2,949 @ $1,338.66 · $3.95MSEC filing
  • 5,783 @ $1,343.76 · $7.77MSEC filing
  • 6,343 @ $1,347.15 · $8.54MSEC filing
  • 10,967 @ $1,351.43 · $14.82MSEC filing
  • 130 @ $1,356.94 · $176.4KSEC filing
EVP & General CounselCommon StockGift2,000Gift · no purchase priceNot a purchaseAug 31Filed Sep 2 · 2d laterSEC filing
EVP & General CounselCommon StockGift2,000Gift · no purchase priceNot a purchaseAug 31Filed Sep 2 · 2d laterSEC filing
Interim CFOCommon StockSale32$1,297.72 / share$41.53KAug 24Filed Aug 26 · 2d laterSEC filing
Interim CFOCommon StockOther transaction5$0 reported · see filingNot establishedAug 24Filed Aug 26 · 2d laterSEC filing
DirectorCommon StockSale50$1,281.57 / share$64.08KAug 24Filed Aug 25 · 1d laterSEC filing
Interim CFOCommon StockSale6$1,413.64 / share$8.48KAug 17Filed Aug 19 · 2d laterSEC filing
DirectorCommon StockSale50$1,420.00 / share$71KAug 11Filed Aug 13 · 2d laterSEC filing
EVP, WW Sales & MarketingCommon StockGift25,000Gift · no purchase priceNot a purchaseAug 4Filed Aug 6 · 2d laterSEC filing
EVP, WW Sales & MarketingCommon StockGift25,000Gift · no purchase priceNot a purchaseAug 4Filed Aug 6 · 2d laterSEC filing
Interim CFOCommon StockSale105$1,344.27 / share$141.15KAug 5Filed Aug 6 · 1d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-130$1,343.94 / share$40.32KAug 3Filed Aug 5 · 2d laterSEC filing
Interim CFOCommon StockGrant or award1,359Award · no purchase priceNon-cash awardJul 25Filed Jul 28 · 3d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-118 trades15,000avg $1,349.73 / share$20.25MJul 15Filed Jul 17 · 2d later
18 filings
  • 527 @ $1,314.03 · $692.49KSEC filing
  • 274 @ $1,318.42 · $361.25KSEC filing
  • 409 @ $1,323.93 · $541.49KSEC filing
  • 464 @ $1,329.30 · $616.8KSEC filing
  • 776 @ $1,334.59 · $1.04MSEC filing
  • 1,460 @ $1,339.59 · $1.96MSEC filing
  • 1,864 @ $1,344.16 · $2.51MSEC filing
  • 1,506 @ $1,348.91 · $2.03MSEC filing
  • 5,640 @ $1,352.95 · $7.63MSEC filing
  • 50 @ $1,359.36 · $67.97KSEC filing
  • 240 @ $1,369.18 · $328.6KSEC filing
  • 472 @ $1,375.47 · $649.22KSEC filing
  • 418 @ $1,378.73 · $576.31KSEC filing
  • 410 @ $1,384.11 · $567.49KSEC filing
  • 50 @ $1,388.19 · $69.41KSEC filing
  • 213 @ $1,396.16 · $297.38KSEC filing
  • 117 @ $1,400.45 · $163.85KSEC filing
  • 110 @ $1,405.71 · $154.63KSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-130$1,351.61 / share$40.55KJul 1Filed Jul 6 · 5d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-130$1,533.95 / share$46.02KJun 1Filed Jun 3 · 2d laterSEC filing
EVP, WW Sales & MarketingCommon StockGift12,472Gift · no purchase priceNot a purchaseMay 29Filed Jun 2 · 4d laterSEC filing
EVP & General CounselCommon StockSale7,565$1,700.00 / share$12.86MMay 27Filed May 29 · 2d laterSEC filing
Interim CFOCommon StockSale22$1,649.56 / share$36.29KMay 26Filed May 28 · 2d laterSEC filing
DirectorCommon StockSale486$1,680.00 / share$816.48KMay 26Filed May 27 · 1d laterSEC filing
EVP & General CounselCommon StockGift200Gift · no purchase priceNot a purchaseMay 22Filed May 27 · 5d laterSEC filing
EVP & General CounselCommon StockSale5,000$1,586.43 / share$7.93MMay 22Filed May 27 · 5d laterSEC filing
CEOCommon StockSale13 trades40,000avg $1,482.75 / share$59.31MMay 18Filed May 20 · 2d later
13 filings
  • 3,424 @ $1,462.61 · $5.01MSEC filing
  • 5,819 @ $1,467.62 · $8.54MSEC filing
  • 5,049 @ $1,472.84 · $7.44MSEC filing
  • 4,082 @ $1,476.96 · $6.03MSEC filing
  • 5,737 @ $1,482.51 · $8.51MSEC filing
  • 6,688 @ $1,486.76 · $9.94MSEC filing
  • 862 @ $1,491.48 · $1.29MSEC filing
  • 608 @ $1,499.46 · $911.67KSEC filing
  • 2,929 @ $1,503.05 · $4.4MSEC filing
  • 3,769 @ $1,507.70 · $5.68MSEC filing
  • 551 @ $1,513.11 · $833.72KSEC filing
  • 352 @ $1,518.15 · $534.39KSEC filing
  • 130 @ $1,521.43 · $197.79KSEC filing
Interim CFOCommon StockSale4$1,563.28 / share$6.25KMay 18Filed May 20 · 2d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-18 trades12,000avg $1,561.40 / share$18.74MMay 15Filed May 19 · 4d later
8 filings
  • 3,741 @ $1,550.36 · $5.8MSEC filing
  • 1,717 @ $1,557.48 · $2.67MSEC filing
  • 2,010 @ $1,562.01 · $3.14MSEC filing
  • 2,020 @ $1,567.15 · $3.17MSEC filing
  • 1,312 @ $1,571.49 · $2.06MSEC filing
  • 703 @ $1,577.75 · $1.11MSEC filing
  • 447 @ $1,582.21 · $707.25KSEC filing
  • 50 @ $1,585.51 · $79.28KSEC filing
EVP, WW Sales & MarketingCommon StockGift1,563Gift · no purchase priceNot a purchaseMay 13Filed May 15 · 2d laterSEC filing
EVP, WW Sales & MarketingCommon StockGift1,563Gift · no purchase priceNot a purchaseMay 13Filed May 15 · 2d laterSEC filing
Interim CFOCommon StockOther transaction2,156$0 reported · see filingNot establishedMay 13Filed May 15 · 2d laterSEC filing
DirectorCommon StockSale9 trades12,000avg $1,584.96 / share$19.02MMay 6Filed May 8 · 2d later
9 filings
  • 320 @ $1,559.88 · $499.16KSEC filing
  • 814 @ $1,566.36 · $1.28MSEC filing
  • 1,078 @ $1,571.58 · $1.69MSEC filing
  • 834 @ $1,575.57 · $1.31MSEC filing
  • 1,879 @ $1,581.81 · $2.97MSEC filing
  • 2,587 @ $1,586.81 · $4.11MSEC filing
  • 1,355 @ $1,591.38 · $2.16MSEC filing
  • 2,619 @ $1,596.42 · $4.18MSEC filing
  • 514 @ $1,600.14 · $822.47KSEC filing
EVP, Global OperationsCommon StockSale4 trades30,000avg $1,654.55 / share$49.64MMay 6Filed May 8 · 2d later
4 filings
  • 3,329 @ $1,648.38 · $5.49MSEC filing
  • 14,167 @ $1,652.80 · $23.42MSEC filing
  • 11,597 @ $1,657.93 · $19.23MSEC filing
  • 907 @ $1,661.38 · $1.51MSEC filing
DirectorCommon StockSale335$1,582.68 / share$530.2KMay 6Filed May 8 · 2d laterSEC filing
DirectorCommon StockSale2 trades1,014avg $1,587.06 / share$1.61MMay 5Filed May 6 · 1d later
2 filings
  • 514 @ $1,574.48 · $809.28KSEC filing
  • 500 @ $1,600.00 · $800KSEC filing
DirectorCommon StockSale500$1,650.00 / share$825KMay 6Filed May 6 · 0d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale380$1,583.81 / share$601.85KMay 5Filed May 6 · 1d laterSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-130$1,588.73 / share$47.66KMay 4Filed May 6 · 2d laterSEC filing
EVP & General CounselCommon StockSale10b5-110 trades8,963avg $1,305.22 / share$11.7MApr 8Filed Apr 10 · 2d later
10 filings
  • 560 @ $1,266.48 · $709.23KSEC filing
  • 360 @ $1,270.29 · $457.3KSEC filing
  • 240 @ $1,279.55 · $307.09KSEC filing
  • 120 @ $1,287.12 · $154.45KSEC filing
  • 400 @ $1,292.08 · $516.83KSEC filing
  • 800 @ $1,302.52 · $1.04MSEC filing
  • 1,279 @ $1,308.30 · $1.67MSEC filing
  • 4,244 @ $1,312.82 · $5.57MSEC filing
  • 840 @ $1,319.25 · $1.11MSEC filing
  • 120 @ $1,321.94 · $158.63KSEC filing
EVP & General CounselCommon StockSale10b5-18 trades7,636avg $1,167.95 / share$8.92MApr 6Filed Apr 8 · 2d later
8 filings
  • 244 @ $1,139.96 · $278.15KSEC filing
  • 556 @ $1,144.42 · $636.3KSEC filing
  • 480 @ $1,149.05 · $551.54KSEC filing
  • 560 @ $1,159.62 · $649.39KSEC filing
  • 684 @ $1,165.66 · $797.31KSEC filing
  • 2,036 @ $1,170.38 · $2.38MSEC filing
  • 1,680 @ $1,176.35 · $1.98MSEC filing
  • 1,396 @ $1,179.50 · $1.65MSEC filing
EVP & General CounselCommon StockSale10b5-15 trades1,400avg $1,133.52 / share$1.59MApr 1Filed Apr 3 · 2d later
5 filings
  • 576 @ $1,131.24 · $651.59KSEC filing
  • 184 @ $1,132.15 · $208.32KSEC filing
  • 160 @ $1,134.14 · $181.46KSEC filing
  • 188 @ $1,135.91 · $213.55KSEC filing
  • 292 @ $1,136.99 · $332KSEC filing
EVP, WW Sales & MarketingCommon StockSale10b5-130$1,116.44 / share$33.49KApr 1Filed Apr 3 · 2d laterSEC filing
EVP & General CounselCommon StockSale10b5-18 trades25,674avg $1,010.50 / share$25.94MMar 30Filed Apr 1 · 2d later
8 filings
  • 5,154 @ $1,000.81 · $5.16MSEC filing
  • 9,080 @ $1,005.18 · $9.13MSEC filing
  • 3,360 @ $1,009.63 · $3.39MSEC filing
  • 3,194 @ $1,017.22 · $3.25MSEC filing
  • 2,200 @ $1,023.00 · $2.25MSEC filing
  • 2,440 @ $1,029.21 · $2.51MSEC filing
  • 166 @ $1,035.60 · $171.91KSEC filing
  • 80 @ $1,041.12 · $83.29KSEC filing
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Why this buying score?

No qualifying common-equity purchases

No eligible common-equity purchase is public by this cutoff within 180 transaction-date days. Other instruments, exercises and routine activity do not contribute purchase points.

+0 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Source
SEC EDGAR · Form 4
Issuer CIK
0001280452
Latest public acceptance
Sep 30, 2026, 09:21 PM UTC
Score calculated
Oct 7, 2026, 12:07 AM UTC
Parser
form4-parser-1.5
Classifier
form4-classifier-1.1
Scoring methodology
insider-experimental-1.1
Availability
Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.

Insider activity can have many explanations. Signal Strength is not a probability of profit or a recommendation to trade.

Congress transactions 7

All Congress filings
Full sale disclosedAmended report

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a full sale for a joint account.

Thomas H Tuberville official portraitThomas H TubervilleReporting Senate member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
May 3, 2024
Filed August 5, 2026 · 824d laterOriginal report
Partial sale disclosed

Monolithic Power Systems, Inc. - Common Stock (MPWR) · Stock

The filing reports a partial sale for a spouse.

Byron Donalds official portraitByron DonaldsReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
June 5, 2026
Filed July 15, 2026 · 40d laterOriginal report
Partial sale disclosed

Monolithic Power Systems, Inc. - Common Stock (MPWR) · Stock

The filing reports a partial sale for the member.

Byron Donalds official portraitByron DonaldsReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
June 5, 2026
Filed July 15, 2026 · 40d laterOriginal report
Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for a joint account.

Markwayne Mullin official portraitMarkwayne MullinReporting Senate member
Reported amount
$15,001 – $50,000Reported range; exact amount not disclosed.
Trade date
February 4, 2026
Filed March 2, 2026 · 26d laterOriginal report
Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for a spouse.

Markwayne Mullin official portraitMarkwayne MullinReporting Senate member
Reported amount
$15,001 – $50,000Reported range; exact amount not disclosed.
Trade date
January 5, 2026
Filed February 4, 2026 · 30d laterOriginal report
Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for the member.

Markwayne Mullin official portraitMarkwayne MullinReporting Senate member
Reported amount
$15,001 – $50,000Reported range; exact amount not disclosed.
Trade date
January 5, 2026
Filed February 4, 2026 · 30d laterOriginal report
Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock (MPWR) · Stock

The filing reports a purchase for a dependent.

Michael Patrick Guest official portraitMichael Patrick GuestReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
October 20, 2025
Filed November 19, 2025 · 30d laterOriginal report
Limited filing history · Market-wide discovery does not establish complete company history. View coverage