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 TradingView

Insider transactions 122

Limited filing history

Filters

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

Showing the first 6 of 20 trades on this page.

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $788.69K
Reported price: $1,323.31 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $2.82M
Reported price: $1,328.54 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $1.48M
Reported price: $1,333.34 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $3.95M
Reported price: $1,338.66 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $7.77M
Reported price: $1,343.76 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $8.54M
Reported price: $1,347.15 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $14.82M
Reported price: $1,351.43 / share

Sale disclosed

Michael Hsing

CEO

Common Stock

Reported value: $176.4K
Reported price: $1,356.94 / share

Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value: $41.53K
Reported price: $1,297.72 / share

Sale disclosed

Kuo Wei Herbert Chang

Director

Common Stock

Reported value: $64.08K
Reported price: $1,281.57 / share

Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value: $8.48K
Reported price: $1,413.64 / share

Sale disclosed

Kuo Wei Herbert Chang

Director

Common Stock

Reported value: $71K
Reported price: $1,420.00 / share

Sale disclosed

Robert W. Dean II

Interim CFO

Common Stock

Reported value: $141.15K
Reported price: $1,344.27 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $40.32K
Reported price: $1,343.94 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $692.49K
Reported price: $1,314.03 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $361.25K
Reported price: $1,318.42 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $541.49K
Reported price: $1,323.93 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $616.8K
Reported price: $1,329.30 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $1.04M
Reported price: $1,334.59 / share

Sale disclosed

Maurice Sciammas

EVP, WW Sales & Marketing

Common Stock

Reported value: $1.96M
Reported price: $1,339.59 / share

Reporting insider	Security / transaction	Amount / price	Value	Traded / disclosed	Source
CEO	Common StockSale10b5-18 trades	30,000avg $1,344.97 / share	$40.35M	Sep 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
Interim CFO	Common StockSale	32$1,297.72 / share	$41.53K	Aug 24Filed Aug 26 · 2d later	SEC filing
Director	Common StockSale	50$1,281.57 / share	$64.08K	Aug 24Filed Aug 25 · 1d later	SEC filing
Interim CFO	Common StockSale	6$1,413.64 / share	$8.48K	Aug 17Filed Aug 19 · 2d later	SEC filing
Director	Common StockSale	50$1,420.00 / share	$71K	Aug 11Filed Aug 13 · 2d later	SEC filing
Interim CFO	Common StockSale	105$1,344.27 / share	$141.15K	Aug 5Filed Aug 6 · 1d later	SEC filing
EVP, WW Sales & Marketing	Common StockSale10b5-1	30$1,343.94 / share	$40.32K	Aug 3Filed Aug 5 · 2d later	SEC filing
EVP, WW Sales & Marketing	Common StockSale10b5-16 trades	3,910avg $1,330.81 / share	$5.2M	Jul 15Filed Jul 17 · 2d later	6 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

Showing the latest 20 of 111 trades. Show all 111 trades

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 TubervilleReporting Senate member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: May 3, 2024

Partial sale disclosed

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

The filing reports a partial sale for a spouse.

Byron DonaldsReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: June 5, 2026

Partial sale disclosed

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

The filing reports a partial sale for the member.

Byron DonaldsReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: June 5, 2026

Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for a joint account.

Markwayne MullinReporting Senate member

Reported amount: $15,001 – $50,000Reported range; exact amount not disclosed.
Trade date: February 4, 2026

Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for a spouse.

Markwayne MullinReporting Senate member

Reported amount: $15,001 – $50,000Reported range; exact amount not disclosed.
Trade date: January 5, 2026

Purchase disclosed

Monolithic Power Systems, Inc. - Common Stock · Stock

The filing reports a purchase for the member.

Markwayne MullinReporting Senate member

Reported amount: $15,001 – $50,000Reported range; exact amount not disclosed.
Trade date: January 5, 2026

Purchase disclosed

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

The filing reports a purchase for a dependent.

Michael Patrick GuestReporting House member

Reported amount: $1,001 – $15,000Reported range; exact amount not disclosed.
Trade date: October 20, 2025

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

Limited filing history · Market-wide discovery does not establish complete company history. View 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.

Reporting insider

Security / transaction

Amount / price

Value

Traded / disclosed

Source

CEO

Common StockSale10b5-18 trades

30,000avg $1,344.97 / share

$40.35M

Sep 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

Interim CFO

Common StockSale

32$1,297.72 / share

$41.53K

Aug 24Filed Aug 26 · 2d later

SEC filing

Director

Common StockSale

50$1,281.57 / share

$64.08K

Aug 24Filed Aug 25 · 1d later

SEC filing

Interim CFO

Common StockSale

6$1,413.64 / share

$8.48K

Aug 17Filed Aug 19 · 2d later

SEC filing

Director

Common StockSale

50$1,420.00 / share

$71K

Aug 11Filed Aug 13 · 2d later

SEC filing

Interim CFO

Common StockSale

105$1,344.27 / share

$141.15K

Aug 5Filed Aug 6 · 1d later

SEC filing

EVP, WW Sales & Marketing

Common StockSale10b5-1

30$1,343.94 / share

$40.32K

Aug 3Filed Aug 5 · 2d later

SEC filing

EVP, WW Sales & Marketing

Common StockSale10b5-16 trades

3,910avg $1,330.81 / share

$5.2M

Jul 15Filed Jul 17 · 2d later

6 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

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

Limited filing history · Market-wide discovery does not establish complete company history. View 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.