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MPWR · Monolithic Power Systems, Inc.

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TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475

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MPWR

Name: MONOLITHIC POWER SYSTEMS, INC. (MPWR) insider trading and ownership data
Creator: WaveMan
License: https://wave-man.com/terms

MONOLITHIC POWER SYSTEMS, INC.

SEMICONDUCTORS & ELECTRONICS · SEMICONDUCTORS & RELATED DEVICES · CIK 0001280452

CONGRESS · 1FORM 144 · 5☆ WATCH

INSIDER NET · 180D

-$240.9M

open-market buys minus sells, Form 4 codes P and S

INSIDER BUYERS · 180D

CONGRESS BUYERS · 1Y

FUNDS ADDED · QTR

13F, latest reported quarter

REVENUE GROWTH

+26.4%

XBRL, annual

NET MARGIN

22.3%

SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST

INSIDERS

net -$240.9M over 180 days

-$20.7M over 90 days

below 94% of Semiconductors & Electronics

CONGRESS

1 member bought in the last year

the lowest in Semiconductors & Electronics

FUNDS

fewer than five institutions report holding it

REVENUE

+26.4% year over year

more than 72% of Semiconductors & Electronics

MARGIN

22.3% net margin

more than 91% of Semiconductors & Electronics

BUYBACKS

$4.0M repurchased, FY to 2026-06-30

below 79% of Semiconductors & Electronics

SHORT

4.3% of shares outstanding short · 2.1 days to cover · settled 2026-07-31

more than 53% of Semiconductors & Electronics

THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET

Insiders are net sellers: -$240.9M across 9 people in 180 days.

1 member of Congress reported buying it this year.

The year, with the filings on it

Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail

TOTAL 12M RETURN +49.1%

+49.1%12M

INSIDER SELLFORM 144

INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY

Live price

Daily candles from TradingView, on their licence — no filings are marked on this one

WHY THIS NAME IS ON THE DESK

Insiders have filed to sell — before selling.

The record shows a net $240.9M sold by insiders over 180 days, 1 Congress member(s) bought in 12 months, $20.6M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.

Backtest this pattern Open the screener

Same sector, ranked by filing activity

Sector from the SEC's own SIC classification

NVDA CRDO VICR VPLM ALAB PI MTSI MU AIP AVGO MSI AMD

Insider transactions

Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, MONOLITHIC POWER SYSTEMS, INC. insiders sold a net $240.9M of stock across 1,090 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-05.

INSIDER

FILED

VALUE

CHANG KUO WEI HERBERT

Director

SELL

2026-08-24

50.0

$64.1K

DEAN ROBERT W II

Interim CFO

SELL

2026-08-24

32.0

$41.5K

DEAN ROBERT W II

Interim CFO

SELL

2026-08-17

6.0

$8.5K

CHANG KUO WEI HERBERT

Director

SELL

2026-08-11

50.0

$71.0K

DEAN ROBERT W II

Interim CFO

SELL

2026-08-05

105.0

$141.1K

1,090 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 1,085 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders

13F · holdings as of the latest quarter funds have reported

no 13F holders found for this ticker

SCHEDULE 13D/G

No 5%+ ownership filings

Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.

Planned sales · Form 144

Filed before the sale — intent, not a trade

DEAN ROBERT W II

FILED 2026-08-24

$41.5K

DEAN ROBERT W II

FILED 2026-08-17

$8.1K

Kuo Wei Chang

FILED 2026-08-11

$142.0K

ROBERT DEAN

FILED 2026-08-05

$141.1K

MAURICE SCIAMMAS

FILED 2026-07-15

$20.2M

Executive pay vs shareholder return · Mr. Hsing

DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself

CEO TOTAL

ACTUALLY PAID

OTHER NEOs AVG

TSR

PEER TSR

2025

$19.9M

$250.2M

$8.5M

+157%

+153%

2024

$19.0M

$21.9M

$8.1M

+66%

+78%

2023

$14.6M

$138.3M

$5.9M

+76%

+49%

2022

$20.7M

-$66.6M

$8.6M

-2%

-9%

2021

$20.3M

$114.1M

$7.2M

+35%

+41%

TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP

Fundamentals

Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all

	2025-12	2025-09	2025-06	2025-03
REVENUE	$2.8B	—	—	—
GROSS PROFIT	$1.5B	—	—	—
OPERATING INCOME	$728.6M	—	—	—
NET INCOME	$621.5M	—	—	—
EPS (DILUTED)	12.86	—	—	—
OPERATING CASH FLOW	$838.2M	—	—	—
CASH	$1.1B	$1.1B	$787.4M	$637.4M
BUYBACKS	$6.6M	—	—	—
DIVIDENDS PAID	$284.8M	—	—	—

SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-05 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE