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MONOLITHIC POWER SYSTEMS, INC. (MPWR) S&P 500 XNAS SEMICONDUCTORS & RELATED DEVICES Net insider selling (90d)
Latest MPWR Insider Trades
About MONOLITHIC POWER SYSTEMS, INC. (MPWR) Monolithic Power Systems is a power chipmaker specializing in voltage regulators. Its mission is to reduce total energy consumption in end systems to improve performance and save customers cost. It serves the data center, automotive, industrial, communications, and consumer end markets. MPS uses a fabless manufacturing model, partnering with third-party chip foundries to host its proprietary BCD process technology.
Headquarters WEST PALM BEACH, FL
Employees 4,501
Listed 2004
Exchange XNAS https://www.monolithicpower.com SEC filings for MPWR on EDGAR
90-Day SEC Filing Activity Form 4 transaction type Transactions Shares Total value Open-market sale 25 15,303 $20.65M Grant or award 1 1,359 Bona-fide gift 4 54,000
MPWR Insider Transactions (Form 4) 108 107 Form 4 filings on record, the earliest from Oct 2, 2024, newest first. Filing history page 2 of 3.
Date Insider Transaction Security Shares Price Value Apr 1, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30
Recent MPWR Form 8-K Filings 4
Recent MPWR Form 144 Notices of Proposed Sale 3 A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
Filed Filer Relationship Shares Market value Notice Aug 24, 2026 DEAN ROBERT W II Officer 32 $42K View on EDGAR Aug 17, 2026 DEAN ROBERT W II Officer
MPWR Insider Trading - FAQ
What is the latest insider trade for MPWR? MONOLITHIC POWER SYSTEMS, INC. (MPWR) had 11 insider filings in the last 90 days, with the most recent on 2026-09-02. The full record for MPWR runs to 107 Form 4 filings, the earliest from 2024-10-02. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
How many insiders are buying MPWR stock? No insider purchases of MPWR were filed in the last 90 days.
How many insiders are selling MPWR stock? 25 insider sales of MPWR were filed in the last 90 days, totaling $20.65M.
Where can I see MPWR SEC filings (Form 4, 10-K, 10-Q, 8-K)? This page tracks MPWR Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
How can I follow MPWR insider buys? Create a free InsiderAlpha account and press Watch on this page to add MPWR to your watchlist. A free account also opens the full scored daily plan with every past day and 3 months of price history. No card is required. Sign up at https://insideralpha.ai/register.
More Information Technology Companies with Insider Activity Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
Related Companies - Recent Insider Activity What is SEC Form 4? The filing insiders must submit within two business days of a trade, and how to read its transaction codes. Track MPWR insider activity as it files Real-time Form 4 alerts, AI-scored daily trade ideas and 10b5-1 plan flags.
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Market cap $56.40B
P/E ratio 72.10
Dividend yield 0.68%
Average volume 889.8K
52 week high $1,714.09
52 week low $833.18
Today's high -
Today's low -
Open -
Volume -
Previous close $1,169.58
Shares outstanding 49.14M Market cap
$56.40B
4,501 employees
MPWR Insider Sentiment - Last 90 Days Share of open-market insider dollar volume that was buying versus selling, from SEC Form 4 filings.
0% Buying 100% Selling
0 insider purchases totaling $0 against 25 sales totaling $20.65M.
Most-Active MPWR Insiders - Last 90 Days 10 Other acquisition / disposition 1 5
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 5,154 $1,000.81 $5.16M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 9,080 $1,005.18 $9.13M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 3,360 $1,009.63 $3.39M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 3,194 $1,017.22 $3.25M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 2,200 $1,023.00 $2.25M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 2,440 $1,029.21 $2.51M
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 166 $1,035.60 $172K
Mar 30, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 80 $1,041.12 $83K
Mar 20, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30 $1,095.07 $33K
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 12,731 $1,155.71 $14.71M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 4,992 $1,159.84 $5.79M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 4,001 $1,164.92 $4.66M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 2,076 $1,168.80 $2.43M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 200 $1,173.39 $235K
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 480 $1,180.79 $567K
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 160 $1,188.23 $190K
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 600 $1,194.34 $717K
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,440 $1,200.81 $1.73M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 3,640 $1,205.82 $4.39M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,240 $1,210.11 $1.50M
Feb 12, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,440 $1,217.12 $1.75M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 363 $1,158.71 $421K
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,366 $1,163.71 $1.59M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,533 $1,167.62 $1.79M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,987 $1,172.92 $2.33M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 2,799 $1,177.67 $3.30M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,542 $1,182.82 $1.82M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 2,104 $1,188.17 $2.50M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 6,079 $1,192.67 $7.25M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 14,578 $1,197.20 $17.45M
Feb 11, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 649 $1,202.28 $780K
Feb 11, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 200 $1,179.98 $236K
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 4,302 $1,132.01 $4.87M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 6,325 $1,136.75 $7.19M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 16,080 $1,141.88 $18.36M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 3,864 $1,145.90 $4.43M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 1,215 $1,151.11 $1.40M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 694 $1,154.96 $802K
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 360 $1,161.41 $418K
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 880 $1,176.04 $1.03M
Feb 10, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 280 $1,197.26 $335K
Feb 9, 2026 VL Victor K. Lee Open-market sale Common Stock 400 $1,212.16 $485K
Feb 6, 2026 DX Deming Xiao - Officer Open-market sale Common Stock 22,875 $1,171.16 $26.79M
Feb 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 22,875 $1,171.16 $26.79M
Feb 6, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 22,875 $1,171.16 $26.79M
Feb 6, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 21,725 $1,171.16 $25.44M
Feb 6, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 54,923 $1,171.16 $64.32M
Feb 3, 2026 EW Eileen Wynne Grant or award Common Stock 189 $0.00 -
Feb 3, 2026 JZ Jeff Zhou Grant or award Common Stock 189 $0.00 -
Feb 3, 2026 DX Deming Xiao - Officer Grant or award Common Stock 57,170 $0.00 -
Feb 3, 2026 TB Theodore Blegen - Officer Grant or award Common Stock 38,745 $0.00 -
Feb 3, 2026 ST Saria Tseng - Officer Grant or award Common Stock 57,170 $0.00 -
Feb 3, 2026 MH Michael Hsing - Officer Grant or award Common Stock 136,825 $0.00 -
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 220 $1,110.58 $244K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 40 $1,117.11 $45K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $1,120.77 $90K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 40 $1,122.56 $45K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 200 $1,126.58 $225K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $1,127.39 $90K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 240 $1,128.43 $271K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 240 $1,129.28 $271K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 320 $1,130.48 $362K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 198 $1,131.70 $224K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 322 $1,132.67 $365K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 379 $1,133.47 $430K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 241 $1,134.41 $273K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 120 $1,135.49 $136K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 120 $1,136.35 $136K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $1,137.81 $91K
Feb 2, 2026 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $1,139.49 $91K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 40 $899.73 $36K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 40 $900.88 $36K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $901.88 $72K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 40 $902.31 $36K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 120 $904.38 $109K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $906.84 $73K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 80 $907.59 $73K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 480 $908.69 $436K
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 1,984 $909.00 $1.80M
Dec 1, 2025 TB Theodore Blegen - Officer Open-market sale Common Stock 56 $911.59 $51K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 385 $894.54 $344K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 1,625 $895.63 $1.46M
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 2,066 $896.37 $1.85M
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 754 $897.54 $677K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 145 $898.38 $130K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 320 $899.37 $288K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 346 $900.41 $312K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 880 $901.58 $793K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 120 $902.07 $108K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 160 $903.54 $145K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 200 $904.39 $181K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 160 $905.32 $145K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 272 $906.33 $247K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 10,200 $907.21 $9.25M
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 888 $908.49 $807K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 556 $909.35 $506K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 359 $910.42 $327K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 324 $911.92 $295K
Nov 25, 2025 ST Saria Tseng - Officer Open-market sale Common Stock 240 $912.30 $219K
Nov 24, 2025 MS Maurice Sciammas - Officer Open-market sale Common Stock 3,976 $895.23 $3.56M
$AIP
Arteris, Inc.
Robert W. Dean II - OfficerOpen-market sale$42K
