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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) 104 107 Form 4 filings on record, the earliest from Oct 2, 2024, newest first. Filing history page 1 of 3.
Date Insider Transaction Security Shares Price Value Aug 31, 2026 ST Saria Tseng - Officer Gift Common Stock 2,000
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 71.30
Dividend yield 0.69%
Average volume 889.8K
52 week high $1,714.09
52 week low $833.18
Today's high $1,184.15
Today's low $1,146.40
Open $1,183.15
Volume 950.2K
Previous close $1,147.61
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.
Aug 31, 2026 ST Saria Tseng - Officer Gift Common Stock 2,000 $0.00 -
Aug 5, 2026 RI Robert W. Dean II - Officer Open-market sale Common Stock 105 $1,344.27 $141K
Aug 3, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30 $1,343.94 $40K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 527 $1,314.03 $692K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 274 $1,318.42 $361K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 409 $1,323.93 $541K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 464 $1,329.30 $617K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 776 $1,334.59 $1.04M
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 1,460 $1,339.59 $1.96M
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 1,864 $1,344.16 $2.51M
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 1,506 $1,348.91 $2.03M
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 5,640 $1,352.95 $7.63M
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 50 $1,359.36 $68K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 240 $1,369.18 $329K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 472 $1,375.47 $649K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 418 $1,378.73 $576K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 410 $1,384.11 $567K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 50 $1,388.19 $69K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 213 $1,396.16 $297K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 117 $1,400.45 $164K
Jul 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 110 $1,405.71 $155K
Jul 1, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30 $1,351.61 $41K
Jun 1, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30 $1,533.95 $46K
May 27, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 7,565 $1,700.00 $12.86M
May 26, 2026 JZ Jeff Zhou Open-market sale Common Stock 486 $1,680.00 $816K
May 22, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 5,000 $1,586.43 $7.93M
May 22, 2026 ST Saria Tseng - Officer Gift Common Stock 200 $0.00 -
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 2,929 $1,503.05 $4.40M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 3,769 $1,507.70 $5.68M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 551 $1,513.11 $834K
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 352 $1,518.15 $534K
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 130 $1,521.43 $198K
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 3,424 $1,462.61 $5.01M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 5,819 $1,467.62 $8.54M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 5,049 $1,472.84 $7.44M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 4,082 $1,476.96 $6.03M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 5,737 $1,482.51 $8.51M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 608 $1,499.46 $912K
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 6,688 $1,486.76 $9.94M
May 18, 2026 MH Michael Hsing - Officer Open-market sale Common Stock 862 $1,491.48 $1.29M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 3,741 $1,550.36 $5.80M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 1,717 $1,557.48 $2.67M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 2,010 $1,562.01 $3.14M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 2,020 $1,567.15 $3.17M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 1,312 $1,571.49 $2.06M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 703 $1,577.75 $1.11M
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 447 $1,582.21 $707K
May 15, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 50 $1,585.51 $79K
May 6, 2026 DX Deming Xiao - Officer Open-market sale Common Stock 3,329 $1,648.38 $5.49M
May 6, 2026 DX Deming Xiao - Officer Open-market sale Common Stock 14,167 $1,652.80 $23.42M
May 6, 2026 DX Deming Xiao - Officer Open-market sale Common Stock 11,597 $1,657.93 $19.23M
May 6, 2026 DX Deming Xiao - Officer Open-market sale Common Stock 907 $1,661.38 $1.51M
May 6, 2026 EW Eileen Wynne Open-market sale Common Stock 335 $1,582.68 $530K
May 5, 2026 JZ Jeff Zhou Open-market sale Common Stock 514 $1,574.48 $809K
May 5, 2026 JZ Jeff Zhou Open-market sale Common Stock 500 $1,600.00 $800K
May 6, 2026 JZ Jeff Zhou Open-market sale Common Stock 500 $1,650.00 $825K
May 4, 2026 MS Maurice Sciammas - Officer Open-market sale Common Stock 30 $1,588.73 $48K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 560 $1,266.48 $709K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 360 $1,270.29 $457K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 240 $1,279.55 $307K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 120 $1,287.12 $154K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 400 $1,292.08 $517K
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 800 $1,302.52 $1.04M
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 1,279 $1,308.30 $1.67M
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 4,244 $1,312.82 $5.57M
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 840 $1,319.25 $1.11M
Apr 8, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 120 $1,321.94 $159K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 1,396 $1,179.50 $1.65M
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 244 $1,139.96 $278K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 556 $1,144.42 $636K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 480 $1,149.05 $552K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 560 $1,159.62 $649K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 684 $1,165.66 $797K
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 2,036 $1,170.38 $2.38M
Apr 6, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 1,680 $1,176.35 $1.98M
Apr 1, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 576 $1,131.24 $652K
Apr 1, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 184 $1,132.15 $208K
Apr 1, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 160 $1,134.14 $181K
Apr 1, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 188 $1,135.91 $214K
Apr 1, 2026 ST Saria Tseng - Officer Open-market sale Common Stock 292 $1,136.99 $332K
$AIP
Arteris, Inc.
Robert W. Dean II - OfficerOpen-market sale$42K
