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MPWR

Monolithic Power Systems, Inc.

TechnologyS&P 500NASDAQ 100

Monolithic Power Systems, Inc. insider trading

Monolithic Power Systems, Inc. files with the SEC as a Semiconductors & Related Devices company headquartered in West Palm Beach, FL. Every time one of its executives or directors buys or sells the stock, the filing appears here the moment it reaches the SEC — with grants and option exercises set apart from the trades that cost the insider their own money.

From SEC filings

Recent MPWR insider transactions

3 insiders traded MPWR on the open market between Jul 15, 2026 and Aug 24, 2026 — 24 sales worth $20.6M, of which 19 were pre-scheduled under a 10b5-1 plan.

Bought
—
Sold
$20.6M

19 of 24 on a 10b5-1 plan

Net
−$20.6M
Insiders
3

Open-market purchases (code P) and sales (code S) from Monolithic Power Systems, Inc.'s own SEC Form 4 filings. Grants and option exercises are excluded — they are compensation, not decisions. Share counts are derived from the reported value and price. Verify any figure against the original filing before acting on it; this is monitoring, not advice.

Filing history last read from EDGAR on Sep 21, 2026. The live dashboard shows new filings the moment they clear.

Every MPWR Form 4 on SEC.gov

SEC Form 4 data, Q3 2024 to Q2 2026

MPWR insider trading by quarter

Between Jul 01, 2024 and Jun 30, 2026, 12 insiders traded MPWR on the open market: 0 purchases and 505 sales worth $910.4M, 324 of the sales pre-scheduled under a 10b5-1 plan. In the last four quarters alone: 0 purchases and 336 sales ($763.8M), by 12 insiders.

QuarterBoughtSold
Q2 2026—−$194.3M70 sales · 34 on a plan
Q1 2026—−$320.3M80 sales · 74 on a plan
Q4 2025—−$173.4M147 sales · 55 on a plan
Q3 2025—−$75.8M39 sales · 19 on a plan
Q2 2025—−$8.6M4 sales · 1 on a plan
Q1 2025—−$23.1M12 sales · 7 on a plan
Q4 2024—−$20.6M49 sales · 44 on a plan
Q3 2024—−$94.2M104 sales · 90 on a plan
Largest sale
−$64.3M of MPWR by Hsing Michael (CEO · Director) on Feb 06, 2026.

Open-market transactions through Jun 30, 2026most recent first

  • Sciammas Maurice10b5-1

    EVP, WW Sales & Marketing

    −$46K

    Jun 01, 2026

    30 sh · $1,533.95

  • Tseng Saria

    EVP & General Counsel

    −$12.9M

    May 27, 2026

    7,565 sh · $1,700.00

  • Zhou Jeff

    Director

    −$816.5K

    May 26, 2026

    486 sh · $1,680.00

  • Dean Robert W II

    Interim CFO

    −$36.3K

    May 26, 2026

    22 sh · $1,649.56

  • Tseng Saria

    EVP & General Counsel

    −$7.9M

    May 22, 2026

    5,000 sh · $1,586.43

  • Hsing Michael

    CEO · Director

    −$9.9M

    May 18, 2026

    6,688 sh · $1,486.76

  • Hsing Michael

    CEO · Director

    −$8.5M

    May 18, 2026

    5,819 sh · $1,467.62

  • Hsing Michael

    CEO · Director

    −$8.5M

    May 18, 2026

    5,737 sh · $1,482.51

  • Hsing Michael

    CEO · Director

    −$7.4M

    May 18, 2026

    5,049 sh · $1,472.84

  • Hsing Michael

    CEO · Director

    −$6M

    May 18, 2026

    4,082 sh · $1,476.96

  • Hsing Michael

    CEO · Director

    −$5.7M

    May 18, 2026

    3,769 sh · $1,507.70

  • Hsing Michael

    CEO · Director

    −$5M

    May 18, 2026

    3,424 sh · $1,462.61

  • Hsing Michael

    CEO · Director

    −$4.4M

    May 18, 2026

    2,929 sh · $1,503.05

  • Hsing Michael

    CEO · Director

    −$1.3M

    May 18, 2026

    862 sh · $1,491.48

  • Hsing Michael

    CEO · Director

    −$911.7K

    May 18, 2026

    608 sh · $1,499.46

From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.

Monolithic Power Systems, Inc. company record

SEC industry classification
Semiconductors & Related Devices
Headquarters
West Palm Beach, FL
Incorporated in
DE
Listed on
Nasdaq
SEC Central Index Key
0001280452

Sourced from this company's own SEC submissions record. The industry label is SEC's Standard Industrial Classification, which is more specific than the Technology sector shown above.

After insiders bought MPWR

What the stock actually did in the 90 days following each open-market purchase

Don't check MPWR — let it ping you

Get told the moment an insider moves on MPWR

Pro watches Monolithic Power Systems, Inc. for you and sends a Telegram ping within moments of a Form 4 clearing EDGAR — a C-suite open-market buy, a cluster, a 10b5-1 regime break — long before it reaches the press. Add MPWR to a watchlist, see each mover's benchmark-measured track record and which legendary funds hold it, and read the full filing history instead of the last 72 hours.

Track MPWR on the live dashboardFilings on SEC.gov

The live dashboard is free to open. Alerts, watchlists, full filing history and each mover's benchmark-measured track record are Pro. Monitoring, not advice.

How to read MPWR insider activity

Open-market purchase (code P)
An insider spending their own money at market price. This is the only buy code that reliably carries signal — it is a decision, not compensation.
Grants and option exercises (codes A, M)
Scheduled compensation. Most "insider buying" headlines are really this, which is why InsiderPulse weights it at a fraction of a real purchase.
Cluster buy
Two or more different insiders buying on the open market in the same window. One executive buying can mean anything; three is much harder to explain away.

Other Technology tickers

ENPHFSLRADSKANSSROPWDAYTEAMDDOGSNOWMDBZSOKTA
This week on the tape: who actually chose to sellThe weekly split of scheduled 10b5-1 selling vs deliberate sales, with the deciders named.

Questions

Are MPWR insiders buying or selling?
Between Jul 15, 2026 and Aug 24, 2026, 3 Monolithic Power Systems, Inc. insiders made no open-market purchases and 24 sales worth $20.6M, a net sale of $20.6M. 19 of the sales were pre-scheduled under a Rule 10b5-1 plan.
How much MPWR stock have insiders bought and sold in the last two years?
Between Jul 01, 2024 and Jun 30, 2026, 12 Monolithic Power Systems, Inc. insiders made no open-market purchases and 505 sales worth $910.4M. 324 of the sales were pre-scheduled under a Rule 10b5-1 plan. In the four quarters to Jun 30, 2026: no purchases and 336 sales ($763.8M). The largest sale was Hsing Michael selling $64.3M on Feb 06, 2026.
What was the largest recent MPWR insider trade?
Sciammas Maurice (EVP, WW Sales & Marketing) sold $7.6M of MPWR stock on Jul 15, 2026 at about $1352.95 a share, under a pre-scheduled 10b5-1 plan.
When did an insider last buy MPWR shares?
No open-market purchase by a Monolithic Power Systems, Inc. insider appears in the filings from Jul 15, 2026 to Aug 24, 2026 — every recorded open-market transaction in that period was a sale.
Where does MPWR insider trading data come from?
From the Form 4 filings Monolithic Power Systems, Inc.'s officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.

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