Stocks › MPWR
MONOLITHIC POWER SYSTEMS, INC.
MPWR·Nasdaq·
United States·USD
United States·USD$1473.69
-6.20 (-0.42%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
MPWR
MONOLITHIC POWER SYSTEMS, INC. · Nasdaq
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
MPWRS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of MPWR by members of U.S. Congress · 50 on record · 11 in the last 12 months
Whale Activity
Position changes in MPWR reported for 2026-09-30 by 1 tracked institutional filer
- Increased0
- New0
- Held0
- Decreased0
- Closed0
- No prior filing1
| Filer | Shares | Value | Change |
|---|---|---|---|
| CONGRESS ASSET MANAGEMENT CO | 74.4K | $100.2M | — |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by MPWR insiders, by quarter · Form 4
Recent Insider Transactions
7,064 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Hsing MichaelCEO · Director | Sale | −6,343 | $1347.15 | $8.5M | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −596 | $1323.31 | $789K | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −5,783 | $1343.76 | $7.8M | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −2,949 | $1338.66 | $3.9M | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −2,121 | $1328.54 | $2.8M | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −130 | $1356.94 | $176K | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −1,111 | $1333.34 | $1.5M | Sep 28, 2026 | Form 4 ↗ |
| Hsing MichaelCEO · Director | Sale | −11.0K | $1351.43 | $14.8M | Sep 28, 2026 | Form 4 ↗ |
| DEAN ROBERT W IIInterim CFO | Sale | −32 | $1297.72 | $42K | Aug 24, 2026 | Form 4 ↗ |
| CHANG KUO WEI HERBERTDirector · Director | Sale | −50 | $1281.57 | $64K | Aug 24, 2026 | Form 4 ↗ |
| DEAN ROBERT W IIInterim CFO | Sale | −6 | $1413.64 | $8K | Aug 17, 2026 | Form 4 ↗ |
| CHANG KUO WEI HERBERTDirector · Director | Sale | −50 | $1420.00 | $71K | Aug 11, 2026 | Form 4 ↗ |
| DEAN ROBERT W IIInterim CFO | Sale | −105 | $1344.27 | $141K | Aug 5, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −30 | $1343.94 | $40K | Aug 3, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −776 | $1334.59 | $1.0M | Jul 15, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −5,640 | $1352.95 | $7.6M | Jul 15, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −527 | $1314.03 | $692K | Jul 15, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −50 | $1388.19 | $69K | Jul 15, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −50 | $1359.36 | $68K | Jul 15, 2026 | Form 4 ↗ |
| Sciammas MauriceEVP, WW Sales & Marketing | Sale | −472 | $1375.47 | $649K | Jul 15, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding MPWR · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| Select Semiconductors Portfolio Fidelity Select Portfolios | 1.7M | $2.66B | 5.19% | May 31, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 1.5M | $2.05B | 0.09% | Jun 30, 2026 |
| VANGUARD 500 INDEX FUND VANGUARD INDEX FUNDS | 1.3M | $1.76B | 0.11% | Jun 30, 2026 |
| Invesco QQQ Trust, Series 1 | 1.0M | $1.44B | 0.29% | Jun 30, 2026 |
| iShares Semiconductor ETF iShares Trust | 1.0M | $1.40B | 2.93% | Jun 30, 2026 |
| VANGUARD MID-CAP INDEX FUND VANGUARD INDEX FUNDS | 1.0M | $1.40B | 0.62% | Jun 30, 2026 |
| Fidelity 500 Index Fund Fidelity Concord Street Trust | 623.3K | $976.3M | 0.12% | May 31, 2026 |
| VanEck Semiconductor ETF VanEck ETF Trust | 680.9K | $941.3M | 1.22% | Jun 30, 2026 |
| iShares Core S&P 500 ETF iShares Trust | 676.4K | $935.0M | 0.11% | Jun 30, 2026 |
| Fidelity Blue Chip Growth Fund Fidelity Securities Fund | 629.1K | $897.1M | 0.91% | Jul 31, 2026 |
Mutual funds and ETFs whose N-PORT filings list MPWR's shares (CUSIP 609839105), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming MONOLITHIC POWER SYSTEMS, INC. as client
No lobbying filings found naming MONOLITHIC POWER SYSTEMS, INC. as the client.
Government Contracts
Federal awards to MONOLITHIC POWER SYSTEMS, INC. · USAspending
No federal contract awards found for MONOLITHIC POWER SYSTEMS, INC..
U.S. Patents
Recent USPTO applications naming MONOLITHIC POWER SYSTEMS, INC.
No USPTO patent applications found for MONOLITHIC POWER SYSTEMS, INC..
Annual Financials
From MPWR's 10-K filings · XBRL
No annual XBRL figures on record for MPWR. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No stock splits in MPWR's price history.
About MONOLITHIC POWER SYSTEMS, INC.
From SEC EDGAR company records
Industry (SIC 3674)Semiconductors & Related Devices
SectorTechnology
HeadquartersWEST PALM BEACH, FL
IncorporatedDE
SEC CIK0001280452 ↗
Former namesMONOLITHIC POWER SYSTEMS INC