MPWR Monolithic Power Systems (MPWR) Insider Trading, Ownership & Congress Trades
Semiconductors & Electronics · Semiconductors & related devices · CIK 0001280452
Form 144 · 5
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
0
13F, latest reported quarter
What the filings say about MPWR
Insiders, 180 days
-$233.0M net sold
9 sellers · 10% of sales under a 10b5-1 plan
Congress, 1 year
0 bought · 1 sold
Latest: sale, 2026-06-05
Planned sales (Form 144), 90 days
$40.7M
5 notices
Monolithic Power Systems insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
Over the last 180 days, MONOLITHIC POWER SYSTEMS, INC. insiders sold a net $233.0M of stock across 1,098 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.
Insider
Filed
Shares
Value
Since filing
Context
- 260 earlier Form 4 trades (code P or S) here by this insider (260 sales), the last on May 18, 2026.
- The trade is 0.1% of the 847,668 shares held after it.
- No other insider sold within 30 days.
Insider activity: CEO Hsing Michael sold about $788.7K of MPWR under a 10b5-1 plan on Sep 28, 2026.Context
- 260 earlier Form 4 trades (code P or S) here by this insider (260 sales), the last on May 18, 2026.
- The trade is 0.3% of the 845,547 shares held after it.
- No other insider sold within 30 days.
Insider activity: CEO Hsing Michael sold about $2.8M of MPWR under a 10b5-1 plan on Sep 28, 2026.Context
- 260 earlier Form 4 trades (code P or S) here by this insider (260 sales), the last on May 18, 2026.
- The trade is 0.1% of the 844,436 shares held after it.
- No other insider sold within 30 days.
Insider activity: CEO Hsing Michael sold about $1.5M of MPWR under a 10b5-1 plan on Sep 28, 2026.Context
- 260 earlier Form 4 trades (code P or S) here by this insider (260 sales), the last on May 18, 2026.
- The trade is 0.4% of the 841,487 shares held after it.
- No other insider sold within 30 days.
Insider activity: CEO Hsing Michael sold about $3.9M of MPWR under a 10b5-1 plan on Sep 28, 2026.Context
- 260 earlier Form 4 trades (code P or S) here by this insider (260 sales), the last on May 18, 2026.
- The trade is 0.7% of the 835,704 shares held after it.
- No other insider sold within 30 days.
Insider activity: CEO Hsing Michael sold about $7.8M of MPWR under a 10b5-1 plan on Sep 28, 2026.1,098 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Seven facts, ranked against the sector ·
Rank is not a forecast
Insiders
net -$233.0M over 180 days
-$40.7M over 90 days
below 94% of Semiconductors & Electronics
Congress
no House purchase disclosed in the last 12 months
Funds
under five funds report holding it
Revenue
+26.4% year over year
more than 69% of Semiconductors & Electronics
Margin
22.3% net margin
more than 90% of Semiconductors & Electronics
Buybacks
$4.0M repurchased, FY to 2026-06-30
below 78% of Semiconductors & Electronics
Short interest
3.9% of the float short (float per yahoo 2026-10-26) · 2.3 days to cover · settled 2026-09-30
below 58% of Semiconductors & Electronics
What changed in the last 30 days
Sep 30CEO Hsing Michael sold $40.3M under a 10b5-1 plan (Sep 28)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Sep 28Officer MICHAEL HSING filed to sell $40.3M by Sep 28 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Watch MPWR
A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.
The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+14.4%12M
Insider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart.
When a name files heavily, the largest trades are drawn first.
Who owns MPWR: institutional holders (13F)
13F holdings, latest reported quarter
SEC 13F
No reported 13F holders
No fund above the reporting threshold listed this stock last quarter. That is a fact, not missing data.
Congress trades in MPWR
STOCK Act disclosures, US House only, filed up to 45 days after the trade
Sold 2026-06-05 · disclosed 40 days later
$1,001 - $15,000
Bought 2025-10-20 · disclosed 30 days later
$1,001 - $15,000
Bought 2025-04-08 · disclosed 30 days later
$1,001 - $15,000
Sold 2025-01-13 · disclosed 31 days later
$1,001 - $15,000
Activist and 5% holders (13D/13G)
No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.
MPWR planned insider sales (Form 144)
Notice of intent to sell, filed before any sale
MICHAEL HSING
Filed 2026-09-28
$40.3M
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
Executive pay vs shareholder return · Mr. Hsing
CEO pay, headline and as actually paid, against the company's
return and its chosen peers' (DEF 14A).
FY
CEO total
Actually paid
Other execs, 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). Returns are
cumulative from the start of the disclosure period. Green where the company beat its own peer group.
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $233.0M sold by insiders over 180 days, $40.7M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
MPWR financials
Revenue growth
+26.4%
XBRL, annual
Net margin
22.3%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$3.3B
four quarters, 2025-07-01 to 2026-06-30
Revenue, TTM MPWR
| FY Dec 2025 | $2.8B |
| FY Dec 2024 | $2.2B |
| FY Dec 2023 | $1.8B |
| FY Dec 2022 | $1.8B |
| FY Dec 2021 | $1.2B |
| Jun 2026 | $980.6M |
| Mar 2026 | $804.2M |
| Dec 2025 | $751.2M |
| Sep 2025 | $737.2M |
| Jun 2025 | $664.6M |
| Mar 2025 | $637.6M |
| Dec 2024 | $621.7M |
| Sep 2024 | $620.1M |
At each fiscal year end
Single quarter
Net margin, TTM
+24.5%
net income over revenue, 2025-07-01 to 2026-06-30
Net margin, TTM MPWR
| FY Dec 2025 | +22.3% |
| FY Dec 2024 | +72.1% |
| FY Dec 2023 | +23.5% |
| FY Dec 2022 | +24.4% |
| FY Dec 2021 | +20.0% |
| Jun 2026 | +26.2% |
| Mar 2026 | +24.0% |
| Dec 2025 | +22.9% |
| Sep 2025 | +24.4% |
| Jun 2025 | +20.3% |
| Mar 2025 | +21.2% |
| Dec 2024 | +201.8% |
| Sep 2024 | +23.3% |
At each fiscal year end
Single quarter
Free cash flow, TTM
$585.5M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Free cash flow, TTM MPWR
| FY Dec 2025 | $666.2M |
| FY Dec 2024 | $642.3M |
| FY Dec 2023 | $580.6M |
| FY Dec 2022 | $187.8M |
| FY Dec 2021 | $225.6M |
| Jun 2026 | $145.5M |
| Mar 2026 | $179.4M |
| Dec 2025 | $63.9M |
| Sep 2025 | $196.8M |
| Jun 2025 | $189.5M |
| Mar 2025 | $216.0M |
| Dec 2024 | $102.9M |
| Sep 2024 | $197.9M |
At each fiscal year end
Single quarter
Debt to equity
n/a
no debt line filed
Debt to equity MPWR
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Cash flow to debt
n/a
no debt line filed
Cash flow to debt MPWR
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on equity
+22.6%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on equity MPWR
| FY Dec 2025 | +19.2% |
| FY Dec 2024 | +63.7% |
| FY Dec 2023 | +23.0% |
| FY Dec 2022 | +30.1% |
| FY Dec 2021 | +21.9% |
| Jun 2026 | +22.6% |
| Mar 2026 | +20.1% |
| Dec 2025 | +19.2% |
| Sep 2025 | +59.5% |
| Jun 2025 | +61.8% |
| Mar 2025 | +63.0% |
| Dec 2024 | +63.7% |
| Sep 2024 | +20.2% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on assets
+18.7%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets MPWR
| FY Dec 2025 | +16.1% |
| FY Dec 2024 | +53.5% |
| FY Dec 2023 | +19.0% |
| FY Dec 2022 | +24.0% |
| FY Dec 2021 | +17.3% |
| Jun 2026 | +18.7% |
| Mar 2026 | +16.7% |
| Dec 2025 | +16.1% |
| Sep 2025 | +49.0% |
| Jun 2025 | +51.2% |
| Mar 2025 | +52.0% |
| Dec 2024 | +53.5% |
| Sep 2024 | +16.8% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on invested capital
n/a
no debt line filed
Return on invested capital MPWR
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on capital employed
+24.5%
operating income (EBIT proxy) over average of 2025-06-30 and 2026-06-30 minus current liabilities
Return on capital employed MPWR
| FY Dec 2025 | +20.7% |
| FY Dec 2024 | +19.9% |
| FY Dec 2023 | +24.1% |
| FY Dec 2022 | +33.4% |
| FY Dec 2021 | +21.7% |
| Jun 2026 | +24.5% |
| Mar 2026 | +21.9% |
| Dec 2025 | +20.7% |
| Sep 2025 | +22.4% |
| Jun 2025 | +22.6% |
| Mar 2025 | +21.8% |
| Dec 2024 | +19.9% |
| Sep 2024 | +21.1% |
At each fiscal year end
Trailing four quarters at each quarter end
P/E, trailing
69.65x
close 2026-10-23 over four quarters of diluted EPS, 2025-07-01 to 2026-06-30
P/E, trailing MPWR
| FY Dec 2025 | 70.53x |
| FY Dec 2024 | 18.15x |
| FY Dec 2023 | 72.01x |
| FY Dec 2022 | 39.12x |
| FY Dec 2021 | 97.69x |
| Jun 2026 | 84.44x |
| Mar 2026 | 78.32x |
| Dec 2025 | 70.53x |
| Sep 2025 | 26.25x |
| Jun 2025 | 21.34x |
| Mar 2025 | 17.30x |
| Dec 2024 | 18.15x |
| Sep 2024 | 104.23x |
At each fiscal year end
Trailing four quarters at each quarter end
Enterprise value
n/a
no debt line filed
Enterprise value MPWR
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
FCF yield
+1.0%
TTM free cash flow over market value at close 2026-10-23
FCF yield MPWR
| FY Dec 2025 | +1.5% |
| FY Dec 2024 | +2.2% |
| FY Dec 2023 | +1.9% |
| FY Dec 2022 | +1.1% |
| FY Dec 2021 | +1.0% |
| Jun 2026 | +0.9% |
| Mar 2026 | +1.2% |
| Dec 2025 | +1.5% |
| Sep 2025 | +1.6% |
| Jun 2025 | +2.0% |
| Mar 2025 | +2.3% |
| Dec 2024 | +2.2% |
| Sep 2024 | +1.5% |
At each fiscal year end
Trailing four quarters at each quarter end
PEG, trailing
n/a
trailing EPS growth -52%, PEG needs growth
PEG, trailing MPWR
| FY Dec 2025 | n/a |
| FY Dec 2024 | 0.07x |
| FY Dec 2023 | n/a |
| FY Dec 2022 | 0.50x |
| FY Dec 2021 | 2.21x |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | 0.09x |
| Jun 2025 | 0.07x |
| Mar 2025 | 0.06x |
| Dec 2024 | 0.07x |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Price as of 2026-10-23. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
| 2025-12 | 2025-09 | 2024-12 | 2023-12 | |
|---|---|---|---|---|
| Revenue | $2.8B | n/a | $2.2B | $1.8B |
| Gross profit | $1.5B | n/a | $1.2B | $1.0B |
| Operating income | $728.6M | n/a | $539.4M | $481.7M |
| Net income | $621.5M | n/a | $1.6B | $427.4M |
| EPS (diluted) | 12.86 | n/a | 32.60 | 8.76 |
| Operating cash flow | $838.2M | n/a | $788.4M | $638.2M |
| Cash | $1.1B | $1.1B | $691.8M | $527.8M |
| Buybacks | $6.6M | n/a | $636.2M | $3.7M |
| Dividends paid | $284.8M | n/a | $240.6M | $185.8M |
SEC XBRL, fiscal years, as known on 2026-10-27
MPWR Stock Sonar score 5/7 axes
Find similar shapesCompareMPWR ranks highest on profitability (89th percentile) and growth (69th), and lowest on institutional and government (3rd), among Semiconductors & Electronics peers.
5 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
MPWR filings, in plain words
Are Monolithic Power Systems insiders buying or selling MPWR?
In the 180 days to 2026-10-27, Monolithic Power Systems insiders were net sellers, a net $233.0M across purchases and sales reported on Form 4, by 9 sellers.
Have members of Congress traded MPWR?
Yes. In the year to 2026-10-27, 0 House members disclosed buying MPWR and 1 House member disclosed selling it; the latest on record is a sale by Byron Donalds dated 2026-06-05.
Are there planned insider sales of MPWR?
Yes. 5 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $40.7M of stock; the latest, by MICHAEL HSING, was filed 2026-09-28.
Read the full summary
In the 180 days to 2026-10-27, Monolithic Power Systems insiders were net sellers of MPWR, a net $233.0M across purchases and sales reported on Form 4 by 9 sellers. 10% of the 79 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. In the year to 2026-10-27, 0 members of Congress disclosed buying MPWR and 1 member disclosed selling it; the latest on record is a sale by Byron Donalds dated 2026-06-05. Insiders filed 5 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $40.7M of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.
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