MONOLITHIC POWER SYSTEMS INC
MPWR · Semiconductors & Related Devices · 49.1M shares · +2%/yr ↑ shares · EDGAR filings ↗
Net buyback after stock comp: -$146M (gross $4M, SBC $150M)
Reference price $1,533.95 · est. market cap ~$75.4B — last insider sale, 2026-06-01 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)
Grade
A85gen composite 83pct→85
Notable findings
- Restatement• risks in connection with our internal control over financial reporting, the identified material weakness and the restatement of our prior financial statements; • our failure to comply with var 8-K ↗
- Material weaknessthe Company’s ability to timely and adequately remediate its material weakness; and other important risk factors identified under the caption “Risk Factors” and elsewhere in our Securities and Exchang
- Fund exitedNotable fund(s) exited this quarter: VANGUARD GROUP INC
- Exec changeRecent 8-K item 5.02 8-K ↗
- Customer concentration~92% of revenue from one customer/distributor — For the year ended December 31, 2025, 92% of our total revenue was from customers in Asia
- Strong balance sheetStrong balance sheet — $1.3B cash & investments
- Notable holderHeld by 5 notable fund(s): FMR LLC, STATE STREET CORP, GOLDMAN SACHS GROUP INC +2 more (as of 2026-03-31)
- Insider sellingInsider selling — 134 open-market sale(s) by 10 insider(s) (cluster of 10 insiders, ~$511M, last 6mo) Form 4 ↗
- AccumulatingInstitutional holders rose 15→19 QoQ (2025-12-31→2026-03-31)
- China exposure• our failure to comply with various governmental laws and regulations, including anti-corruption laws, export control laws, environmental laws, regulation and reporting standards related to environ
Quarterly revenue
Last 4 quarters · from SEC filings.
Key metrics
Gross margin
55.2%
Operating margin
26.1%
Net margin
22.3%
Return on equity
17.6%
Return on assets
14.8%
ROIC
16.3%
Revenue growth (QoQ)
26.1%
Current ratio
5.9×
Free cash flow
$666M
EBITDA
$781M
Tangible book value
$3.5B
Cash & investments
$1.3B
Stock comp / revenue
8.2%
Leadership & compensation
| Name | Role | Latest total comp |
|---|---|---|
| Michael Hsing | CEO | $20M FY2025 |
| Bernie Blegen | Officer | $7M FY2025 |
| DEAN ROBERT W II | Interim CFO | — |
| Deming Xiao | EVP, Global Operations | $9M FY2025 |
| Maurice Sciammas | EVP, WW Sales & Marketing | $9M FY2025 |
| Saria Tseng | EVP & General Counsel | $9M FY2025 |
| Carintia Martinez | Director | $320K FY2025 |
| Eileen Wynne | Director | $331K FY2025 |
| Eugen Elmiger | Director | $332K FY2025 |
| Herbert Chang | Director | $370K FY2025 |
| Jeff Zhou | Director | $330K FY2025 |
| Victor K. Lee | Director | $324K FY2025 |
Officers & directors from SEC filings (Form 4 + DEF 14A proxy); compensation is the latest reported fiscal year.
Insider transactions · last 6 months
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-06-01 | Sciammas Maurice | Sell | 30 | $1,533.95 |
| 2026-05-29 | Sciammas Maurice | Gift | 12K | — |
| 2026-05-27 | Tseng Saria | Sell | 7.6K | $1,700.00 |
| 2026-05-26 | Zhou Jeff | Sell | 486 | $1,680.00 |
| 2026-05-26 | DEAN ROBERT W II | Sell | 22 | $1,649.56 |
| 2026-05-22 | Tseng Saria | Gift | 200 | — |
| 2026-05-22 | Tseng Saria | Sell | 5.0K | $1,586.43 |
| 2026-05-18 | Hsing Michael | Sell | 862 | $1,491.48 |
| 2026-05-18 | Hsing Michael | Sell | 608 | $1,499.46 |
| 2026-05-18 | Hsing Michael | Sell | 2.9K | $1,503.05 |
| 2026-05-18 | Hsing Michael | Sell | 551 | $1,513.11 |
| 2026-05-18 | Hsing Michael | Sell | 352 | $1,518.15 |
| 2026-05-18 | Hsing Michael | Sell | 130 | $1,521.43 |
| 2026-05-18 | DEAN ROBERT W II | Sell | 4 | $1,563.28 |
| 2026-05-18 | Hsing Michael | Sell | 3.8K | $1,507.70 |
| 2026-05-18 | Hsing Michael | Sell | 3.4K | $1,462.61 |
| 2026-05-18 | Hsing Michael | Sell | 5.8K | $1,467.62 |
| 2026-05-18 | Hsing Michael | Sell | 5.0K | $1,472.84 |
| 2026-05-18 | Hsing Michael | Sell | 4.1K | $1,476.96 |
| 2026-05-18 | Hsing Michael | Sell | 5.7K | $1,482.51 |
| 2026-05-18 | Hsing Michael | Sell | 6.7K | $1,486.76 |
| 2026-05-15 | Sciammas Maurice | Sell | 3.7K | $1,550.36 |
| 2026-05-15 | Sciammas Maurice | Sell | 1.7K | $1,557.48 |
| 2026-05-15 | Sciammas Maurice | Sell | 2.0K | $1,562.01 |
| 2026-05-15 | Sciammas Maurice | Sell | 2.0K | $1,567.15 |
| 2026-05-15 | Sciammas Maurice | Sell | 1.3K | $1,571.49 |
| 2026-05-15 | Sciammas Maurice | Sell | 703 | $1,577.75 |
| 2026-05-15 | Sciammas Maurice | Sell | 447 | $1,582.21 |
| 2026-05-15 | Sciammas Maurice | Sell | 50 | $1,585.51 |
| 2026-05-13 | Sciammas Maurice | Gift | 1.6K | — |
| 2026-05-13 | Sciammas Maurice | Gift | 1.6K | — |
| 2026-05-13 | DEAN ROBERT W II | Other | 2.2K | — |
| 2026-05-06 | Elmiger Eugen J | Sell | 2.6K | $1,586.81 |
| 2026-05-06 | Elmiger Eugen J | Sell | 320 | $1,559.88 |
| 2026-05-06 | Elmiger Eugen J | Sell | 814 | $1,566.36 |
| 2026-05-06 | Elmiger Eugen J | Sell | 1.1K | $1,571.58 |
| 2026-05-06 | Elmiger Eugen J | Sell | 834 | $1,575.57 |
| 2026-05-06 | Elmiger Eugen J | Sell | 1.9K | $1,581.81 |
| 2026-05-06 | Elmiger Eugen J | Sell | 1.4K | $1,591.38 |
| 2026-05-06 | Elmiger Eugen J | Sell | 2.6K | $1,596.42 |
| 2026-05-06 | Elmiger Eugen J | Sell | 514 | $1,600.14 |
| 2026-05-06 | Xiao Deming | Sell | 3.3K | $1,648.38 |
| 2026-05-06 | Xiao Deming | Sell | 14K | $1,652.80 |
| 2026-05-06 | Xiao Deming | Sell | 12K | $1,657.93 |
| 2026-05-06 | Xiao Deming | Sell | 907 | $1,661.38 |
| 2026-05-06 | Wynne Eileen | Sell | 335 | $1,582.68 |
| 2026-05-06 | Zhou Jeff | Sell | 500 | $1,650.00 |
| 2026-05-05 | Zhou Jeff | Sell | 500 | $1,600.00 |
| 2026-05-05 | Sciammas Maurice | Sell | 380 | $1,583.81 |
| 2026-05-05 | Zhou Jeff | Sell | 514 | $1,574.48 |
| 2026-05-04 | Sciammas Maurice | Sell | 30 | $1,588.73 |
| 2026-04-08 | Tseng Saria | Sell | 560 | $1,266.48 |
| 2026-04-08 | Tseng Saria | Sell | 360 | $1,270.29 |
| 2026-04-08 | Tseng Saria | Sell | 240 | $1,279.55 |
| 2026-04-08 | Tseng Saria | Sell | 120 | $1,287.12 |
| 2026-04-08 | Tseng Saria | Sell | 400 | $1,292.08 |
| 2026-04-08 | Tseng Saria | Sell | 800 | $1,302.52 |
| 2026-04-08 | Tseng Saria | Sell | 1.3K | $1,308.30 |
| 2026-04-08 | Tseng Saria | Sell | 4.2K | $1,312.82 |
| 2026-04-08 | Tseng Saria | Sell | 840 | $1,319.25 |
| 2026-04-08 | Tseng Saria | Sell | 120 | $1,321.94 |
| 2026-04-06 | Tseng Saria | Sell | 244 | $1,139.96 |
| 2026-04-06 | Tseng Saria | Sell | 556 | $1,144.42 |
| 2026-04-06 | Tseng Saria | Sell | 480 | $1,149.05 |
| 2026-04-06 | Tseng Saria | Sell | 560 | $1,159.62 |
| 2026-04-06 | Tseng Saria | Sell | 684 | $1,165.66 |
| 2026-04-06 | Tseng Saria | Sell | 2.0K | $1,170.38 |
| 2026-04-06 | Tseng Saria | Sell | 1.7K | $1,176.35 |
| 2026-04-06 | Tseng Saria | Sell | 1.4K | $1,179.50 |
| 2026-04-01 | Tseng Saria | Sell | 576 | $1,131.24 |
| 2026-04-01 | Tseng Saria | Sell | 184 | $1,132.15 |
| 2026-04-01 | Tseng Saria | Sell | 160 | $1,134.14 |
| 2026-04-01 | Tseng Saria | Sell | 188 | $1,135.91 |
| 2026-04-01 | Sciammas Maurice | Sell | 30 | $1,116.44 |
| 2026-04-01 | Tseng Saria | Sell | 292 | $1,136.99 |
| 2026-03-30 | Tseng Saria | Sell | 5.2K | $1,000.81 |
| 2026-03-30 | Tseng Saria | Sell | 9.1K | $1,005.18 |
| 2026-03-30 | Tseng Saria | Sell | 3.4K | $1,009.63 |
| 2026-03-30 | Tseng Saria | Sell | 3.2K | $1,017.22 |
| 2026-03-30 | Tseng Saria | Sell | 2.2K | $1,023.00 |
| 2026-03-30 | Tseng Saria | Sell | 2.4K | $1,029.21 |
| 2026-03-30 | Tseng Saria | Sell | 166 | $1,035.60 |
| 2026-03-30 | Tseng Saria | Sell | 80 | $1,041.12 |
| 2026-03-20 | Sciammas Maurice | Sell | 30 | $1,095.07 |
| 2026-02-12 | Hsing Michael | Sell | 13K | $1,155.71 |
| 2026-02-12 | Hsing Michael | Sell | 5.0K | $1,159.84 |
| 2026-02-12 | Hsing Michael | Sell | 4.0K | $1,164.92 |
| 2026-02-12 | Hsing Michael | Sell | 2.1K | $1,168.80 |
| 2026-02-12 | Hsing Michael | Sell | 200 | $1,173.39 |
| 2026-02-12 | Hsing Michael | Sell | 480 | $1,180.79 |
| 2026-02-12 | Hsing Michael | Sell | 160 | $1,188.23 |
| 2026-02-12 | Hsing Michael | Sell | 600 | $1,194.34 |
| 2026-02-12 | Hsing Michael | Sell | 1.4K | $1,200.81 |
| 2026-02-12 | Hsing Michael | Sell | 3.6K | $1,205.82 |
| 2026-02-12 | Hsing Michael | Sell | 1.2K | $1,210.11 |
| 2026-02-12 | Hsing Michael | Sell | 1.4K | $1,217.12 |
| 2026-02-11 | Hsing Michael | Sell | 363 | $1,158.71 |
| 2026-02-11 | Hsing Michael | Sell | 1.4K | $1,163.71 |
| 2026-02-11 | Hsing Michael | Sell | 1.5K | $1,167.62 |
| 2026-02-11 | Hsing Michael | Sell | 2.0K | $1,172.92 |
| 2026-02-11 | Hsing Michael | Sell | 2.8K | $1,177.67 |
| 2026-02-11 | Hsing Michael | Sell | 1.5K | $1,182.82 |
| 2026-02-11 | Hsing Michael | Sell | 2.1K | $1,188.17 |
| 2026-02-11 | Hsing Michael | Sell | 6.1K | $1,192.67 |
| 2026-02-11 | Hsing Michael | Sell | 15K | $1,197.20 |
| 2026-02-11 | Hsing Michael | Sell | 649 | $1,202.28 |
| 2026-02-11 | Sciammas Maurice | Sell | 200 | $1,179.97 |
| 2026-02-10 | Hsing Michael | Sell | 4.3K | $1,132.01 |
| 2026-02-10 | Hsing Michael | Sell | 6.3K | $1,136.75 |
| 2026-02-10 | Hsing Michael | Sell | 16K | $1,141.88 |
| 2026-02-10 | Hsing Michael | Sell | 3.9K | $1,145.90 |
| 2026-02-10 | Hsing Michael | Sell | 1.2K | $1,151.11 |
| 2026-02-10 | Hsing Michael | Sell | 694 | $1,154.96 |
| 2026-02-10 | Hsing Michael | Sell | 360 | $1,161.41 |
| 2026-02-10 | Hsing Michael | Sell | 880 | $1,176.04 |
| 2026-02-10 | Hsing Michael | Sell | 280 | $1,197.26 |
| 2026-02-09 | Lee Victor K | Sell | 400 | $1,212.16 |
| 2026-02-06 | Xiao Deming | Sell | 23K | $1,171.16 |
| 2026-02-06 | Tseng Saria | Sell | 23K | $1,171.16 |
| 2026-02-06 | Sciammas Maurice | Sell | 23K | $1,171.16 |
| 2026-02-06 | BLEGEN THEODORE | Sell | 22K | $1,171.16 |
| 2026-02-06 | Hsing Michael | Sell | 55K | $1,171.16 |
| 2026-02-03 | Wynne Eileen | Grant | 189 | — |
| 2026-02-03 | Zhou Jeff | Grant | 189 | — |
| 2026-02-03 | CHANG KUO WEI HERBERT | Grant | 189 | — |
| 2026-02-03 | Elmiger Eugen J | Grant | 189 | — |
| 2026-02-03 | Lee Victor K | Grant | 189 | — |
| 2026-02-03 | Martinez Carintia | Grant | 189 | — |
| 2026-02-03 | Xiao Deming | Grant | 57K | — |
| 2026-02-03 | BLEGEN THEODORE | Grant | 39K | — |
| 2026-02-03 | Tseng Saria | Grant | 57K | — |
| 2026-02-03 | Hsing Michael | Grant | 137K | — |
| 2026-02-03 | Sciammas Maurice | Grant | 57K | — |
| 2026-02-02 | BLEGEN THEODORE | Sell | 220 | $1,110.58 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 40 | $1,117.11 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 80 | $1,120.77 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 40 | $1,122.56 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 200 | $1,126.58 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 80 | $1,127.39 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 240 | $1,128.43 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 240 | $1,129.28 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 320 | $1,130.48 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 198 | $1,131.70 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 322 | $1,132.67 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 379 | $1,133.47 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 241 | $1,134.41 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 120 | $1,135.49 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 120 | $1,136.35 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 80 | $1,137.81 |
| 2026-02-02 | BLEGEN THEODORE | Sell | 80 | $1,139.49 |
All non-derivative Form 4 activity (SEC), newest first.
Notable events (8-K)
| Date | Items | |
|---|---|---|
| 2026-06-12 | Shareholder voteOtherExhibits | filing ↗ |
| 2026-04-30 | ResultsExhibits | filing ↗ |
| 2026-02-27 | Non-reliance/restatement | filing ↗ |
| 2026-02-05 | ResultsExec/director changeOtherExhibits | filing ↗ |
| 2025-12-12 | OtherExhibits | filing ↗ |
| 2025-11-21 | 5.03Exhibits | filing ↗ |
| 2025-10-30 | ResultsExhibits | filing ↗ |
| 2025-09-11 | OtherExhibits | filing ↗ |
Recent filings
| Form | Filed | Period | Accession |
|---|---|---|---|
| 8-K | 2026-06-12 | 2026-06-11 | 0001628280-26-042820 ↗ |
| 10-Q | 2026-05-04 | 2026-03-31 | 0001437749-26-014647 ↗ |
| 8-K | 2026-04-30 | 2026-04-30 | 0001437749-26-014182 ↗ |
| DEF 14A | 2026-04-30 | 2026-06-11 | 0001437749-26-014084 ↗ |
| 10-K | 2026-02-27 | 2025-12-31 | 0001437749-26-006113 ↗ |
| 8-K | 2026-02-27 | 2026-02-26 | 0001437749-26-006112 ↗ |
| 8-K | 2026-02-05 | 2026-02-03 | 0001437749-26-003191 ↗ |
| 8-K | 2025-12-12 | 2025-12-12 | 0001437749-25-037726 ↗ |
| 8-K | 2025-11-21 | 2025-11-19 | 0001437749-25-035995 ↗ |
| 10-Q | 2025-11-05 | 2025-09-30 | 0001437749-25-033332 ↗ |
| 8-K | 2025-10-30 | 2025-10-30 | 0001437749-25-032411 ↗ |
| 8-K | 2025-09-11 | 2025-09-11 | 0001437749-25-028841 ↗ |