MPWRNasdaqSemiconductors & Related DevicesFiscal year ends December 31
MONOLITHIC POWER SYSTEMS, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026
$1253.66+42.80 (+3.53%)
Close on Oct 19, 2026
- Market cap
- $61.76B
- P/E (TTM)
- 76.6
- Dividend yield
- 0.50%
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
96.9%
48M of 49M shares
Institutional holders
1,240
217 new, 77 sold out
Net institutional buying
0M
In Q2 2026
Insider trades, 12 months
0 buys · 314 sales
Net sold $729.15M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Abigail P. Johnson | 5,175,259 | 10.50% | 13G (passive) amendment | Jun 30, 2026 |
| BlackRock, Inc. | 4,899,383 | 10.20% | 13G (passive) amendment | Dec 31, 2025 |
| Vanguard Capital Management | 3,561,866 | 7.25% | 13G (passive) | Mar 31, 2026 |
| Vanguard Portfolio Management | 2,528,928 | 5.14% | 13G (passive) | Mar 31, 2026 |
| Invesco Ltd. | 2,510,980 | 5.20% | 13G (passive) | Dec 31, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of MPWR | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,589,925 | 11.37% | $7.73B | −482,542 | 0.11% |
| FMR LLC | 5,177,258 | 10.54% | $7.16B | +776,427 | 0.31% |
| Vanguard Capital Management LLC | 3,126,756 | 6.36% | $4.32B | +43,307 | 0.09% |
| Vanguard Portfolio Management LLC | 2,504,858 | 5.10% | $3.46B | −11,634 | 0.16% |
| Invesco Ltd. | 2,343,930 | 4.77% | $3.24B | −172,057 | 0.26% |
| State Street Corp | 2,282,186 | 4.64% | $3.16B | +93,732 | 0.09% |
| Geode Capital Management, LLC | 1,195,281 | 2.43% | $1.65B | −236,785 | 0.09% |
| Price T Rowe Associates Inc /Md/ | 976,798 | 1.99% | $1.35M | −286,156 | 0.14% |
| Franklin Resources Inc | 811,974 | 1.65% | $1.12B | −116,697 | 0.24% |
| Goldman Sachs Group Inc | 780,650 | 1.59% | $1.08B | +212,586 | 0.09% |
| Norges Bank | 751,399 | 1.53% | $1.04B | New | 0.10% |
| Van Eck Associates Corp | 746,237 | 1.52% | $1.03B | +221,666 | 0.63% |
| Morgan Stanley | 727,885 | 1.48% | $1.01B | +71,518 | 0.05% |
| Bank Of America Corp /De/ | 536,236 | 1.09% | $741.27M | +154,074 | 0.05% |
| Royal Bank of Canada | 487,212 | 0.99% | $673.50M | +13,844 | 0.10% |
| First Trust Advisors LP | 482,781 | 0.98% | $667.38M | −108,572 | 0.39% |
| Northern Trust Corp | 479,492 | 0.98% | $662.83M | −9,628 | 0.08% |
| Barclays PLC | 474,132 | 0.96% | $655.42M | −81,676 | 0.13% |
| Rafferty Asset Management, LLC | 459,278 | 0.93% | $634.89M | +141,805 | 1.45% |
| UBS Group AG | 449,479 | 0.91% | $621.34M | −90,934 | 0.08% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 1,240 | 48M | 96.9% | 217 / 421 | 458 / 77 | 5M | 5M |
| Q1 2026 | 1,121 | 47M | 96.2% | 179 / 383 | 408 / 105 | 9M | 7M |
| Q4 2025 | 1,062 | 52M | 100.0% | 190 / 384 | 352 / 91 | 9M | 5M |
| Q3 2025 | 981 | 48M | 97.1% | 164 / 362 | 317 / 76 | 4M | 4M |
| Q2 2025 | 907 | 48M | 96.7% | 140 / 376 | 300 / 84 | 4M | 3M |
| Q1 2025 | 861 | 47M | 95.3% | 122 / 331 | 309 / 110 | 4M | 4M |
| Q4 2024 | 864 | 47M | 94.7% | 153 / 321 | 291 / 158 | 5M | 6M |
| Q3 2024 | 883 | 47M | 96.5% | 117 / 328 | 323 / 62 | 9M | 4M |
| Q2 2024 | 836 | 48M | 98.2% | 119 / 325 | 283 / 80 | 4M | 4M |
| Q1 2024 | 806 | 48M | 98.0% | 129 / 304 | 274 / 54 | 4M | 3M |
| Q4 2023 | 736 | 47M | 96.1% | 137 / 274 | 245 / 47 | 5M | 3M |
| Q3 2023 | 654 | 46M | 93.8% | 70 / 265 | 240 / 65 | 3M | 4M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of MPWR | Value | % of fund | As of |
|---|---|---|---|---|---|
| Select Semiconductors Portfolio | 1,700,486 | 3.46% | $2.66B | 5.19% | May 31, 2026 |
| Vanguard Total Stock Market Index Fund | 1,481,838 | 3.02% | $2.05B | 0.09% | Jun 30, 2026 |
| Vanguard 500 Index Fund | 1,273,706 | 2.59% | $1.76B | 0.11% | Jun 30, 2026 |
| Invesco QQQ Trust, Series 1 | 1,042,894 | 2.12% | $1.44B | 0.29% | Jun 30, 2026 |
| iShares Semiconductor ETF | 1,013,044 | 2.06% | $1.40B | 2.93% | Jun 30, 2026 |
| Vanguard Mid-Cap Index Fund | 1,011,166 | 2.06% | $1.40B | 0.62% | Jun 30, 2026 |
| VanEck Semiconductor ETF | 680,921 | 1.39% | $941.28M | 1.22% | Jun 30, 2026 |
| iShares Core S&P 500 ETF | 676,390 | 1.38% | $935.01M | 0.11% | Jun 30, 2026 |
| Fidelity Blue Chip Growth Fund | 629,056 | 1.28% | $897.05M | 0.91% | Jul 31, 2026 |
| Fidelity 500 Index Fund | 623,330 | 1.27% | $976.27M | 0.12% | May 31, 2026 |
| Vanguard Growth Index Fund | 531,364 | 1.08% | $734.54M | 0.19% | Jun 30, 2026 |
| MFS Mid Cap Growth Fund | 374,986 | 0.76% | $587.31M | 4.26% | May 31, 2026 |
| Vanguard Information Technology Index Fund | 369,952 | 0.75% | $579.42M | 0.34% | May 31, 2026 |
| Direxion Daily Semiconductor Bull 3X Shares | 361,069 | 0.73% | $514.90M | 2.65% | Jul 31, 2026 |
| Vanguard Mid-Cap Growth Index Fund | 357,562 | 0.73% | $494.28M | 1.42% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Michael Hsing | CEO, Director | 987,352 | 2.01% | Sep 30, 2026 |
| Saria Tseng | EVP & General Counsel | 145,218 | 0.30% | Sep 2, 2026 |
| Robert W. Dean Ii | Interim CFO | 7,154 | 0.01% | Aug 26, 2026 |
| Maurice Sciammas | EVP, WW Sales & Marketing | 234,442 | 0.48% | Aug 6, 2026 |
| Deming Xiao | EVP, Global Operations | 243,254 | 0.49% | May 8, 2026 |
| Theodore Blegen | EVP and CFO | 93,015 | 0.19% | Feb 10, 2026 |
| Kuo Wei Herbert Chang | Director | 515 | 0.00% | Aug 25, 2026 |
| Jeff Zhou | Director | 3,800 | 0.01% | May 27, 2026 |
| Eugen J. Elmiger | Director | 12,477 | 0.03% | May 8, 2026 |
| Eileen Wynne | Director | 1,007 | 0.00% | May 8, 2026 |
| Victor K. Lee | Director | 27,756 | 0.06% | Feb 11, 2026 |
| Carintia Martinez | Director | 1,067 | 0.00% | Feb 5, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −2,949 | $1338.66 | $3.95M | 841,487 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −10,967 | $1351.43 | $14.82M | 818,394 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −6,343 | $1347.15 | $8.54M | 829,361 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −5,783 | $1343.76 | $7.77M | 835,704 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −130 | $1356.94 | $176.40K | 818,264 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −1,111 | $1333.34 | $1.48M | 844,436 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −2,121 | $1328.54 | $2.82M | 845,547 |
| Michael Hsing CEO, Director | Sep 28, 2026 | Sale(10b5-1 plan) | −596 | $1323.31 | $788.69K | 847,668 |
| Saria Tseng EVP & General Counsel | Aug 31, 2026 | Gift | +2,000 | – | – | 2,000 |
| Saria Tseng EVP & General Counsel | Aug 31, 2026 | Gift | −2,000 | – | – | 142,218 |
| Robert W. Dean Ii Interim CFO | Aug 24, 2026 | Other | −5 | – | – | 7,089 |
| Robert W. Dean Ii Interim CFO | Aug 24, 2026 | Sale | −32 | $1297.72 | $41.53K | 7,094 |
| Kuo Wei Herbert Chang Director | Aug 24, 2026 | Sale | −50 | $1281.57 | $64.08K | 515 |
| Robert W. Dean Ii Interim CFO | Aug 17, 2026 | Sale | −6 | $1413.64 | $8.48K | 7,126 |
| Kuo Wei Herbert Chang Director | Aug 11, 2026 | Sale | −50 | $1420.00 | $71.00K | 565 |
| Robert W. Dean Ii Interim CFO | Aug 5, 2026 | Sale | −105 | $1344.27 | $141.15K | 7,132 |
| Maurice Sciammas EVP, WW Sales & Marketing | Aug 4, 2026 | Gift | −25,000 | – | – | 126,644 |
| Maurice Sciammas EVP, WW Sales & Marketing | Aug 4, 2026 | Gift | +25,000 | – | – | 36,062 |
| Maurice Sciammas EVP, WW Sales & Marketing | Aug 3, 2026 | Sale(10b5-1 plan) | −30 | $1343.94 | $40.32K | 1,119 |
| Robert W. Dean Ii Interim CFO | Jul 25, 2026 | Award | +1,359 | – | – | 7,237 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −50 | $1388.19 | $69.41K | 152,084 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −1,506 | $1348.91 | $2.03M | 159,364 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −5,640 | $1352.95 | $7.63M | 153,724 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −50 | $1359.36 | $67.97K | 153,674 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −1,460 | $1339.59 | $1.96M | 162,734 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −776 | $1334.59 | $1.04M | 164,194 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −464 | $1329.30 | $616.80K | 164,970 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −409 | $1323.93 | $541.49K | 165,434 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −274 | $1318.42 | $361.25K | 165,843 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −527 | $1314.03 | $692.49K | 166,117 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −110 | $1405.71 | $154.63K | 151,644 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −117 | $1400.45 | $163.85K | 151,754 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −213 | $1396.16 | $297.38K | 151,871 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −1,864 | $1344.16 | $2.51M | 160,870 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −410 | $1384.11 | $567.49K | 152,134 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −418 | $1378.73 | $576.31K | 152,544 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −472 | $1375.47 | $649.22K | 152,962 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 15, 2026 | Sale(10b5-1 plan) | −240 | $1369.18 | $328.60K | 153,434 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jul 1, 2026 | Sale(10b5-1 plan) | −30 | $1351.61 | $40.55K | 1,149 |
| Maurice Sciammas EVP, WW Sales & Marketing | Jun 1, 2026 | Sale(10b5-1 plan) | −30 | $1533.95 | $46.02K | 1,179 |
| Maurice Sciammas EVP, WW Sales & Marketing | May 29, 2026 | Gift | −12,472 | – | – | 12,625 |
| Saria Tseng EVP & General Counsel | May 27, 2026 | Sale | −7,565 | $1700.00 | $12.86M | 144,218 |
| Robert W. Dean Ii Interim CFO | May 26, 2026 | Sale | −22 | $1649.56 | $36.29K | 5,878 |
| Jeff Zhou Director | May 26, 2026 | Sale | −486 | $1680.00 | $816.48K | 3,800 |
| Saria Tseng EVP & General Counsel | May 22, 2026 | Gift | −200 | – | – | 156,783 |
| Saria Tseng EVP & General Counsel | May 22, 2026 | Sale | −5,000 | $1586.43 | $7.93M | 151,783 |
| Robert W. Dean Ii Interim CFO | May 18, 2026 | Sale | −4 | $1563.28 | $6.25K | 5,900 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −862 | $1491.48 | $1.29M | 856,602 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −352 | $1518.15 | $534.39K | 848,393 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −551 | $1513.11 | $833.72K | 848,745 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −3,769 | $1507.70 | $5.68M | 849,296 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −2,929 | $1503.05 | $4.40M | 853,065 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −608 | $1499.46 | $911.67K | 855,994 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −130 | $1521.43 | $197.79K | 848,263 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −6,688 | $1486.76 | $9.94M | 857,464 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −5,737 | $1482.51 | $8.51M | 864,152 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −4,082 | $1476.96 | $6.03M | 869,889 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −5,049 | $1472.84 | $7.44M | 873,971 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −5,819 | $1467.62 | $8.54M | 879,020 |
| Michael Hsing CEO, Director | May 18, 2026 | Sale | −3,424 | $1462.61 | $5.01M | 884,839 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Hsing Michael Officer, Director | Sep 28, 2026 | 30,000 | $40.35M | Sep 28, 2026 | Performance Shares |
| Robert W. Dean Ii Officer | Aug 24, 2026 | 32 | $41.53K | Aug 24, 2026 | Time-based restricted stock units |
| Robert W. Dean Ii Officer | Aug 17, 2026 | 6 | $8.13K | Aug 17, 2026 | Time-based restricted stock units |
| Wei Chang Kuo Director | Aug 11, 2026 | 100 | $142.00K | Aug 11, 2026 | RSU |
| Dean Robert Officer | Aug 5, 2026 | 105 | $141.15K | Aug 5, 2026 | Performance Shares |
| Sciammas Maurice Officer | Jul 15, 2026 | 15,000 | $20.25M | Jul 15, 2026 | Restricted Stock |
| Bernhard Blegen Theodore Officer | Jun 1, 2026 | 3,001 | $4.63M | Jun 1, 2026 | Performance Shares |
| Tseng Saria Officer | May 28, 2026 | 7,565 | $12.86M | May 27, 2026 | Performance Shares |
| Robert W. Dean Ii Officer | May 26, 2026 | 22 | $35.88K | May 26, 2026 | Time-based restricted stock units |
| Zhou Jeff Director | May 26, 2026 | 486 | $816.48K | May 26, 2026 | Restricted Stock |
| Tseng Saria Officer | May 22, 2026 | 5,000 | $7.93M | May 22, 2026 | Performance Shares |
| Robert W. Dean Ii Officer | May 18, 2026 | 4 | $6.25K | May 18, 2026 | Time-based restricted stock units |
| Hsing Michael Officer, Director | May 18, 2026 | 40,000 | $59.31M | May 18, 2026 | Performance Shares |
| Sciammas Maurice Officer | May 15, 2026 | 12,000 | $18.74M | May 15, 2026 | Performance Shares |
| Eugen J. Elmiger Director | May 6, 2026 | 12,000 | $19.83M | May 7, 2026 | Restricted Stock Units |