Monolithic Power Systems, Inc. (MPWR) shareholders
MPWRNasdaqSemiconductors & Related DevicesFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Nov 3, 2026Score 18/30101% above fair value
$1390.54−56.86 (-3.93%)
Close on Nov 13, 2026Market cap $68.34BP/E 84.9Yield 0.45%
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 · 255 sales
Net sold $650.43M
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 |
|---|---|---|---|---|
| BlackRock, Inc. | 4,899,383 | 10.20% | 13G (passive) amendment | Dec 31, 2025 |
| FMR LLC Joint filing with Abigail P. Johnson (9.10%) | 4,450,334 | 9.10% | 13G (passive) amendment | Sep 30, 2026 |
| 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 |
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% | $1.35B | −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)
1,030 funds held MPWR in Q2 2026, 48% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| 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 |
| Frank Anthony Balow III | Chief Financial Officer | 2,921 | 0.01% | Nov 13, 2026 |
| Maurice Sciammas | EVP, WW Sales & Marketing | 234,450 | 0.48% | Nov 5, 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 |
| 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 |
|---|---|---|---|---|---|---|
| Frank Anthony Balow III Chief Financial Officer | Nov 11, 2026 | Sale(10b5-1 plan) | −20 | $1434.31 | $28.69K | 2,921 |
| Maurice Sciammas EVP, WW Sales & Marketing | Nov 3, 2026 | Gift | +13,000 | – | – | 49,062 |
| Maurice Sciammas EVP, WW Sales & Marketing | Nov 3, 2026 | Gift | −13,000 | – | – | 113,652 |
| 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 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
3.36%
2M shares short
Days to cover
1.7
At 1M shares a day
Change since last report
-0.8%
From 2M shares
Short volume, 20 days
38.1%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Monolithic Power Systems's stock actually held short. Settlement fails (shares not delivered on time) peaked at 2,314 shares on Oct 13, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Michael Hsing 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 |
| Kuo Wei Herbert Chang Director | Aug 11, 2026 | 100 | $142.00K | Aug 11, 2026 | RSU |
| Robert W. Dean Ii Officer | Aug 5, 2026 | 105 | $141.15K | Aug 5, 2026 | Performance Shares |
| Maurice Sciammas Officer | Jul 15, 2026 | 15,000 | $20.25M | Jul 15, 2026 | Restricted Stock |
| Theodore Blegen Officer | Jun 1, 2026 | 3,001 | $4.63M | Jun 1, 2026 | Performance Shares |
| Saria Tseng 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 |
| Jeff Zhou Director | May 26, 2026 | 486 | $816.48K | May 26, 2026 | Restricted Stock |
| Saria Tseng 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 |
| Michael Hsing Officer, Director | May 18, 2026 | 40,000 | $59.31M | May 18, 2026 | Performance Shares |
| Maurice Sciammas 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 |
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