Monolithic Power Systems (MPWR)
Monolithic Power Systems on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.
1.6M
Short interest
settlement 2026-10-15
2.3
Days to cover
unchanged vs prior
32.2%
Short share of volume
2026-10-28
40
Fails to deliver
settlement 2026-09-21
Thu 29 Oct
Next earnings
estimated date
-$40.7M
Insider flow, 90 days
0 buys, 14 sells
As of 2026-10-28.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in MPWR is 1,602,872 shares, down 303,967 shares over the last month. Over the last 48 readings it ranged from 1,494,353 shares (31 October 2024) to 2,855,358 shares (31 December 2025). The latest reading sits at the bottom of that range. At the reported average volume of 688K shares a day that is 2.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 1,602,872 | -13.8% | 688,277 | 2.33 |
| 2026-09-30 | 1,858,921 | -2.5% | 799,004 | 2.33 |
| 2026-09-15 | 1,906,839 | -4.6% | 606,859 | 3.14 |
| 2026-08-31 | 1,998,007 | +8.6% | 603,244 | 3.31 |
| 2026-08-14 | 1,839,078 | -13.3% | 672,561 | 2.73 |
| 2026-07-31 | 2,122,311 | -13.6% | 997,500 | 2.13 |
| 2026-07-15 | 2,456,955 | +11.0% | 919,274 | 2.67 |
| 2026-06-30 | 2,214,362 | -5.7% | 1,475,639 | 1.50 |
| 2026-06-15 | 2,348,322 | +1.2% | 772,017 | 3.04 |
| 2026-05-29 | 2,319,453 | +17.4% | 709,701 | 3.27 |
| 2026-05-15 | 1,975,414 | +14.8% | 643,825 | 3.07 |
| 2026-04-30 | 1,720,835 | -5.7% | 622,834 | 2.76 |
| 2026-04-15 | 1,825,570 | -8.1% | 539,070 | 3.39 |
| 2026-03-31 | 1,985,296 | -0.1% | 536,074 | 3.70 |
| 2026-03-13 | 1,987,899 | -3.2% | 564,435 | 3.52 |
| 2026-02-27 | 2,054,245 | -2.2% | 452,007 | 4.54 |
| 2026-02-13 | 2,099,811 | -8.9% | 844,053 | 2.49 |
| 2026-01-30 | 2,304,227 | -0.4% | 615,553 | 3.74 |
| 2026-01-15 | 2,313,245 | -19.0% | 522,096 | 4.43 |
| 2025-12-31 | 2,855,358 | +65.0% | 917,722 | 3.11 |
| 2025-12-15 | 1,729,984 | -6.5% | 523,443 | 3.31 |
| 2025-11-28 | 1,850,349 | +3.0% | 732,879 | 2.52 |
| 2025-11-14 | 1,796,489 | +7.7% | 663,569 | 2.71 |
| 2025-10-31 | 1,667,795 | -11.4% | 684,845 | 2.44 |
| 2025-10-15 | 1,881,672 | -8.3% | 567,843 | 3.31 |
| 2025-09-30 | 2,051,204 | +26.7% | 502,060 | 4.09 |
| 2025-09-15 | 1,619,039 | -15.7% | 464,048 | 3.49 |
| 2025-08-29 | 1,920,230 | -17.2% | 483,397 | 3.97 |
| 2025-08-15 | 2,319,594 | -3.4% | 746,549 | 3.11 |
| 2025-07-31 | 2,401,819 | -1.3% | 548,037 | 4.38 |
| 2025-07-15 | 2,434,201 | +5.8% | 496,748 | 4.90 |
| 2025-06-30 | 2,300,158 | +21.5% | 551,162 | 4.17 |
| 2025-06-13 | 1,893,692 | -3.1% | 564,942 | 3.35 |
| 2025-05-30 | 1,955,312 | -20.0% | 539,023 | 3.63 |
| 2025-05-15 | 2,445,033 | +20.9% | 869,959 | 2.81 |
| 2025-04-30 | 2,021,634 | -23.1% | 824,141 | 2.45 |
| 2025-04-15 | 2,630,420 | +7.2% | 1,517,107 | 1.73 |
| 2025-03-31 | 2,452,999 | +6.7% | 960,430 | 2.55 |
| 2025-03-14 | 2,299,084 | -11.7% | 852,417 | 2.70 |
| 2025-02-28 | 2,602,443 | -4.3% | 871,083 | 2.99 |
| 2025-02-14 | 2,719,973 | -0.9% | 997,226 | 2.73 |
| 2025-01-31 | 2,744,323 | +5.8% | 996,529 | 2.75 |
| 2025-01-15 | 2,594,479 | -9.0% | 649,303 | 4.00 |
| 2024-12-31 | 2,852,221 | +22.7% | 796,039 | 3.58 |
| 2024-12-13 | 2,324,251 | +11.1% | 811,782 | 2.86 |
| 2024-11-29 | 2,092,966 | -16.8% | 1,129,334 | 1.85 |
| 2024-11-15 | 2,515,277 | +68.3% | 1,541,905 | 1.63 |
| 2024-10-31 | 1,494,353 | +15.7% | 752,580 | 1.99 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 28 October 2026, the short share of MPWR volume is 32.2%, down 6.1 points over the last five sessions. Over the last 30 readings it ranged from 26.1% (26 October 2026) to 68.4% (7 October 2026). The latest reading is 16.9 points below the 30-session average of 49.1%, on 194K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-28 | 62K | 194K | 32.2% | 16 |
| 2026-10-27 | 78K | 221K | 35.2% | 0 |
| 2026-10-26 | 65K | 249K | 26.1% | 10 |
| 2026-10-23 | 86K | 220K | 39.0% | 4,110 |
| 2026-10-22 | 185K | 411K | 45.1% | 230 |
| 2026-10-21 | 82K | 214K | 38.3% | 22 |
| 2026-10-20 | 79K | 185K | 43.0% | 99 |
| 2026-10-19 | 123K | 345K | 35.5% | 8 |
| 2026-10-16 | 103K | 223K | 46.3% | 81 |
| 2026-10-15 | 127K | 293K | 43.4% | 1 |
| 2026-10-14 | 131K | 309K | 42.3% | 5 |
| 2026-10-13 | 82K | 209K | 39.4% | 50 |
| 2026-10-12 | 65K | 235K | 27.6% | 73 |
| 2026-10-09 | 59K | 161K | 36.6% | 11 |
| 2026-10-08 | 111K | 222K | 49.8% | 17 |
| 2026-10-07 | 83K | 122K | 68.4% | 1 |
| 2026-10-06 | 77K | 125K | 61.7% | 232 |
| 2026-10-05 | 172K | 271K | 63.4% | 1 |
| 2026-10-02 | 155K | 278K | 55.8% | 61 |
| 2026-10-01 | 78K | 143K | 54.4% | 8 |
| 2026-09-30 | 60K | 117K | 51.0% | 89 |
| 2026-09-29 | 73K | 130K | 55.8% | 0 |
| 2026-09-28 | 102K | 163K | 62.5% | 2 |
| 2026-09-25 | 80K | 137K | 58.4% | 264 |
| 2026-09-24 | 77K | 122K | 62.6% | 28 |
| 2026-09-23 | 153K | 240K | 63.7% | 0 |
| 2026-09-22 | 270K | 474K | 57.0% | 113 |
| 2026-09-21 | 176K | 273K | 64.5% | 155 |
| 2026-09-18 | 139K | 244K | 57.1% | 8 |
| 2026-09-17 | 96K | 167K | 57.3% | 70 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 21 September 2026, the fails-to-deliver balance in MPWR is 40 shares, unchanged over the last settlement date. Over the last 30 readings it ranged from 1 share (15 April 2026) to 151,827 shares (29 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-21 | 40 | $1217.80 | $49K |
| 2026-09-17 | 40 | $1147.61 | $46K |
| 2026-08-13 | 41 | $1425.01 | $58K |
| 2026-08-03 | 1 | $1426.03 | $1K |
| 2026-07-17 | 38 | $1305.65 | $50K |
| 2026-07-10 | 665 | $1374.13 | $914K |
| 2026-07-02 | 224 | $1331.73 | $298K |
| 2026-07-01 | 7,880 | $1382.36 | $10.9M |
| 2026-06-30 | 7,906 | $1312.77 | $10.4M |
| 2026-06-29 | 151,827 | $1313.32 | $199.4M |
| 2026-06-25 | 31 | $1434.95 | $44K |
| 2026-06-22 | 8,983 | $1563.70 | $14.0M |
| 2026-06-18 | 214 | $1448.21 | $310K |
| 2026-06-16 | 17,033 | $1652.29 | $28.1M |
| 2026-06-15 | 155 | $1577.32 | $244K |
| 2026-06-12 | 3,945 | $1589.55 | $6.3M |
| 2026-06-11 | 11,381 | $1473.04 | $16.8M |
| 2026-06-09 | 725 | $1559.18 | $1.1M |
| 2026-05-29 | 573 | $1633.17 | $936K |
| 2026-05-19 | 150 | $1486.33 | $223K |
| 2026-05-18 | 500 | $1550.02 | $775K |
| 2026-05-14 | 3 | $1650.35 | $5K |
| 2026-05-07 | 170 | $1652.35 | $281K |
| 2026-05-01 | 1,894 | $1614.41 | $3.1M |
| 2026-04-24 | 421 | $1592.17 | $670K |
| 2026-04-20 | 282 | $1468.35 | $414K |
| 2026-04-16 | 1,210 | $1353.00 | $1.6M |
| 2026-04-15 | 1 | $1363.42 | $1K |
| 2026-04-10 | 7,315 | $1334.21 | $9.8M |
| 2026-04-02 | 199 | $1119.51 | $223K |
Insider trades
SEC Form 4, newest first. JSONInsiders at MPWR reported 14 open-market sells worth $40.7M in the last 90 days and no open-market buys. Latest filing: Hsing Michael (CEO) on 2026-09-28.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-28 | Hsing Michael | CEO | Sell | 130 | $1356.94 | $176K | 818K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 11K | $1351.43 | $14.8M | 818K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 6K | $1347.15 | $8.5M | 829K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 6K | $1343.76 | $7.8M | 836K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 3K | $1338.66 | $3.9M | 841K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 1K | $1333.34 | $1.5M | 844K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 2K | $1328.54 | $2.8M | 846K |
| 2026-09-28 | Hsing Michael | CEO | Sell | 596 | $1323.31 | $789K | 848K |
| 2026-08-31 | Tseng Saria | EVP & General Counsel | Gift | 2K | $0.00 | $0 | 2K |
| 2026-08-31 | Tseng Saria | EVP & General Counsel | Gift | 2K | $0.00 | $0 | 142K |
| 2026-08-24 | DEAN ROBERT W II | Interim CFO | Other transaction | 5 | $0.00 | $0 | 7K |
| 2026-08-24 | DEAN ROBERT W II | Interim CFO | Sell | 32 | $1297.72 | $42K | 7K |
| 2026-08-24 | CHANG KUO WEI HERBERT | Director | Sell | 50 | $1281.57 | $64K | 515 |
| 2026-08-17 | DEAN ROBERT W II | Interim CFO | Sell | 6 | $1413.64 | $8K | 7K |
| 2026-08-11 | CHANG KUO WEI HERBERT | Director | Sell | 50 | $1420.00 | $71K | 565 |
| 2026-08-05 | DEAN ROBERT W II | Interim CFO | Sell | 105 | $1344.27 | $141K | 7K |
| 2026-08-04 | Sciammas Maurice | EVP, WW Sales & Marketing | Gift | 25K | $0.00 | $0 | 36K |
| 2026-08-04 | Sciammas Maurice | EVP, WW Sales & Marketing | Gift | 25K | $0.00 | $0 | 127K |
| 2026-08-03 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 30 | $1343.94 | $40K | 1K |
| 2026-07-25 | DEAN ROBERT W II | Interim CFO | Grant | 1K | $0.00 | $0 | 7K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 50 | $1388.19 | $69K | 152K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 110 | $1405.71 | $155K | 152K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 117 | $1400.45 | $164K | 152K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 213 | $1396.16 | $297K | 152K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 410 | $1384.11 | $567K | 152K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 418 | $1378.73 | $576K | 153K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 472 | $1375.47 | $649K | 153K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 240 | $1369.18 | $329K | 153K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 50 | $1359.36 | $68K | 154K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 6K | $1352.95 | $7.6M | 154K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 2K | $1348.91 | $2.0M | 159K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 2K | $1344.16 | $2.5M | 161K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 1K | $1339.59 | $2.0M | 163K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 776 | $1334.59 | $1.0M | 164K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 464 | $1329.30 | $617K | 165K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 409 | $1323.93 | $541K | 165K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 274 | $1318.42 | $361K | 166K |
| 2026-07-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 527 | $1314.03 | $692K | 166K |
| 2026-07-01 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 30 | $1351.61 | $41K | 1K |
| 2026-06-01 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 30 | $1533.95 | $46K | 1K |
| 2026-05-29 | Sciammas Maurice | EVP, WW Sales & Marketing | Gift | 12K | $0.00 | $0 | 13K |
| 2026-05-27 | Tseng Saria | EVP & General Counsel | Sell | 8K | $1700.00 | $12.9M | 144K |
| 2026-05-26 | Zhou Jeff | Director | Sell | 486 | $1680.00 | $816K | 4K |
| 2026-05-26 | DEAN ROBERT W II | Interim CFO | Sell | 22 | $1649.56 | $36K | 6K |
| 2026-05-22 | Tseng Saria | EVP & General Counsel | Sell | 5K | $1586.43 | $7.9M | 152K |
| 2026-05-22 | Tseng Saria | EVP & General Counsel | Gift | 200 | $0.00 | $0 | 157K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 130 | $1521.43 | $198K | 848K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 352 | $1518.15 | $534K | 848K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 551 | $1513.11 | $834K | 849K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 4K | $1507.70 | $5.7M | 849K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 3K | $1503.05 | $4.4M | 853K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 608 | $1499.46 | $912K | 856K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 862 | $1491.48 | $1.3M | 857K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 7K | $1486.76 | $9.9M | 857K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 6K | $1482.51 | $8.5M | 864K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 4K | $1476.96 | $6.0M | 870K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 5K | $1472.84 | $7.4M | 874K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 6K | $1467.62 | $8.5M | 879K |
| 2026-05-18 | Hsing Michael | CEO | Sell | 3K | $1462.61 | $5.0M | 885K |
| 2026-05-18 | DEAN ROBERT W II | Interim CFO | Sell | 4 | $1563.28 | $6K | 6K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 50 | $1585.51 | $79K | 167K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 447 | $1582.21 | $707K | 167K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 703 | $1577.75 | $1.1M | 167K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 1K | $1571.49 | $2.1M | 168K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 2K | $1567.15 | $3.2M | 169K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 2K | $1562.01 | $3.1M | 171K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 2K | $1557.48 | $2.7M | 173K |
| 2026-05-15 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 4K | $1550.36 | $5.8M | 175K |
| 2026-05-13 | Sciammas Maurice | EVP, WW Sales & Marketing | Gift | 2K | $0.00 | $0 | 51K |
| 2026-05-13 | Sciammas Maurice | EVP, WW Sales & Marketing | Gift | 2K | $0.00 | $0 | 25K |
| 2026-05-13 | DEAN ROBERT W II | Interim CFO | Other transaction | 2K | $0.00 | $0 | 6K |
| 2026-05-06 | Zhou Jeff | Director | Sell | 500 | $1650.00 | $825K | 4K |
| 2026-05-06 | Xiao Deming | EVP, Global Operations | Sell | 907 | $1661.38 | $1.5M | 206K |
| 2026-05-06 | Xiao Deming | EVP, Global Operations | Sell | 12K | $1657.93 | $19.2M | 207K |
| 2026-05-06 | Xiao Deming | EVP, Global Operations | Sell | 14K | $1652.80 | $23.4M | 218K |
| 2026-05-06 | Xiao Deming | EVP, Global Operations | Sell | 3K | $1648.38 | $5.5M | 233K |
| 2026-05-06 | Wynne Eileen | Director | Sell | 335 | $1582.68 | $530K | 1K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 514 | $1600.14 | $822K | 5K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 3K | $1596.42 | $4.2M | 6K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 1K | $1591.38 | $2.2M | 9K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 3K | $1586.81 | $4.1M | 10K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 2K | $1581.81 | $3.0M | 12K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 834 | $1575.57 | $1.3M | 14K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 1K | $1571.58 | $1.7M | 15K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 814 | $1566.36 | $1.3M | 16K |
| 2026-05-06 | Elmiger Eugen J | Director | Sell | 320 | $1559.88 | $499K | 17K |
| 2026-05-05 | Zhou Jeff | Director | Sell | 500 | $1600.00 | $800K | 5K |
| 2026-05-05 | Zhou Jeff | Director | Sell | 514 | $1574.48 | $809K | 5K |
| 2026-05-05 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 380 | $1583.81 | $602K | 919 |
| 2026-05-04 | Sciammas Maurice | EVP, WW Sales & Marketing | Sell | 30 | $1588.73 | $48K | 1K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 120 | $1321.94 | $159K | 157K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 840 | $1319.25 | $1.1M | 157K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 4K | $1312.82 | $5.6M | 158K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 1K | $1308.30 | $1.7M | 162K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 800 | $1302.52 | $1.0M | 163K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 400 | $1292.08 | $517K | 164K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 120 | $1287.12 | $154K | 165K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 240 | $1279.55 | $307K | 165K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 360 | $1270.29 | $457K | 165K |
| 2026-04-08 | Tseng Saria | EVP & General Counsel | Sell | 560 | $1266.48 | $709K | 165K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON50 Form 144 notices on file for MPWR worth $635.3M at the prices reported; 5 in the last 90 days worth $40.7M. Latest: MICHAEL HSING filed on 2026-09-28 to sell 30,000 shares ($40.3M) from 2026-09-28.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-28 | MICHAEL HSINGOfficer, Director | 30K | $40.3M | 0.061% | 2026-09-28 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-24 | DEAN ROBERT W IIOfficer | 32 | $42K | 0.000% | 2026-08-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-17 | DEAN ROBERT W IIOfficer | 6 | $8K | 0.000% | 2026-08-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-11 | Kuo Wei ChangDirector | 100 | $142K | 0.000% | 2026-08-11 | UBS Financial Services Inc |
| 2026-08-05 | ROBERT DEANOfficer | 105 | $141K | 0.000% | 2026-08-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-15 | MAURICE SCIAMMASOfficer | 15K | $20.2M | 0.031% | 2026-07-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-01 | THEODORE BERNHARD BLEGENOfficer | 3K | $4.6M | 0.006% | 2026-06-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-28 | SARIA TSENGOfficer | 8K | $12.9M | 0.015% | 2026-05-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | JEFF ZHOUDirector | 486 | $816K | 0.001% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | DEAN ROBERT W IIOfficer | 22 | $36K | 0.000% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-22 | SARIA TSENGOfficer | 5K | $7.9M | 0.010% | 2026-05-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-18 | MICHAEL HSINGOfficer, Director | 40K | $59.3M | 0.081% | 2026-05-18 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-18 | DEAN ROBERT W IIOfficer | 4 | $6K | 0.000% | 2026-05-18 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-15 | MAURICE SCIAMMASOfficer | 12K | $18.7M | 0.024% | 2026-05-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-06 | DEMING XIAOOfficer | 30K | $49.6M | 0.061% | 2026-05-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-06 | JEFF ZHOUDirector | 500 | $825K | 0.001% | 2026-05-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-06 | EILEEN WYNNEDirector | 335 | $530K | 0.001% | 2026-05-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-06 | Elmiger Eugen JDirector | 12K | $19.8M | 0.024% | 2026-05-07 | Luzerner Kantonalbank AG |
| 2026-05-05 | Rosalind SciammasMember of immediate family of any of the foregoing | 400 | $600K | 0.001% | 2026-05-05 | UBS Financial Services Inc |
| 2026-05-05 | JEFF ZHOUDirector | 1K | $1.6M | 0.002% | 2026-05-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-01 | THEODORE BERNHARD BLEGENOfficer | 3K | $4.6M | 0.006% | 2026-05-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-08 | SARIA TSENGOfficer | 9K | $11.7M | 0.018% | 2026-04-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-06 | SARIA TSENGOfficer | 8K | $8.9M | 0.016% | 2026-04-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-01 | SARIA TSENGOfficer | 1K | $1.6M | 0.003% | 2026-04-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-01 | THEODORE BERNHARD BLEGENOfficer | 3K | $3.3M | 0.006% | 2026-04-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-30 | SARIA TSENGOfficer | 26K | $25.9M | 0.052% | 2026-03-30 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-20 | Sciammas MauriceOfficer | 120 | $131K | 0.000% | 2026-03-20 | UBS Financial Services, Inc. |
| 2026-03-02 | THEODORE BERNHARD BLEGENOfficer | 3K | $3.3M | 0.006% | 2026-03-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-12 | MICHAEL HSINGOfficer, Director | 33K | $38.7M | 0.069% | 2026-02-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-11 | MICHAEL HSINGOfficer, Director | 33K | $39.2M | 0.069% | 2026-02-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-10 | The Sciammas Trust DTD 06/08/2018Member of immediate family of any of the foregoing | 200 | $240K | 0.000% | 2026-02-10 | UBS Financial Services Inc |
| 2026-02-10 | MICHAEL HSINGOfficer, Director | 34K | $38.8M | 0.071% | 2026-02-10 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | Sciammas MauriceOfficer | 1K | $1.5M | 0.003% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | Tseng SariaOfficer | 1K | $1.5M | 0.003% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | Xiao DemingOfficer | 1K | $1.5M | 0.003% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | Hsing MichaelOfficer, Director | 3K | $3.6M | 0.006% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | BLEGEN THEODOREOfficer | 995 | $1.2M | 0.002% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-04 | Sciammas MauriceOfficer | 22K | $25.1M | 0.044% | 2026-02-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-04 | Tseng SariaOfficer | 22K | $25.1M | 0.044% | 2026-02-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-04 | Xiao DemingOfficer | 22K | $25.1M | 0.044% | 2026-02-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-04 | Hsing MichaelOfficer, Director | 52K | $60.4M | 0.106% | 2026-02-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-04 | BLEGEN THEODOREOfficer | 21K | $24.1M | 0.043% | 2026-02-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-02 | THEODORE BERNHARD BLEGENOfficer | 3K | $3.4M | 0.006% | 2026-02-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-02 | THEODORE BERNHARD BLEGENOfficer | 3K | $2.8M | 0.006% | 2026-01-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-29 | VICTOR LEEDirector | 2K | $1.9M | 0.004% | 2025-12-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-01 | BERNIE BLEGENOfficer | 3K | $2.7M | 0.006% | 2025-12-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-26 | SARIA TSENGOfficer | 20K | $18.5M | 0.042% | 2025-11-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-25 | SARIA TSENGOfficer | 20K | $18.1M | 0.042% | 2025-11-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-24 | MAURICE SCIAMMASOfficer | 4K | $3.6M | 0.008% | 2025-11-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-21 | Kuo Wei ChangDirector | 200 | $169K | 0.000% | 2025-11-21 | UBS Financial Services Inc |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON5 holders report 5% or more of MPWR in their latest filing, all on Schedule 13G (passive). The largest reported stake is Abigail P. Johnson at 10.5% of the class (5,175,259 shares), filed 2026-07-08 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-08 | 13G/Ano. 3 | Abigail P. Johnsonindividual | 5.2M | 10.5% | 2026-06-30 |
| 2026-07-08 | 13G/Ano. 3 | FMR LLCparent holding company | 5.2M | 10.5% | 2026-06-30 |
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 3.6M | 7.3% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 2.5M | 5.1% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 15 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-01-08 | 13G/Ano. 4 | BlackRock, Inc.parent holding company | 4.9M | 10.2% | 2025-12-31 |
13F holders
Tracked managers holding MPWR at their latest 13F. JSON8 of the 30 tracked managers held MPWR at their latest 13F, $670.0M in total at quarter-end prices. Two Sigma Investments is the largest at $263.3M (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Two Sigma Investments | 2026-06-30 | 191K | $263.3M | 0.19% | +178K |
| Millennium Management | 2026-06-30 | 137K | $189.2M | 0.07% | new |
| Citadel Advisors | 2026-06-30 | 63K | $87.8M | 0.01% | +50K |
| Renaissance Technologies | 2026-06-30 | 63K | $87.2M | 0.12% | new |
| AQR Capital Management | 2026-06-30 | 25K | $33.8M | 0.01% | -13K |
| Bridgewater Associates | 2026-06-30 | 3K | $4.3M | 0.02% | -9K |
| D. E. Shaw & Co. | 2026-06-30 | 3K | $4.2M | 0.00% | +2K |
| Fisher Asset Management | 2026-06-30 | 177 | $246K | 0.00% | -35 |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Monolithic Power Systems reported revenue of $980.6M, up 47.6% from the same quarter a year earlier, and net income of $257.3M (5.22 diluted EPS). In FY 2025 it generated $838.2M of operating cash flow and spent $6.6M on buybacks and $284.8M on dividends.
- Cash
- $1.01B
- Equity
- $3.90B
- Total assets
- $4.69B
- Shares outstanding
- 49,143,000
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $980.6M | $257.3M | 26.2% | 5.22 |
| Q1 FY 2026 | 2026-03-31 | $804.2M | $193.2M | 24.0% | 3.92 |
| Q4 FY 2025derived | 2025-12-31 | $751.2M | $171.7M | 22.9% | n/a |
| Q3 FY 2025 | 2025-09-30 | $737.2M | $179.8M | 24.4% | 3.74 |
| Q2 FY 2025 | 2025-06-30 | $664.6M | $135.0M | 20.3% | 2.81 |
| Q1 FY 2025 | 2025-03-31 | $637.6M | $135.1M | 21.2% | 2.81 |
| Q4 FY 2024derived | 2024-12-31 | $621.7M | $1.25B | 201.8% | n/a |
| Q3 FY 2024 | 2024-09-30 | $620.1M | $144.4M | 23.3% | 2.95 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $2.79B | $621.5M | $838.2M | $172.0M | $6.6M | $284.8M |
| FY 2024 | 2024-12-31 | $2.21B | $1.59B | $788.4M | $146.1M | $636.2M | $240.6M |
| FY 2023 | 2023-12-31 | $1.82B | $427.4M | $638.2M | $57.6M | $3.7M | $185.8M |
| FY 2022 | 2022-12-31 | $1.79B | $437.7M | $246.7M | $58.8M | $0 | $138.0M |
| FY 2021 | 2021-12-31 | $1.21B | $242.0M | $320.0M | $94.4M | $0 | $109.4M |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-29 from the cover page.
What this page is
Monolithic Power Systems in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Monolithic Power Systems (MPWR), SEC CIK 1280452, listed on Nasdaq, classified by the SEC as semiconductors & related devices. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-28.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-21.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-09-28.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-07-08.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-30.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-28.JSON and CSV
- Company record
- EDGAR filing index for CIK 1280452Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
Other companies the SEC classifies as semiconductors & related devices
Other company pages
Datasets
Frequently Asked Questions
How much of MPWR is sold short?
1,602,872 shares were held short at the 2026-10-15 settlement, 2.3 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is MPWR's daily short volume?
On 2026-10-28, 62,351 of the 193,570 MPWR shares reported to FINRA were sold short, 32.2% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MPWR have fails to deliver?
The SEC's latest file shows 40 MPWR shares failed to deliver at settlement 2026-09-21. Fails are reported per settlement date and published twice a month with a lag.
Are MPWR insiders buying or selling?
Insiders at MPWR reported 14 open-market sells worth $40.7M in the last 90 days and no open-market buys. Latest filing: Hsing Michael (CEO) on 2026-09-28.
Have MPWR insiders filed to sell?
50 Form 144 notices on file for MPWR worth $635.3M at the prices reported; 5 in the last 90 days worth $40.7M. Latest: MICHAEL HSING filed on 2026-09-28 to sell 30,000 shares ($40.3M) from 2026-09-28.
Who owns 5% or more of MPWR?
5 holders report 5% or more of MPWR in their latest filing, all on Schedule 13G (passive). The largest reported stake is Abigail P. Johnson at 10.5% of the class (5,175,259 shares), filed 2026-07-08 for an event on 2026-06-30.
What did MPWR report last quarter?
In Q2 FY 2026 (quarter ended 2026-06-30) Monolithic Power Systems reported revenue of $980.6M, up 47.6% from the same quarter a year earlier, and net income of $257.3M (5.22 diluted EPS). In FY 2025 it generated $838.2M of operating cash flow and spent $6.6M on buybacks and $284.8M on dividends.
Which tracked 13F managers own MPWR?
8 of the 30 tracked 13F managers held MPWR shares at their latest filing, $670.0M in all. The largest: Two Sigma Investments (191K shares, $263.3M), Izzy Englander's Millennium Management (137K shares, $189.2M), Ken Griffin's Citadel Advisors (63K shares, $87.8M), Renaissance Technologies (63K shares, $87.2M), Cliff Asness's AQR Capital Management (25K shares, $33.8M), Ray Dalio's Bridgewater Associates (3K shares, $4.3M). The table above lists all 8.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.