Monolithic Power Systems MPWR
$1,190.44 +$59.01 (+5.22%)
Market closed · Nov 6, 8:20 pm ET · Last extended-hours $1,190.00 -0.04%
Open$1,201.30
Prev close$1,131.43
Day range$1,153.34 – $1,217.24
Volume1.20M
Market cap$58.06B
P/E (TTM)65.6
Dividend yield0.64%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership98.8%-0.21 pts vs. prior quarter
Institutions holding1,541+10 vs. prior quarter
Insider trades (recent)4 buys / 44 sellsNet selling
Short interest3.26% of floatDays to cover 2.3 · as of 15 Oct 2026
Short-sale volume share8.5%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$27.81M (12 inflow days, 8 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 38.3% of shares outstanding.
Largest holders
By investor type
Reported short interest has fallen from 4.32% to 3.26% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| FMR | Mutual Fund | 2026/Q3 | +767,339 | 10.0% |
| Van Eck Associates Corporation | Mutual Fund | 2026/Q3 | +221,666 | 1.5% |
| Millennium Management LLC | Hedge Fund | 2026/Q3 | +183,976 | 0.4% |
| Two Sigma Investments, LP | Hedge Fund | 2026/Q3 | +178,487 | 0.4% |
| The Goldman Sachs Group, Inc. | Public Company | 2026/Q3 | +175,689 | 1.0% |
| Jane Street Group, LLC | Private Company | 2026/Q3 | +174,210 | 0.4% |
| Bank of America Corporation | Public Company | 2026/Q3 | +168,380 | 0.8% |
| Rafferty Asset Management, LLC | Mutual Fund | 2026/Q3 | +141,805 | 0.9% |
| Jennison Associates LLC | Mutual Fund | 2026/Q3 | +136,108 | 0.4% |
| Federated Hermes, Inc. | Mutual Fund | 2026/Q3 | +96,834 | 0.3% |
| Susquehanna International Group, LLP | Private Company | 2026/Q3 | +95,717 | 0.3% |
| Canada Pension Plan Investment Board | Government Pension Fund | 2026/Q3 | +95,448 | 0.3% |
| State Street Global Advisors | Mutual Fund | 2026/Q3 | +93,732 | 4.6% |
| D1 Capital Partners L.P. | Hedge Fund | 2026/Q3 | +85,103 | 0.2% |
| Morgan Stanley | Public Company | 2026/Q3 | +84,512 | 0.8% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 27 Sep 2026 | Michael Hsing | Chairperson & CEO | Automatic Disposition | -30,000 | $1,356.94 | 964,129 |
| 30 Aug 2026 | Saria Tseng | EVP of Strategic Corporate Development, General Counsel & Corporate Secretary | Other Acquisition | +2,000 | – | 145,218 |
| 30 Aug 2026 | Saria Tseng | EVP of Strategic Corporate Development, General Counsel & Corporate Secretary | Other Disposition | -2,000 | – | 145,218 |
| 23 Aug 2026 | Kuo Wei Chang | Lead Independent Director | Open Market Disposition | -50 | $1,281.57 | 326 |
| 23 Aug 2026 | Robert Dean | Vice President | Other Disposition | -5 | – | 4,505 |
| 23 Aug 2026 | Robert Dean | Vice President | Open Market Disposition | -32 | $1,297.72 | 4,505 |
| 16 Aug 2026 | Robert Dean | Vice President | Open Market Disposition | -6 | $1,413.64 | 4,493 |
| 10 Aug 2026 | Kuo Wei Chang | Lead Independent Director | Open Market Disposition | -50 | $1,420.00 | 376 |
| 4 Aug 2026 | Robert Dean | Vice President | Open Market Disposition | -105 | $1,344.27 | 4,488 |
| 3 Aug 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Other Acquisition | +25,000 | – | 234,442 |
| 3 Aug 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Other Disposition | -25,000 | – | 234,442 |
| 2 Aug 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Automatic Disposition | -30 | $1,343.94 | 234,442 |
| 24 Jul 2026 | Robert Dean | Vice President | Other Acquisition | +1,359 | – | 2,709 |
| 14 Jul 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Automatic Disposition | -15,000 | $1,405.71 | 234,472 |
| 30 Jun 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Automatic Disposition | -30 | $1,351.61 | 249,472 |
| 31 May 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Automatic Disposition | -30 | $1,533.95 | 249,502 |
| 28 May 2026 | Maurice Sciammas | Executive Vice President of Worldwide Sales & Marketing | Other Disposition | -12,472 | – | 249,532 |
| 26 May 2026 | Saria Tseng | EVP of Strategic Corporate Development, General Counsel & Corporate Secretary | Open Market Disposition | -7,565 | $1,700.00 | 145,218 |
| 25 May 2026 | Jeff Zhou | Independent Director | Open Market Disposition | -486 | $1,680.00 | 3,611 |
| 25 May 2026 | Robert Dean | Vice President | Open Market Disposition | -22 | $1,649.56 | 4,593 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 1,602,872 | 3.3% | 2.3 |
| 30 Sep 2026 | 1,858,921 | 3.8% | 2.3 |
| 15 Sep 2026 | 1,906,839 | 3.9% | 3.1 |
| 31 Aug 2026 | 1,998,007 | 4.1% | 3.3 |
| 14 Aug 2026 | 1,839,078 | 3.7% | 2.7 |
| 31 Jul 2026 | 2,122,311 | 4.3% | 2.1 |
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