MPWR Monolithic Power Systems, Inc.
Monolithic Power Systems, Inc. (MPWR) Institutional Ownership
What the institutions did with MPWR last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended September 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| FMR LLC | 4.5M | 35.3% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2M | 9.7% |
| BARCLAYS PLC | 399.2K | 3.2% |
| UBS Group AG | 349.8K | 2.8% |
| VOYA INVESTMENT MANAGEMENT LLC | 309.0K | 2.4% |
| Bank of New York Mellon Corp | 289.8K | 2.3% |
| Amundi | 256.1K | 2.0% |
| FIL Ltd | 253.2K | 2.0% |
| DEUTSCHE BANK AG\ | 187.8K | 1.5% |
| CITIGROUP INC | 183.9K | 1.5% |
| PRINCIPAL FINANCIAL GROUP INC | 165.4K | 1.3% |
| NATIXIS | 149.7K | 1.2% |
| SEI INVESTMENTS CO | 144.8K | 1.1% |
| Mitsubishi UFJ Asset Management Co., Ltd. | 140.1K | 1.1% |
| WT Asset Management Ltd | 137.8K | 1.1% |
| DIMENSIONAL FUND ADVISORS LP | 133.5K | 1.1% |
| Nuveen, LLC | 117.6K | 0.9% |
| Mirae Asset Global Investments Co., Ltd. | 111.1K | 0.9% |
| Sumitomo Mitsui Trust Group, Inc. | 107.4K | 0.9% |
| Pictet Asset Management Holding SA | 96.9K | 0.8% |
| RHUMBLINE ADVISERS | 93.2K | 0.7% |
| TimesSquare Capital Management, LLC | 90.7K | 0.7% |
| Robeco Schweiz AG | 89.0K | 0.7% |
| Thrivent Financial for Lutherans | 87.0K | 0.7% |
| VICTORY CAPITAL MANAGEMENT INC | 83.9K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Reduced | 5.2M | 4.5M | -725.1K |
| DekaBank Deutsche Girozentrale | Reduced | 190.4K | 44.3K | -146.2K |
| CITIGROUP INC | Reduced | 325.3K | 183.9K | -141.4K |
| WT Asset Management Ltd | New | 0 | 137.8K | +137.8K |
| NATIXIS | Increased | 13.2K | 149.7K | +136.5K |
| Amundi | Increased | 145.7K | 256.1K | +110.4K |
| UBS Group AG | Reduced | 449.5K | 349.8K | -99.7K |
| BARCLAYS PLC | Reduced | 474.1K | 399.2K | -75.0K |
| ING GROEP NV | Increased | 12.0K | 49.7K | +37.7K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 5.9K | 40.9K | +34.9K |
| Retirement Systems of Alabama | Increased | 10.3K | 43.0K | +32.7K |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | 340.3K | 309.0K | -31.2K |
| FIL Ltd | Increased | 224.6K | 253.2K | +28.6K |
| MIZUHO MARKETS AMERICAS LLC | Reduced | 26.4K | 199 | -26.2K |
| Pembroke Management, LTD | Reduced | 53.1K | 29.5K | -23.7K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.2M | 1.2M | +23.1K |
| Squarepoint Ops LLC | Reduced | 53.0K | 30.7K | -22.3K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 154.4K | 133.5K | -20.9K |
| DEUTSCHE BANK AG\ | Increased | 167.3K | 187.8K | +20.5K |
| TimesSquare Capital Management, LLC | Reduced | 110.8K | 90.7K | -20.2K |
| Vest Financial, LLC | Reduced | 35.1K | 17.9K | -17.2K |
| SAPIENT CAPITAL LLC | Reduced | 22.0K | 6.5K | -15.5K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 37.8K | 53.1K | +15.3K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 180.2K | 165.4K | -14.8K |
| Achmea Investment Management B.V. | New | 0 | 14.0K | +14.0K |
| Mirae Asset Global Investments Co., Ltd. | Increased | 97.6K | 111.1K | +13.5K |
| EULAV Asset Management | Reduced | 32.7K | 19.3K | -13.3K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Reduced | 15.8K | 2.6K | -13.1K |
| Swiss Life Asset Management Ltd | Reduced | 24.1K | 11.0K | -13.1K |
| Y-Intercept (Hong Kong) Ltd | Reduced | 18.1K | 5.2K | -12.9K |
| NORDEA INVESTMENT MANAGEMENT AB | Reduced | 25.3K | 13.1K | -12.2K |
| NICHOLAS COMPANY, INC. | New | 0 | 11.9K | +11.9K |
| Nuveen, LLC | Reduced | 129.3K | 117.6K | -11.7K |
| VICTORY CAPITAL MANAGEMENT INC | Reduced | 94.5K | 83.9K | -10.6K |
| USS Investment Management Ltd | Reduced | 22.2K | 11.8K | -10.3K |
| Fideuram Asset Management (Ireland) dac | Reduced | 19.8K | 9.6K | -10.2K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | Increased | 53.0K | 63.1K | +10.1K |
| BANK OF MONTREAL /CAN/ | Reduced | 46.7K | 37.4K | -9.3K |
| Mitsubishi UFJ Asset Management Co., Ltd. | Increased | 132.1K | 140.1K | +8.0K |
| Allspring Global Investments Holdings, LLC | Reduced | 84.3K | 76.6K | -7.7K |
| COMMONWEALTH EQUITY SERVICES, LLC | Increased | 4.5K | 11.8K | +7.3K |
| Robeco Schweiz AG | Reduced | 96.0K | 89.0K | -7.0K |
| AustralianSuper Pty Ltd | Reduced | 8.7K | 1.8K | -6.9K |
| Krane Funds Advisors LLC | New | 0 | 6.9K | +6.9K |
| Aberdeen Group plc | Reduced | 41.9K | 35.3K | -6.5K |
| Cambridge Investment Research Advisors, Inc. | Reduced | 10.1K | 3.6K | -6.5K |
| PREVAIL INNOVATIVE WEALTH ADVISORS, LLC | Sold Out | 6.4K | 0 | -6.4K |
| OP Asset Management Ltd | Reduced | 14.3K | 8.1K | -6.1K |
| Public Sector Pension Investment Board | Reduced | 15.1K | 9.0K | -6.1K |
| CONGRESS ASSET MANAGEMENT CO | Reduced | 80.4K | 74.4K | -6.0K |
| IMC-Chicago, LLC | Reduced | 9.7K | 3.7K | -6.0K |
| Aware Super Pty Ltd as trustee of Aware Super | Sold Out | 6.0K | 0 | -6.0K |
| PARK NATIONAL CORP /OH/ | Reduced | 21.7K | 16.1K | -5.6K |
| Counterpoint Mutual Funds LLC | Sold Out | 5.5K | 0 | -5.5K |
| WASATCH ADVISORS LP | Increased | 1.2K | 6.5K | +5.3K |
| NEOS Investment Management LLC | Increased | 37.1K | 42.0K | +4.9K |
| PFA Pension, Forsikringsaktieselskab | Reduced | 33.7K | 28.9K | -4.9K |
| Titan Investment Solutions Ltd | Sold Out | 4.9K | 0 | -4.9K |
| Vontobel Holding Ltd. | Reduced | 23.9K | 19.5K | -4.4K |
| ZEVENBERGEN CAPITAL INVESTMENTS LLC | Reduced | 78.6K | 74.7K | -3.9K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.