MONOLITHIC POWER SYSTEMS INC (MPWR) Stock Institutional Trading Activity
MONOLITHIC POWER SYSTEMS INC (MPWR) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Torray Fund, Parnassus Endeavor Fund, Sequoia Financial Advisors, and Matrix Private Capital Group. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- MONOLITHIC POWER SYSTEMS INC (MPWR) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q3 2023 | Renaissance Technologies LLC | Buy | 74,400 | 188,386 | $87,034 |
| Q3 2023 | Polen Capital Management | Buy | 25 | 2,489 | $1,149,918 |
| Q2 2023 | Torray Fund | Buy | 20 | 3,236 | $1,748,184 |
| Q2 2023 | Renaissance Technologies LLC | Sell | -80,400 | 113,986 | $61,579 |
| Q2 2023 | Polen Capital Management | Buy | 1,148 | 2,464 | $1,331,127 |
| Q1 2023 | Torray Fund | Buy | 7 | 3,216 | $1,609,737 |
| Q1 2023 | Renaissance Technologies LLC | Buy | 102,200 | 194,386 | $97,298 |
| Q1 2023 | Polen Capital Management | Sell | -2,587 | 1,316 | $658,711 |
| Q1 2023 | Parnassus Endeavor Fund | Sell | -11,132 | 28,318 | $14,174,292 |
| Q4 2022 | Torray Fund | Sell | -86 | 3,209 | $1,134,734 |
| Q4 2022 | Renaissance Technologies LLC | Sell | -331,155 | 92,186 | $32,598 |
| Q4 2022 | Parnassus Endeavor Fund | Buy | 23,294 | 39,450 | $13,949,915 |
| Q3 2022 | Torray Fund | Sell | -77 | 3,295 | $1,197 |
| Q3 2022 | Parnassus Endeavor Fund | Sell | -34,106 | 16,156 | $5,871 |
| Q3 2022 | Renaissance Technologies LLC | Buy | 327,755 | 423,341 | $153,842 |
| Q2 2022 | Torray Fund | Buy | 8 | 3,372 | $1,295 |
| Q2 2022 | Renaissance Technologies LLC | Sell | -57,940 | 95,586 | $36,709 |
| Q1 2022 | Torray Fund | Buy | 116 | 3,364 | $1,634 |
| Q1 2022 | Renaissance Technologies LLC | Sell | -27,660 | 153,526 | $74,565 |
| Q4 2021 | Torray Fund | Sell | -1,396 | 3,248 | $1,602 |
| Q4 2021 | Renaissance Technologies LLC | Buy | 100,879 | 181,186 | $89,384 |
| Q3 2021 | Torray Fund | Buy | 18 | 4,644 | $2,251 |
| Q3 2021 | Matrix Private Capital Group | Buy | 414 | 414 | $201 |
| Q3 2021 | Renaissance Technologies LLC | Sell | -22,479 | 80,307 | $38,923 |
| Q2 2021 | Torray Fund | Buy | 35 | 4,626 | $1,728 |
| Q2 2021 | Renaissance Technologies LLC | Sell | -61,500 | 102,786 | $38,385 |
| Q1 2021 | Torray Fund | Buy | 58 | 4,591 | $1,622 |
| Q4 2020 | Torray Fund | Sell | -648 | 4,533 | $1,660 |
| Q3 2020 | Torray Fund | Sell | -1,408 | 5,181 | $1,449 |
| Q3 2020 | Parnassus Endeavor Fund | Sell | -1,152 | 50,262 | $14,054 |
Frequently asked questions about MPWR activity
Which institutional owners are buying MPWR?
Institutional owners buying MPWR include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in MPWR activity?
"Buy" means an investor increased their reported position in MPWR compared to the prior reporting period. This reflects growing exposure to MONOLITHIC POWER SYSTEMS INC (MPWR) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in MPWR increasing?
Institutional interest in MPWR can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.