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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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2020Renaissance Technologies LLCBuy47,500164,286$45,936
Q2 2020Torray FundSell-1,0526,589$1,562
Q2 2020Parnassus Endeavor FundSell-61,41351,414$12,185
Q2 2020Renaissance Technologies LLCBuy90,300116,786$27,678
Q1 2020Torray FundBuy3087,641$1,280
Q1 2020Renaissance Technologies LLCBuy22,90026,486$4,435
Q4 2019Torray FundBuy6887,333$1,305
Q3 2019Renaissance Technologies LLCSell-65,5003,586$558
Q2 2019Torray FundSell-586,645$902
Q2 2019Parnassus Endeavor FundBuy112,827112,827$15,320
Q2 2019Renaissance Technologies LLCBuy51,44469,086$9,380
Q1 2019Torray FundBuy1726,703$908
Q4 2018Torray FundBuy6,5316,531$759
Q4 2018Renaissance Technologies LLCBuy14,05617,642$2,051
Q3 2018Polen Capital ManagementBuy3253,903$490
Q2 2018Polen Capital ManagementBuy3873,578$478
Q1 2018Polen Capital ManagementBuy9453,191$370
Q1 2018Renaissance Technologies LLCSell-4143,586$415
Q4 2017Polen Capital ManagementBuy2,2462,246$252
Q2 2017Renaissance Technologies LLCSell-3004,000$386
Q1 2017Renaissance Technologies LLCSell-52,8004,300$396
Q4 2016Renaissance Technologies LLCSell-114,20057,100$4,678
Q3 2016Renaissance Technologies LLCSell-177,586171,300$13,790
Q2 2016Renaissance Technologies LLCSell-344,400348,886$23,836
Q1 2016Renaissance Technologies LLCBuy252,200693,286$44,121
Q4 2015Renaissance Technologies LLCSell-8,314441,086$28,102
Q3 2015Renaissance Technologies LLCSell-3,100449,400$23,009
Q2 2015Renaissance Technologies LLCBuy2,514452,500$22,946
Q1 2015Renaissance Technologies LLCBuy16,900449,986$23,692
Q4 2014Renaissance Technologies LLCBuy30,100433,086$21,542

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.