POWER INTEGRATIONS INC (POWI) Stock Institutional Trading Activity


POWER INTEGRATIONS INC (POWI) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Disciplined Growth Investors and Renaissance Technologies LLC. 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 2021Renaissance Technologies LLCBuy53,200195,900$19,392
Q3 2021Disciplined Growth InvestorsSell-30,7271,790,805$177,272
Q2 2021Renaissance Technologies LLCBuy115,200142,700$11,710
Q2 2021Disciplined Growth InvestorsBuy41,3991,821,532$149,475
Q1 2021Renaissance Technologies LLCSell-4,70027,500$2,241
Q1 2021Disciplined Growth InvestorsSell-471,3291,780,133$145,045
Q4 2020Renaissance Technologies LLCSell-301,90032,200$2,636
Q4 2020Disciplined Growth InvestorsSell-102,9942,251,462$184,305
Q3 2020Renaissance Technologies LLCBuy228,200334,100$18,509
Q3 2020Disciplined Growth InvestorsBuy1,145,8872,354,456$130,437
Q2 2020Renaissance Technologies LLCBuy70,100105,900$12,510
Q2 2020Disciplined Growth InvestorsSell-411,9811,208,569$142,768
Q1 2020Renaissance Technologies LLCSell-13,30035,800$3,162
Q1 2020Disciplined Growth InvestorsSell-90,3491,620,550$143,143
Q4 2019Renaissance Technologies LLCSell-17,10049,100$4,856
Q4 2019Disciplined Growth InvestorsBuy21,8361,710,899$169,225
Q3 2019Disciplined Growth InvestorsBuy10,0451,689,063$152,742
Q2 2019Disciplined Growth InvestorsSell-78,6911,679,018$134,624
Q1 2019Disciplined Growth InvestorsSell-12,5401,757,709$122,934
Q4 2018Disciplined Growth InvestorsBuy50,7771,770,249$107,950
Q3 2018Renaissance Technologies LLCSell-192,60066,200$4,184
Q3 2018Disciplined Growth InvestorsBuy60,8821,719,472$108,671
Q2 2018Disciplined Growth InvestorsBuy271,9501,658,590$121,160
Q1 2018Renaissance Technologies LLCSell-44,500258,800$17,689
Q1 2018Disciplined Growth InvestorsBuy169,1781,386,640$94,777
Q4 2017Renaissance Technologies LLCSell-25,700303,300$22,308
Q4 2017Disciplined Growth InvestorsBuy5,6751,217,462$89,544
Q3 2017Renaissance Technologies LLCSell-96,400329,000$24,083
Q3 2017Disciplined Growth InvestorsSell-22,9001,211,787$88,703
Q2 2017Renaissance Technologies LLCBuy59,200425,400$31,012

Frequently asked questions about POWI activity

  • Which institutional owners are buying POWI?

    Institutional owners buying POWI 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 POWI activity?

    "Buy" means an investor increased their reported position in POWI compared to the prior reporting period. This reflects growing exposure to POWER INTEGRATIONS INC (POWI) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in POWI increasing?

    Institutional interest in POWI 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.