(TNDM) Stock Institutional Trading Activity


(TNDM) 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. 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 2025Renaissance Technologies LLCSell-180,827161,500$1,960,610
Q2 2025Renaissance Technologies LLCBuy56,200342,327$6,380,975
Q1 2025Renaissance Technologies LLCSell-29,600286,127$5,482,193
Q4 2024Renaissance Technologies LLCBuy105,300315,727$11,372,487
Q3 2024Renaissance Technologies LLCSell-85,396210,427$8,924,209
Q2 2024Renaissance Technologies LLCSell-298,504295,823$11,918,709
Q1 2024Renaissance Technologies LLCBuy576,100594,327$21,045
Q4 2023Renaissance Technologies LLCSell-49,17318,227$539
Q3 2022Renaissance Technologies LLCSell-85,82767,400$3,225
Q2 2022Renaissance Technologies LLCBuy131,327153,227$9,070
Q1 2022Renaissance Technologies LLCSell-2,32721,900$2,547
Q4 2021Renaissance Technologies LLCSell-215,31924,227$3,647
Q3 2021Renaissance Technologies LLCBuy205,119239,546$28,597
Q2 2021Renaissance Technologies LLCSell-136,70034,427$3,353
Q1 2021Renaissance Technologies LLCSell-145,300171,127$15,102
Q4 2020Renaissance Technologies LLCSell-126,669316,427$30,276
Q3 2020Renaissance Technologies LLCSell-392,332443,096$50,291
Q2 2020Renaissance Technologies LLCBuy340,500835,428$82,641
Q1 2020Renaissance Technologies LLCSell-189,972494,928$31,849
Q4 2019Renaissance Technologies LLCSell-608,727684,900$40,827
Q3 2019Renaissance Technologies LLCBuy395,7001,293,627$76,298
Q2 2019Renaissance Technologies LLCBuy123,500897,927$57,934
Q1 2019Renaissance Technologies LLCSell-637,900774,427$49,176
Q4 2018Renaissance Technologies LLCBuy1,016,7331,412,327$53,626
Q3 2018Renaissance Technologies LLCBuy238,367395,594$16,947
Q1 2018Renaissance Technologies LLCBuy130,377157,227$780
Q4 2017Renaissance Technologies LLCBuy26,85026,850$63

Frequently asked questions about TNDM activity

  • Which institutional owners are buying TNDM?

    Institutional owners buying TNDM 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 TNDM activity?

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

  • Is institutional interest in TNDM increasing?

    Institutional interest in TNDM 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.