CYTOSORBENTS CORP (CTSO) Institutional Ownership Changes & 13F Activity

CYTOSORBENTS CORP (CTSO) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCBuy600100,720$57,038
Q4 2025Renaissance Technologies LLCSell-34,685100,120$63,997
Q3 2025Renaissance Technologies LLCBuy18,166134,805$125,921
Q2 2025Renaissance Technologies LLCSell-108,615116,639$149,298
Q1 2025Renaissance Technologies LLCBuy137,234225,254$225,254
Q4 2024Renaissance Technologies LLCBuy8,40088,020$80,098
Q3 2024Renaissance Technologies LLCBuy3,80079,620$119,430
Q2 2024Renaissance Technologies LLCSell-3,80075,820$53,301
Q1 2024Renaissance Technologies LLCSell-95,70079,620$76
Q4 2023Renaissance Technologies LLCBuy56,220175,320$195
Q3 2023Renaissance Technologies LLCBuy200119,100$224
Q2 2023Renaissance Technologies LLCBuy300118,900$427
Q1 2023Renaissance Technologies LLCBuy200118,600$400
Q4 2022Renaissance Technologies LLCSell-79,396118,400$184
Q3 2022Renaissance Technologies LLCBuy57,676197,796$269
Q2 2022Renaissance Technologies LLCBuy55,220140,120$307
Q1 2022Renaissance Technologies LLCSell-55,20084,900$271
Q2 2021Renaissance Technologies LLCSell-39,900140,100$1,058
Q1 2021Renaissance Technologies LLCBuy106,900180,000$1,562
Q4 2020Renaissance Technologies LLCSell-22,90073,100$583
Q3 2020Renaissance Technologies LLCBuy57,20096,000$766
Q1 2019Renaissance Technologies LLCSell-82,90038,800$294
Q4 2018Renaissance Technologies LLCBuy121,700121,700$983

Frequently asked questions about CTSO activity

  • Which institutional owners are buying CTSO?

    Institutional owners buying CTSO 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 CTSO activity?

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

  • Is institutional interest in CTSO increasing?

    Institutional interest in CTSO 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.

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