KALARIS THERAPEUTICS INC (KLRS) Institutional Ownership Changes & 13F Activity

KALARIS THERAPEUTICS INC (KLRS). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q4 2025). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Samsara Biocapital, Llc, Rtw Investments, Lp, Paradigm Biocapital Advisors Lp, Siren, L.L.C., and Alyeska Investment Group, L.P..

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Ikarian Capital, LlcBuy+360,000—360,000$3.04MQ4 2025Feb 18, 2026
Raymond James Financial IncBuy+88,436—88,436$746.40KQ4 2025Feb 18, 2026
Samsara Biocapital, LlcBuy+12,948,081—12,948,081$109.28MQ4 2025Feb 17, 2026
Rtw Investments, LpBuy+1,300,000—1,300,000$10.97MQ4 2025Feb 17, 2026
Paradigm Biocapital Advisors LpBuy+700,000—700,000$5.91MQ4 2025Feb 17, 2026
Adar1 Capital Management, LlcBuy+100,000—100,000$844.00KQ4 2025Feb 17, 2026
Woodline Partners LpBuy+100,000—100,000$844.00KQ4 2025Feb 17, 2026
Boothbay Fund Management, LlcBuy+92,261—92,261$778.68KQ4 2025Feb 17, 2026
Redmile Group, LlcBuy+82,955—82,955$700.14KQ4 2025Feb 17, 2026
683 Capital Management, LlcBuy+80,590—80,590$680.18KQ4 2025Feb 17, 2026
Two Sigma Investments, LpBuy+27,759—27,759$234.29KQ4 2025Feb 17, 2026
Bridgeway Capital Management, LlcBuy+22,500—22,500$189.90KQ4 2025Feb 17, 2026
Rbf Capital, LlcBuy+17,391—17,391$146.78KQ4 2025Feb 17, 2026
Northern Trust CorpBuy+13,654—13,654$115.24KQ4 2025Feb 17, 2026
Susquehanna International Group, LlpBuy+12,856—12,856$108.50KQ4 2025Feb 17, 2026
Xtx Topco LtdBuy+10,897—10,897$91.97KQ4 2025Feb 17, 2026
Fmr LlcBuy+7,806—7,806$65.88KQ4 2025Feb 17, 2026
Bank Of America CorpBuy+6,704—6,704$56.58KQ4 2025Feb 17, 2026
Royal Bank Of CanadaBuy+113—113$1.00KQ4 2025Feb 17, 2026
Siren, L.L.C.Buy+435,798—435,798$3.68MQ4 2025Feb 13, 2026
Alyeska Investment Group, L.P.Buy+403,551—403,551$3.40MQ4 2025Feb 13, 2026
Kalehua Capital Management LlcBuy+139,901—139,901$1.18MQ4 2025Feb 13, 2026
Marshall Wace, LlpBuy+72,876—72,876$615.07KQ4 2025Feb 13, 2026
Omers Administration CorpBuy+30,000—30,000$253.20KQ4 2025Feb 13, 2026
Morgan StanleyBuy+27,948—27,948$235.88KQ4 2025Feb 13, 2026
State Street CorpBuy+25,410—25,410$214.46KQ4 2025Feb 13, 2026
Squarepoint Ops LlcBuy+25,367—25,367$214.10KQ4 2025Feb 13, 2026
Walleye Capital LlcBuy+11,225—11,225$94.74KQ4 2025Feb 13, 2026
Barclays PlcBuy+6,065—6,065$51.19KQ4 2025Feb 13, 2026
Citigroup IncBuy+1—1$8.00Q4 2025Feb 13, 2026
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Frequently asked questions about KLRS activity

  • Which institutional owners are buying KLRS?

    Institutional owners buying KLRS 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 KLRS activity?

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

  • Is institutional interest in KLRS increasing?

    Institutional interest in KLRS 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.