Kalaris Therapeutics, Inc.

KLRS

Exchange: Nasdaq
Industry: Biological Products, (No Diagnostic Substances)
SEC CIK: 0001754068

SEC filings (opens in a new tab)

No open-market purchases or sales by Kalaris Therapeutics, Inc. insiders were filed in the last 90 days; 56 institutions reported holding it in 13F filings for Q2 2026, worth $73.4M in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Kalaris Therapeutics, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of KLRS: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Q4 2025	Change
Holders	32	51	+19
Shares	13.2M	18.0M	+4.77M (+36.1%)
Value	$76.4M	$151.9M	+$75.5M (+98.7%)

New holders (24)

Institutions that held Kalaris Therapeutics, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to KLRS in Q4 2025
Institution	Shares	Value	% of portfolio
RTW Investments, LP	1,300,000	$11.0M	0.11%
Paradigm Biocapital Advisors LP	700,000	$5.91M	0.16%
Alyeska Investment Group, L.P.	403,551	$3.40M	0.01%
Ikarian Capital, LLC	360,000	$3.04M	0.39%
Kalehua Capital Management LLC	139,901	$1.18M	1.17%
ADAR1 Capital Management, LLC	100,000	$844.0K	0.06%
Whi Trust Co LLC	97,493	$822.8K	0.63%
Boothbay Fund Management, LLC	92,261	$778.7K	0.02%
Raymond James Financial Inc	88,436	$746.4K	0.00%
683 Capital Management, LLC	80,590	$680.2K	0.06%
Propel Bio Management, LLC	42,053	$354.9K	0.30%
Jane Street Group, LLC	33,114	$279.5K	0.00%
Omers Administration Corp	30,000	$253.2K	0.00%
Two Sigma Investments, LP	27,759	$234.3K	0.00%
Simplify Asset Management Inc.	20,074	$169.4K	0.00%
Northern Trust Corp	13,654	$115.2K	0.00%
Susquehanna International Group, LLP	12,856	$108.5K	0.00%
Walleye Capital LLC	11,225	$94.7K	0.00%
XTX Topco Ltd	10,897	$92.0K	0.00%
Keel Point, LLC	10,225	$86.3K	0.01%
Connor, Clark & Lunn Investment Management Ltd.	10,159	$85.7K	0.00%
Barclays PLC	6,065	$51.2K	0.00%
Nano Cap New Millennium Growth Fund L P	4,000	$33.8K	0.03%
Fortitude Family Office, LLC	114	$962	0.00%

Sold out (5)

Institutions that held Kalaris Therapeutics, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of KLRS in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Tang Capital Management LLC	418,241	$2.42M
Millennium Management LLC	24,923	$144.1K
Federated Hermes, Inc.	578	$3.34K
Strengthening Families & Communities, LLC	268	$1.55K
Farther Finance Advisors, LLC	33	$191