Kalaris Therapeutics KLRS Institutional Ownership

NASDAQ KLRS

$2.02 -0.05 (-2.42%)

At close: Oct 21, 2026 · 4:00 PM EDT

Institutions by Trading Activity

57 Institutions

Increased 28 49.1%

Unchanged 20 35.1%

Reduced 9 15.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

75.77%

▼-2.55 pp QoQ

Shares Held by Institutions

18.04Mn

of 23.80Mn outstanding

▼-2.92% QoQ

Shares Outstanding

23.80Mn

5.77Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▼-1 vs prior quarter

Net Shares Added (QoQ)

-542.79K

distributed since last quarter

Value of Holdings

$37.33Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 10, 2026

Kalaris Therapeutics, Inc. (NASDAQ:KLRS) was reported as a holding by 57 institutional investors in 13F filings for the quarter ended June 30, 2026.

These investors held 75.77% of Kalaris Therapeutics' outstanding shares at the end of Q2 2026, down from 78.31% in Q1 2026.
Total shares held in KLRS fell 2.92% from Q1 2026; the number of holders rose 96.55% from Q2 2025.
Of the 57 holders, 28 added to their positions, 9 reduced their stakes and 20 left their positions unchanged in Q2 2026.
In total, institutional investors held 18.04Mn shares of Kalaris Therapeutics at the end of Q2 2026, down 542.79K from the prior quarter and up 4.68Mn from a year earlier.
As of June 30, 2026, Samsara BioCapital, LLC held the largest stake in Kalaris Therapeutics with 12.88Mn shares, or 54.11% of shares outstanding.
Among existing holders, the largest additions to Kalaris Therapeutics in Q2 2026 came from UBS Group AG (+255.95K shares), Vanguard Capital Management LLC (+143.36K shares), Renaissance Technologies LLC (+83.2K shares), Marshall Wace, LLP (+71.32K shares) and Morgan Stanley (+33.98K shares).
On the other side, among holders that kept a position in Kalaris Therapeutics, the largest reductions in Q2 2026 came from Goldman Sachs Group Inc (-94.45K shares), Samsara BioCapital, LLC (-66.91K shares), Susquehanna International Group, LLP (-38.46K shares), Raymond James Financial Inc (-21.72K shares) and Two Sigma Investments, LP (-6.8K shares).
Per Business Quant data, the 10 largest holders of Kalaris Therapeutics at the end of Q2 2026 were Samsara BioCapital, LLC (12.88Mn shares), RTW Investments, LP (1.3Mn shares), Alyeska Investment Group, L.P. (572.69K shares), Siren, L.L.C. (435.8K shares), Vanguard Capital Management LLC (398.71K shares), Ikarian Capital, LLC (360K shares), UBS Group AG (262.13K shares), Renaissance Technologies LLC (149.35K shares), Marshall Wace, LLP (139.2K shares) and Geode Capital Management, LLC (114.04K shares).

Form 13F Holdings

57 Institutional Holders

Report period 30 Jun, 2026

Total shares held 18.04Mn

Of outstanding 75.77%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Samsara BioCapital, LLC	0001744967	12,881,175	54.11%	▼66,906	-0.52%	$52.43Mn
2	RTW INVESTMENTS, LP	0001493215	1,300,000	5.46%	0	0.00%	$5.29Mn
3	Alyeska Investment Group, L.P.	0001453072	572,687	2.41%	0	0.00%	$2.33Mn
4	Siren, L.L.C.	0002005245	435,798	1.83%	0	0.00%	$1.77Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	398,712	1.67%	▲143,364	+56.14%	$1.62Mn
6	Ikarian Capital, LLC	0001778253	360,000	1.51%	0	0.00%	$1.47Mn
7	UBS Group AG	0001610520	262,131	1.10%	▲255,947	+4,138.86%	$1.07Mn
8	RENAISSANCE TECHNOLOGIES LLC	0001037389	149,351	0.63%	▲83,200	+125.77%	$607.86K
9	MARSHALL WACE, LLP	0001318757	139,201	0.58%	▲71,322	+105.07%	$566.55K
10	GEODE CAPITAL MANAGEMENT, LLC	0001214717	114,037	0.48%	▲26,492	+30.26%	$464.29K
11	Woodline Partners LP	0001784547	100,000	0.42%	0	0.00%	$407.00K
11	ADAR1 Capital Management, LLC	0001940272	100,000	0.42%	0	0.00%	$407.00K
12	WHI TRUST Co LLC	0002013902	97,493	0.41%	0	0.00%	$396.80K
13	Raymond James Financial Inc	0000720005	97,164	0.41%	▼21,723	-18.27%	$395.46K
14	CITADEL ADVISORS LLC	0001423053	95,772	0.40%	▲95,772	0.00%	$389.79K
15	BOOTHBAY FUND MANAGEMENT, LLC	0001549230	92,261	0.39%	0	0.00%	$375.50K
16	Verdad Advisers, LP	0001812822	80,297	0.34%	▲80,297	0.00%	$326.81K
17	Morgan Stanley	0000895421	72,326	0.30%	▲33,982	+88.62%	$294.37K
18	VANGUARD FIDUCIARY TRUST CO	0000933478	66,179	0.28%	▲29,462	+80.24%	$269.35K
19	BlackRock, Inc.	0002012383	54,442	0.23%	▲18,399	+51.05%	$221.58K

Showing 1 to 20 of 57 holders