$KLRS

$1.80 -$0.07 (3.74%) Close

$KLRS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 23.8M shares outstanding

Who owns KLRS?

By type of holder

Institutions 75.7% Insiders 24.3% Everyone else 0.0%

Concentration Top 10 holders own 271.2%

Samsara Biocapital, LLC 54.1% · Srinivas Akkaraju 54.2%

Institutional ownership

75.7%

-2.4 pts vs last qtr

Institutional holders

-3 vs last qtr

Net shares bought

−562.0K

by institutions in Q2 2026

New / sold out

9 / 12

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

UBS Group AG +255.9K
Vanguard Capital Management LLC +143.4K

Biggest sellers in Q2 2026

Paradigm Biocapital Advisors LP SOLD OUT −700.0K
Propel Bio Management, LLC SOLD OUT −295.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$12.9K

1 notice from 1 person

Shares covered

1.9K

0.01% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Brett R R Hagen Officer $12.9K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+1042.9%

+1042.86% a year

Each share's claim on the business

−91.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $2.83M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years81% Under 1 year19%

Quarterly turnover

7.1%

of institutional shares changed hands

Top 10 managers, median time held

1.3 years

Super Investors

Investment managers reporting KLRS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
SB Samsara Biocapital, LLC	12.9M	54.11%	−66.9K (−0.5%)	2025	4.3%
Shares held by quarter Peak holding12.9M (Q4'25) Change over 8 quarters+12.9M Share of the company54.110% Samsara Biocapital, LLC's full portfolio →
RI RTW Investments, LP	1.3M	5.46%	Unchanged	Q4 '25	0.1%
Shares held by quarter Peak holding1.3M (Q4'25) Change over 8 quarters+1.3M Share of the company5.460% RTW Investments, LP's full portfolio →

Samsara Biocapital, LLC

12.9M

% of company

54.11%

Change vs last qtr

−66.9K (−0.5%)

Held since

2025

RTW Investments, LP

1.3M

% of company

5.46%

Change vs last qtr

Unchanged

Held since

Q4 '25

28 more super investors behind a free account

See every manager holding Kalaris Therapeutics Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting KLRS on Form N-PORT; together they hold 2.9% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$1.04M	255.3K	1.07%	0.00%	June 30, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$559K	137.4K	0.58%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$1.04M

% of company

1.07%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$559K

% of company

0.58%

% of the fund

0.00%

As of

June 30, 2026

18 more funds behind a free account

See every fund holding Kalaris Therapeutics Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SA Srinivas Akkaraju 5%+ holder 13D · 54.2%	12.9M	54.19%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company54.190% Disclosed stake13D · 54.2% View the 13D/G filing →
SB Samsara BioCapital GP, LLC 5%+ holder 13D · 44.9%	10.7M	44.83%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company44.830% Disclosed stake13D · 44.9% View the 13D/G filing →

Srinivas Akkaraju

5%+ holder13D · 54.2%

12.9M

% of company

54.19%

Change vs last qtr

—

Held since

—

Samsara BioCapital GP, LLC

5%+ holder13D · 44.9%

10.7M

% of company

44.83%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of Kalaris Therapeutics Inc.

Comments