KLRS · Kalaris Therapeutics, Inc. · Holdings

$2.26 -0.10 (-4.24%) At close · Oct 12

Market Cap

$56.18M

23.80M

Volume · Oct 12 122.09K Avg daily vol (3M) 250.65K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.

Quarter:

Holders: 56

Total Value: $73,386,065

Total Shares: 18,030,981

Institutional Ownership Trend

7 quarters

Holder Concentration

Across 56 13F filers · Δ vs Mar 31, 2026

Top Holder

71.4%

+1.7 pts

Top 5

86.5%

+0.6 pts

Top 10

92.1%

−0.0 pts

HHI

5,187

Highly concentrated+240

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -2

Institutional value: -31.5%

Shares held: -2.9%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega UBS Group AG	+255,947	262,131
Mega VANGUARD CAPITAL MANAGEMENT LLC	+143,364	398,712
Large RENAISSANCE TECHNOLOGIES LLC	+83,200	149,351
Mega MARSHALL WACE, LLP	+71,322	139,201
Mega MORGAN STANLEY	+33,982	72,326

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega GOLDMAN SACHS GROUP INC	−94,449	16,054
Mid SAMSARA BIOCAPITAL, LLC	−66,906	12,881,175
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−38,463	14,221
Mega RAYMOND JAMES FINANCIAL INC	−21,723	97,164
Mega TWO SIGMA INVESTMENTS, LP	−6,803	23,847

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega CITADEL ADVISORS LLC	95,772	$389,792
Small Verdad Advisers, LP	80,297	$326,808
Mid Pale Fire Capital SE	39,626	$161,277
Large Trexquant Investment LP	29,737	$121,029
Large Quadrature Capital Ltd	16,527	$67,264

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mid Paradigm Biocapital Advisors LP	700,000	$4,039,000
Small Propel Bio Management, LLC	295,771	$1,706,598
Small Kalehua Capital Management LLC	135,585	$782,325
Mid Simplify Asset Management Inc.	87,426	$504,448
Mega MILLENNIUM MANAGEMENT LLC	59,534	$343,511

Filter: New 9 Increased 18 Reduced 9 Sold out 11 Unchanged 20

Showing 56 of 56

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

SAMSARA BIOCAPITAL, LLC

$52,426,382

71.44%

12,881,175

RTW INVESTMENTS, LP

$5,291,000

7.21%

1,300,000

Alyeska Investment Group, L.P.

$2,330,836

3.18%

572,687

Siren, L.L.C.

$1,773,697

2.42%

435,798

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invus Group, LLC	435,798	$1,773,697	100.0%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$1,622,757

2.21%

398,712

Ikarian Capital, LLC

$1,465,200

2.00%

360,000

UBS Group AG

$1,066,873

1.45%

262,131

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	262,131	$1,066,873	100.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$607,858

0.83%

149,351

MARSHALL WACE, LLP

$566,547

0.77%

139,201

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	139,201	$566,547	100.0%	Other

GEODE CAPITAL MANAGEMENT, LLC

$464,130

0.63%

114,037

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	14,731	$59,955	12.9%	Defined
Held directly	99,306	$404,175	87.1%	Defined

ADAR1 Capital Management, LLC

$407,000

0.55%

100,000

Woodline Partners LP

$407,000

0.55%

100,000

WHI TRUST Co LLC

$396,796

0.54%

97,493

RAYMOND JAMES FINANCIAL INC

$395,457

0.54%

97,164

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RAYMOND JAMES & ASSOCIATES	7,000	$28,490	7.2%	Defined
Raymond James Financial Services Advisors, Inc.	90,164	$366,967	92.8%	Defined

CITADEL ADVISORS LLC

$389,792

0.53%

95,772

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	95,772	$389,792	100.0%	Defined

BOOTHBAY FUND MANAGEMENT, LLC

$375,502

0.51%

92,261

Verdad Advisers, LP

$326,808

0.45%

80,297

MORGAN STANLEY

$294,366

0.40%

72,326

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY CAPITAL SERVICES, LLC	17,111	$69,641	23.7%	Defined
MORGAN STANLEY SMITH BARNEY LLC	55,215	$224,725	76.3%	Defined

VANGUARD FIDUCIARY TRUST CO

$269,348

0.37%

66,179

BlackRock, Inc.

$221,577

0.30%

54,442

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Investment Management, LLC	1,725	$7,020	3.2%	Sole
BlackRock Fund Advisors	25,924	$105,510	47.6%	Sole
BlackRock Institutional Trust Company, N.A.	26,793	$109,047	49.2%	Sole

Fortis Capital Advisors, LLC

$162,800

0.22%

40,000

Belpointe Asset Management LLC

$162,800

0.22%

40,000

Pale Fire Capital SE

$161,277

0.22%

39,626

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Barta Jan joint	39,626	$161,277	100.0%	Defined

Squarepoint Ops LLC

$157,814

0.22%

38,775

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	38,775	$157,814	100.0%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$132,275

0.18%

32,500

Stonepine Capital Management, LLC

$122,596

0.17%

30,122

Connor, Clark & Lunn Investment Management Ltd.

$122,128

0.17%

30,007

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	30,007	$122,128	100.0%	Sole

Trexquant Investment LP

$121,029

0.16%

29,737

STATE STREET CORP

$107,895

0.15%

26,510

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	26,510	$107,895	100.0%	Defined

NORTHERN TRUST CORP

$105,164

0.14%

25,839

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	25,839	$105,164	100.0%	Defined

Velan Capital Investment Management LP

$101,750

0.14%

25,000

TWO SIGMA INVESTMENTS, LP

$97,057

0.13%

23,847

WealthTrust Asset Management, LLC

$83,093

0.11%

20,416

Independent Advisor Alliance

$73,768

0.10%

18,125

RBF Capital, LLC

$70,781

0.10%

17,391

Quadrature Capital Ltd

$67,264

0.09%

16,527

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	16,527	$67,264	100.0%	Other

GOLDMAN SACHS GROUP INC

$65,339

0.09%

16,054

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	16,054	$65,339	100.0%	Defined

DIMENSIONAL FUND ADVISORS LP

$64,947

0.09%

15,958

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	290	$1,180	1.8%	Defined
DFA Australia Ltd.	2,793	$11,367	17.5%	Defined
Dimensional Ireland Ltd	1,040	$4,232	6.5%	Defined
Held directly	11,835	$48,168	74.2%	Sole

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$57,879

0.08%

14,221

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	14,221	$57,879	100.0%	Other

HRT FINANCIAL LP

$55,852

0.08%

13,723

NANO CAP NEW MILLENNIUM GROWTH FUND L P

$50,875

0.07%

12,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AZG TANGIBLE ASSETS FUND LLC	12,500	$50,875	100.0%	Sole

Virtu Financial LLC

$44,139

0.06%

10,845

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	10,845	$44,139	100.0%	Defined

Sigma Planning Corp

$41,379

0.06%

10,167

FMR LLC

$31,770

0.04%

7,806

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	7,806	$31,770	100.0%	Defined

Tower Research Capital LLC (TRC)

$10,419

0.01%

2,560

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	2,560	$10,419	100.0%	Defined

Steward Partners Investment Advisory, LLC

$9,015

0.01%

2,215

Vanguard Global Advisers, LLC

$2,950

0.00%

725

BARCLAYS PLC

$1,233

0.00%

303

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS CAPITAL INC.	303	$1,233	100.0%	Defined

Strengthening Families & Communities, LLC

$1,090

0.00%

268

BNP PARIBAS ARBITRAGE, SA

$211

0.00%

JPMORGAN CHASE & CO

$203

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	4	$16	7.9%	Defined
J.P. Morgan Securities plc	46	$187	92.1%	Defined

Parallel Advisors, LLC

$199

0.00%

HARBOUR INVESTMENTS, INC.

$52

0.00%

ROYAL BANK OF CANADA

$48

0.00%

Caitong International Asset Management Co., Ltd

$28

0.00%

SBI Securities Co., Ltd.

$20

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
683 Capital Partners, LP	45,000	$259,650	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JOHNSON BANK	10,000	$57,700	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	8,703	$50,216	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FEDERATED MDTA LLC	34	$196	100.0%	Defined

Key facts CIK 1754068 CUSIP 482929106 13F (30d) 1 filings 1 filers Visit website Investor relations