KLRS
Kalaris Therapeutics, Inc.
$4.75
+0.22 (+4.86%)
At close · Jul 2
Market Cap
$113.01M
Shares
23,792,278
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.
Holders: 58
Total Value: $107,199,483
Total Shares: 18,578,771
Institutional Ownership Trend
5 quarters
Holder Concentration
Across 58 13F filers · Δ vs Dec 31, 2025Top Holder
69.7%
−2.3 pts
Top 5
85.9%
−1.8 pts
Top 10
92.2%
−1.1 pts
HHI
4,947
Highly concentrated−318
Quarterly Activity
vs Dec 31, 2025
New
15
Increased
16
Decreased
7
Sold Out
8
Unchanged
20
Holder count:
+7
Institutional value:
-29.4%
Shares held:
+3.2%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Small Propel Bio Management, LLC | +253,718 | 295,771 | |
| Large Alyeska Investment Group, L.P. | +169,136 | 572,687 | |
| Mega GOLDMAN SACHS GROUP INC | +76,200 | 110,503 | |
| Small Simplify Asset Management Inc. | +67,352 | 87,426 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | +39,828 | 52,684 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid 683 Capital Management, LLC | −35,590 | 45,000 | |
| Large RENAISSANCE TECHNOLOGIES LLC | −21,600 | 66,151 | |
| Large MARSHALL WACE, LLP | −4,997 | 67,879 | |
| Small Kalehua Capital Management LLC | −4,316 | 135,585 | |
| Mega BlackRock, Inc. | −2,411 | 36,043 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 255,348 | $1,473,357 | |
| Mega MILLENNIUM MANAGEMENT LLC | 59,534 | $343,511 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 36,717 | $211,857 | |
| Small Stonepine Capital Management, LLC | 20,400 | $117,708 | |
| Small Velan Capital Investment Management LP | 18,000 | $103,860 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 292,790 | $2,471,147 | |
| Mid Redmile Group, LLC | 82,955 | $700,140 | |
| Mega JANE STREET GROUP, LLC | 33,114 | $279,482 | |
| Large OMERS ADMINISTRATION Corp | 30,000 | $253,200 | |
| Large Walleye Capital LLC | 11,225 | $94,739 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid SAMSARA BIOCAPITAL, LLC | $74,710,427 | 69.69% | 12,948,081 | Shares | Sole | 2026-05-15 | ||||
| Large RTW INVESTMENTS, LP | $7,501,000 | 7.00% | 1,300,000 | Shares | Sole | 2026-05-15 | ||||
| Mid Paradigm Biocapital Advisors LP | $4,039,000 | 3.77% | 700,000 | Shares | Sole | 2026-05-15 | ||||
| Large Alyeska Investment Group, L.P. | $3,304,403 | 3.08% | 572,687 | Shares | Sole | 2026-05-15 | ||||
| Mid Siren, L.L.C. | $2,514,554 | 2.35% | 435,798 | Shares | Defined | 2026-05-14 | ||||
| Mid Ikarian Capital, LLC | $2,077,200 | 1.94% | 360,000 | Shares | Sole | 2026-05-15 | ||||
| Small Propel Bio Management, LLC | $1,706,598 | 1.59% | 295,771 | Shares | Defined | 2026-05-14 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $1,473,357 | 1.37% | 255,348 | Shares | Defined | 2026-05-15 | ||||
| Small Kalehua Capital Management LLC | $782,325 | 0.73% | 135,585 | Shares | Sole | 2026-05-15 | ||||
| Mega RAYMOND JAMES FINANCIAL INC | $685,977 | 0.64% | 118,887 | Shares | Defined | 2026-05-14 | ||||
| Mega GOLDMAN SACHS GROUP INC | $637,601 | 0.59% | 110,503 | Shares | Defined | 2026-05-15 | ||||
| Large Woodline Partners LP | $577,000 | 0.54% | 100,000 | Shares | Sole | 2026-05-15 | ||||
| Mid ADAR1 Capital Management, LLC | $577,000 | 0.54% | 100,000 | Shares | Sole | 2026-05-18 | ||||
| Micro WHI TRUST Co LLC Bank | $562,534 | 0.52% | 97,493 | Shares | Sole | 2026-04-24 | ||||
| Mid BOOTHBAY FUND MANAGEMENT, LLC | $532,345 | 0.50% | 92,261 | Shares | Other | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $505,133 | 0.47% | 87,545 | Shares | Defined | 2026-05-15 | ||||
| Small Simplify Asset Management Inc. | $504,448 | 0.47% | 87,426 | Shares | Sole | 2026-04-27 | ||||
| Large MARSHALL WACE, LLP | $391,660 | 0.37% | 67,879 | Shares | Other | 2026-05-15 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $381,691 | 0.36% | 66,151 | Shares | Sole | 2026-05-14 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $343,511 | 0.32% | 59,534 | Shares | Sole | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $303,986 | 0.28% | 52,684 | Shares | Other | 2026-05-15 | ||||
| Mid 683 Capital Management, LLC | $259,650 | 0.24% | 45,000 | Shares | Defined | 2026-05-15 | ||||
| Mid Belpointe Asset Management LLC | $230,800 | 0.22% | 40,000 | Shares | Other | 2026-04-28 | ||||
| Small Fortis Capital Advisors, LLC | $230,800 | 0.22% | 40,000 | Shares | Sole | 2026-04-28 | ||||
| Large Squarepoint Ops LLC | $229,490 | 0.21% | 39,773 | Shares | Defined | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $221,243 | 0.21% | 38,344 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $211,857 | 0.20% | 36,717 | Shares | Defined | 2026-05-08 | ||||
| Mega BlackRock, Inc. | $207,967 | 0.19% | 36,043 | Shares | Sole | 2026-05-13 | ||||
| Mega TWO SIGMA INVESTMENTS, LP | $176,850 | 0.16% | 30,650 | Shares | Sole | 2026-05-15 | ||||
| Mega STATE STREET CORP | $152,962 | 0.14% | 26,510 | Shares | Defined | 2026-05-15 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $129,825 | 0.12% | 22,500 | Shares | Sole | 2026-05-15 | ||||
| Small Stonepine Capital Management, LLC | $117,708 | 0.11% | 20,400 | Shares | Sole | 2026-05-14 | ||||
| Small Velan Capital Investment Management LP | $103,860 | 0.10% | 18,000 | Shares | Sole | 2026-05-15 | ||||
| Mid RBF Capital, LLC | $100,346 | 0.09% | 17,391 | Shares | Sole | 2026-05-18 | ||||
| Mega NORTHERN TRUST CORP Bank | $83,370 | 0.08% | 14,449 | Shares | Defined | 2026-05-14 | ||||
| Mid Independent Advisor Alliance | $82,107 | 0.08% | 14,230 | Shares | Sole | 2026-05-12 | ||||
| Large Connor, Clark & Lunn Investment Management Ltd. | $78,789 | 0.07% | 13,655 | Shares | Sole | 2026-05-11 | ||||
| Micro WealthTrust Asset Management, LLC | $71,640 | 0.07% | 12,416 | Shares | Sole | 2026-05-06 | ||||
| Large HRT FINANCIAL LP | $67,030 | 0.06% | 11,617 | Shares | Defined | 2026-05-14 | ||||
| Large Qube Research & Technologies Ltd | $64,064 | 0.06% | 11,103 | Shares | Sole | 2026-05-15 | ||||
| Small Johnson Financial Group, Inc. | $57,700 | 0.05% | 10,000 | Shares | Defined | 2026-05-07 | ||||
| Mega CITIGROUP INC | $50,216 | 0.05% | 8,703 | Shares | Defined | 2026-05-11 | ||||
| Mega FMR LLC | $45,040 | 0.04% | 7,806 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $35,681 | 0.03% | 6,184 | Shares | Defined | 2026-05-05 | ||||
| Mega BARCLAYS PLC | $30,465 | 0.03% | 5,280 | Shares | Defined | 2026-05-15 | ||||
| Micro NANO CAP NEW MILLENNIUM GROWTH FUND L P | $23,080 | 0.02% | 4,000 | Shares | Sole | 2026-05-15 | ||||
| Large Steward Partners Investment Advisory, LLC | $12,780 | 0.01% | 2,215 | Shares | Sole | 2026-05-08 | ||||
| Mega Vanguard Global Advisers, LLC | $4,183 | 0.00% | 725 | Shares | Defined | 2026-05-08 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $3,762 | 0.00% | 652 | Shares | Defined | 2026-05-12 | ||||
| Small Strengthening Families & Communities, LLC | $1,546 | 0.00% | 268 | Shares | Sole | 2026-05-11 | ||||
| Mid Tower Research Capital LLC (TRC) | $802 | 0.00% | 139 | Shares | Defined | 2026-05-15 | ||||
| Micro Fortitude Family Office, LLC Family Office | $657 | 0.00% | 114 | Shares | Sole | 2026-04-16 | ||||
| Mega ROYAL BANK OF CANADA Bank | $594 | 0.00% | 103 | Shares | Defined | 2026-05-15 | ||||
| Mega JPMORGAN CHASE & CO | $288 | 0.00% | 50 | Shares | Defined | 2026-05-13 | ||||
| Mid Parallel Advisors, LLC | $282 | 0.00% | 49 | Shares | Sole | 2026-05-07 | ||||
| Large FEDERATED HERMES, INC. | $196 | 0.00% | 34 | Shares | Defined | 2026-05-11 | ||||
| Mid HARBOUR INVESTMENTS, INC. | $75 | 0.00% | 13 | Shares | Sole | 2026-05-15 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $28 | 0.00% | 5 | Shares | Defined | 2026-04-28 | ||||
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