Kalaris TherapeuticsKLRS
13F holders, Q4 2025 (December 31)51holders +19
21new positions
5sold out
1famous investor
$8.44avg. 13F price*
At the end of Q4 2025, 51 institutions reported holding Kalaris Therapeutics Inc. (KLRS) in their 13F filings, up 19 from Q3 2025. 21 opened new positions and 5 sold out. The largest holders were Samsara Biocapital, LLC ($109.3M), RTW Investments, LP ($11.0M) and Paradigm Biocapital Advisors LP ($5.9M). One famous investor held it Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Kalaris Therapeutics Inc.
- CUSIP
- 482929106
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 21 | $28.3M |
| Exits | 5 | $2.6M |
All 13F filers, Q3 2025 → Q4 2025: 5,161,346 shares bought and 629,529 shares sold, net +4,531,817 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 51 holders
| Samsara Biocapital, LLC | 11.28% | Add +13.1% | 12,948,081 | $109.3M |
| RTW Investments, LP | 0.11% | New | 1,300,000 | $11.0M |
| Paradigm Biocapital Advisors LP | 0.16% | New | 700,000 | $5.9M |
| Siren, L.L.C. | 0.11% | Add +36.9% | 435,798 | $3.7M |
| Alyeska Investment Group, L.P. | 0.01% | New | 403,551 | $3.4M |
| Ikarian Capital, LLC | 0.39% | New | 360,000 | $3.0M |
| Vanguard Group Inc. | 0.00% | Add +44.2% | 292,790 | $2.5M |
| Kalehua Capital Management LLC | 1.17% | — | 139,901 | $1.2M |
| ADAR1 Capital Management, LLC | 0.06% | New | 100,000 | $844K |
| Woodline Partners LP | 0.00% | Reduce -58.5% | 100,000 | $844K |
| WHI TRUST Co LLC | 0.63% | — | 97,493 | $823K |
| Boothbay Fund Management, LLC | 0.02% | New | 92,261 | $779K |
| Raymond James Financial Inc. | 0.00% | New | 88,436 | $746K |
| Renaissance Technologies | 0.00% | Reduce -22.2% | 87,751 | $741K |
| Redmile Group, LLC | 0.05% | No change | 82,955 | $700K |
| Geode Capital Management, LLC | 0.00% | Add +28.0% | 82,647 | $698K |
| 683 Capital Management, LLC | 0.06% | New | 80,590 | $680K |
| Marshall Wace, LLP | 0.00% | Add +416.3% | 72,876 | $615K |
| Propel Bio Management, LLC | 0.30% | New | 42,053 | $355K |
| Fortis Capital Advisors, LLC | 0.05% | No change | 40,000 | $338K |
| Belpointe Asset Management LLC | 0.01% | No change | 40,000 | $338K |
| BlackRock, Inc. | 0.00% | Reduce -4.8% | 38,454 | $325K |
| Goldman Sachs Group Inc. | 0.00% | Add +52.7% | 34,303 | $290K |
| Jane Street Group, LLC | 0.00% | New | 33,114 | $279K |
| OMERS ADMINISTRATION Corp | 0.00% | New | 30,000 | $253K |
| Morgan Stanley | 0.00% | Add +12.2% | 27,948 | $236K |
| Two Sigma Investments, LP | 0.00% | New | 27,759 | $234K |
| State Street Corp. | 0.00% | Add +12.4% | 25,410 | $214K |
| Squarepoint Ops LLC | 0.00% | Reduce -36.9% | 25,367 | $214K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 22,500 | $190K |
| Simplify Asset Management Inc. | 0.00% | New | 20,074 | $169K |
| RBF Capital, LLC | 0.01% | No change | 17,391 | $147K |
| Northern Trust Corp. | 0.00% | New | 13,654 | $115K |
| Susquehanna International Group, LLP | 0.00% | New | 12,856 | $109K |
| Walleye Capital LLC | 0.00% | New | 11,225 | $95K |
| XTX Topco Ltd | 0.00% | New | 10,897 | $92K |
| Keel Point, LLC | 0.01% | New | 10,225 | $86K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | New | 10,159 | $86K |
| Johnson Financial Group, Inc. | 0.00% | No change | 10,000 | $84K |
| FMR LLC | 0.00% | No change | 7,806 | $66K |
| Bank of America Corp. | 0.00% | Add +2989.4% | 6,704 | $57K |
| Barclays PLC | 0.00% | New | 6,065 | $51K |
| Nano Cap New Millennium Growth Fund L P | 0.03% | — | 4,000 | $34K |
| UBS Group AG | 0.00% | Reduce -48.8% | 2,691 | $23K |
| Royal Bank of Canada | 0.00% | Add +32.9% | 113 | $1K |
| Fortitude Family Office, LLC | 0.00% | New | 114 | $962 |
| BNP Paribas Financial Markets | 0.00% | Reduce -63.1% | 52 | $439 |
| JPMorgan Chase & Co. | 0.00% | No change | 50 | $422 |
| Parallel Advisors, LLC | 0.00% | No change | 49 | $414 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -37.5% | 5 | $42 |
| Citigroup Inc. | 0.00% | No change | 1 | $8 |
"% of holder's portfolio" is KLRS's weight in each manager's 13F, not the share of Kalaris Therapeutics Inc. the manager owns.