Kalaris TherapeuticsKLRS
13F holders, Q1 2026 (March 31)58holders +7
12new positions
7sold out
2famous investors
$5.77avg. 13F price*
At the end of Q1 2026, 58 institutions reported holding Kalaris Therapeutics Inc. (KLRS) in their 13F filings, up 7 from Q4 2025. 12 opened new positions and 7 sold out. The largest holders were Samsara Biocapital, LLC ($74.7M), RTW Investments, LP ($7.5M) and Paradigm Biocapital Advisors LP ($4.0M). 2 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Kalaris Therapeutics Inc.
- CUSIP
- 482929106
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 12 | $865K |
| Exits | 7 | $1.6M |
All 13F filers, Q4 2025 → Q1 2026: 837,431 shares bought and 254,829 shares sold, net +582,602 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 58 holders
| Samsara Biocapital, LLC | 7.26% | No change | 12,948,081 | $74.7M |
| RTW Investments, LP | 0.07% | No change | 1,300,000 | $7.5M |
| Paradigm Biocapital Advisors LP | 0.08% | No change | 700,000 | $4.0M |
| Alyeska Investment Group, L.P. | 0.01% | Add +41.9% | 572,687 | $3.3M |
| Siren, L.L.C. | 0.07% | No change | 435,798 | $2.5M |
| Ikarian Capital, LLC | 0.30% | No change | 360,000 | $2.1M |
| Propel Bio Management, LLC | 1.08% | Add +603.3% | 295,771 | $1.7M |
| Vanguard Capital Management LLC | 0.00% | — | 255,348 | $1.5M |
| Kalehua Capital Management LLC | 0.55% | Reduce -3.1% | 135,585 | $782K |
| Raymond James Financial Inc. | 0.00% | Add +34.4% | 118,887 | $686K |
| Goldman Sachs Group Inc. | 0.00% | Add +222.1% | 110,503 | $638K |
| ADAR1 Capital Management, LLC | 0.04% | No change | 100,000 | $577K |
| Woodline Partners LP | 0.00% | No change | 100,000 | $577K |
| WHI TRUST Co LLC | 0.42% | No change | 97,493 | $563K |
| Boothbay Fund Management, LLC | 0.01% | No change | 92,261 | $532K |
| Geode Capital Management, LLC | 0.00% | Add +5.9% | 87,545 | $505K |
| Simplify Asset Management Inc. | 0.01% | Add +335.5% | 87,426 | $504K |
| Marshall Wace, LLP | 0.00% | Reduce -6.9% | 67,879 | $392K |
| Renaissance Technologies | 0.00% | Reduce -24.6% | 66,151 | $382K |
| Millennium Management | 0.00% | New | 59,534 | $344K |
| Susquehanna International Group, LLP | 0.00% | Add +309.8% | 52,684 | $304K |
| 683 Capital Management, LLC | 0.03% | Reduce -44.2% | 45,000 | $260K |
| Fortis Capital Advisors, LLC | 0.03% | No change | 40,000 | $231K |
| Belpointe Asset Management LLC | 0.01% | No change | 40,000 | $231K |
| Squarepoint Ops LLC | 0.00% | Add +56.8% | 39,773 | $229K |
| Morgan Stanley | 0.00% | Add +37.2% | 38,344 | $221K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 36,717 | $212K |
| BlackRock, Inc. | 0.00% | Reduce -6.3% | 36,043 | $208K |
| Two Sigma Investments, LP | 0.00% | Add +10.4% | 30,650 | $177K |
| State Street Corp. | 0.00% | Add +4.3% | 26,510 | $153K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 22,500 | $130K |
| Stonepine Capital Management, LLC | 0.10% | New | 20,400 | $118K |
| Velan Capital Investment Management LP | 0.07% | New | 18,000 | $104K |
| RBF Capital, LLC | 0.00% | No change | 17,391 | $100K |
| Northern Trust Corp. | 0.00% | Add +5.8% | 14,449 | $83K |
| Independent Advisor Alliance | 0.00% | New | 14,230 | $82K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Add +34.4% | 13,655 | $79K |
| WealthTrust Asset Management, LLC | 0.04% | New | 12,416 | $72K |
| HRT Financial LP | 0.00% | New | 11,617 | $67K |
| Qube Research & Technologies Ltd | 0.00% | New | 11,103 | $64K |
| Johnson Financial Group, Inc. | 0.00% | No change | 10,000 | $58K |
| Citigroup Inc. | 0.00% | Add +870200.0% | 8,703 | $50K |
| FMR LLC | 0.00% | No change | 7,806 | $45K |
| UBS Group AG | 0.00% | Add +129.8% | 6,184 | $36K |
| Barclays PLC | 0.00% | Reduce -12.9% | 5,280 | $30K |
| Nano Cap New Millennium Growth Fund L P | 0.02% | No change | 4,000 | $23K |
| Steward Partners Investment Advisory, LLC | 0.00% | New | 2,215 | $13K |
| Vanguard Global Advisers, LLC | 0.00% | — | 725 | $4K |
| BNP Paribas Financial Markets | 0.00% | Add +1153.8% | 652 | $4K |
| Strengthening Families & Communities, LLC | 0.00% | New | 268 | $2K |
| Royal Bank of Canada | 0.00% | Reduce -8.8% | 103 | $1K |
| Tower Research Capital LLC (TRC) | 0.00% | New | 139 | $802 |
| Fortitude Family Office, LLC | 0.00% | No change | 114 | $658 |
| Parallel Advisors, LLC | 0.00% | No change | 49 | $283 |
| JPMorgan Chase & Co. | 0.00% | No change | 50 | $265 |
| Federated Hermes, Inc. | 0.00% | New | 34 | $196 |
| Harbour Investments, Inc. | 0.00% | New | 13 | $75 |
| SBI Securities Co., Ltd. | 0.00% | No change | 5 | $29 |
"% of holder's portfolio" is KLRS's weight in each manager's 13F, not the share of Kalaris Therapeutics Inc. the manager owns.