KALARIS THERAPEUTICS INC KLRS
COM · Common Stock · CUSIP 482929106
- SectorHealth care
- IndustryBiological Products, (No Diagnostic Substances)
- HeadquartersBerkeley Heights, NJ
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 23.8m as of 2026-08-04, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $4.07.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q1 2025 | 33 |
| Q2 2025 | 31 |
| Q3 2025 | 32 |
| Q4 2025 | 51 |
| Q1 2026 | 58 |
| Q2 2026 | 57 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q2 2025 | 13 | 13 |
| Q3 2025 | 18 | 12 |
| Q4 2025 | 32 | 13 |
| Q1 2026 | 29 | 14 |
| Q2 2026 | 28 | 20 |
Biggest buyers
| UBS Group AG | Added | +255.9k |
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +143.4k |
| CITADEL ADVISORS LLC | New | +95.8k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +83.2k |
| Verdad Advisers, LP | New | +80.3k |
| MARSHALL WACE, LLP | Added | +71.3k |
| Pale Fire Capital SE | New | +39.6k |
| MORGAN STANLEY | Added | +34.0k |
| Trexquant Investment LP | New | +29.7k |
| VANGUARD FIDUCIARY TRUST CO | Added | +29.5k |
Biggest sellers
| Paradigm Biocapital Advisors LP | Sold out | -700.0k |
| Propel Bio Management, LLC | Sold out | -295.8k |
| Kalehua Capital Management LLC | Sold out | -271.2k |
| GOLDMAN SACHS GROUP INC | Reduced | -94.4k |
| Simplify Asset Management Inc. | Sold out | -87.4k |
| SAMSARA BIOCAPITAL, LLC | Reduced | -66.9k |
| MILLENNIUM MANAGEMENT LLC | Sold out | -59.5k |
| 683 Capital Management, LLC | Sold out | -45.0k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -38.5k |
| RAYMOND JAMES FINANCIAL INC | Reduced | -21.7k |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Samsara BioCapital, L.P. 13D · may seek influence -2.3 pts · filed 2026-05-22 | 54.2% |
| RTW INVESTMENTS, LP 13G · institution new · filed 2026-02-17 | 5.7% |
| Coastlands Capital LP 13G · institution new · filed 2026-10-26 | 5.7% |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 4 | — | — |
| Q1 2025 | 0 | — | 3 | $15.3k | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 1 | $5.0m | 0 | — | — |
| Q1 2026 | 0 | — | 1 | $12.9k | — |
| Q2 2026 | 1 | $1.2m | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-05-20 | AKKARAJU SRINIVAS +4 Director · By Samsara Opportunity Fund, L.P. | Bought | $1.2m244.3k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| SAMSARA BIOCAPITAL, LLC 4.31% of their portfolio | 12.9m $52.4m | Reduced -66.9k |
| RTW INVESTMENTS, LP 0.05% of their portfolio | 1.3m $5.3m | Unchanged |
| Alyeska Investment Group, L.P. 0.01% of their portfolio | 572.7k $2.3m | Unchanged |
| Siren, L.L.C. 0.04% of their portfolio | 435.8k $1.8m | Unchanged |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 398.7k $1.6m | Added +143.4k |
| Ikarian Capital, LLC 0.24% of their portfolio | 360.0k $1.5m | Unchanged |
| UBS Group AG 0.00% of their portfolio | 262.1k $1.1m | Added +255.9k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 149.4k $607.9k | Added +83.2k |
| MARSHALL WACE, LLP 0.00% of their portfolio | 139.2k $566.5k | Added +71.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 114.0k $464.3k | Added +26.5k |
| Woodline Partners LP 0.00% of their portfolio | 100.0k $407.0k | Unchanged |
| ADAR1 Capital Management, LLC 0.02% of their portfolio | 100.0k $407.0k | Unchanged |
| WHI TRUST Co LLC 0.26% of their portfolio | 97.5k $396.8k | Unchanged |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 97.2k $395.5k | Reduced -21.7k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 95.8k $389.8k | New |
| BOOTHBAY FUND MANAGEMENT, LLC 0.01% of their portfolio | 92.3k $375.5k | Unchanged |
| Verdad Advisers, LP 0.31% of their portfolio | 80.3k $326.8k | New |
| MORGAN STANLEY 0.00% of their portfolio | 72.3k $294.4k | Added +34.0k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 66.2k $269.3k | Added +29.5k |
| BlackRock, Inc. 0.00% of their portfolio | 54.4k $221.6k | Added +18.4k |
| Belpointe Asset Management LLC 0.01% of their portfolio | 40.0k $162.8k | Unchanged |
| Fortis Capital Advisors, LLC 0.02% of their portfolio | 40.0k $162.8k | Unchanged |
| Pale Fire Capital SE 0.01% of their portfolio | 39.6k $161.3k | New |
| Squarepoint Ops LLC 0.00% of their portfolio | 38.8k $157.8k | Reduced -998 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 32.5k $132.3k | Added +10.0k |
| Stonepine Capital Management, LLC 0.09% of their portfolio | 30.1k $122.6k | Added +9.7k |
| Connor, Clark & Lunn Investment Management Ltd. 0.00% of their portfolio | 30.0k $122.1k | Added +16.4k |
| Trexquant Investment LP 0.00% of their portfolio | 29.7k $121.0k | New |
| STATE STREET CORP 0.00% of their portfolio | 26.5k $107.9k | Unchanged |
| NORTHERN TRUST CORP 0.00% of their portfolio | 25.8k $105.2k | Added +11.4k |
| Velan Capital Investment Management LP 0.06% of their portfolio | 25.0k $101.8k | Added +7.0k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 23.8k $97.1k | Reduced -6.8k |
| WealthTrust Asset Management, LLC 0.04% of their portfolio | 20.4k $83.1k | Added +8.0k |
| Independent Advisor Alliance 0.00% of their portfolio | 18.1k $73.8k | Added +3.9k |
| RBF Capital, LLC 0.00% of their portfolio | 17.4k $70.8k | Unchanged |
| Quadrature Capital Ltd 0.00% of their portfolio | 16.5k $67.3k | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 16.1k $65.3k | Reduced -94.4k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 16.0k $65.0k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 14.2k $57.9k | Reduced -38.5k |
| HRT FINANCIAL LP 0.00% of their portfolio | 13.7k $55.0k | Added +2.1k |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P 0.04% of their portfolio | 12.5k $50.9k | Added +8.5k |
| Virtu Financial LLC 0.00% of their portfolio | 10.8k $44.0k | New |
| Sigma Planning Corp 0.00% of their portfolio | 10.2k $41.4k | New |
| FMR LLC 0.00% of their portfolio | 7.8k $31.8k | Unchanged |
| Integrated Wealth Concepts LLC 0.00% of their portfolio | 5.0k $20.4k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 2.6k $10.4k | Added +2.4k |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 2.2k $9.0k | Unchanged |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 725 $3.0k | Unchanged |
| BARCLAYS PLC 0.00% of their portfolio | 303 $1.2k | Reduced -5.0k |
| Strengthening Families & Communities, LLC 0.00% of their portfolio | 268 $1.1k | Unchanged |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 52 $212 | Reduced -600 |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 50 $211 | Unchanged |
| Parallel Advisors, LLC 0.00% of their portfolio | 49 $199 | Unchanged |
| HARBOUR INVESTMENTS, INC. 0.00% of their portfolio | 13 $53 | Unchanged |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 12 $0 | Reduced -91 |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 7 $28 | New |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 5 $20 | Unchanged |