Who owns Kalaris Therapeutics (KLRS)
Which tracked institutional funds hold KLRS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See KLRS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on KLRS is one-sided between 2026-Q1 and 2026-Q2: 2 added or opened and 11 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
KLRS’s largest tracked holder by dollar value, SAMSARA BIOCAPITAL, LLC, sizes it at 4.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 4.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in KLRS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 55 tracked filers holding KLRS, 26 increased or opened the position and 21 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in KLRS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
Full exits 4
- Paradigm Biocapital Advisors LP$4M
- Propel Bio Management, LLC$2M
- Kalehua Capital Management LLC$782K
- Simplify Asset Management Inc.$504K
Largest adds
- UBS Group AG$1M
- MARSHALL WACE, LLP$345K
Largest trims
- SAMSARA BIOCAPITAL, LLC$22M
- RTW INVESTMENTS, LP$2M
- Alyeska Investment Group, L.P.$944K
- Siren, L.L.C.$741K
- Ikarian Capital, LLC$612K
- GOLDMAN SACHS GROUP INC$572K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| SAMSARA BIOCAPITAL, LLC trimmed | 12,881,175 | $52M | 58.6% | 2026-Q2 |
| RTW INVESTMENTS, LP | 1,300,000 | $5M | 5.9% | 2026-Q2 |
| Alyeska Investment Group, L.P. | 572,687 | $2M | 2.6% | 2026-Q2 |
| Siren, L.L.C. | 435,798 | $2M | 2.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 398,712 | $2M | 1.8% | 2026-Q2 |
| Ikarian Capital, LLC | 360,000 | $1M | 1.6% | 2026-Q2 |
| UBS Group AG added | 262,131 | $1M | 1.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 149,351 | $608K | 0.7% | 2026-Q2 |
| MARSHALL WACE, LLP added | 139,201 | $567K | 0.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 114,037 | $464K | 0.5% | 2026-Q2 |
| Woodline Partners LP | 100,000 | $407K | 0.5% | 2026-Q2 |
| ADAR1 Capital Management, LLC | 100,000 | $407K | 0.5% | 2026-Q2 |
| WHI TRUST Co LLC | 97,493 | $397K | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 97,164 | $395K | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC new | 95,772 | $390K | 0.4% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC | 92,261 | $376K | 0.4% | 2026-Q2 |
| Verdad Advisers, LP new | 80,297 | $327K | 0.4% | 2026-Q2 |
| MORGAN STANLEY added | 72,326 | $294K | 0.3% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 66,179 | $269K | 0.3% | 2026-Q2 |
| BlackRock, Inc. added | 54,442 | $222K | 0.2% | 2026-Q2 |
| Belpointe Asset Management LLC | 40,000 | $163K | 0.2% | 2026-Q2 |
| Fortis Capital Advisors, LLC | 40,000 | $163K | 0.2% | 2026-Q2 |
| Pale Fire Capital SE new | 39,626 | $161K | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 38,775 | $158K | 0.2% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 32,500 | $132K | 0.1% | 2026-Q2 |
| Stonepine Capital Management, LLC added | 30,122 | $123K | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 30,007 | $122K | 0.1% | 2026-Q2 |
| Trexquant Investment LP new | 29,737 | $121K | 0.1% | 2026-Q2 |
| STATE STREET CORP | 26,510 | $108K | 0.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 25,839 | $105K | 0.1% | 2026-Q2 |
| Velan Capital Investment Management LP added | 25,000 | $102K | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 23,847 | $97K | 0.1% | 2026-Q2 |
| WealthTrust Asset Management, LLC added | 20,416 | $83K | 0.1% | 2026-Q2 |
| Independent Advisor Alliance added | 18,125 | $74K | 0.1% | 2026-Q2 |
| RBF Capital, LLC | 17,391 | $71K | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd new | 16,527 | $67K | 0.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 16,054 | $65K | 0.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP new | 15,958 | $65K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 14,221 | $58K | 0.1% | 2026-Q2 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P added | 12,500 | $51K | 0.1% | 2026-Q2 |
| Sigma Planning Corp new | 10,167 | $41K | 0.0% | 2026-Q2 |
| FMR LLC | 7,806 | $32K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 5,000 | $20K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 2,560 | $10K | 0.0% | 2026-Q2 |
| Steward Partners Investment Advisory, LLC | 2,215 | $9K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 725 | $3K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 303 | $1K | 0.0% | 2026-Q2 |
| Strengthening Families & Communities, LLC | 268 | $1K | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 52 | $212 | 0.0% | 2026-Q2 |
| JPMORGAN CHASE & CO | 50 | $211 | 0.0% | 2026-Q2 |
| Parallel Advisors, LLC | 49 | $199 | 0.0% | 2026-Q2 |
| HARBOUR INVESTMENTS, INC. | 13 | $53 | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd new | 7 | $28 | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. | 5 | $20 | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 12 | — | 0.0% | 2026-Q2 |
| Paradigm Biocapital Advisors LP | 700,000 | $4M | 4.5% | 2026-Q1 stale (1 quarter behind) |
| Propel Bio Management, LLC added | 295,771 | $2M | 1.9% | 2026-Q1 stale (1 quarter behind) |
| Kalehua Capital Management LLC trimmed | 135,585 | $782K | 0.9% | 2026-Q1 stale (1 quarter behind) |
| Simplify Asset Management Inc. added | 87,426 | $504K | 0.6% | 2026-Q1 stale (1 quarter behind) |
| MILLENNIUM MANAGEMENT LLC added | 59,534 | $344K | 0.4% | 2026-Q1 stale (1 quarter behind) |
| 683 Capital Management, LLC trimmed | 45,000 | $260K | 0.3% | 2026-Q1 stale (1 quarter behind) |
| HRT FINANCIAL LP new | 11,617 | $67K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Qube Research & Technologies Ltd new | 11,103 | $64K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Johnson Financial Group, Inc. | 10,000 | $58K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| CITIGROUP INC added | 8,703 | $50K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Fortitude Family Office, LLC | 114 | $658 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| FEDERATED HERMES, INC. trimmed | 34 | $196 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| VANGUARD GROUP INC added | 292,790 | $2M | 2.8% | 2025-Q4 stale (2 quarters behind) |
| Redmile Group, LLC | 82,955 | $700K | 0.8% | 2025-Q4 stale (2 quarters behind) |
| JANE STREET GROUP, LLC new | 33,114 | $279K | 0.3% | 2025-Q4 stale (2 quarters behind) |
| OMERS ADMINISTRATION Corp new | 30,000 | $253K | 0.3% | 2025-Q4 stale (2 quarters behind) |
| Walleye Capital LLC new | 11,225 | $95K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| XTX Topco Ltd trimmed | 10,897 | $92K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| Keel Point, LLC new | 10,225 | $86K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| BANK OF AMERICA CORP /DE/ added | 6,704 | $57K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| TANG CAPITAL MANAGEMENT LLC added | 418,241 | $2M | 2.7% | 2025-Q3 stale (3 quarters behind) |
| Farther Finance Advisors, LLC | 33 | $191 | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Octagon Capital Advisors LP trimmed | 360,000 | $961K | 1.1% | 2025-Q2 stale (4 quarters behind) |
| GILEAD SCIENCES, INC. trimmed | 317,789 | $848K | 0.9% | 2025-Q2 stale (4 quarters behind) |
| TWO SIGMA ADVISERS, LP trimmed | 20,281 | $54K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.