Who owns KZR (KZR)
Which tracked institutional funds hold KZR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See KZR company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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 KZR is one-sided between 2025-Q4 and 2026-Q1: 10 added or opened and 3 trimmed or exited — on balance accumulating.
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
KZR’s largest tracked holder by dollar value, BML Capital Management, LLC, sizes it at 3.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 3.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in KZR 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 2025-Q4 and 2026-Q1, across 42 tracked filers holding KZR, 20 increased or opened the position and 22 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 KZR between the 2025-Q4 and 2026-Q1 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.
New buyers 3
- VANGUARD CAPITAL MANAGEMENT LLC$2M
- MILLENNIUM MANAGEMENT LLC$1M
- Groupe la Francaise$597K
Full exits 3
- VANGUARD GROUP INC$2M
- Nantahala Capital Management, LLC$2M
- Stonepine Capital Management, LLC$982K
Largest adds
- Rangeley Capital, LLC$1M
- BML Capital Management, LLC$814K
- SUVRETTA CAPITAL MANAGEMENT, LLC$810K
- TANG CAPITAL MANAGEMENT LLC$751K
- RENAISSANCE TECHNOLOGIES LLC$572K
- ACADIAN ASSET MANAGEMENT LLC$336K
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 |
|---|---|---|---|---|
| BML Capital Management, LLC | 720,787 | $5M | 12.3% | 2026-Q1 |
| SUVRETTA CAPITAL MANAGEMENT, LLC | 716,759 | $5M | 12.2% | 2026-Q1 |
| TANG CAPITAL MANAGEMENT LLC | 664,314 | $5M | 11.3% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 290,529 | $2M | 4.9% | 2026-Q1 |
| Rangeley Capital, LLC added | 243,073 | $2M | 4.1% | 2026-Q1 |
| Affinity Asset Advisors, LLC | 229,076 | $2M | 3.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 188,426 | $1M | 3.2% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 151,630 | $1M | 2.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 142,050 | $1M | 2.4% | 2026-Q1 |
| Peapod Lane Capital LLC trimmed | 126,692 | $925K | 2.1% | 2026-Q1 |
| Ikarian Capital, LLC | 102,211 | $758K | 1.7% | 2026-Q1 |
| BlackRock, Inc. added | 100,064 | $742K | 1.7% | 2026-Q1 |
| ADAR1 Capital Management, LLC trimmed | 81,933 | $608K | 1.4% | 2026-Q1 |
| Groupe la Francaise new | 80,400 | $597K | 1.4% | 2026-Q1 |
| Aldebaran Capital, LLC trimmed | 80,335 | $596K | 1.4% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 60,988 | $453K | 1.0% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 59,403 | $441K | 1.0% | 2026-Q1 |
| CREDIT INDUSTRIEL ET COMMERCIAL new | 53,600 | $398K | 0.9% | 2026-Q1 |
| TORNO CAPITAL, LLC added | 48,479 | $360K | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 41,201 | $306K | 0.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 30,334 | $225K | 0.5% | 2026-Q1 |
| RBF Capital, LLC | 28,144 | $209K | 0.5% | 2026-Q1 |
| STATE STREET CORP | 27,093 | $201K | 0.5% | 2026-Q1 |
| Yakira Capital Management, Inc. new | 24,000 | $178K | 0.4% | 2026-Q1 |
| Vazirani Asset Management LLC trimmed | 22,000 | $163K | 0.4% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 21,367 | $159K | 0.4% | 2026-Q1 |
| EQUITEC PROPRIETARY MARKETS, LLC new | 19,500 | $145K | 0.3% | 2026-Q1 |
| XTX Topco Ltd trimmed | 19,495 | $145K | 0.3% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC | 16,210 | $120K | 0.3% | 2026-Q1 |
| NORTHERN TRUST CORP | 13,763 | $102K | 0.2% | 2026-Q1 |
| FMR LLC added | 10,208 | $76K | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 5,796 | $43K | 0.1% | 2026-Q1 |
| MORGAN STANLEY trimmed | 4,285 | $32K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 1,737 | $13K | 0.0% | 2026-Q1 |
| Caitong International Asset Management Co., Ltd new | 308 | $2K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 322 | $2K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) trimmed | 262 | $2K | 0.0% | 2026-Q1 |
| JPMORGAN CHASE & CO | 109 | $812 | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS | 89 | $660 | 0.0% | 2026-Q1 |
| Allworth Financial LP | 50 | $371 | 0.0% | 2026-Q1 |
| UBS Group AG trimmed | 13 | $96 | 0.0% | 2026-Q1 |
| BARCLAYS PLC | 1 | $7 | 0.0% | 2026-Q1 |
| Avidity Partners Management LP | 502,600 | $2M | 5.3% | 2025-Q2 stale |
| VANGUARD GROUP INC added | 341,404 | $2M | 4.9% | 2025-Q4 stale |
| Nantahala Capital Management, LLC new | 276,754 | $2M | 4.0% | 2025-Q4 stale |
| Stonepine Capital Management, LLC trimmed | 156,179 | $982K | 2.3% | 2025-Q4 stale |
| ORBIMED ADVISORS LLC | 192,700 | $752K | 1.7% | 2025-Q3 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 52,929 | $333K | 0.8% | 2025-Q4 stale |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 51,638 | $325K | 0.7% | 2025-Q4 stale |
| QIMING U.S. VENTURES MANAGEMENT, LLC | 82,871 | $323K | 0.7% | 2025-Q3 stale |
| FNY Investment Advisers, LLC added | 50,000 | $314K | 0.7% | 2025-Q4 stale |
| SPHERA FUNDS MANAGEMENT LTD. trimmed | 58,539 | $268K | 0.6% | 2025-Q2 stale |
| Shay Capital LLC trimmed | 33,699 | $212K | 0.5% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 54,261 | $212K | 0.5% | 2025-Q3 stale |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P new | 25,000 | $157K | 0.4% | 2025-Q4 stale |
| GOLDMAN SACHS GROUP INC trimmed | 28,178 | $138K | 0.3% | 2025-Q1 stale |
| BLUEFIN CAPITAL MANAGEMENT, LLC new | 33,610 | $131K | 0.3% | 2025-Q3 stale |
| Woodline Partners LP trimmed | 25,555 | $125K | 0.3% | 2025-Q1 stale |
| Squarepoint Ops LLC trimmed | 20,299 | $99K | 0.2% | 2025-Q1 stale |
| Clear Harbor Asset Management, LLC new | 15,805 | $77K | 0.2% | 2025-Q1 stale |
| TWO SIGMA INVESTMENTS, LP trimmed | 11,312 | $71K | 0.2% | 2025-Q4 stale |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. new | 13,042 | $51K | 0.1% | 2025-Q3 stale |
| Global Retirement Partners, LLC | 1,000 | $6K | 0.0% | 2025-Q4 stale |
| BANK OF AMERICA CORP /DE/ added | 122 | $768 | 0.0% | 2025-Q4 stale |
| CIBC Private Wealth Group LLC | 100 | $629 | 0.0% | 2025-Q4 stale |
| OSAIC HOLDINGS, INC. added | 94 | $591 | 0.0% | 2025-Q4 stale |
| CITIGROUP INC | 51 | $199 | 0.0% | 2025-Q3 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale |
| SIMPLEX TRADING, LLC trimmed | 43 | — | 0.0% | 2025-Q2 stale |
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.