Who owns Q32 Bio (QTTB)
Which tracked institutional funds hold QTTB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See QTTB 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 QTTB is one-sided between 2026-Q1 and 2026-Q2: 27 added or opened and 5 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
QTTB’s largest tracked holder by dollar value, ORBIMED ADVISORS LLC, sizes it at 1.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in QTTB 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 68 tracked filers holding QTTB, 43 increased or opened the position and 23 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 QTTB 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.
New buyers 9
- Boxer Capital Management, LLC$40M
- BVF INC/IL$30M
- RA CAPITAL MANAGEMENT, L.P.$30M
- Point72 Asset Management, L.P.$15M
- Logos Global Management LP$10M
- SummitTX Capital, L.P.$9M
Full exits 4
- ARCH Venture Management, LLC$2M
- MACKENZIE FINANCIAL CORP$2M
- ACADIAN ASSET MANAGEMENT LLC$1M
- Pfizer Inc$737K
Largest adds
- ORBIMED ADVISORS LLC$38M
- Atlas Venture Life Science Advisors, LLC$21M
- VANGUARD CAPITAL MANAGEMENT LLC$5M
- Opaleye Management Inc.$4M
- AMERICAN CENTURY COMPANIES INC$3M
- JANE STREET GROUP, LLC$2M
Largest trims
- Carlyle Group Inc.$6M
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 |
|---|---|---|---|---|
| ORBIMED ADVISORS LLC added | 4,127,987 | $53M | 18.3% | 2026-Q2 |
| Boxer Capital Management, LLC new | 3,149,310 | $40M | 14.0% | 2026-Q2 |
| Atlas Venture Life Science Advisors, LLC added | 2,717,106 | $35M | 12.0% | 2026-Q2 |
| BVF INC/IL new | 2,350,000 | $30M | 10.4% | 2026-Q2 |
| RA CAPITAL MANAGEMENT, L.P. new | 2,332,457 | $30M | 10.3% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 1,173,396 | $15M | 5.2% | 2026-Q2 |
| Opaleye Management Inc. trimmed | 931,000 | $12M | 4.1% | 2026-Q2 |
| Logos Global Management LP new | 800,000 | $10M | 3.5% | 2026-Q2 |
| SummitTX Capital, L.P. new | 733,774 | $9M | 3.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 518,803 | $7M | 2.3% | 2026-Q2 |
| Ikarian Capital, LLC new | 430,000 | $5M | 1.9% | 2026-Q2 |
| Woodline Partners LP added | 286,212 | $4M | 1.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 272,752 | $3M | 1.2% | 2026-Q2 |
| Sanofi | 244,083 | $3M | 1.1% | 2026-Q2 |
| ACORN CAPITAL ADVISORS, LLC trimmed | 216,171 | $3M | 1.0% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 179,600 | $2M | 0.8% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 162,747 | $2M | 0.7% | 2026-Q2 |
| MONIMUS CAPITAL MANAGEMENT, LP trimmed | 132,036 | $2M | 0.6% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC new | 130,427 | $2M | 0.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 122,690 | $2M | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 120,663 | $2M | 0.5% | 2026-Q2 |
| BlackRock, Inc. added | 118,507 | $2M | 0.5% | 2026-Q2 |
| MARSHALL WACE, LLP added | 67,045 | $854K | 0.3% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 66,217 | $844K | 0.3% | 2026-Q2 |
| Carlyle Group Inc. trimmed | 60,363 | $769K | 0.3% | 2026-Q2 |
| STATE STREET CORP added | 52,214 | $665K | 0.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 49,582 | $632K | 0.2% | 2026-Q2 |
| Quadrature Capital Ltd new | 36,396 | $464K | 0.2% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 34,613 | $441K | 0.2% | 2026-Q2 |
| DAFNA Capital Management LLC new | 32,896 | $419K | 0.1% | 2026-Q2 |
| Knott David M Jr new | 30,412 | $387K | 0.1% | 2026-Q2 |
| Affinity Asset Advisors, LLC | 27,777 | $354K | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC added | 23,790 | $303K | 0.1% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 23,631 | $301K | 0.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP new | 23,588 | $301K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 23,342 | $297K | 0.1% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC new | 22,150 | $282K | 0.1% | 2026-Q2 |
| LPL Financial LLC new | 18,170 | $231K | 0.1% | 2026-Q2 |
| UBS Group AG added | 15,008 | $191K | 0.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. new | 12,342 | $157K | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP new | 11,336 | $144K | 0.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 10,928 | $139K | 0.0% | 2026-Q2 |
| XTX Topco Ltd trimmed | 10,874 | $139K | 0.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 6,456 | $82K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 4,824 | $61K | 0.0% | 2026-Q2 |
| FMR LLC trimmed | 3,388 | $43K | 0.0% | 2026-Q2 |
| CITIGROUP INC added | 2,888 | $37K | 0.0% | 2026-Q2 |
| Private Wealth Asset Management, LLC new | 1,700 | $22K | 0.0% | 2026-Q2 |
| Arax Advisory Partners trimmed | 1,111 | $14K | 0.0% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 1,050 | $13K | 0.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. | 577 | $7K | 0.0% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP | 500 | $7K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. | 454 | $6K | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 303 | $4K | 0.0% | 2026-Q2 |
| EverSource Wealth Advisors, LLC trimmed | 240 | $3K | 0.0% | 2026-Q2 |
| NISA INVESTMENT ADVISORS, LLC | 166 | $2K | 0.0% | 2026-Q2 |
| Truvestments Capital LLC new | 162 | $2K | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. | 124 | $2K | 0.0% | 2026-Q2 |
| Allworth Financial LP added | 108 | $1K | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. trimmed | 94 | $1K | 0.0% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec | 70 | $888 | 0.0% | 2026-Q2 |
| Clearstead Advisors, LLC new | 67 | $854 | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd added | 45 | $573 | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC | 34 | $433 | 0.0% | 2026-Q2 |
| HARBOUR INVESTMENTS, INC. | 11 | $140 | 0.0% | 2026-Q2 |
| AdvisorNet Financial, Inc | 2 | $25 | 0.0% | 2026-Q2 |
| DANSKE BANK A/S | 1 | $13 | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 43 | — | 0.0% | 2026-Q2 |
| ARCH Venture Management, LLC | 320,482 | $2M | 0.7% | 2026-Q1 stale (1 quarter behind) |
| MACKENZIE FINANCIAL CORP new | 246,304 | $2M | 0.6% | 2026-Q1 stale (1 quarter behind) |
| ACADIAN ASSET MANAGEMENT LLC added | 172,586 | $1M | 0.4% | 2026-Q1 stale (1 quarter behind) |
| Pfizer Inc trimmed | 101,618 | $737K | 0.3% | 2026-Q1 stale (1 quarter behind) |
| Cambridge Investment Research Advisors, Inc. new | 35,025 | $225K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| ADAR1 Capital Management, LLC added | 35,000 | $225K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Cetera Investment Advisers new | 20,695 | $133K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Tower Research Capital LLC (TRC) added | 1,871 | $12K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 111 | $713 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| WELLS FARGO & COMPANY/MN trimmed | 84 | $539 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| CWM, LLC trimmed | 39 | $250 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| VANGUARD GROUP INC added | 321,051 | $1M | 0.4% | 2025-Q4 stale (2 quarters behind) |
| Monaco Asset Management SAM trimmed | 50,919 | $169K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| HRT FINANCIAL LP added | 24,698 | $81K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Scientech Research LLC new | 15,510 | $51K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Global Retirement Partners, LLC trimmed | 1,500 | $5K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| BANK OF AMERICA CORP /DE/ trimmed | 1,035 | $3K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| JPMORGAN CHASE & CO added | 324 | $1K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Trustees of Columbia University in the City of New York | 133,903 | $265K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| TWO SIGMA SECURITIES, LLC new | 13,749 | $27K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| DLK Investment Management, LLC | 10,333 | $20K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| China Universal Asset Management Co., Ltd. trimmed | 2,138 | $4K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Mirae Asset Global Investments Co., Ltd. added | 472 | $935 | 0.0% | 2025-Q3 stale (3 quarters behind) |
| GF FUND MANAGEMENT CO. LTD. trimmed | 227 | $449 | 0.0% | 2025-Q3 stale (3 quarters behind) |
| GOLDMAN SACHS GROUP INC added | 63,539 | $95K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| AQR CAPITAL MANAGEMENT LLC trimmed | 26,530 | $40K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| OPPENHEIMER & CO INC new | 13,000 | $19K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Mariner, LLC trimmed | 11,780 | $18K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| RAYMOND JAMES FINANCIAL INC | 10,746 | $16K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| SIMPLEX TRADING, LLC new | 813 | $1K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Clark Wealth Partners | 199 | $297 | 0.0% | 2025-Q2 stale (4 quarters behind) |
| True Wealth Design, LLC added | 67 | $100 | 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.