Insider holders · CIK 0001661998
Q32 Bio Inc. · QTTB
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| ARCH Venture Fund VIII Overage, L.P.10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| ARCH Venture Partners VIII, L.P.10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| ARCH Venture Partners VIII, LLC10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| ARCH Venture Fund VIII, L.P.10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| Steven GillisDirector | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:27 pm EDT | Form 4 |
| Clinton Bybee10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| Robert Nelsen10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| Keith Crandell10% Owner | — | 6,068,695 | 6,068,695 | Apr 4, 2018 · 4:25 pm EDT | Form 4 |
| TLS Beta Pte. Ltd.10% Owner | — | 3,220,293 | 3,220,293 | Apr 4, 2018 · 1:33 pm EDT | Form 4 |
| V-Sciences Investments Pte Ltd10% Owner | — | 3,220,293 | 3,220,293 | Apr 4, 2018 · 1:33 pm EDT | Form 4 |
| Temasek Life Sciences Private Ltd10% Owner | — | 3,220,293 | 3,220,293 | Apr 4, 2018 · 1:33 pm EDT | Form 4 |
| Fullerton Management Pte Ltd10% Owner | — | 3,220,293 | 3,220,293 | Apr 4, 2018 · 1:33 pm EDT | Form 4 |
| Temasek Holdings (Private) Ltd10% Owner | — | 3,220,293 | 3,220,293 | Apr 4, 2018 · 1:33 pm EDT | Form 4 |
| Novartis Institutes for BioMedical Research, Inc.10% Owner | 1,979,226 | — | 1,979,226 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| NOVARTIS AG10% Owner | 1,979,226 | — | 1,979,226 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Mahendra ShahDirector | — | 909,742 | 909,742 | May 16, 2018 · 4:05 pm EDT | Form 4/A |
| VV Manager LLC10% Owner | — | 770,845 | 770,845 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Vida Ventures, LLC10% Owner | — | 770,845 | 770,845 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Rock Springs Capital LLC10% Owner | — | 645,845 | 645,845 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Rock Springs Capital Master Fund LP10% Owner | — | 645,845 | 645,845 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Rock Springs Capital Management LP10% Owner | — | 645,845 | 645,845 | Apr 4, 2018 · 4:24 pm EDT | Form 4 |
| Atlas Venture Associates Opportunity III, LLCrelationship not stated | 625,000 | — | 625,000 | Jun 8, 2026 · 4:30 pm EDT | Form 3 |
| Atlas Venture Associates Opportunity III, L.P.relationship not stated | 625,000 | — | 625,000 | Jun 8, 2026 · 4:30 pm EDT | Form 3 |
| Atlas Venture Opportunity Fund Ill, L.P.relationship not stated | 625,000 | — | 625,000 | Jun 8, 2026 · 4:30 pm EDT | Form 3 |
| Deerfield Mgmt HIF, L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| Deerfield Healthcare Innovations Fund, L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| Deerfield Mgmt III, L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| Deerfield Private Design Fund III, L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| James E FlynnDirector | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| DEERFIELD PARTNERS, L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| Deerfield Mgmt L.P.Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C)Director | — | 625,000 | 625,000 | Apr 4, 2018 · 8:56 pm EDT | Form 4 |
| Saswati Chatterjee10% Owner | 475,014 | — | 475,014 | Mar 27, 2018 · 6:02 pm EDT | Form 3 |
| Jodie Pope MorrisonCEO | 343,259 | — | 343,259 | Aug 27, 2026 · 4:10 pm EDT | Form 4 |
| Kush ParmarDirector | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| Andrew J. Schwab10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| 5AM Co-Investors IV, L.P.10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| 5AM Ventures IV, L.P.10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| 5AM Partners IV, LLC10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| John D Diekman10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| Scott M Rocklage10% Owner | — | 246,035 | 246,035 | Dec 12, 2018 · 8:10 pm EST | Form 4 |
| Siyamak RastyChief Operating Officer | 238,707 | — | 238,707 | Mar 27, 2018 · 5:53 pm EDT | Form 3 |
| Albert SeymourChief Scientific Officer | 228,250 | — | 228,250 | Mar 27, 2018 · 5:54 pm EDT | Form 3 |
| Arthur TzianabosPresident & CEO | 190,005 | — | 190,005 | Mar 27, 2018 · 5:50 pm EDT | Form 3 |
| Shelia M. VioletteChief Scientific Officer | 127,771 | 36,277 | 164,048 | Aug 27, 2026 · 4:10 pm EDT | Form 4 |
| Lee KalowskiCFO and President | 138,471 | — | 138,471 | Aug 27, 2026 · 4:10 pm EDT | Form 4 |
| Isaac MankeDirector | 53,521 | — | 53,521 | Jul 2, 2026 · 4:30 pm EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.