Breakdown13F · 13D/G · Form 4
| Institutions58 holders · as of Mar 31, 2026 | 72.41% | 92.82M shares |
| Otherremainder | 27.59% | 35.37M shares |
128.19M company shares as of Aug 21, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing
The share count has not been confirmed by a second filing; stakes use it as it stands.
Top shareholders13F · 13D/G · Form 4
| Holder | Stake | Shares | Evidence |
|---|
Flagship Pioneering Inc.Institution | 48.89% | 62.67M | 13Fas of Mar 31, 2026 |
FMR LLCInstitution | 3.29% | 4.22M | 13Fas of Mar 31, 2026 |
Capital World InvestorsInstitution | 3.12% | 4.00M | 13Fas of Mar 31, 2026 |
Braidwell LPInstitution | 2.80% | 3.59M | 13Fas of Mar 31, 2026 |
JPMorgan Chase & CoInstitution | 2.30% | 2.95M | 13Fas of Mar 31, 2026 |
Price T Rowe Associates Inc /MD/Institution | 1.65% | 2.11M | 13Fas of Mar 31, 2026 |
Arch Venture Management, LLCInstitution | 1.52% | 1.94M | 13Fas of Mar 31, 2026 |
Harbourvest Partners LLCInstitution | 1.34% | 1.72M | 13Fas of Mar 31, 2026 |
Baker Bros. Advisors LPInstitution | 1.11% | 1.42M | 13Fas of Mar 31, 2026 |
Harvard Management Co IncInstitution | 0.87% | 1.11M | 13Fas of Mar 31, 2026 |
Nvidia CorpInstitution | 0.65% | 833,325 | 13Fas of Mar 31, 2026 |
Siren, L.L.C.Institution | 0.57% | 736,104 | 13Fas of Mar 31, 2026 |
Davern Capital Partners, LPInstitution | 0.46% | 591,800 | 13Fas of Mar 31, 2026 |
Alyeska Investment Group, L.P.Institution | 0.39% | 500,000 | 13Fas of Mar 31, 2026 |
Ark Investment Management LLCInstitution | 0.39% | 498,408 | 13Fas of Mar 31, 2026 |
Millennium Management LLCInstitution | 0.29% | 376,893 | 13Fas of Mar 31, 2026 |
UBS Group AGInstitution | 0.28% | 356,704 | 13Fas of Mar 31, 2026 |
Affinity Asset Advisors, LLCInstitution | 0.27% | 350,000 | 13Fas of Mar 31, 2026 |
Morgan StanleyInstitution | 0.26% | 337,302 | 13Fas of Mar 31, 2026 |
Exoduspoint Capital Management, LPInstitution | 0.24% | 311,986 | 13Fas of Mar 31, 2026 |
Centerbook Partners LPInstitution | 0.21% | 266,813 | 13Fas of Mar 31, 2026 |
Sphera Funds Management Ltd.Institution | 0.14% | 185,000 | 13Fas of Mar 31, 2026 |
Goldman Sachs Group IncInstitution | 0.13% | 170,695 | 13Fas of Mar 31, 2026 |
Vanguard Capital Management LLCInstitution | 0.10% | 131,319 | 13Fas of Mar 31, 2026 |
Seven Grand Managers, LLCInstitution | 0.10% | 125,000 | 13Fas of Mar 31, 2026 |
13F — a manager's quarterly holdings
Institutions13F, as of Mar 31, 2026
58 holders · 92.82M shares · 58 new positions · 58 increased · 0 reduced · 0 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|
| Flagship Pioneering Inc. | 62.67M | 48.89% | +62.67Mnew | May 15, 2026 |
| FMR LLC | 4.22M | 3.29% | +4.22Mnew | May 15, 2026 |
| Capital World Investors | 4.00M | 3.12% | +4.00Mnew | May 13, 2026 |
| Braidwell LP | 3.59M | 2.80% | +3.59Mnew | May 15, 2026 |
| JPMorgan Chase & Co | 2.95M | 2.30% | +2.95Mnew | May 13, 2026 |
| Price T Rowe Associates Inc /MD/ | 2.11M | 1.65% | +2.11Mnew | May 15, 2026 |
| Arch Venture Management, LLC | 1.94M | 1.52% | +1.94Mnew | May 15, 2026 |
| Harbourvest Partners LLC | 1.72M | 1.34% | +1.72Mnew | May 15, 2026 |
Ownership statements13D/G · 5% or more, as filed
No 13D/G filer at 5% or more on record.
Insider tradesForm 4
Latest trades
Nothing filed in the last 12 months.
CongressHouse and Senate disclosures
Not reported.
