Who owns GENB (GENB)
Which tracked institutional funds hold GENB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GENB 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.
Conviction spread
GENB’s largest tracked holder by dollar value, Flagship Pioneering, LLC, sizes it at 67.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 67.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in GENB 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
Only one quarter (2026-Q1) of 13F history is available — a quarter-over-quarter accumulation delta needs two.
We do not publish a positioning read for a window we cannot measure honestly. A starting question, not a verdict.
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.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Flagship Pioneering, LLC new | 62,673,117 | $783M | 67.7% | 2026-Q1 |
| FMR LLC new | 4,217,524 | $53M | 4.6% | 2026-Q1 |
| Capital World Investors new | 4,004,149 | $50M | 4.3% | 2026-Q1 |
| BRAIDWELL LP new | 3,592,999 | $45M | 3.9% | 2026-Q1 |
| JPMORGAN CHASE & CO new | 2,947,259 | $34M | 2.9% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ new | 2,109,633 | $26M | 2.3% | 2026-Q1 |
| ARCH Venture Management, LLC new | 1,944,426 | $24M | 2.1% | 2026-Q1 |
| HarbourVest Partners LLC new | 1,722,210 | $22M | 1.9% | 2026-Q1 |
| BAKER BROS. ADVISORS LP new | 1,423,602 | $18M | 1.5% | 2026-Q1 |
| HARVARD MANAGEMENT CO INC new | 1,111,100 | $14M | 1.2% | 2026-Q1 |
| NVIDIA CORP new | 833,325 | $10M | 0.9% | 2026-Q1 |
| Siren, L.L.C. new | 736,104 | $9M | 0.8% | 2026-Q1 |
| Davern Capital Partners, LP new | 591,800 | $7M | 0.6% | 2026-Q1 |
| Alyeska Investment Group, L.P. new | 500,000 | $6M | 0.5% | 2026-Q1 |
| ARK Investment Management LLC new | 498,408 | $6M | 0.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC new | 376,893 | $5M | 0.4% | 2026-Q1 |
| UBS Group AG new | 356,704 | $4M | 0.4% | 2026-Q1 |
| Affinity Asset Advisors, LLC new | 350,000 | $4M | 0.4% | 2026-Q1 |
| MORGAN STANLEY new | 337,302 | $4M | 0.4% | 2026-Q1 |
| ExodusPoint Capital Management, LP new | 311,986 | $4M | 0.3% | 2026-Q1 |
| CenterBook Partners LP new | 266,813 | $3M | 0.3% | 2026-Q1 |
| SPHERA FUNDS MANAGEMENT LTD. new | 185,000 | $2M | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC new | 170,695 | $2M | 0.2% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 131,319 | $2M | 0.1% | 2026-Q1 |
| SEVEN GRAND MANAGERS, LLC new | 125,000 | $2M | 0.1% | 2026-Q1 |
| JANE STREET GROUP, LLC new | 123,371 | $2M | 0.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC new | 118,243 | $1M | 0.1% | 2026-Q1 |
| SILVERARC CAPITAL MANAGEMENT, LLC new | 100,000 | $1M | 0.1% | 2026-Q1 |
| LMR Partners LLP new | 100,000 | $1M | 0.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. new | 95,000 | $1M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC new | 87,335 | $1M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. new | 79,489 | $994K | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE new | 74,312 | $929K | 0.1% | 2026-Q1 |
| BARCLAYS PLC new | 70,894 | $886K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP new | 58,762 | $734K | 0.1% | 2026-Q1 |
| Qube Research & Technologies Ltd new | 50,221 | $628K | 0.1% | 2026-Q1 |
| TD Asset Management Inc new | 42,866 | $536K | 0.0% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. new | 40,344 | $504K | 0.0% | 2026-Q1 |
| Amova Asset Management Americas, Inc. new | 40,344 | $499K | 0.0% | 2026-Q1 |
| Squarepoint Ops LLC new | 37,203 | $465K | 0.0% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ new | 34,196 | $427K | 0.0% | 2026-Q1 |
| FEDERATED HERMES, INC. new | 30,000 | $375K | 0.0% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL new | 23,833 | $298K | 0.0% | 2026-Q1 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd new | 19,203 | $240K | 0.0% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd new | 18,362 | $230K | 0.0% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 17,456 | $218K | 0.0% | 2026-Q1 |
| Hudson Bay Capital Management LP new | 16,678 | $208K | 0.0% | 2026-Q1 |
| Diametric Capital, LP new | 10,497 | $131K | 0.0% | 2026-Q1 |
| Parallel Advisors, LLC new | 5,550 | $69K | 0.0% | 2026-Q1 |
| ALBION FINANCIAL GROUP /UT new | 4,854 | $61K | 0.0% | 2026-Q1 |
| FNY Investment Advisers, LLC new | 3,000 | $37K | 0.0% | 2026-Q1 |
| CITIGROUP INC new | 2,244 | $28K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 1,225 | $15K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN new | 1,200 | $15K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA new | 231 | $3K | 0.0% | 2026-Q1 |
| Avion Wealth new | 100 | $1K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) new | 1 | $12 | 0.0% | 2026-Q1 |
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.