GENERATE BIOMEDICINES INC GENB
COM SHS · Common Stock · CUSIP 370920100
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersSomerville, MA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($644.4k this quarter). Holder counts are more reliable. Shares outstanding: 128.4m as of 2026-07-29, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $16.87.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q1 2026 | 57 |
| Q2 2026 | 86 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $0 | $0 | — |
| Q4 2025 | $0 | $0 | — |
| Q1 2026 | $157.1k | $0 | 0.00 |
| Q2 2026 | $0 | $0 | — |
Biggest buyers
| BlackRock, Inc. | New | +1.7m |
| Deep Track Capital, LP | New | +1.3m |
| FMR LLC | Added | +1.0m |
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +1.0m |
| ARK Investment Management LLC | Added | +786.2k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +616.8k |
| STATE STREET CORP | New | +526.6k |
| Davern Capital Partners, LP | Added | +232.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | New | +224.6k |
| Capital World Investors | Added | +211.5k |
Biggest sellers
| JPMORGAN CHASE & CO | Reduced | -1.5m |
| Alyeska Investment Group, L.P. | Sold out | -500.0k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -355.0k |
| ExodusPoint Capital Management, LP | Sold out | -312.0k |
| BRAIDWELL LP | Reduced | -309.2k |
| GOLDMAN SACHS GROUP INC | Reduced | -159.5k |
| CenterBook Partners LP | Reduced | -135.3k |
| JANE STREET GROUP, LLC | Sold out | -123.4k |
| SILVERARC CAPITAL MANAGEMENT, LLC | Sold out | -100.0k |
| D. E. Shaw & Co., Inc. | Sold out | -95.0k |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Flagship Pioneering, LLC 13G · exempt (held before listing) new · filed 2026-05-15 | 48.9% |
| Nally Michael 13G · exempt (held before listing) new · filed 2026-05-15 | 5.2% |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 5 | $75.3m | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 1 | $16.0k | $16.0k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-01 | ARNOLD FRANCES Director | Sold plan | $16.0k1.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Flagship Pioneering, LLC 68.66% of their portfolio | 62.7m $1.1bn | Unchanged |
| FMR LLC 0.00% of their portfolio | 5.2m $88.1m | Added +1.0m |
| Capital World Investors 0.01% of their portfolio | 4.2m $71.1m | Added +211.5k |
| BRAIDWELL LP 2.05% of their portfolio | 3.3m $55.4m | Reduced -309.2k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 2.2m $36.4m | Added +47.0k |
| NORGES BANK 0.00% of their portfolio | 2.1m $35.3m | Not comparable |
| ARCH Venture Management, LLC 2.98% of their portfolio | 1.9m $32.8m | Unchanged |
| HarbourVest Partners LLC 17.09% of their portfolio | 1.7m $29.1m | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 1.7m $28.0m | New |
| BAKER BROS. ADVISORS LP 0.12% of their portfolio | 1.4m $24.0m | Unchanged |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.4m $23.8m | Reduced -1.5m |
| Deep Track Capital, LP 0.33% of their portfolio | 1.3m $22.5m | New |
| ARK Investment Management LLC 0.14% of their portfolio | 1.3m $21.7m | Added +786.2k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.1m $19.1m | Added +1.0m |
| HARVARD MANAGEMENT CO INC 0.44% of their portfolio | 1.1m $18.7m | Unchanged |
| NVIDIA CORP 0.02% of their portfolio | 833.3k $14.1m | Unchanged |
| Davern Capital Partners, LP 2.37% of their portfolio | 824.7k $13.9m | Added +232.9k |
| Siren, L.L.C. 0.25% of their portfolio | 736.1k $12.4m | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 735.0k $12.4m | Added +616.8k |
| STATE STREET CORP 0.00% of their portfolio | 526.6k $8.9m | New |
| Affinity Asset Advisors, LLC 0.33% of their portfolio | 400.0k $6.7m | Added +50.0k |
| MORGAN STANLEY 0.00% of their portfolio | 378.0k $6.4m | Added +40.7k |
| UBS Group AG 0.00% of their portfolio | 326.3k $5.5m | Reduced -30.4k |
| SPHERA FUNDS MANAGEMENT LTD. 0.59% of their portfolio | 245.0k $4.1m | Added +60.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 224.6k $3.8m | New |
| NORTHERN TRUST CORP 0.00% of their portfolio | 197.5k $3.3m | New |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 175.4k $3.0m | Added +157.9k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 167.3k $2.8m | New |
| CenterBook Partners LP 0.11% of their portfolio | 131.6k $2.2m | Reduced -135.3k |
| ALPS ADVISORS INC 0.01% of their portfolio | 129.4k $2.2m | New |
| SEVEN GRAND MANAGERS, LLC 0.08% of their portfolio | 125.0k $2.1m | Unchanged |
| BARCLAYS PLC 0.00% of their portfolio | 116.9k $2.0m | Added +46.0k |
| LMR Partners LLP 0.01% of their portfolio | 100.0k $1.7m | Unchanged |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 91.1k $1.5m | Added +3.8k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 84.8k $1.4m | Added +10.5k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 57.3k $967.1k | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 55.4k $935.1k | Added +21.2k |
| TD Asset Management Inc 0.00% of their portfolio | 50.7k $856.1k | Added +7.9k |
| Nuveen, LLC 0.00% of their portfolio | 44.5k $750.2k | New |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 39.7k $669.5k | New |
| Sumitomo Mitsui Trust Group, Inc. 0.00% of their portfolio | 38.7k $652.3k | Reduced -1.7k |
| Amova Asset Management Americas, Inc. 0.01% of their portfolio | 38.2k $644.4k | Reduced -2.1k |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd 0.04% of their portfolio | 37.2k $628.0k | Added +18.0k |
| Quadrature Capital Ltd 0.00% of their portfolio | 31.5k $531.6k | New |
| Squarepoint Ops LLC 0.00% of their portfolio | 31.4k $529.8k | Reduced -5.8k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 30.6k $517.0k | New |
| CITIGROUP INC 0.00% of their portfolio | 30.6k $516.0k | Added +28.3k |
| Virtus Investment Advisers, LLC 0.10% of their portfolio | 26.4k $445.9k | New |
| XTX Topco Ltd 0.01% of their portfolio | 25.0k $421.0k | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 24.1k $407.2k | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 23.3k $393.1k | Added +22.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 22.6k $382.1k | New |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 21.9k $369.9k | Reduced -355.0k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 18.4k $310.0k | New |
| Magnus Financial Group LLC 0.02% of their portfolio | 15.6k $263.2k | New |
| MetLife Investment Management, LLC 0.00% of their portfolio | 14.8k $250.4k | New |
| Invesco Ltd. 0.00% of their portfolio | 13.1k $220.8k | New |
| AXQ CAPITAL, LP 0.02% of their portfolio | 12.9k $218.4k | New |
| SEI INVESTMENTS CO 0.00% of their portfolio | 12.1k $203.9k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 11.6k $196.1k | New |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 11.2k $188.8k | New |
| Parallel Advisors, LLC 0.00% of their portfolio | 11.2k $188.8k | Added +5.6k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 11.2k $188.7k | Reduced -159.5k |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 11.1k $187.1k | Added +9.9k |
| SG Americas Securities, LLC 0.00% of their portfolio | 9.3k $157.0k | New |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 8.6k $145.1k | New |
| Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio | 7.2k $121.5k | New |
| FEDERATED HERMES, INC. 0.00% of their portfolio | 5.0k $84.3k | Reduced -25.0k |
| ALBION FINANCIAL GROUP /UT 0.00% of their portfolio | 4.9k $81.9k | Unchanged |
| STRS OHIO 0.00% of their portfolio | 4.8k $81.0k | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 3.8k $64.1k | New |
| Legal & General Group Plc 0.00% of their portfolio | 2.4k $40.0k | New |
| Ameritas Investment Partners, Inc. 0.00% of their portfolio | 2.2k $37.4k | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 2.0k $32.9k | New |
| State of Wyoming 0.00% of their portfolio | 1.4k $23.7k | New |
| STANCE CAPITAL LLC 0.01% of their portfolio | 1.4k $23.3k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 1.4k $23.0k | Added +1.1k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 1.0k $17.1k | Added +1.0k |
| TD Waterhouse Canada Inc. 0.00% of their portfolio | 573 $9.5k | New |
| Benson Wealth Management INC 0.01% of their portfolio | 363 $6.1k | New |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 336 $5.7k | New |
| Sterling Capital Management LLC 0.00% of their portfolio | 212 $3.6k | New |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 200 $3.3k | New |
| Avion Wealth 0.00% of their portfolio | 200 $3.0k | Added +100 |
| HOLLENCREST CAPITAL MANAGEMENT 0.00% of their portfolio | 5 $84 | New |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 1 $17 | New |