Company · Ownership research

Generate Biomedicines, Inc. GENB

CIK 0002100782

Form 3 statements with an event date from Nov 1, 2023 to Nov 15, 2026.

Insider tradingInitial holdingsInstitutional holders

Some filings are submitted jointly by several insiders. The SEC form does not apportion the reported figures between them, so results include every joint filer.

Where insider ownership starts.

Form 3 is an initial ownership statement filed when someone becomes a reporting insider. These holdings do not mean they bought shares that day.

202617 of 17 statements

Holdings date	Insider	Initial holdings
Mar 2, 2026	Pioneering Medicines 02, LLC 10% owner	1.56M shares	▾
Feb 26, 2026	AFEYAN NOUBAR · Flagship Pioneering, LLC · Flagship Pioneering Fund VI General Partner LLC · Nutritional Health LTP Fund General Partner LLC · Flagship Pioneering Fund VII General Partner LLC · Flagship Pioneering Special Opportunities Fund II General Partner LLC · FPN General Partner LLC · Flagship VentureLabs VI Manager LLC Director · 10% owner / 10% owner / 10% owner / 10% owner / 10% owner / 10% owner / 10% owner / 10% owner	25.02M shares · 12 derivative holdings	▾
Feb 26, 2026	AFEYAN NOUBAR · Flagship Pioneering Fund VI, L.P. · Flagship VentureLabs VI LLC · Flagship Pioneering Special Opportunities Fund II, L.P. · Nutritional Health LTP Fund, L.P. · Flagship Pioneering Fund VII, L.P. · FPN II, L.P. Director · 10% owner / 10% owner / 10% owner / 10% owner / 10% owner / 10% owner / 10% owner	25.02M shares · 12 derivative holdings	▾
Feb 26, 2026	Nally Michael Chief Executive Officer · Director	3 stock holdings · 7 derivative holdings	▾
Feb 26, 2026	Martin Sean Chief Legal Officer & GC	3 derivative holdings	▾
Feb 26, 2026	Silvers Jason President & CFO	3 derivative holdings	▾
Feb 26, 2026	Parker Paul Gray Director	1 derivative holding	▾
Feb 26, 2026	Simonian Nancy A Director	1 derivative holding	▾
Feb 26, 2026	Mendillo Jane L Director	2 derivative holdings	▾
Feb 26, 2026	Lee Laurie Anne Chief Medical Officer	1 derivative holding	▾
Feb 26, 2026	Grigoryan Gevorg Chief Technology Officer	659.97K shares · 4 derivative holdings	▾
Feb 26, 2026	Grous Beth Chief People Officer	2 derivative holdings	▾
Feb 26, 2026	Bancel Stephane Director	460.83K shares · 4 derivative holdings	▾
Feb 26, 2026	Vessey Rupert Director	1 derivative holding	▾
Feb 26, 2026	Khakoo Aarif Chief Scientific Officer	1 derivative holding	▾
Feb 26, 2026	ARNOLD FRANCES Director	2 stock holdings · 3 derivative holdings	▾
Feb 26, 2026	Fanucci Marsha Director	1 derivative holding	▾

Showing 17 / 17 statements in 2026. The complete set is available through the API.

Generate Biomedicines, Inc. · GENB

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.