Private company
Flagship VentureLabs IV, LLC
American company, incorporated in Delaware. Summary from the record
Last updated Oct 21, 2026.
Overview
- HeadquartersDE1
Corporate structure
Flagship VentureLabs IV, LLC sits at the top of its group. 4 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.
- Flagship VentureLabs IV, LLC DE
- Axcella Health (United States) Stake · Cambridge
- Rubius Therapeutics (United States) Stake · Cambridge, Massachusetts, United States
- Seres Therapeutics, Inc. Stake · Cambridge, Massachusetts, United States
Built from major holders from Schedules 13D and 13G; stakes of 5% or more it reported on Schedules 13D and 13G (3 companies). Each entity in the chart links to its source.
Stakes it holds
Flagship VentureLabs IV, LLC has told the SEC it owns more than 5% of 3 companies, latest first (Schedules 13D and 13G).
- Rubius Therapeutics (United States)SC 13G/A Feb 14, 20232
- Axcella Health (United States)SC 13D/A Mar 18, 2022 to Oct 17, 20223
- Seres Therapeutics, Inc.SC 13D/A Jul 7, 20224
Sources
The numbers on this page point here. Each one links to the record it came from.
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