Private company
FirstMark Horizon Sponsor LLC
American company, incorporated in Delaware. Summary from the record
Last updated Oct 21, 2026.
Overview
- HeadquartersDE1
Corporate structure
FirstMark Horizon Sponsor LLC sits at the top of its group. 2 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.
- FirstMark Horizon Sponsor LLC DE
- Starry Group Holdings, Inc. Stake ยท Boston, Massachusetts
Built from major holders from Schedules 13D and 13G; stakes of 5% or more it reported on Schedules 13D and 13G (1 companies). Each entity in the chart links to its source.
Stakes it holds
FirstMark Horizon Sponsor LLC has told the SEC it owns more than 5% of 1 company, latest first (Schedules 13D and 13G).
- Starry Group Holdings, Inc.SC 13D Apr 14, 20222
Sources
The numbers on this page point here. Each one links to the record it came from.
- 1
- 2