---
title: "FIRSTMARK HORIZON SPONSOR LLC — Ownership Dossier"
canonical: https://whiteintel.dev/entity/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f
json: https://whiteintel.dev/api/public/dossier/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f
identifier: sec:0001822220
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# FIRSTMARK HORIZON SPONSOR LLC

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001822220`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f  

## Ownership & control

### Holdings / subsidiaries

- **FIRSTMARK HORIZON ACQUISITION CORP.** (tenpercentowner) — https://whiteintel.dev/entity/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a
- **STARRY GROUP HOLDINGS, INC.** (tenpercentowner) — https://whiteintel.dev/entity/3d25bc46-5880-5e73-94c4-64b9c24acf31
- **FIRSTMARK HORIZON ACQUISITION CORP.** (director) — https://whiteintel.dev/entity/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a
- **STARRY GROUP HOLDINGS, INC.** (director) — https://whiteintel.dev/entity/3d25bc46-5880-5e73-94c4-64b9c24acf31

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **FIRSTMARK HORIZON SPONSOR LLC**. Human view: https://whiteintel.dev/entity/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f · Structured JSON: https://whiteintel.dev/api/public/dossier/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._