---
title: "FIRSTMARK HORIZON ACQUISITION CORP. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a
json: https://whiteintel.dev/api/public/dossier/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a
identifier: sec:0001822219
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# FIRSTMARK HORIZON ACQUISITION CORP.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001822219`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a  

## Ownership & control

### Owners / controllers

- **HEITZMANN RICHARD R** (tenpercentowner) — https://whiteintel.dev/entity/f3e7f680-232f-5f77-8035-8f2e4b6aa3ab
- **JANI AMISH A** (tenpercentowner) — https://whiteintel.dev/entity/a7e43f8e-27db-5fba-bc52-dd0620554ba6
- **FIRSTMARK HORIZON SPONSOR LLC** (tenpercentowner) — https://whiteintel.dev/entity/efeb8fa5-8071-5809-b9fc-a2973e6f6c4f

### UBO chain (walk to the ultimate owner)

A **14-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **FIRSTMARK HORIZON ACQUISITION CORP.**. Human view: https://whiteintel.dev/entity/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a · Structured JSON: https://whiteintel.dev/api/public/dossier/33a6d95d-6f36-5fee-bd5a-cd6b8b1cb71a._

_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"._