---
title: "HEPPERMANN DONALD C — Ownership Dossier"
canonical: https://whiteintel.dev/entity/1cdb34d8-be07-5ccc-894a-e9aaf83f645c
json: https://whiteintel.dev/api/public/dossier/1cdb34d8-be07-5ccc-894a-e9aaf83f645c
identifier: sec:0001235073
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# HEPPERMANN DONALD C

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001235073`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/1cdb34d8-be07-5ccc-894a-e9aaf83f645c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/1cdb34d8-be07-5ccc-894a-e9aaf83f645c  

## Ownership & control

### Holdings / subsidiaries

- **MARKWEST HYDROCARBON INC** (director) — https://whiteintel.dev/entity/5eb6e16d-e294-5ca9-ab66-a1b7d95b7de6
- **MARKWEST ENERGY PARTNERS L P** (director) — https://whiteintel.dev/entity/f328b9af-54e6-50ba-ab36-44b00f6a94f2

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **HEPPERMANN DONALD C**. Human view: https://whiteintel.dev/entity/1cdb34d8-be07-5ccc-894a-e9aaf83f645c · Structured JSON: https://whiteintel.dev/api/public/dossier/1cdb34d8-be07-5ccc-894a-e9aaf83f645c._

_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"._