---
title: "SIEGEL MARK S — Ownership Dossier"
canonical: https://whiteintel.dev/entity/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b
json: https://whiteintel.dev/api/public/dossier/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b
identifier: sec:0000919501
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# SIEGEL MARK S

**Type:** Person  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0000919501`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b  

## Ownership & control

### Holdings / subsidiaries

- **Fathom Holdings Inc.** (10% owner) — https://whiteintel.dev/entity/b8b7730b-ca1f-57e3-8eb3-3f0e18eacd0b
- **Fathom Holdings Inc.** (tenpercentowner) — https://whiteintel.dev/entity/b8b7730b-ca1f-57e3-8eb3-3f0e18eacd0b
- **PATTERSON UTI ENERGY INC** (director) — https://whiteintel.dev/entity/55fc3f41-fc1f-5d08-9d43-b61992f9721d
- **PATTERSON UTI ENERGY INC** (officer) — https://whiteintel.dev/entity/55fc3f41-fc1f-5d08-9d43-b61992f9721d

## Get the full, resolved dossier (agent-callable)

The above is the free teaser. The resolved **multi-hop UBO chain**, ownership **%**, full **financial history**, itemised **assets** and the hop-by-hop **exposure path** are the paid depth — callable as tools from your agent:

```bash
npx -y @whiteintel/mcp-server   # then: get_dossier · trace_ownership_path · check_offshore_exposure
```

Or unlock a one-off cited dossier for **SIEGEL MARK S** — https://whiteintel.dev/entity/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **SIEGEL MARK S**. Human view: https://whiteintel.dev/entity/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b · Structured JSON: https://whiteintel.dev/api/public/dossier/96d5d4a5-e6eb-5dde-954a-eb934a2fa62b._

_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"._