---
title: "Calvert Mark Sewell — Ownership Dossier"
canonical: https://whiteintel.dev/entity/29d97325-e731-4baa-8983-6d391524c8dc
json: https://whiteintel.dev/api/public/dossier/29d97325-e731-4baa-8983-6d391524c8dc
identifier: psc:mkBPpEBY39SMgzB1rOH2-lX-26A
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Calvert Mark Sewell

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `psc:mkBPpEBY39SMgzB1rOH2-lX-26A`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/29d97325-e731-4baa-8983-6d391524c8dc  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/29d97325-e731-4baa-8983-6d391524c8dc  

## Ownership & control

### Holdings / subsidiaries

- **MARK CSIT LTD** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/41e9d9e9-4b98-59b0-a9d0-2aa7ab4bdcf6

## 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 **Calvert Mark Sewell** — https://whiteintel.dev/entity/29d97325-e731-4baa-8983-6d391524c8dc · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Calvert Mark Sewell**. Human view: https://whiteintel.dev/entity/29d97325-e731-4baa-8983-6d391524c8dc · Structured JSON: https://whiteintel.dev/api/public/dossier/29d97325-e731-4baa-8983-6d391524c8dc._

_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"._