---
title: "CALCIUM BIDCO LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/000dfdfe-b153-5a5e-afbe-4d98111c0a9f
json: https://whiteintel.dev/api/public/dossier/000dfdfe-b153-5a5e-afbe-4d98111c0a9f
identifier: oo:GB-COH-16093668
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# CALCIUM BIDCO LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-16093668`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/000dfdfe-b153-5a5e-afbe-4d98111c0a9f  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/000dfdfe-b153-5a5e-afbe-4d98111c0a9f  

## Ownership & control

### Owners / controllers

- **CALCIUM MIDCO LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/ecff6e5f-769c-5cf6-bc8b-a3aae642a29f
- **CALCIUM MIDCO LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/ecff6e5f-769c-5cf6-bc8b-a3aae642a29f

### Holdings / subsidiaries

- **MATRIX TOPCO LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/9e949d56-fe40-5c68-bff7-af6b7c846a1d

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

A **2-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.

## Company profile (live · UK Companies House)

- **Company number:** `16093668`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2024-11-21
- **Registered office:** C/O Biocomposites Limited, Ic4 Keele Science Park, Keele, Newcastle, Staffordshire, ST5 5NL, England
- **SIC:** 64209

### Officers

- GREENHALGH, Simon George — director · British · appointed 2025-02-28
- HARRIS, Michael Christopher James — director · British · appointed 2025-02-28
- BAHNSEN, Birker Berthold — director · Danish · appointed 2024-11-21 · resigned 2025-02-28

### Beneficial owners (Persons with Significant Control)

- [Calcium Midco Limited](https://whiteintel.dev/entity/ecff6e5f-769c-5cf6-bc8b-a3aae642a29f) — 75–100% shares · corporate PSC · England — since 2024-11-21

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/16093668
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/16093668

## 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 **CALCIUM BIDCO LIMITED** — https://whiteintel.dev/entity/000dfdfe-b153-5a5e-afbe-4d98111c0a9f · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **CALCIUM BIDCO LIMITED**. Human view: https://whiteintel.dev/entity/000dfdfe-b153-5a5e-afbe-4d98111c0a9f · Structured JSON: https://whiteintel.dev/api/public/dossier/000dfdfe-b153-5a5e-afbe-4d98111c0a9f._

_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"._