---
title: "DIAMOND TRANSMISSION PARTNERS RB (HOLDINGS) LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/e802fb1b-ce35-547e-8560-feb3cd4b3cf1
json: https://whiteintel.dev/api/public/dossier/e802fb1b-ce35-547e-8560-feb3cd4b3cf1
identifier: oo:GB-COH-10454309
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# DIAMOND TRANSMISSION PARTNERS RB (HOLDINGS) LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-10454309`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/e802fb1b-ce35-547e-8560-feb3cd4b3cf1  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/e802fb1b-ce35-547e-8560-feb3cd4b3cf1  

## Ownership & control

### Owners / controllers

- **DIAMOND TRANSMISSION CORPORATION LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/9eda51a6-8e50-5b68-9ecd-1a892809d3f3
- **DIAMOND TRANSMISSION UK LIMITED** (beneficial owner) — 75% — https://whiteintel.dev/entity/bc25db06-e2f3-5a4f-aa3e-f0b606d321e2
- **DIAMOND TRANSMISSION UK LIMITED** (beneficial owner) — 62.5% — https://whiteintel.dev/entity/bc25db06-e2f3-5a4f-aa3e-f0b606d321e2
- **DIAMOND TRANSMISSION CORPORATION LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/9eda51a6-8e50-5b68-9ecd-1a892809d3f3
- **INFRASTRUCTURE INVESTMENTS OFTO 1 LIMITED** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/8a86504d-45c5-5955-b6b0-feeb1e25aed0

### Holdings / subsidiaries

- **DIAMOND TRANSMISSION PARTNERS RB LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/41f0186d-1431-517f-8d5b-04bd87709e8b
- **DIAMOND TRANSMISSION PARTNERS RB LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/41f0186d-1431-517f-8d5b-04bd87709e8b

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

A **76-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:** `10454309`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2016-10-31
- **Registered office:** 71 Kingsway, London, WC2B 6ST, United Kingdom
- **SIC:** 35120

### Officers

- BESWETHERICK, Elizabeth Jo — director · British · appointed 2019-08-20
- DENG, Yandie — director · British · appointed 2025-07-30
- GWATINYANYA, Tawanda Soshangana — director · Zimbabwean · appointed 2026-04-17
- HEATH, James Christopher — director · British · appointed 2022-05-06
- FOOT, David Alexander John, Mr. — director · British · appointed 2019-08-20 · resigned 2022-05-06
- IHARA, Hiromasa — director · Japanese · appointed 2016-10-31 · resigned 2018-03-26
- LEE, Kwansoo — director · South Korean · appointed 2018-03-26 · resigned 2019-11-25
- PITTS, Matthew John — director · British · appointed 2019-11-25 · resigned 2025-07-30
- SHIMIZU, Satoshi — director · Japanese · appointed 2016-10-31 · resigned 2017-06-30
- THORNTON, Gary — director · British · appointed 2016-10-31 · resigned 2026-04-17
- UMEMURA, Yasushi — director · Japanese · appointed 2018-03-26 · resigned 2019-08-20

### Beneficial owners (Persons with Significant Control)

- [Diamond Transmission Uk Limited](https://whiteintel.dev/entity/bc25db06-e2f3-5a4f-aa3e-f0b606d321e2) — 50–75% shares · corporate PSC · England — since 2020-05-07
- [Infrastructure Investments Ofto 1 Limited](https://whiteintel.dev/entity/8a86504d-45c5-5955-b6b0-feeb1e25aed0) — 25–50% shares · corporate PSC · England — since 2019-08-21
- [Diamond Transmission Corporation Limited](https://whiteintel.dev/entity/9eda51a6-8e50-5b68-9ecd-1a892809d3f3) — 75–100% shares · corporate PSC · United Kingdom — ceased 2020-02-14

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/10454309
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/10454309

## 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 **DIAMOND TRANSMISSION PARTNERS RB (HOLDINGS) LIMITED** — https://whiteintel.dev/entity/e802fb1b-ce35-547e-8560-feb3cd4b3cf1 · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **DIAMOND TRANSMISSION PARTNERS RB (HOLDINGS) LIMITED**. Human view: https://whiteintel.dev/entity/e802fb1b-ce35-547e-8560-feb3cd4b3cf1 · Structured JSON: https://whiteintel.dev/api/public/dossier/e802fb1b-ce35-547e-8560-feb3cd4b3cf1._

_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"._