---
title: "DIAMOND OFFSHORE LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/bbe5787d-a95b-582a-9302-c6769bbade4a
json: https://whiteintel.dev/api/public/dossier/bbe5787d-a95b-582a-9302-c6769bbade4a
identifier: oo:GB-COH-00943475
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# DIAMOND OFFSHORE LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-00943475`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/bbe5787d-a95b-582a-9302-c6769bbade4a  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/bbe5787d-a95b-582a-9302-c6769bbade4a  

## Ownership & control

### Owners / controllers

- **NOBLE OFFSHORE DRILLING (UK) LTD** (beneficial owner) — 100% — https://whiteintel.dev/entity/0ca9adbd-948d-51ff-a1c3-0c4753b97af2
- **Diamond Offshore Drilling Inc.** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/bf8e91b9-6829-493d-a8ea-028ab553cc57
- **Noble Offshore Drilling (Uk) Ltd** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/57605c6e-baa6-4b7d-85f5-f3cfbabdc801
- **NOBLE CORPORATION PLC** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/5e42d1b8-837e-5c7c-a597-44720a4430bb

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

A **24-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:** `00943475`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 1968-12-02
- **Registered office:** 3rd Floor 1 Ashley Road, Altrincham, Cheshire, WA14 2DT, United Kingdom
- **SIC:** 06100

### Officers

- COSGROVE, Carolyn Fiona — secretary · appointed 2024-11-25
- BOYLE, Bruce — director · British · appointed 2024-09-04
- COSGROVE, Carolyn Fiona — director · British · appointed 2024-09-04
- DUJACQUIER, David Michel Jacques — director · Belgian · appointed 2025-08-06
- DICKERSON, Lawrence Richard — secretary · American · appointed 1992-03-30 · resigned 1993-12-31
- LIONBERGER, Richard Lee — secretary · American · appointed 1993-09-30 · resigned 1998-06-22
- LIONBERGER, Richard Lee — secretary · American · resigned 1993-08-20
- LONG, William Charles — secretary · Usa · appointed 1999-12-06 · resigned 2003-01-04
- [DENTONS SECRETARIES LIMITED](https://whiteintel.dev/entity/cedcbfe9-3a9c-5a9a-946f-56587ec48ea3) — corporate secretary · appointed 2017-10-27 · resigned 2024-10-31
- EPS SECRETARIES LIMITED — corporate secretary · appointed 1993-08-20 · resigned 1999-12-31
- MACLAY MURRAY & SPENS LLP — corporate nominee secretary · appointed 1999-12-06 · resigned 2017-10-27
- BHAMRA, Sonia — director · British · appointed 2021-01-28 · resigned 2021-08-13
- DICKERSON, Lawrence Richard — director · American · resigned 2002-12-31
- ELWOOD, Stephen Glenn — director · American · appointed 2000-11-16 · resigned 2018-05-24
- HENDERSON, George Creighton Cole — director · British · appointed 2008-11-11 · resigned 2020-05-25
- JAMES, Ronald Leon — director · American · appointed 2002-12-31 · resigned 2004-05-01
- JOHNSON, Ronald Charles — director · American · resigned 1996-03-01
- KRENEK, Gary Thomas — director · American · appointed 1998-09-23 · resigned 1998-12-29
- LIONBERGER, Richard Lee — director · American · resigned 1998-06-22
- LONG, William Charles — director · American · appointed 2000-11-16 · resigned 2014-06-03

### Beneficial owners (Persons with Significant Control)

- [Noble Corporation Plc](https://whiteintel.dev/entity/5e42d1b8-837e-5c7c-a597-44720a4430bb) — 75–100% shares · corporate PSC · United Kingdom — since 2025-05-13
- [Noble Offshore Drilling (Uk) Ltd](https://whiteintel.dev/entity/57605c6e-baa6-4b7d-85f5-f3cfbabdc801) — 75–100% shares · corporate PSC · United Kingdom — ceased 2025-05-13
- [Diamond Offshore Drilling Inc](https://whiteintel.dev/entity/bf8e91b9-6829-493d-a8ea-028ab553cc57) — 75–100% shares · corporate PSC · United States — ceased 2024-02-07

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/00943475
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/00943475

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **DIAMOND OFFSHORE LIMITED**. Human view: https://whiteintel.dev/entity/bbe5787d-a95b-582a-9302-c6769bbade4a · Structured JSON: https://whiteintel.dev/api/public/dossier/bbe5787d-a95b-582a-9302-c6769bbade4a._

_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"._