---
title: "401 CYBER SECURITY LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/d2b2a247-d897-5b91-960d-a1cb8e1da2fa
json: https://whiteintel.dev/api/public/dossier/d2b2a247-d897-5b91-960d-a1cb8e1da2fa
identifier: oo:GB-COH-09611788
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# 401 CYBER SECURITY LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-09611788`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/d2b2a247-d897-5b91-960d-a1cb8e1da2fa  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/d2b2a247-d897-5b91-960d-a1cb8e1da2fa  

## Ownership & control

### Owners / controllers

- **Mr Simon William Oldham** (beneficial owner) — 50% — https://whiteintel.dev/entity/c2874ddb-819d-5735-acbc-754771e61ed9
- **Mrs Katie Helen Oldham** (beneficial owner) — 50% — https://whiteintel.dev/entity/c3d674e1-381a-5a98-bc28-24432009cd80
- **Mr Simon William Oldham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/a13264b6-1c22-441b-bcd1-e40d2676afbf
- **Mrs Katie Helen Oldham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/c55674a1-d5bd-4e3f-bb66-15263cd95c84

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

1. **Mr Simon William Oldham** — beneficial owner 50% → *401 CYBER SECURITY LIMITED*
1. **Mrs Katie Helen Oldham** — beneficial owner 50% → *401 CYBER SECURITY LIMITED*
1. **Mr Simon William Oldham** — beneficial owner 37.5% → *401 CYBER SECURITY LIMITED*
1. **Mrs Katie Helen Oldham** — beneficial owner 37.5% → *401 CYBER SECURITY LIMITED*

## Company profile (live · UK Companies House)

- **Company number:** `09611788`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2015-05-28
- **Registered office:** Ground Floor, The Maltings, Locks Hill, Rochford, SS4 1BB, England
- **SIC:** 82990

### Officers

- OLDHAM, Simon William — secretary · appointed 2015-05-28
- OLDHAM, Katie Helen — director · British · appointed 2023-09-18
- OLDHAM, Simon William — director · British · appointed 2015-05-28

### Beneficial owners (Persons with Significant Control)

- Mrs Katie Helen Oldham — 25–50% shares · individual PSC · United Kingdom — since 2020-02-20
- Mr Simon William Oldham — 25–50% shares · individual PSC · England — since 2016-04-06

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/09611788
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/09611788

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **401 CYBER SECURITY LIMITED**. Human view: https://whiteintel.dev/entity/d2b2a247-d897-5b91-960d-a1cb8e1da2fa · Structured JSON: https://whiteintel.dev/api/public/dossier/d2b2a247-d897-5b91-960d-a1cb8e1da2fa._

_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"._