---
title: "JEFFERY SINJON AND ASSOCIATES LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/ea949e59-689f-5367-86c4-71e6df5a8a74
json: https://whiteintel.dev/api/public/dossier/ea949e59-689f-5367-86c4-71e6df5a8a74
identifier: oo:GB-COH-01338911
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# JEFFERY SINJON AND ASSOCIATES LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-01338911`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/ea949e59-689f-5367-86c4-71e6df5a8a74  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/ea949e59-689f-5367-86c4-71e6df5a8a74  

## Ownership & control

### Owners / controllers

- **Mr Martyn Hugh Jeffery** (beneficial owner) — 75% — https://whiteintel.dev/entity/e5018882-fba3-5683-a432-05f896c6d857
- **Mr Martyn Hugh Jeffery** (beneficial owner) — 62.5% — https://whiteintel.dev/entity/9cf8f8d0-3a96-4427-9877-635d6574a77a

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

1. **Mr Martyn Hugh Jeffery** — beneficial owner 75% → *JEFFERY SINJON AND ASSOCIATES LIMITED*
1. **Mr Martyn Hugh Jeffery** — beneficial owner 62.5% → *JEFFERY SINJON AND ASSOCIATES LIMITED*

## Company profile (live · UK Companies House)

- **Company number:** `01338911`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 1977-11-15
- **Registered office:** Merton Barn 25 The Broadway, Grantchester, Cambridge, CB3 9NQ
- **SIC:** 47990

### Officers

- JEFFERY, Martyn Hugh — secretary · British · appointed 2004-09-10
- JEFFERY, Alice Micheline — director · British · appointed 2003-03-31
- JEFERY, Peter Francis — secretary · British · appointed 2003-03-31 · resigned 2004-09-10
- JEFFERY, Alice Micheline — secretary · British · appointed 1998-07-01 · resigned 2003-03-22
- JEFFERY, Peter — secretary · British · resigned 1998-07-01
- JEFFERY, Martyn Hugh — director · British · resigned 2003-03-31

### Beneficial owners (Persons with Significant Control)

- Mr Martyn Hugh Jeffery — 50–75% shares · individual PSC — since 2016-06-01

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/01338911
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/01338911

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **JEFFERY SINJON AND ASSOCIATES LIMITED**. Human view: https://whiteintel.dev/entity/ea949e59-689f-5367-86c4-71e6df5a8a74 · Structured JSON: https://whiteintel.dev/api/public/dossier/ea949e59-689f-5367-86c4-71e6df5a8a74._

_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"._