---
title: "ONEIRONAUT LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/713fb184-e8ee-593f-a972-cfc5fff1c448
json: https://whiteintel.dev/api/public/dossier/713fb184-e8ee-593f-a972-cfc5fff1c448
identifier: oo:GB-COH-13298615
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# ONEIRONAUT LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-13298615`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/713fb184-e8ee-593f-a972-cfc5fff1c448  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/713fb184-e8ee-593f-a972-cfc5fff1c448  

## Ownership & control

### Owners / controllers

- **Mr Robert Sinior** (beneficial owner) — 50% — https://whiteintel.dev/entity/0ed78c1d-40d2-5a43-8a26-4bc97bdcddd7
- **Ms Malgorzata Akincza-Majchrzak** (beneficial owner) — 50% — https://whiteintel.dev/entity/edd3cb72-da4a-5b42-a137-018426bd79fa
- **Ms Malgorzata Akincza-Majchrzak** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/e70d2fa0-979f-426a-8d09-4016f8b63c46
- **Mr Robert Piotr Sinior** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/bcfe8c39-1c09-4ea3-81e3-348fd4d87cbb

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

A **4-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:** `13298615`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2021-03-29
- **Registered office:** 12 Cheshire Street, London, E2 6EH, England
- **SIC:** 47750

### Officers

- AKINCZA-MAJCHRZAK, Malgorzata — director · Polish · appointed 2021-03-29
- SINIOR, Robert Piotr — director · British · appointed 2021-03-29

### Beneficial owners (Persons with Significant Control)

- Mr Robert Piotr Sinior — 25–50% shares · individual PSC · England — since 2021-03-29
- Ms Malgorzata Akincza-Majchrzak — 25–50% shares · individual PSC · England — since 2021-03-29

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/13298615
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/13298615

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **ONEIRONAUT LIMITED**. Human view: https://whiteintel.dev/entity/713fb184-e8ee-593f-a972-cfc5fff1c448 · Structured JSON: https://whiteintel.dev/api/public/dossier/713fb184-e8ee-593f-a972-cfc5fff1c448._

_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"._