---
title: "Siena Holding OÜ — Ownership Dossier"
canonical: https://whiteintel.dev/entity/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e
json: https://whiteintel.dev/api/public/dossier/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e
identifier: ee-regcode:12658992
jurisdiction: EE
source: WhiteIntel corporate-ownership graph
---

# Siena Holding OÜ

**Type:** Company  
**Jurisdiction:** EE  
**Identifier:** `ee-regcode:12658992`  
**Canonical dossier:** https://whiteintel.dev/entity/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e  

## Registry profile

- **Status:** Registrisse kantud  
- **Legal form:** `Osaühing`  
- **Source:** Estonian e-Business Register (RIK)  

## Ownership & control

### Owners / controllers

- **Heikki Källu** (beneficial owner) — https://whiteintel.dev/entity/b9bf336e-8d79-5049-bc6a-328edec77a68
- **Lauri Isotamm** (beneficial owner) — https://whiteintel.dev/entity/ed83cf33-fc98-5b83-a534-26868e66918a
- **Rain Tamm** (beneficial owner) — https://whiteintel.dev/entity/489aef56-461f-51c0-af78-78b31acf58c5

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

A **5-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.

## Provenance

- estonia_ariregister — https://ariregister.rik.ee/est/company/12658992

## 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 **Siena Holding OÜ** — https://whiteintel.dev/entity/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Siena Holding OÜ**. Human view: https://whiteintel.dev/entity/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e · Structured JSON: https://whiteintel.dev/api/public/dossier/ff4fe2ea-bba0-547c-8ff9-9b8dc3c49f3e._

_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"._