Company · London
Altnet Partners Holdco Limited
Activities of other holding companies n.e.c.
Official record Companies House · updated 27th September 2026 · Sources
Network
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Who leads it
Previous officers 4
- Martin David Graham 2025-2025 View profile
- Josef Mattar 2025-2026 View profile
- Matthew William Edward Hare 2025-2025 View profile
- Kulvinder Plahay 2024-2025 View profile
Directors and secretaries as filed at Companies House.
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About
- What it does
- Activities of other holding companies n.e.c.
- Incorporated
- 18/12/2024
- Registered office
- London
Ownership
Owned by (2) iOwned byIndividuals and companies registered as having significant control over this company, from the Companies House PSC (persons with significant control) register. People whose ownership could not be confirmed to one individual are not listed as confirmed owners.
- Iris Infra Holdco Limited
50-75% shares, 50-75% voting, appoints directors · notified 2024-12-18 - ZGL Investment Limited
25-50% shares, 25-50% voting, appoints directors (firm) · notified 2025-03-07
Group
- Altnet Partners Holdco Limited
is controlled by Iris Infra Holdco Limited
Evidence
active 50-75% shares, 50-75% voting, appoints directors · notified 2024-12-18 · source: Companies House PSC register - Iris Infra Holdco Limited
is controlled by Iris Infra Master Holdco Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2020-12-01 · source: Companies House PSC register - Iris Infra Master Holdco Limited
is controlled by Iris Holdco Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2020-12-01 · source: Companies House PSC register - Iris Holdco Limited
is controlled by Iris Master Holdco Limited
Evidence
active 75-100% shares, 75-100% voting, appoints directors · notified 2020-12-01 · source: Companies House PSC register - Iris Master Holdco Limited
is controlled by Basalt Infrastructure Partners LLP
Evidence
active significant influence · notified 2020-12-01 · source: Companies House PSC register - Basalt Infrastructure Partners LLP
is controlled by Robert John Gregor
Evidence
active significant influence (LLP) · notified 2016-06-30 · source: Companies House PSC register
Ultimately controlled by Robert John Gregor.
29 other companies in this group
- Caelus Bidco LTD
- Iris Master Holdco Limited
- Caelus Midco LTD
- Beach UK Holdco Limited
- Basalt Infrastructure Partners LLP
- Iris Holdco Limited
- Basalt Infrastructure Partners II (UK) 1 Limited
- Basalt Infrastructure Partners II GP 2 LLP
- Arca Shipping Limited
- Basalt Founder Partner L.P.
- Frigg Holdco LTD
- Arca Bidco Limited
- Altnet Partners Limited
- Biosphere Topco Limited
- Mosselen Holdco Limited
- Basalt Infrastructure Partners GP 2 LLP
- Cannoli L.P.
- Wightlink Limited
- Arca Topco Limited
- Iris Infra Master Holdco Limited
- Arca Holdco Limited
- Iris Infra Holdco Limited
- SC571885
- Basalt Infrastructure Partners II (UK) 2 Limited
- Arca Midco Limited
- 14785211
- Freyja Holdco LTD
- Long Reef Holdco Limited
- Caelus Topco LTD
Ownership paths are calculated from Companies House persons-with-significant-control filings. Each step shows the filed nature of control and dates; a step marked "ceased" is historical, not current.
Board analysis
Board DNA
How this board is put together, from the Companies House officer record and Charity Commission trustee records - deterministic, no AI.iBoard compositionCounted from the dated Companies House officer record: the current directors only, past directors excluded.
6 directors on the board
- Mariana Barrientos Ossio Director · appointed 2024
- James Stephen Warner Director · appointed 2025
- Mario Adario Director · appointed 2026
- Steven Lowry Director · appointed 2024
- Paul Doyle Director · appointed 2025
- Matteo Renzi Director · appointed 2025
First-time vs portfolio directors
Portfolio (6)
- Mariana Barrientos Ossio Director · appointed 2024
- James Stephen Warner Director · appointed 2025
- Mario Adario Director · appointed 2026
- Steven Lowry Director · appointed 2024
- Paul Doyle Director · appointed 2025
- Matteo Renzi Director · appointed 2025
Left in the last 12 months
- Martin David Graham Director · appointed 2025 · resigned 2025
- Josef Mattar Director · appointed 2025 · resigned 2026
Where else this board sits iWhere else this board sitsThe charitable fields these directors govern in elsewhere, by Charity Commission classification. Excludes this company and any charity it is the legal face of.
The sectors these directors govern in elsewhere. This company, and any charity it is the legal face of, are excluded - counting them would just tell you what you are already looking at.
Sources
Official record from Companies House. Governance Register calculates the connections.
Record details
- Company number
- 16143378
- Status
- Active
- Type
- Private Limited Company
- Accounts next due
- 30/09/2027
- Edition
- Register edition compiled 27th September 2026
- Labels
- Official record from Companies House · Calculated derived by Governance Register.
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