| Alchemy Professional Risks Limited | London | 2023 |
| Alchemy Solutions Group Ltd | Gloucester | 2025 |
| Alchemy Topco Limited | Lynchwood | 2026 |
| Alchemy Tullan Ltd | Belfast | 2021 |
| Alchemy Underwriting Limited | London | 2017 |
| Alchemy Upstream Energy Limited | London | 2023 |
| Alchemy VC Ltd | London | 2021 |
| Alchh Limited | Westbourne | 2015 |
| Alchymy Ltd | Waltham Cross | 2026 |
| Alcid Investments Holdings Limited | Haverfordwest | 2022 |
| Alcid Investments Limited | Haverfordwest | 2020 |
| Alcn Holdings Limited | Preston | 2021 |
| Alco Capital Holdings Limited | Manchester | 2026 |
| Alco Capital Limited | Manchester | 2026 |
| Alco Investments Limited | London | 2005 |
| Alco Management Group Ltd | London | 2024 |
| Alco Trading & Enterprises Limited | London | 2007 |
| Alcock Jones Financial Planning Limited | Conwy | 1996 |
| Alcomet 2019 Limited | Kingswinford | 2019 |
| Alcomet 2022 Limited | Kingswinford | 2022 |
| Alcomet Holdings Limited | Kingswinford | 2015 |
| Alcomoto Holdings Limited | Waterlooville | 2026 |
| Alconbury Holdings Ltd | Pinner | 2024 |
| Alconex Holdings Limited | Winchester | 2022 |
| Alcor Holdings Limited | Blackburn | 2020 |
| Alcor UK Holdings Limited | London | 2020 |
| Alcor Underwriting London Limited | London | 2020 |
| Alcora Group Ltd | London | 2025 |
| Alcotec Limited | Pyrford | 2019 |
| Alcp Holdings Ltd | Manchester | 2024 |
| Alcro Holdings Limited | Chorley | 2025 |
| Alcuin General Partner Limited | Edinburgh | 2007 |
| Alcuin GP Limited | London | 2007 |
| Alcuin Investments Ltd | Bromley | 2025 |
| Alcyon Ventures Ltd | London | 2025 |
| ALD Investco Limited | Newcastle Upon Tyne | 2024 |
| ALD OGH UK Ltd | London | 2018 |
| Alda Holdings Limited | Huddersfield | 1999 |
| Aldabbous UK Investments Ltd | London | 2025 |
| Aldale Holdings Limited | London | 2025 |
| Aldar Development (LSQ) Limited | Uxbridge | 2023 |
| Aldara Holdings Ltd | London | 2026 |
| Aldborough Finance Limited | Nottinghamshire | 1986 |
| Aldbrook Mortgage Transaction 2025-1 PLC | London | 2025 |
| Aldbrook Mortgage Transaction 2026-1 PLC | London | 2026 |
| Aldbrook Mortgage Transaction Holdings 2025-1 Limited | London | 2025 |
| Aldbrook Mortgage Transaction Holdings 2026-1 Limited | London | 2026 |
| Aldbrough Hydrogen Storage Ltd | London | 2024 |
| Aldbury Capital Limited | Hertford | 2019 |
| Aldcroft Ventures Ltd | Bolton | 2026 |
| Aldebaran Holdings Limited | London | 2026 |
| Aldeburgh House Limited | Sudbury | 2023 |
| Aldeburgh Offshore Wind Holdings Limited | London | 2016 |
| Aldeburgh Offshore Wind Investments Limited | London | 2015 |
| Aldeby Underwriting Limited | London | 1998 |
| Alden Finance Limited | Gloucester | 1983 |
| Alden Square Ltd | London | 2026 |
| Aldenham Finance Limited | Greenford | 2005 |
| Aldenham Schools Holdings Limited | Elstree | 2019 |
| Alder Financial Limited | Gateshead | 2020 |
| Alder Grove Capital Limited | London | 2025 |
| Alder Heights Limited | Londonderry | 2023 |
| Alder Oak Holdings Limited | London | 2025 |
| Alder Real Estate UK Ltd | Dudley | 2025 |
| Alder Sportswear (Holdings) Limited | Okehampton | 2017 |
| Alder-Newton Holdings Limited | Congleton | 2023 |
| Alderaan Holdco Limited | London | 2013 |
| Alderbrae Investments Ltd | Old Harlow | 2019 |
| Alderbrook Finance Limited | London | 2013 |
| Alderbrook Financial Services Limited | Birmingham | 2013 |
| Alderbrook Holdings Ltd | Foston | 2025 |
| Alderburn Finance Limited | Edinburgh | 2015 |
| Alderclad 2025 Ltd | Seaham | 2024 |
| Aldercrest Group Holdings Ltd | London | 2026 |
| Alderforce Holdings (2) Limited | Wembley | 2023 |
| Alderforce Holdings Limited | Wembley | 2019 |
| Alderheath Ltd | Norwich | 2023 |
| Alderhurst Holdings Limited | Alton | 2026 |
| Alderley Advisors Limited | Herts | 2018 |
| Alderley Asset Management Limited | Manchester | 1997 |
| Alderley Developments Limited | London | 1983 |
| Alderley Edge Investments (Holdings) Unlimited | Manchester | 2021 |
| Alderley Engineering Limited | Crewe | 2016 |
| Alderley Group Holdings (2019) Limited | Chelsea | 2024 |
| Alderley Holdings 2019 Limited | Chelsea | 2021 |
| Alderley Insurance Limited | Birkenhead | 2023 |
| Alderley Money Ltd | Bury | 2020 |
| Alderley Park Ventures Limited | Nottingham | 2014 |
| Alderley Private Wealth Ltd | Alderley Edge | 2026 |
| Alderley Securities Limited | Alderley Edge | 2023 |
| Alderley Ventures (2019) Limited | Chelsea | 2024 |
| Alderley Wealth Management Ltd | Manchester | 2009 |
| Alderman Engineering Holdings Limited | Plymouth | 2023 |
| Alderman Strategy Limited | Southam | 2016 |
| Aldermere Holdings Ltd | Nantwich | 2026 |
| Alderminster Group Limited | Kenilworth | 2015 |
| Aldermont Group Limited | Solihull | 2014 |
| Aldermoor Holdings Ltd | London | 2026 |
| Aldermore Bank PLC | Reading | 1969 |
| Aldermore Group PLC | Reading | 2008 |