| Aldersberg Limited | London | 2024 |
| Aldersgate Financial Limited | Swanley Village | 2009 |
| Aldersgate Funding Limited | Altrincham | 2019 |
| Aldersgate Holding Company Limited | London | 2019 |
| Aldersham Investments Limited | Dover | 2026 |
| Aldershot Group Limited | Waterlooville | 2026 |
| Aldersinvest Limited | London | 2021 |
| Aldersley Finance Ltd | Much Wenlock | 2021 |
| Alderson and Horan Holding Company Ltd | Clayton Le Moors | 2018 |
| Alderson Asset Management Limited | Louth | 2022 |
| Alderson Care Group Limited | Beamish | 2017 |
| Alderson Digital Ltd | London | 2018 |
| Alderson Family Investco Limited | Washington | 2023 |
| Alderstone Holdings Ltd | London | 2024 |
| Aldervane Holdings Ltd | Kettering | 2026 |
| Aldervine Limited | London | 2025 |
| Alderway (Engco) Ltd | London | 2024 |
| Alderway 17 Limited | London | 2024 |
| Alderway L17 Limited | London | 2025 |
| Alderway Properties Limited | London | 2026 |
| Alderwood Developments Limited | Newtownards | 2004 |
| Aldery Ltd | London | 2026 |
| Aldgate Education Bidco Ltd | Ross-On-Wye | 2018 |
| Aldgate Education Midco 2 Ltd | Ross On Wye | 2018 |
| Aldgate Education Midco 3 Ltd | Ross On Wye | 2018 |
| Aldgate Education Midco 4 Ltd | Ross On Wye | 2018 |
| Aldgate Holdings Ltd | Driffield | 2023 |
| Aldgate Hotel Holdco Limited | London | 2021 |
| Aldgate Investment Management Ltd | London | 2025 |
| Aldgate Properties (Holdings) Limited | London | 2020 |
| Aldgate Retention Funding Limited | London | 2021 |
| Aldgate Wealth Management Limited | Hull | 2025 |
| Aldgate Wealth Planning Ltd | Hull | 2022 |
| Aldhouse Holdings Ltd | Waterlooville | 2024 |
| Aldington Capital Limited | Harrow | 1999 |
| Aldium Care Insurance Services Ltd | Merseyside | 2001 |
| Aldium Insurance Services Ltd | South Wirral | 1996 |
| Aldium Ltd | Merseyside | 2007 |
| Aldium Management Services Limited | Merseyside | 2001 |
| Aldji Holding Limited | Faringdon | 2025 |
| Aldo Mark Services Limited | Manchester | 2018 |
| Aldoma Ltd | London | 2026 |
| Aldonai Group Limited | Nottingham | 2024 |
| Aldous & Stamp Limited | Beckenham | 1968 |
| Aldra Holdings Limited | London | 2025 |
| Aldrich Group Limited | London | 2015 |
| Aldridge Book-Keeping Services Limited | Walsall | 2003 |
| Aldridge Capital Limited | London | 2013 |
| Aldridge Family Investments Limited | Droitwich | 2023 |
| Aldridge Garages Limited | Stafford | 2016 |
| Aldridge Holdings & Investments Ltd | Dudley | 2025 |
| Aldridge Limited | London | 2020 |
| Aldridge Mortgages & Protection Limited | Walsall | 2023 |
| Aldridge Sand & Gravel Ltd | Birmingham | 2019 |
| Aldridge Supply & Finance Limited | Birmingham | 2004 |
| Aldrin Bidco Limited | Loughborough | 2020 |
| Aldrin Holdings Limited | Loughborough | 2020 |
| Aldrin Mid-Holdings Limited | Loughborough | 2020 |
| Aldrin Sub-Holdings Limited | Loughborough | 2020 |
| Aldrock Properties Limited | Blackburn | 2017 |
| Aldron Holdings Limited | Manchester | 2019 |
| Aldton Park Financial Services Limited | Wembley | 2019 |
| Aldton Park Holdings Ltd | Wembley | 2025 |
| Aldus Holdings (UK) Limited | Edinburgh | 2021 |
| Aldustria (Launceston) Holdings Ltd | Newport | 2023 |
| Aldvent Ltd | Sherborne | 2022 |
| Aldwood Ltd | Sale | 2025 |
| Aldwych Administration Services Limited | London | 1988 |
| Aldwych Finance Limited | | 2003 |
| Aldwych Marine Holdings Ltd | Chester | 2007 |
| ALE (Edinburgh) Ltd | Edinburgh | 2024 |
| ALE Holdings Limited | Brough | 2019 |
| ALE Radu Mortgage Associates Ltd | Rotherham | 2020 |
| ALE Tales Ltd | Poole | 2025 |
| Alea Finance Ltd | London | 2017 |
| Alea Iacta EST Limited | Esher | 2024 |
| Alea Risk Limited | Watford | 2015 |
| Aleah Holdings and Investments Ltd | Dudley | 2025 |
| Aleal Limited | London | 2012 |
| Alebu Global Holdings Ltd | London | 2026 |
| Alec Holdings Limited | St Helens | 2026 |
| Alec Hughes Limited | Liverpool | 2022 |
| Alect Holdings Limited | Ilkeston | 2020 |
| Alecto Capital Management Ltd | London | 2026 |
| Alecto Restructuring Ltd | London | 2026 |
| Aled Williams Financial Management Ltd | Swansea Vale | 2018 |
| Aleen Properties Ltd | Wigston | 2022 |
| Aleezeh One Limited | Reigate | 2014 |
| Alef Capital Limited | London | 2025 |
| Alegina Limited | Southampton | 2016 |
| Alegra Holdings Ltd | London | 2021 |
| Alegra Strategic Limited | York | 2020 |
| Alegre Estates Limited | Cardiff | 2024 |
| Alegre Interco Limited | London | 2020 |
| Alegre Investments Limited | Nottingham | 2024 |
| Alegre Midco UK Limited | London | 2020 |
| Alegre Topco UK Limited | London | 2019 |
| Aleifr Holdings Limited | Milton Keynes | 2026 |
| Aleixo Capital Ltd | London | 2026 |
| Alejandro Holdings Limited | London | 2025 |