| Alekpol Limited | South Croydon | 2016 |
| Aleks Dental Clinic Ltd | Nuneaton | 2018 |
| Aleks Smiles Ltd | Bradford | 2024 |
| Aleksandra Dahai Ltd | London | 2021 |
| Aleksandra Herrera-Sokolowska Limited | Beckenham | 2022 |
| Aleksandra Maria Limited | Clanfield | 2024 |
| Alekseer Limited | Solihull | 2022 |
| Aleksha Care Limited | Rochester | 2019 |
| Aleksic Consultancy Limited | Bedford | 2022 |
| Aleksmar Ltd | Swindon | 2021 |
| Alemai Ltd | Carshalton | 2019 |
| Alemdent Limited | Manchester | 2000 |
| Alena Dostinova Ltd | Tewkesbury | 2026 |
| Alenanna Ltd | St. Leonards-On-Sea | 2014 |
| Alenat Health Care Limited | South Croydon | 2021 |
| Aleniv Health Limited | Sutton Coldfield | 2026 |
| Alentar Care Limited | Hitchin | 2022 |
| Alentar Group Limited | Hitchin | 2022 |
| Alenwi Limited | Manchester | 2019 |
| Aleon Services (UK) Limited | Northampton | 2014 |
| Aleph Health Ltd | Billingham | 2023 |
| Aleph Medical Ltd | Solihull | 2014 |
| Aleph-Tav Healthcare Services Limited | Manchester | 2022 |
| Alera Health Ltd | Bury St. Edmunds | 2026 |
| Alera Hub CIC | London | 2025 |
| Alera Wellness and Cosmetics Clinic Ltd | Coventry | 2025 |
| Alerce Care Limited | Wakefield | 2026 |
| Alere Care Limited | Harrow | 2004 |
| Alerim Limited | Harlow | 2017 |
| Alerim Research Professionals Limited | Brentwood | 2016 |
| Alert Care Group Ltd | Ashford | 2018 |
| Alert Care Limited | Dagenham | 2024 |
| Alert Health Ltd | Inverness | 2013 |
| Alert Medical Services Ltd | Spalding | 2021 |
| Alert Wellness Ltd | London | 2022 |
| Alerta Solutions Limited | London | 2024 |
| Alesco Care Services Ltd | Broadstone | 2014 |
| Alesh Care Limited | Eastbourne | 2025 |
| Alesk.U Limited | Basingstoke | 2024 |
| Aleson Medical Services Ltd | Harlow | 2022 |
| Alessandro Ferrero Limited | Stockport | 2006 |
| Alessia&Co Ltd | Carterton | 2021 |
| Alessio Gessa Ltd | Richmond | 2023 |
| Alessio Riccobono Ltd | Bristol | 2024 |
| Alessio Vinci Ltd | Edinburgh | 2023 |
| Alestica Global Resources Ltd | Plymouth | 2025 |
| Alethea Fit Ltd | London | 2025 |
| Aletheia Academy Ltd | Birmingham | 2011 |
| Aletheia Reviews Ltd | Margate | 2024 |
| Aletho Dental Care Ltd | Wilmslow | 2022 |
| Alethos Therapies Limited | Lytham St. Annes | 2025 |
| Alettas Home Health Ltd | London | 2026 |
| Aleve Medical Services Ltd | | 2006 |
| Alevia Health Care Ltd | High Wycombe | 2010 |
| Alex & Sugs Medical Services Limited | Sutton Coldfield | 2022 |
| Alex A-Line Ltd | Street | 2019 |
| Alex Aesthetics Ltd | Benfleet | 2020 |
| Alex and Healthcare Ltd | Swindon | 2021 |
| Alex and Megha Limited | Billericay | 2026 |
| Alex Borsden Limited | Swansea | 2022 |
| Alex Boukas Ltd | Oxford | 2025 |
| Alex Brown Medical Ltd | Sheffield | 2021 |
| Alex Care Services Limited | Luton | 2018 |
| Alex Cliff Limited | Dorking | 2016 |
| Alex Consultancy Limited | Newcastle Under Lyme | 2021 |
| Alex Consultation Ltd | Hove | 2023 |
| Alex Cowey Ltd | Bath | 2012 |
| Alex Crockford Limited | Woking | 2016 |
| Alex D Karidis Limited | Brentwood | 1997 |
| Alex Davis (Bedford) Ltd | Manchester | 2016 |
| Alex Davis (Gosport) Limited | Manchester | 2011 |
| Alex Davis (Yarmouth) Ltd | Manchester | 2021 |
| Alex Doggett Personal Training Limited | Bourton-On-The-Water | 2012 |
| Alex Foundation Household Items | Manchester | 2021 |
| Alex George Ophthalmics Ltd. | Woodford Green | 2008 |
| Alex Grey Limited | Clifton | 2011 |
| Alex Griffin Limited | Exeter | 2013 |
| Alex Healthcare Ltd | London | 2013 |
| Alex Healthcare Services Ltd | Edinburgh | 2023 |
| Alex Holme Limited | Edinburgh | 2013 |
| Alex Jaja Ltd | Liverpool | 2021 |
| Alex Jones Ltd | Lewes | 2015 |
| Alex Kelly Limited | Romsey | 2007 |
| Alex Lawrence Limited | Tonbridge | 2022 |
| Alex Lewis Ltd | Chester Le Street | 2016 |
| Alex Lowther Ltd | Durham | 2019 |
| Alex Luckhurst Therapy Ltd | London | 2026 |
| Alex LYS Osteopathy Ltd | Wimborne | 2010 |
| Alex Medical Green Limited | North Finchley | 2013 |
| Alex Medical Ltd | Stockton On Tees | 2022 |
| Alex Muff Consultants Ltd | Halifax | 2025 |
| Alex Olds Holistic Limited | London | 2016 |
| Alex P Jones Limited | Middlesbrough | 2016 |
| Alex Pynen Limited | Fareham | 2023 |
| Alex RAD Limited | Elgin | 2016 |
| Alex Ramsden Professional Services Ltd | Witney | 2021 |
| Alex Read Associates Limited | London | 2021 |
| Alex Reid Medical Ltd | London | 2022 |
| Alex Rubin Plastic Surgery Ltd | London | 2023 |
| Alex Sava Ltd | Shepton Mallet | 2022 |