| Alfa Agent Limited | Wholesale & retail | 2014 |
| Alfa Build Ltd | Construction | 2020 |
| Alfabi Limited | Real estate | 2024 |
| Alfer Electrics Ltd | Construction | 2023 |
| Alfie Investments Limited | Real estate | 2023 |
| Alfie Rentals Limited | Other services | 2018 |
| Algato Ltd | Real estate | 2022 |
| Algeo 23 Ltd | Transport & logistics | 2024 |
| Algol Healthcare Ltd | Health & social care | 2024 |
| Alhaay Property Ltd | Real estate | 2026 |
| Alhafez-Uk Ltd | Wholesale & retail | 2023 |
| Alhaj for Retail Ltd | Wholesale & retail | 2025 |
| Alhambra Wine Bar Limited | Hospitality | 2019 |
| ALI & Sons, Property Development Ltd | Real estate | 2023 |
| ALI Barber Walton Ltd | Other services | 2026 |
| ALI Consultancy Ltd | Professional & scientific | 2026 |
| ALI Group Holdings Limited | Real estate | 2017 |
| ALI Herdman Development Limited | Professional & scientific | 2009 |
| Ali's News Ltd | Wholesale & retail | 2014 |
| Ali's News Trading Limited | Wholesale & retail | 2018 |
| Aliana Law Limited | Professional & scientific | 2017 |
| Aliana Properties Limited | Real estate | 2007 |
| Alibi Group Limited | Administrative & support | 2026 |
| Alice Addison Ltd | Wholesale & retail | 2024 |
| Alice Food Limited | Hospitality | 2016 |
| Alice Tartt Limited | Financial services | 2025 |
| Alico Services (UK) Ltd | Financial services | 2013 |
| Alicoatasa Property Ltd | Real estate | 2018 |
| Aliegro Ltd | Transport & logistics | 2023 |
| Alien Electronics Limited | Wholesale & retail | 2013 |
| Alight Electrical Limited | Construction | 1992 |
| Align Advisory Ltd | Professional & scientific | 2026 |
| Align Brickwork Limited | Construction | 2025 |
| Align Care & Support Services Ltd | Hospitality | 2026 |
| Align Engineering and Surveying Ltd | Other services | 2017 |
| Align Healthcare Clinic Ltd | Health & social care | 2021 |
| Align Property Group Ltd | Real estate | 2025 |
| Align Recruitment Northwest Ltd | Administrative & support | 2019 |
| Aligned Legal Cashiering Ltd | Professional & scientific | 2025 |
| Aligned Property Management Ltd | Households | 2025 |
| Alikat Illumination Ltd | Professional & scientific | 2013 |
| Alikkos Catering Limited | Hospitality | 2025 |
| Alilu Properties Ltd | Real estate | 2025 |
| Alim Care Ltd | Public administration | 2025 |
| Alimenta Food Distribution Ltd | Wholesale & retail | 2025 |
| Alin Niculae Ltd | Transport & logistics | 2015 |
| Alina Foods Ltd | Wholesale & retail | 2025 |
| Alinadoors.Com Limited | Wholesale & retail | 2025 |
| Alinbrook Limited | Real estate | 1984 |
| Aliniti Limited | Information & communication | 2025 |
| Aliplas Ltd | Manufacturing | 2016 |
| Alir Marine Ltd | Transport & logistics | 2025 |
| Alis YKR Ltd | Professional & scientific | 2025 |
| ALIS58 Property Management Ltd | Construction | 2018 |
| Alisco IT Limited | Information & communication | 2018 |
| Alison Acland Trading Limited | Agriculture & fishing | 2014 |
| Alison Mccormack & Co Ltd | Professional & scientific | 2022 |
| Alison's Dutch Designer Florist Ltd | Wholesale & retail | 2019 |
| Alive & Dirty Limited | Wholesale & retail | 2004 |
| Alivienne Ltd | Wholesale & retail | 2025 |
| Alivo Limited | Wholesale & retail | 2013 |
| Alixconnorslt Ltd | Health & social care | 2022 |
| Aliyar Exoryn Ltd | Manufacturing | 2026 |
| Aliyar Exovian Ltd | Manufacturing | 2025 |
| Alize Shipping Co. Ltd | Wholesale & retail | 2022 |
| Ali’S Candy Cover Ltd | Wholesale & retail | 2026 |
| ALJ Kitchens Ltd | Professional & scientific | 2021 |
| Aljumaily Limited | Construction | 2015 |
| Alka Safety Consultancy Services Ltd | Administrative & support | 2018 |
| Alkaline Clothings Ltd | Wholesale & retail | 2023 |
| Alkhalid Trading Ltd | Wholesale & retail | 2023 |
| ALL About EVE Tanning Solutions Ltd | Other services | 2018 |
| ALL About Futures Limited | Education | 2013 |
| ALL About Podiatry Ltd | Health & social care | 2012 |
| ALL About Stem Limited | Education | 2011 |
| ALL About the Birds Ltd | Administrative & support | 2019 |
| ALL Above Board Ltd | Construction | 2025 |
| ALL Access Properties Limited | Real estate | 2025 |
| ALL Accountancy Ltd | Professional & scientific | 2026 |
| ALL Aspect Property Services (UK) Ltd | Construction | 2012 |
| ALL Aspects Damp, Insulation and Timber Solutions Ltd | Construction | 2016 |
| ALL Aspects Properties Limited | Real estate | 2025 |
| ALL Aspects Solar Ltd | Administrative & support | 2024 |
| ALL Banners Limited | Manufacturing | 2023 |
| ALL Build NW Ltd | Construction | 2014 |
| ALL Children Matter Ltd | Health & social care | 2020 |
| ALL Clean Pressure Washing Limited | Administrative & support | 2023 |
| ALL Clear Film Services Ltd | Information & communication | 2009 |
| ALL Climate Solutions Ltd | Construction | 2021 |
| ALL Day Build Away Ltd | Construction | 2025 |
| ALL Day Poke Ltd | Wholesale & retail | 2025 |
| ALL Day Records Ltd | Arts & recreation | 2025 |
| ALL Done Cleaning Limited | Administrative & support | 2018 |
| ALL Ears Poetry Ltd | Arts & recreation | 2024 |
| ALL Family Services Ltd | Real estate | 2017 |
| ALL Fords Recycling Centre Limited | Wholesale & retail | 2007 |
| ALL Fresh Done Cleaning Ltd | Administrative & support | 2021 |
| ALL Gone Removals Limited | Transport & logistics | 2018 |
| ALL Greek Dairy Limited | Manufacturing | 2018 |
| ALL in Care 9 Ltd | Health & social care | 2025 |