| Alexis Consulting Ltd | Professional & scientific | 2026 |
| Alexis Joinery Limited | Construction | 2023 |
| Alexiss Ltd | Construction | 2020 |
| Alexunicon Limited | Transport & logistics | 2019 |
| ALF Interiors Ltd | Construction | 2010 |
| Alfa Agrochemical PC | | 2015 |
| Alfa BES Limited | Wholesale & retail | 2024 |
| Alfa Life Ltd | Arts & recreation | 2022 |
| Alfa Services Ltd | Administrative & support | 2018 |
| Alfa Star Global Holdings Ltd. | Financial services | 2022 |
| Alfaiomi Techaid Initiative CIC | Information & communication | 2025 |
| Alfanex Ltd | Wholesale & retail | 2024 |
| Alffa Services Limited | Professional & scientific | 2016 |
| Alffeur Limited | Transport & logistics | 2025 |
| Alfie's Investments Ltd | Real estate | 2018 |
| Alfreda Court (Whitchurch) Maintenance Limited | Households | 1961 |
| Alfredo's Manchester Ltd | Hospitality | 2022 |
| Alfycan Limited | Wholesale & retail | 2019 |
| ALG GAS Plumbing and Heating Limited | Construction | 2019 |
| Algadaref Trading Ltd | Wholesale & retail | 2026 |
| Algamish Apps Ltd. | Manufacturing | 2020 |
| Algamish Consulting Ltd | Administrative & support | 2014 |
| Algamish Publishing Ltd | Information & communication | 2020 |
| Algi Transport Ltd | Transport & logistics | 2025 |
| Algipharma UK Limited | Manufacturing | 2017 |
| Algnayem Ltd | Wholesale & retail | 2025 |
| Algoma Restaurants Limited | Hospitality | 2015 |
| Algorithm Risk Consultancy Ltd | Information & communication | 2014 |
| Algsager Pubs Ltd | Hospitality | 2017 |
| Algud Company Ltd | Wholesale & retail | 2025 |
| ALH Fabrications (Yorkshire) Ltd | Manufacturing | 2024 |
| Alhalal Certification Limited | Professional & scientific | 2025 |
| Alhambra Labs & Pharma Ltd | Agriculture & fishing | 2021 |
| Alhanstar Ltd | Wholesale & retail | 2022 |
| Alhenives Ltd | Real estate | 2025 |
| Alhesar Ltd | Wholesale & retail | 2021 |
| ALI & Family Properties LLP | | 2023 |
| ALI & Family Property Ltd | Real estate | 2023 |
| ALI & Malik Homes Ltd | Real estate | 2025 |
| ALI Abdul Rahman Ltd | Wholesale & retail | 2025 |
| ALI Al-Hussaini ENT Surgery Ltd | Health & social care | 2020 |
| ALI and SON Cardiff Catering Ltd | Hospitality | 2025 |
| ALI Baba Shop Limited | Wholesale & retail | 2018 |
| ALI Couture Ltd | Wholesale & retail | 2026 |
| ALI Global International Trading (UK) Company Limited | Mining & quarrying | 2025 |
| ALI Land Ltd | Wholesale & retail | 2025 |
| ALI Nafosat Gocer Ltd | Wholesale & retail | 2024 |
| ALI Rajput Ltd | Wholesale & retail | 2021 |
| ALI RAZ Ltd | Wholesale & retail | 2025 |
| ALI Raza Global Ltd | Wholesale & retail | 2026 |
| ALI Solutions 01 Ltd | Administrative & support | 2020 |
| ALI Solutions 05 Ltd | Administrative & support | 2022 |
| ALI Solutions 06 Ltd | Administrative & support | 2020 |
| ALI Solutions 08 Ltd | Public administration | 2020 |
| ALI Solutions 13 Ltd | Public administration | 2020 |
| ALI Solutions 16 Ltd | Administrative & support | 2023 |
| ALI Solutions 17 Ltd | Administrative & support | 2020 |
| ALI Solutions 22 Ltd | Administrative & support | 2023 |
| ALI Waheed Ltd | Other services | 2018 |
| Alia Assets Management Ltd | Financial services | 2022 |
| Aliabdirhman and Friends Ltd | Wholesale & retail | 2026 |
| Aliada PC | | 2018 |
| Aliadiere Ltd | Other services | 2019 |
| Aliance Food Delivery Ltd | Wholesale & retail | 2010 |
| Alianda Limited | Information & communication | 2006 |
| Aliard Environmental Services Limited | Other services | 2000 |
| Alibaba (Selly Oak) Limited | Wholesale & retail | 2016 |
| Alice Business Ltd | Wholesale & retail | 2025 |
| Alice Evans Property Ltd | Real estate | 2019 |
| Alice Palace Properties Ltd. | Construction | 2016 |
| Alicja Chalupczynska Locum Ltd | Professional & scientific | 2019 |
| Alico Limited | Wholesale & retail | 2006 |
| Aliei Company Ltd | Professional & scientific | 2025 |
| Alien Space Works Limited | Mining & quarrying | 2021 |
| Alienated Magazine C.I.C. | Wholesale & retail | 2021 |
| Aliesha JAY Ltd | Health & social care | 2023 |
| Alif Locums Ltd | Wholesale & retail | 2016 |
| Align Properties Ltd | Financial services | 2019 |
| Aligned Estates Ltd | Households | 2025 |
| Aligned Management Limited | Professional & scientific | 2024 |
| Aligned Resources Limited | Professional & scientific | 2016 |
| Alignworks Pilates Ltd | Other services | 2025 |
| Aligra Personnel 01 Limited | Other services | 2019 |
| Aligra Personnel 02 Ltd | Other services | 2019 |
| Alinio Smile Design Limited | Health & social care | 2023 |
| Alinoshop Limited | Wholesale & retail | 2025 |
| Alioui Limited | Professional & scientific | 2024 |
| Aliph Ltd | Wholesale & retail | 2020 |
| Aliquin Limited | Wholesale & retail | 2020 |
| Alisof Limited | Hospitality | 2019 |
| Alison GAY Make-Up Limited | Other services | 2024 |
| Alison Jones Limited | Health & social care | 2013 |
| Alistair Burroughs Design Partnership Limited | Professional & scientific | 1988 |
| Alitek Ltd | Administrative & support | 2023 |
| Alium Audio Limited | Wholesale & retail | 2019 |
| Alive & Brave Ltd | Hospitality | 2025 |
| Alive-D Ltd | Wholesale & retail | 2007 |
| Alivea Ltd | Wholesale & retail | 2025 |
| Aliya Prom PC | | 2017 |
| Aliyat Limited | Wholesale & retail | 2025 |