| AJB Elec Ltd | Construction | 2025 |
| Ajcgi Ltd | Information & communication | 2021 |
| Ajdd Ltd | Construction | 2021 |
| AJE 1 Ltd | Wholesale & retail | 2019 |
| AJH International Limited | Professional & scientific | 1994 |
| AJK Production Services Limited | Information & communication | 2017 |
| AJL Property Group Ltd | Real estate | 2025 |
| AJM Electrical Services Ltd | Manufacturing | 2016 |
| AJR Construction Services Limited | Construction | 2025 |
| Ajrc Ltd | Professional & scientific | 2022 |
| Ajspokecards Ltd | Wholesale & retail | 2025 |
| Ajtc Ltd | Transport & logistics | 2026 |
| AK Building Contractor Ltd | Construction | 2024 |
| AK Finds Ltd | Wholesale & retail | 2023 |
| AK Renovation Ltd | Construction | 2013 |
| Akari Clearpath Ltd | Professional & scientific | 2026 |
| Akehurst Bellnash (Lewes) Limited | Construction | 2024 |
| Akehurst Bellnash Developments Limited | Real estate | 2021 |
| Akehurst Bellnash Properties Ltd | Real estate | 2024 |
| Aklet Limited | Real estate | 2010 |
| AKP Properties Limited | Real estate | 2015 |
| Akroyd Family Investment Company Limited | Financial services | 2018 |
| Akshna Ltd | Wholesale & retail | 2024 |
| Aksu Grill Ltd | Hospitality | 2023 |
| AKZ Investments Ltd | Real estate | 2024 |
| AL Reid Photography Limited | Professional & scientific | 2015 |
| Alaa Hair and Beauty Ltd | Other services | 2026 |
| Alabiha International Ltd | Wholesale & retail | 2024 |
| Alakazam Magic Limited | Arts & recreation | 2008 |
| Alan Hill Services Limited | Construction | 2023 |
| Alan Sawyer Electrical Ltd | Construction | 2015 |
| Alarch Limited | Administrative & support | 2015 |
| Alaskan Chilled Ltd | Transport & logistics | 2016 |
| Albany Origins Ltd | Construction | 2023 |
| Albert Gorges Trading Limited | Financial services | 2024 |
| Albi-K Ltd | Hospitality | 2025 |
| Albin's Car Wash Ltd | Wholesale & retail | 2023 |
| Albion Britannia Limited | Financial services | 2023 |
| Albion Business Credit Limited | Financial services | 2018 |
| Albion Developments Ltd | Real estate | 2013 |
| Albion Press Limited | Information & communication | 2025 |
| Albrita Limited | Other services | 2017 |
| Alcaline Logistics Ltd | Transport & logistics | 2004 |
| Alchemyst Technologies Ltd | Information & communication | 2025 |
| Alderney Trading Ltd | Administrative & support | 2017 |
| Aldington Evangelical Mission | Other services | 2018 |
| Aldington Farms Limited | Agriculture & fishing | 2010 |
| Aldington Osteopathy Ltd | Health & social care | 2014 |
| Aldous Hodgkinson Consulting Limited | Professional & scientific | 2024 |
| Aldridge Property Limited | Real estate | 2024 |
| ALE Property Ltd | Real estate | 2021 |
| Alert Care Group Ltd | Health & social care | 2018 |
| Alert Solutions Limited | Hospitality | 2009 |
| Alex Chinneck Limited | Arts & recreation | 2015 |
| Alexa and Laura Limited | Wholesale & retail | 2017 |
| Alexander Mackie Associates Limited | Wholesale & retail | 1997 |
| Alexander Pictures Limited | Information & communication | 2015 |
| Alexander Roofing UK Limited | Construction | 2004 |
| Alexandra Patrick Limited | Professional & scientific | 2005 |
| Alexia Trans Ltd | Transport & logistics | 2014 |
| Alexsa Investments Limited | Financial services | 2019 |
| Alf's Commercials Ltd | Wholesale & retail | 2020 |
| Alforst Legal Consult Limited | Professional & scientific | 2025 |
| Algarvespania Refrigeration Ltd | Transport & logistics | 2013 |
| Algint Limited | Information & communication | 2012 |
| Algraca Hire Ltd | Administrative & support | 2020 |
| Alhambra (CYA) Limited | Professional & scientific | 2021 |
| ALI Baba Superstore Ltd | Wholesale & retail | 2020 |
| ALI Baba Takeaway Ltd | Hospitality | 2020 |
| ALI Barbers Ashford Ltd | Other services | 2023 |
| ALI Film Limited | Information & communication | 2023 |
| ALI Traders London Limited | Transport & logistics | 2020 |
| Alice Violet Creative Limited | Professional & scientific | 2021 |
| Aligner Guide Ltd | Manufacturing | 2026 |
| Alimar Consultancy Services Limited | Administrative & support | 2022 |
| Alina-Mb Company Ltd | Health & social care | 2019 |
| Alistair Mccafferty Ltd | Construction | 2017 |
| Aliter Associates Ltd | Administrative & support | 2019 |
| ALL Abstract Art Ltd | Arts & recreation | 2023 |
| ALL Access Group Limited | Professional & scientific | 2016 |
| ALL Access Limited | Construction | 2007 |
| ALL Access Scaffolding (South East) Limited | Extraterritorial | 2016 |
| ALL Access Scaffolding Limited | Construction | 2016 |
| ALL Access Services Limited | Construction | 2013 |
| ALL Aspects Electrical Contractors Ltd | Construction | 2021 |
| ALL Aspects Roofing & Building Ltd | Construction | 2026 |
| ALL Boilers Services Ltd | Construction | 2021 |
| ALL Building Southeast Ltd | Construction | 2020 |
| ALL Chauffeur Services Limited | Transport & logistics | 2015 |
| ALL Civils Ltd | Construction | 2024 |
| ALL Clear Waste Services Ltd | Water & waste | 2026 |
| ALL Commerce Ltd | Professional & scientific | 2026 |
| ALL Consultancy Limited | Construction | 2025 |
| ALL of America Limited | Administrative & support | 2003 |
| ALL OUR Homes Limited | Real estate | 2022 |
| ALL Seasons Home Improvements SE Ltd | Construction | 2019 |
| ALL Sorts Maintenance & Removals Ltd | Transport & logistics | 2024 |
| ALL Star Customs Limited | Wholesale & retail | 2016 |
| ALL Tech Electrical&Data Ltd | Construction | 2025 |
| ALL Things Woof Ltd | Wholesale & retail | 2024 |