| Alexa Maintenance & Building Ltd | Administrative & support | 2016 |
| Alexander Farming (Holdings) Limited | Agriculture & fishing | 2021 |
| Alexander Farming Limited | Agriculture & fishing | 1979 |
| Alexander Fisher Recruitment Ltd | Administrative & support | 2011 |
| Alexander Laird Ltd | Professional & scientific | 2018 |
| Alexander Mortgage Services Limited | Financial services | 2025 |
| Alexander Plastering Limited | Construction | 2003 |
| Alexander Property (Eynsford) Ltd | Real estate | 2023 |
| Aleyda Ltd | Transport & logistics | 2019 |
| ALF Brown's (Transport) Limited | Professional & scientific | 1962 |
| Alfred Caleb Limited | Real estate | 2025 |
| Alfred Michaels Limited | Real estate | 2025 |
| Alfred Rahman Ltd | Real estate | 2019 |
| Algan Property LLP | | 2010 |
| Algebra Solutions Limited | Information & communication | 2018 |
| Algo Logic Limited | Information & communication | 2013 |
| Alhambra Hotel Limited | Hospitality | 1992 |
| ALI Zaman Holdings Ltd | Real estate | 2025 |
| Alien Technologies Limited | Information & communication | 2024 |
| Alim Muana Services Limited | Transport & logistics | 2025 |
| Alim Tuition Ltd | Education | 2023 |
| Aliona Baranova Ltd | Arts & recreation | 2024 |
| ALL 'DEE Care Limited | Health & social care | 2023 |
| ALL Aspects Decorating Limited | Construction | 2026 |
| ALL Belong CIC | Education | 2026 |
| ALL Directions (Kent) C.I.C. | Education | 2011 |
| ALL Duct Installations Ltd | Construction | 2007 |
| ALL Fired UP Catering Ltd | Hospitality | 2024 |
| ALL Fitting Limited | Construction | 2024 |
| ALL Glory Cargo Limited | Transport & logistics | 2020 |
| ALL Kent Roofing Limited | Construction | 2024 |
| ALL London Legal Limited | Professional & scientific | 2024 |
| ALL Night Cars Holdings Ltd. | Financial services | 2012 |
| ALL Night Cars Ltd. | Transport & logistics | 2010 |
| ALL Round Bookkeeping Ltd | Professional & scientific | 2025 |
| ALL Saints Church Swanscombe Limited | Households | 2004 |
| ALL Scaffolding Services Kent Ltd | Construction | 2020 |
| ALL Seal Roofing & Building Ltd | Construction | 2026 |
| ALL Seasons Maintenance and Repair (South East) Limited | Administrative & support | 2006 |
| ALL Shades of Life CIC | Construction | 2019 |
| ALL Stage Solutions Limited | Construction | 2023 |
| ALL Star Fire Protection Limited | Administrative & support | 2019 |
| ALL Task Group Ltd | Construction | 2024 |
| ALL Things Maintenance Limited | Other services | 2018 |
| ALL Time Construction Ltd | Construction | 2024 |
| ALL Together Music Ltd | Information & communication | 2013 |
| ALL Type Engineering Limited | Manufacturing | 2017 |
| ALL2020 Ltd | Construction | 2017 |
| Allan Upsher Limited | Other services | 1978 |
| Allard Projects Company Ltd | Real estate | 2026 |
| Allbeauty Fulfilment Services Limited | Administrative & support | 2016 |
| Allbeauty Limited | Administrative & support | 2015 |
| Allbeauty Support Services Limited | Administrative & support | 2015 |
| Allcover Contracts Limited | Construction | 2023 |
| Allen & Claremont Property Ltd | Real estate | 2024 |
| Allen and IVY Property Ltd | Hospitality | 2025 |
| Allen Property Consultancy Ltd | Financial services | 2021 |
| Allen Property Management & Investments Limited | Real estate | 2023 |
| Allen Wilson Electrical Limited | Construction | 1995 |
| Allerford Court Management Limited | Real estate | 1977 |
| Allergy Aware Scheme Limited | Extraterritorial | 2007 |
| Allergy England Limited | Extraterritorial | 2013 |
| Allergy Europe Limited | Extraterritorial | 2013 |
| Allergy Research Limited | Professional & scientific | 1998 |
| Allergy UK Limited | Extraterritorial | 2007 |
| Allfix Property Maintenance Ltd | Administrative & support | 2015 |
| Allfix Roofing and Building Ltd | Construction | 2022 |
| Allgood Carpentry Limited | Construction | 2018 |
| Alli-Balogun Cargo & Logistics Limited | Transport & logistics | 2026 |
| Alliance Decor Ltd | Construction | 2010 |
| Alliance Lettings & Property Management Limited | Real estate | 2006 |
| Allied Remedial Treatments Limited | Construction | 1982 |
| Allied Trade Support Limited | Construction | 2011 |
| Allied Traders UK Ltd | Professional & scientific | 2014 |
| Allnwa Healthcare Services Ltd | Health & social care | 2025 |
| Alloaks Limited | Real estate | 2025 |
| Allodi Construction Ltd | Construction | 2023 |
| Allodi Property Developments Limited | Construction | 2011 |
| Allround Savings UK Limited | Administrative & support | 2013 |
| Allspec Services Ltd | Construction | 2019 |
| Allstar Electrical Services Limited | Construction | 2016 |
| Allweather Refrigeration Holdings Limited | Financial services | 2021 |
| Allweather Refrigeration Limited | Construction | 1997 |
| Ally MD Ltd | Information & communication | 2025 |
| Ally Real Estate Ltd | Construction | 2025 |
| Allyson Ltd | Health & social care | 2012 |
| Almanac Digital Limited | Information & communication | 2017 |
| Almond 1965 Limited | Extraterritorial | 2015 |
| Almond Careers Limited | Information & communication | 2013 |
| Alnpete Limited | Information & communication | 1998 |
| Alon Consulting Limited | Financial services | 2023 |
| Alpanagnana and Sons Limited | Information & communication | 2011 |
| Alpd Interiors Ltd | Construction | 2023 |
| Alpha Domestic Builders Ltd | Construction | 2019 |
| Alpha Hosting Ltd | Information & communication | 2019 |
| Alpha Refurbs Ltd | Construction | 2022 |
| Alpha Research Analytics Ltd | Professional & scientific | 2019 |
| Alpha Resolution Limited | Health & social care | 2014 |
| Alpha T.I.O Limited | Information & communication | 2015 |
| Alpha to Omega Accountancy Solutions Limited | Professional & scientific | 2022 |