| A & C Environmental Ltd | Agriculture & fishing | 2004 |
| A & C Eyecare Limited | Wholesale & retail | 2024 |
| A & C Purchasing and Supply Limited | Administrative & support | 2016 |
| A & D Acquisitions Limited | Real estate | 2025 |
| A & D Group London Ltd | Wholesale & retail | 2021 |
| A & D Property Rentals Limited | Real estate | 2026 |
| A & D Vehicle Repair Centre Limited | Wholesale & retail | 2007 |
| A & D Workboats Ltd | Extraterritorial | 2025 |
| A & F Last Properties Ltd | Real estate | 2021 |
| A & FF Media CYF | Information & communication | 2014 |
| A & G Mobile (Repairs) Limited | Other services | 2015 |
| A & I Associates Ltd | Professional & scientific | 2019 |
| A & J Matthews Engineering Ltd | Professional & scientific | 2013 |
| A & J SA Properties Ltd | Real estate | 2025 |
| A & J Studio Build Ltd | Information & communication | 2025 |
| A & L Precision Engineering Limited | Manufacturing | 2013 |
| A & L Property Developments Group Limited | Construction | 2018 |
| A & L Property Solutions Ltd | Hospitality | 2020 |
| A & M Syndicates Ltd | Wholesale & retail | 2018 |
| A & N Leisure Ltd | Hospitality | 2019 |
| A & N Plumbing Services Limited | Construction | 2008 |
| A & N Rendering Specialists Ltd | Construction | 2020 |
| A & P Luckhurst Limited | Other services | 2016 |
| A & P Photographic Repairs Limited | Arts & recreation | 1989 |
| A & S Car Valet Services Ltd | Administrative & support | 2018 |
| A & S Commercial Services Limited | Administrative & support | 2016 |
| A & S Interiors Limited | Manufacturing | 2010 |
| A & T Houses Ltd | Real estate | 2024 |
| A & U (London) Ltd | Construction | 2013 |
| A & W Car Service Ltd | Wholesale & retail | 2022 |
| A & Z Property Group Ltd | Real estate | 2025 |
| A & Z UK Consultancy Ltd | Professional & scientific | 2016 |
| A 'N T Screenprint Limited | | 1987 |
| A - Team Security Ltd | Administrative & support | 2010 |
| A a & a Investments Limited | Real estate | 2022 |
| A a Consortium Ltd | Professional & scientific | 2017 |
| A a N Consulting Limited | Administrative & support | 2016 |
| A Algundi Ltd | Other services | 2023 |
| A Alwaked Construction Ltd | Construction | 2023 |
| A and B Car Sales Limited | Wholesale & retail | 2026 |
| A B Additional Needs Education Consultancy Ltd | Education | 2025 |
| A B C Films (UK) Limited | | 1986 |
| A B Catering Services Limited | Manufacturing | 2018 |
| A B Glass (Doors & Windows) Limited | Manufacturing | 2001 |
| A B K Property (South Wales) Limited | Construction | 2011 |
| A Beautiful Education Ltd | Information & communication | 2020 |
| A Binney Dental Surgery Limited | Health & social care | 2010 |
| A Blackwood Limited | Professional & scientific | 2014 |
| A Bonnie Abode Rentals Limited | Real estate | 2025 |
| A Brand Apart Television Limited | Information & communication | 2009 |
| A Brand Culture Ltd | Education | 2014 |
| A Bright Start Nursery (Rumney) Limited | Health & social care | 2013 |
| A C & J Financial Services Ltd | Financial services | 2016 |
| A Connors Electrical Ltd | Construction | 2022 |
| A CUP of Tea Ltd | Professional & scientific | 2017 |
| A Curtis Consultancy Ltd | Professional & scientific | 2020 |
| A Cuthbert & Co Limited | Arts & recreation | 2012 |
| A D Raine Consulting Ltd | Information & communication | 2025 |
| A Day 2 Remember Ltd | Wholesale & retail | 2023 |
| A Door Additions Ltd | Manufacturing | 2023 |
| A E Energy Solutions Ltd | Wholesale & retail | 2011 |
| A E Paterson Ltd | Professional & scientific | 2019 |
| A F Brooks Limited | Professional & scientific | 2014 |
| A F Deliveries Van Ltd | Other services | 2025 |
| A F Gardening Limited | Administrative & support | 2022 |
| A F Properties (Wales) Limited | Real estate | 2001 |
| A FI WE Ltd | Hospitality | 2019 |
| A Figgins Surveyors Ltd | Real estate | 2019 |
| A Flying Alligator Ltd | Information & communication | 2025 |
| A Franchising Limited | Administrative & support | 2019 |
| A Fraser Jones Limited | Wholesale & retail | 2003 |
| A G Commercials Ltd | Administrative & support | 2019 |
| A G Developments 1979 Limited | Construction | 2003 |
| A G H Aviation Services Limited | Manufacturing | 2026 |
| A G Z Limited | Construction | 2019 |
| A Garvey Limited | Professional & scientific | 2015 |
| A Good Taste Limited | Hospitality | 2019 |
| A Grubb Electrical Ltd | Construction | 2014 |
| A H J Maintenance Ltd | Construction | 2024 |
| A Hickman Plumbing & Heating Ltd | Construction | 2020 |
| A I Asset Management Limited | Real estate | 2015 |
| A J Block Laying Ltd | Construction | 2017 |
| A J Construction (SN) Limited | Construction | 2016 |
| A J Consultancy (Cardiff) Limited | Real estate | 2003 |
| A J Crews & Co Limited | Construction | 1974 |
| A J ENG Limited | Manufacturing | 2016 |
| A J Evans Auto Repair Services Ltd | Wholesale & retail | 2024 |
| A J Investments (Cardiff) Limited | Real estate | 2004 |
| A J Renovate Ltd | Construction | 2024 |
| A J Rooke Limited | Administrative & support | 2014 |
| A James TC Ltd | Health & social care | 2024 |
| A LA Carte Exotic Ltd | Wholesale & retail | 2025 |
| A Lewis Electrical Limited | Construction | 2017 |
| A List Wardrobe Ltd | Wholesale & retail | 2024 |
| A Little Unique Ltd | Wholesale & retail | 2021 |
| A M Construction 1 Ltd | Construction | 2011 |
| A M ETRADING13 Ltd | Wholesale & retail | 2020 |
| A M Holdings (London) Ltd | Real estate | 2018 |
| A Maintenance Company Ltd | Construction | 2017 |
| A Millward Limited | Financial services | 2016 |