| A and S Property Maintenance Limited | Construction | 2015 |
| A and S Stitching Room Ltd | Manufacturing | 2016 |
| A and V International Services Limited | | 1983 |
| A and W Capital Ltd | Professional & scientific | 2016 |
| A and Z Elite Properties Ltd | Real estate | 2025 |
| A Annesley Therapy Limited | Health & social care | 2022 |
| A Arthur Flooring Limited | Construction | 2007 |
| A Aujla Ltd | Information & communication | 2025 |
| A Autobodywork Ltd | Wholesale & retail | 2023 |
| A Azra Limited | Wholesale & retail | 2015 |
| A B & C Limited | Professional & scientific | 2000 |
| A B & C Secretarial Limited | Professional & scientific | 2003 |
| A B Associates (GB) Limited | Professional & scientific | 2008 |
| A B Car Rentals Limited | Administrative & support | 2019 |
| A B Chamberlain Ltd | Professional & scientific | 2015 |
| A B Direct Limited | Real estate | 2024 |
| A B Enterprises (UK) Ltd | Wholesale & retail | 2012 |
| A B Esson Properties Limited | Real estate | 2026 |
| A B Fine Art Foundry Limited | Manufacturing | 1992 |
| A B Hemmons Ltd | Professional & scientific | 2022 |
| A B K Investments Limited | Real estate | 2026 |
| A B K K Properties Ltd | Households | 2018 |
| A B LUX Limited | Transport & logistics | 2024 |
| A B Mobiles UK Limited | Wholesale & retail | 2020 |
| A B Mortgages & Investments Limited | Real estate | 2016 |
| A B Project Services Limited | Real estate | 2023 |
| A B Rejby Ltd | Hospitality | 2026 |
| A B Restaurant (Leyland) Limited | Hospitality | 2016 |
| A B Rigging Services Ltd | Construction | 2021 |
| A B S P Holdings Ltd | Extraterritorial | 2021 |
| A B Solutions Inc Ltd | Construction | 2025 |
| A B Tiles Limited | Wholesale & retail | 2003 |
| A B Utilities Ltd | Construction | 2018 |
| A B Victoria Removals Limited | Transport & logistics | 2014 |
| A B Vintners Limited | Other services | 2014 |
| A B W Cleaning Services Limited | Administrative & support | 2022 |
| A B W Matters Limited | Financial services | 2014 |
| A B Willoughby Ltd | Arts & recreation | 2021 |
| A B Woodflooring Limited | Construction | 2016 |
| A Baked Collective Ltd | Information & communication | 2025 |
| A Baker Consult Ltd | Information & communication | 2022 |
| A Baker Ltd | Information & communication | 2022 |
| A Baker's Confession Ltd | Manufacturing | 2023 |
| A Balanced Life Therapies Limited | Health & social care | 2023 |
| A Balm Ltd | Extraterritorial | 2019 |
| A Baraku Gardens Ltd | Administrative & support | 2022 |
| A Bardi Ltd | Information & communication | 2026 |
| A Barlow Ltd | Wholesale & retail | 2023 |
| A Basnet Properties Limited | Real estate | 2018 |
| A Beach Bedroom Ltd | Real estate | 2024 |
| A Beatty Brickwork Limited | Construction | 2003 |
| A Beautiful Call Ltd | Information & communication | 2026 |
| A Beautiful Company Ltd | Financial services | 2022 |
| A Beautiful Place to GET Lost Ltd | Administrative & support | 2023 |
| A Beautiful YOU Ltd | Health & social care | 2017 |
| A Beauty World Limited | Other services | 2015 |
| A BEE Investment Limited | Construction | 2020 |
| A BEE Properties Ltd | Real estate | 2025 |
| A Beer in Paris Limited | Professional & scientific | 2023 |
| A Belciu Construction Ltd | Construction | 2015 |
| A Bellara Diamonds Limited | Wholesale & retail | 2016 |
| A BEN Dovid Properties Limited | Real estate | 2021 |
| A Berryman Ltd | Professional & scientific | 2022 |
| A Bespoke Service Ltd. | Other services | 2015 |
| A BET a Technology Limited | Information & communication | 1990 |
| A Better Choice (ABC) Limited | Transport & logistics | 2013 |
| A Better Feeling Limited | Arts & recreation | 2018 |
| A Better Good Ltd | Professional & scientific | 2013 |
| A Better Home Limited | Real estate | 2020 |
| A Better Life Limited | Manufacturing | 2009 |
| A Bettor Way Ltd | Information & communication | 2015 |
| A Between C Ltd | Education | 2023 |
| A Bhad Holdings Ltd | Real estate | 2022 |
| A Bhad Limited | Wholesale & retail | 2012 |
| A Bici Fixing Ltd | Construction | 2016 |
| A Big Hand Ltd | Transport & logistics | 2024 |
| A Bigger Splash Consultancy Limited | Information & communication | 2024 |
| A Bigger Splash Productions LP | | 2021 |
| A Bilion Brick Ltd | Construction | 2020 |
| A Biotech Company Limited | Professional & scientific | 2022 |
| A BIT 2 Byte CIC | Information & communication | 2021 |
| A BIT of DIS N DAT Ltd | Professional & scientific | 2025 |
| A BIT of Help Limited | Other services | 2005 |
| A BIT of Knowledge Limited | Information & communication | 2013 |
| A BIT of TLC Limited | Information & communication | 2017 |
| A BIT Peckish Ltd | Hospitality | 2026 |
| A Black and White Story Ltd | Wholesale & retail | 2020 |
| A Black History of Art Limited | Professional & scientific | 2024 |
| A Black LIE Limited | Professional & scientific | 2013 |
| A Bloc Ltd | Professional & scientific | 2026 |
| A Bloch Holdings Ltd | Professional & scientific | 2021 |
| A Bold YOU Ltd | Administrative & support | 2020 |
| A Bond Consulting Limited | Administrative & support | 2016 |
| A Borkett Production Ltd | Information & communication | 2025 |
| A BOT Enterprises Ltd | Information & communication | 2023 |
| A Botha Limited | Information & communication | 2022 |
| A Bowry Limited | Construction | 2020 |
| A BOY and HIS Dog Ltd | Administrative & support | 2023 |
| A BOY From the RAF Limited | Construction | 2018 |
| A Bradleey Limited | Health & social care | 2026 |