| AYA Logistics UK Ltd | Transport & logistics | 2019 |
| AYA Pro Services Limited | Administrative & support | 2025 |
| Ayab Ltd | Wholesale & retail | 2025 |
| Ayah Halal Ltd | Wholesale & retail | 2025 |
| Ayannis Investments Ltd | Real estate | 2021 |
| Ayapropertiesuk Ltd | Real estate | 2025 |
| Ayatuni Property Ltd | Financial services | 2025 |
| Aycliffe Chop Suey House Limited | Hospitality | 2023 |
| Aycliffe Plant Management Services Ltd | Professional & scientific | 2023 |
| Ayda Jules Properties Ltd | Real estate | 2024 |
| Aydin Holdings Limited | Financial services | 2018 |
| Aydin Language Services Ltd | Professional & scientific | 2021 |
| Aydo Electric Innovation Ltd | Manufacturing | 2023 |
| Ayesha Advisory Limited | Professional & scientific | 2019 |
| Ayesha Management Limited | Real estate | 2024 |
| AYK3R Studio Ltd | Professional & scientific | 2025 |
| Ayko Digital Limited | Information & communication | 2019 |
| Ayla Builds Ltd | Construction | 2024 |
| Ayla Wealth Management Ltd | Professional & scientific | 2020 |
| Aylesbury Park Golf Club Limited | Arts & recreation | 1999 |
| Aylishbakes Ltd | Hospitality | 2020 |
| Ayomide 'Banwo Studios Ltd | Professional & scientific | 2025 |
| Ayotta Technologies Limited | Information & communication | 2010 |
| Ayre Digital Ltd | Information & communication | 2025 |
| Ayre Limited | Information & communication | 2018 |
| Ayres Vause Accountancy Ltd | Professional & scientific | 2015 |
| Aysgarth Accountants Limited | Professional & scientific | 2012 |
| Aystheticsuk Ltd | Wholesale & retail | 2024 |
| Aysun Property Management Limited | Real estate | 2005 |
| Aytor Trans Limited | Transport & logistics | 2018 |
| Ayur Mantra Ayurvedic Spa Ltd | Other services | 2020 |
| Ayur Mantra Property Ltd | Real estate | 2021 |
| AYZ Services Limited | Transport & logistics | 2024 |
| Ayza Consulting Ltd | Information & communication | 2021 |
| Ayzal Properties Ltd | Real estate | 2026 |
| AZ Coffee Ltd | Hospitality | 2018 |
| AZ Decorating Ltd | Construction | 2020 |
| AZ Online Ltd | Wholesale & retail | 2020 |
| AZ Production Kitchen Limited | Hospitality | 2024 |
| AZ Property (Leeds) Ltd | Real estate | 2026 |
| AZA Paper Ltd | Wholesale & retail | 2024 |
| Azaan Property Limited | Real estate | 2020 |
| Azaban Assets Ltd | Real estate | 2022 |
| Azaban Supermarket Ltd | Wholesale & retail | 2019 |
| Azaban Wholesale Ltd | Wholesale & retail | 2023 |
| Azad-Tech Ltd | Wholesale & retail | 2025 |
| Azalea MAE Holdings Limited | Financial services | 2022 |
| Azama Limited | Hospitality | 2025 |
| Azanda Limited | Professional & scientific | 2018 |
| Azeeza Express Ltd | Transport & logistics | 2025 |
| Azen Snack Stations Ltd | Hospitality | 2023 |
| Azena AVA Universal Ltd | Administrative & support | 2015 |
| Azer Industrial & Development Consortium Ltd | Hospitality | 2019 |
| AZH Property Holdings Ltd | Real estate | 2025 |
| Aziim Infotech Ltd | Information & communication | 2025 |
| Aziz Property and Lettings Limited | Real estate | 2025 |
| Aziz Property Investments Ltd | Real estate | 2019 |
| Aziz Raza Catering Ltd | Hospitality | 2023 |
| Azky Tech Ltd | Information & communication | 2019 |
| Azmar Restaurant Leeds Ltd | Hospitality | 2025 |
| Azmara Salon Ltd | Other services | 2023 |
| Azmarino Fashion Boutique Limited | Wholesale & retail | 2024 |
| Azmlete Ltd | Wholesale & retail | 2025 |
| AZN Tech Solutions Ltd | Real estate | 2022 |
| Azophi Construction Limited | Construction | 2021 |
| Azoth Nephili Collective Limited | Manufacturing | 2025 |
| AZP Properties Ltd | Households | 2021 |
| Aztec Presentations Holdings Limited | Financial services | 2026 |
| Aztec Presentations Limited | Manufacturing | 1993 |
| Aztecha Ltd | Information & communication | 1997 |
| Azulrosa Limited | Information & communication | 2014 |
| Azure Consulting Limited | Education | 2002 |
| Azure Inspirations Ltd | Professional & scientific | 2026 |
| Azure Jewellery Workshop Limited | Manufacturing | 2024 |
| Azure Premier Consultancy Ltd | Financial services | 2013 |
| Azure RD Limited | Information & communication | 2020 |
| Azurite Cost Consulting Ltd | Construction | 2024 |
| B & a Upholstery (Leeds) Limited | Manufacturing | 2003 |
| B & B Pickard (Leeds) Limited | Real estate | 2012 |
| B & B Property Investment Limited | Real estate | 2016 |
| B & G Restaurants Ltd | Hospitality | 2016 |
| B & H Accountancy Limited | Professional & scientific | 2009 |
| B & J Kempsons Limited | Real estate | 2011 |
| B & K Clothing Ltd | Wholesale & retail | 2019 |
| B & K Motors (Leeds) Limited | Wholesale & retail | 2021 |
| B & K Passmore Limited | Construction | 2001 |
| B & K Systems Limited | Construction | 1998 |
| B & M Sheet Metal (Leeds) Limited | Manufacturing | 2000 |
| B & M-Care Ltd. | Wholesale & retail | 2000 |
| B & N Sales Limited | Wholesale & retail | 2022 |
| B & O Properties Ltd | Real estate | 2006 |
| B & R Gallagher (Holdings) Limited | Administrative & support | 2008 |
| B & S Scaffolding (Yorks) Limited | Construction | 2006 |
| B & W Property Management Ltd | Real estate | 2007 |
| B 164 Limited | Hospitality | 2016 |
| B a Chambers Limited | Professional & scientific | 2017 |
| B a Contracting Limited | Financial services | 2019 |
| B ALI Consultants Limited | Administrative & support | 2017 |
| B and G Healthcare Professionals Ltd | Health & social care | 2024 |
| B B Bargains Ltd | Wholesale & retail | 2025 |