| A.C. Lobo Ltd | Administrative & support | 2022 |
| A.C.E Buildings Ltd | Construction | 2025 |
| A.C.Framing Limited | Other services | 1970 |
| A.G Perrott Independent Social Work Ltd | Health & social care | 2024 |
| A.G Tavern Ltd | Hospitality | 2023 |
| A.H. Leach & Company Limited | Professional & scientific | 1999 |
| A.H.Taqui Limited | Health & social care | 2014 |
| A.I.A Property Solutions Ltd | Real estate | 2024 |
| A.I.K Optics Ltd | Health & social care | 2022 |
| A.J. Pies and Pastries (Group) Limited | Financial services | 2025 |
| A.J. Pies and Pastries (Holdings) Limited | Financial services | 2021 |
| A.J. Pies and Pastries Limited | Manufacturing | 2011 |
| A.J.N Electrical (Yorkshire) Ltd | Construction | 2010 |
| A.K Getaway Rentals Ltd | Real estate | 2025 |
| A.N Optical Services Ltd | Public administration | 2023 |
| A.N.S. Real Estate Limited | Real estate | 2019 |
| A.S Carr Properties Ltd | Real estate | 2023 |
| A.S.A Global Limited | Health & social care | 2020 |
| A.S.A Investments Ltd | Health & social care | 2013 |
| A.SHAIKH2 Engineering Ltd | Professional & scientific | 2025 |
| A.T.L. Recovery Limited | Wholesale & retail | 2010 |
| A1 Asbestos Service Ltd | Construction | 2023 |
| A1 Beverages Ltd. | Wholesale & retail | 2016 |
| A1 Breakdown Recovery Services Limited | Transport & logistics | 2024 |
| A1 City Tyres Ltd | Wholesale & retail | 2026 |
| A1 Computers Ltd | Wholesale & retail | 2023 |
| A1 Contractors HD Ltd | Construction | 2026 |
| A1 Pump Crete Ltd | Construction | 2007 |
| A1 Taxi (Hudds) Ltd | Transport & logistics | 2018 |
| A1 Travels & Tours Ltd | Administrative & support | 2024 |
| A1 Tyres PVT Ltd | Wholesale & retail | 2024 |
| A2 Studio Design Ltd | Professional & scientific | 2026 |
| A2 Z Enterpriser Ltd | Wholesale & retail | 2026 |
| A2J2B Haulage Ltd | Transport & logistics | 2025 |
| A2Z DIY Ltd | Wholesale & retail | 2023 |
| A2Z Empire Limited | Wholesale & retail | 2020 |
| A4CYBER Intelligence & Software Ltd | Information & communication | 2026 |
| AA Advanced Technologies Ltd | Information & communication | 2025 |
| AA Business Solutions Limited | Professional & scientific | 2003 |
| AA Delivery Services Ltd | Transport & logistics | 2023 |
| AA Dental Ltd | Health & social care | 2012 |
| AA Electrical BZ Limited | Construction | 2017 |
| AA Enterprise HD Ltd | Transport & logistics | 2024 |
| AA Manzoor Limited | Health & social care | 2016 |
| AA Optikal Limited | Wholesale & retail | 2022 |
| AA Plus Delivery Limited | Transport & logistics | 2024 |
| AA Properties HD Ltd | Real estate | 2025 |
| AA1881 Ltd | Wholesale & retail | 2019 |
| AAA Couriers Ltd | Transport & logistics | 2017 |
| AAA Hydraulic Services Limited | Professional & scientific | 2014 |
| Aadam Optical Ltd | Health & social care | 2023 |
| Aafiat Trading Ltd | Wholesale & retail | 2021 |
| Aaghaaz Ltd | Wholesale & retail | 2025 |
| AAH BAH Ltd | Hospitality | 2025 |
| Aairini Ltd | Administrative & support | 2026 |
| Aaishah Trading Ltd | Wholesale & retail | 2023 |
| Aaks Services Ltd | Health & social care | 2019 |
| Aaljp Solutions Ltd | Administrative & support | 2026 |
| AAM Store Ltd | Wholesale & retail | 2024 |
| Aamman Trading Ltd | Wholesale & retail | 2020 |
| Aansa Hijabs Ltd | Wholesale & retail | 2023 |
| AAQ Law Ltd | Professional & scientific | 2026 |
| Aarc Solutions Limited | Information & communication | 2026 |
| Aardvark Associates Ltd | Professional & scientific | 2015 |
| Aardwork Limited | Information & communication | 2015 |
| Aariyah Souq Ltd | Wholesale & retail | 2024 |
| Aariz Services Ltd | Transport & logistics | 2023 |
| Aaron Arkwright Engineering Limited | Manufacturing | 1999 |
| AAS Trading Ltd | Administrative & support | 2017 |
| Aasd Ltd | Information & communication | 2015 |
| Aashirvad Retail Ltd | Wholesale & retail | 2025 |
| AAU Dent Ltd | Health & social care | 2022 |
| AAY Asset Management Ltd | Real estate | 2023 |
| AAY Car Care Ltd | Wholesale & retail | 2023 |
| AAY Traders Ltd | Wholesale & retail | 2023 |
| Aaya Enterprise Ltd | Wholesale & retail | 2023 |
| Aazes Limited | Information & communication | 2012 |
| Aazz Trading Limited | Wholesale & retail | 2022 |
| AB and KM Ltd | Real estate | 2026 |
| AB Breakdown Services Ltd | Wholesale & retail | 2023 |
| AB Concrete Services Ltd | Construction | 2025 |
| AB Constructions (West Yorkshire) Ltd | Construction | 2018 |
| AB County Transport Ltd | Transport & logistics | 2023 |
| AB Electrical Services (Yorkshire) Ltd | Construction | 2022 |
| AB Home Improvement Yorkshire Limited | Construction | 2024 |
| AB Multi-Trade Ltd | Administrative & support | 2013 |
| AB Pharma Group Ltd | Health & social care | 2022 |
| AB Swift Travels Ltd | Transport & logistics | 2024 |
| Ab&L Ltd | Hospitality | 2020 |
| ABA Empire Limited | Wholesale & retail | 2024 |
| Abacus Civils Ltd | Construction | 2025 |
| Abadkanama Ltd | Real estate | 2020 |
| Abalyne Property Limited | Real estate | 2016 |
| Abanadrew Ltd | Health & social care | 2025 |
| Abaris International 2021 Limited | Wholesale & retail | 2021 |
| Abaris International Ltd | Wholesale & retail | 2003 |
| Abbacus Engineering Design Services Limited | | 1989 |
| Abbas Kurt Food Ltd | Hospitality | 2024 |
| Abbasi Import and Export Ltd | Wholesale & retail | 2025 |
| Abbatia Limited | Wholesale & retail | 2002 |