| 1 Accounts Online Ltd | Professional & scientific | 2010 |
| 1.S.A.F Ltd | Manufacturing | 2021 |
| 100 Percent Engineering Limited | Professional & scientific | 2019 |
| 11 Eleven Motion Pictures Ltd | Information & communication | 2024 |
| 11TENTHS Ltd | Wholesale & retail | 2022 |
| 2 Point 4 United Ltd | Wholesale & retail | 2022 |
| 2-3 Amor Way Limited | Real estate | 2025 |
| 2NDLANGUAGE Limited | Information & communication | 2006 |
| 4 Counties OIL Heating Specialists Ltd | Construction | 2025 |
| 4 the Parade (Management Company) Limited | Households | 2021 |
| 4D Architecture Ltd | Professional & scientific | 2006 |
| 4DEVZ Ltd | Administrative & support | 2025 |
| 4OUR Ltd | Professional & scientific | 2025 |
| 512 KR (Freehold) Limited | Households | 2023 |
| 7 Point Construction Ltd | Construction | 2025 |
| 87E5 Property Limited | Construction | 2019 |
| A J Prentice Building and Renovation Ltd | Construction | 2022 |
| A M N Foam Limited | Manufacturing | 2005 |
| A Maravela Ltd | Health & social care | 2015 |
| A P Plastic Fabrications Ltd | Manufacturing | 2012 |
| A Q Morgan Limited | Professional & scientific | 2011 |
| A S T UK Electrical Services Ltd | Construction | 2013 |
| A&T Living Ltd | Real estate | 2025 |
| A.B. Metson & SON Limited | Agriculture & fishing | 1963 |
| A.D.T. Industries Limited | | 1982 |
| A.F.L. Trucks Limited | Manufacturing | 1988 |
| A.J.D.N Limited | Other services | 2022 |
| A.M. Aviation Services Ltd | Manufacturing | 2016 |
| Aa&Ip Haulage Ltd | Transport & logistics | 2017 |
| Aaashnaa Ltd | Wholesale & retail | 2025 |
| Aacb Care Limited | Health & social care | 2017 |
| Aandk (BHH) Limited | Financial services | 2013 |
| Abbeycroft Enterprises Limited | Hospitality | 2017 |
| Abbeycroft Leisure | Arts & recreation | 2004 |
| ABC Group Solutions Ltd | Administrative & support | 2026 |
| ABC Spine Limited | Health & social care | 2016 |
| Abiha Supermarket Ltd | Wholesale & retail | 2020 |
| ABLE1 Resources Limited | Construction | 2008 |
| Abrasive Holdings Ltd | Wholesale & retail | 2025 |
| Absco Limited | Wholesale & retail | 2002 |
| ABT Projects Ltd | Professional & scientific | 2021 |
| Abtus Limited | Manufacturing | 2001 |
| Access Expeditions Ltd | Manufacturing | 2016 |
| Ace Maintenance & Repairs Ltd | Construction | 2022 |
| Ace of Spades Landscapes Ltd | Administrative & support | 2013 |
| ACS Access Control Systems Ltd | Wholesale & retail | 2025 |
| ADA Supplier Limited | Wholesale & retail | 2025 |
| Addenbrooke's Kidney Patients Association Limited | Health & social care | 1978 |
| Adenexglobal Limited | Administrative & support | 2025 |
| Adewest Limited | Wholesale & retail | 2016 |
| ADNAN123 Limited | Wholesale & retail | 2025 |
| Adorned Piercing and Jewellery Ltd | Other services | 2023 |
| Adrenaline Martial Arts - JT Ltd | Arts & recreation | 2025 |
| Advanced Eco Ltd | Construction | 2018 |
| Advancestake Property Management Limited | Households | 1987 |
| Aero Experience Ltd | Professional & scientific | 2013 |
| Aero Retail Ltd | Wholesale & retail | 2021 |
| Aerocycles (UK) Ltd | Wholesale & retail | 2014 |
| Affinity Growth Management Ltd | Administrative & support | 2020 |
| African Love Angels Ltd | Information & communication | 2024 |
| AG Fire Solutions Ltd | Administrative & support | 2014 |
| AGA Traders Limited | Transport & logistics | 2015 |
| Agdg Ltd | Other services | 2019 |
| Agri Business Limited | Other services | 1997 |
| Agri-Equestrian Limited | Professional & scientific | 1997 |
| Agritwin Intelligence Limited | Agriculture & fishing | 2026 |
| Airshot Services UK Ltd | Other services | 2022 |
| AJ Design Services Ltd | Professional & scientific | 2022 |
| AJB Property Investments Ltd | Construction | 2023 |
| Akin Car Detailing Ltd | Wholesale & retail | 2023 |
| AKS Maintenance and Repairs Ltd | Administrative & support | 2023 |
| Akshay Ltd | Health & social care | 2018 |
| Alexdival Ltd | Other services | 2018 |
| Alikanov Limited | Transport & logistics | 2025 |
| Alissa UK 2019 Ltd | Hospitality | 2019 |
| ALL Digital Solutions Limited | Manufacturing | 2008 |
| Allsopp Builderlife Ltd | Construction | 2026 |
| ALM Wholesale Limited | Administrative & support | 2017 |
| Alphatech Limited | Wholesale & retail | 1997 |
| AM Roofing and Scaffolding Limited | Construction | 2018 |
| Amazing Graphics Ltd | Other services | 2020 |
| Ambrosia Records Ltd | Information & communication | 2020 |
| Amhex Communications Limited | Information & communication | 2008 |
| Amir Estates Ltd | Real estate | 2018 |
| AMP Electrical (UK) Limited | Construction | 2007 |
| Anava Deep Tech Ventures Ltd | Professional & scientific | 2024 |
| Andana Care Limited | Health & social care | 2018 |
| Andrei JMA Ltd | Wholesale & retail | 2026 |
| Antler Properties Limited | Construction | 2007 |
| Antony Davis Limited | Real estate | 2023 |
| Anxiousparenthood Ltd | Information & communication | 2021 |
| AP Plastering & Screeding Ltd | Construction | 2014 |
| APC Interior Solutions Ltd | Construction | 2019 |
| Apex Biologics Consulting Ltd | Professional & scientific | 2019 |
| Apex Precision Engineering Ltd | Manufacturing | 2010 |
| Appeal My Rates UK Limited | Other services | 2019 |
| Approach Fire & Safety Limited | Other services | 2010 |
| APR Land and Property Limited | Real estate | 2024 |
| APR Retail Ltd | Wholesale & retail | 2015 |
| AQM Data Services Ltd | Professional & scientific | 2018 |