| 1 Hornes Homes Limited | Construction | 2008 |
| 1 Stop Tyre & Service Centre Ltd | Wholesale & retail | 2015 |
| 1 to 5 Stays Ltd | Real estate | 2026 |
| 10 Construction Services Limited | Administrative & support | 2026 |
| 14 Abbey Terrace West Cliff Limited | Real estate | 2004 |
| 1ST Benchmark Limited | Construction | 2018 |
| 2. Bahar Ltd | Wholesale & retail | 2021 |
| 222 Kouture Hair Ltd | Other services | 2025 |
| 24/7 Delivery Ltd | Transport & logistics | 2025 |
| 24HR Healthcare Staffing Agency Ltd | Professional & scientific | 2017 |
| 25-31 Wetherby Drive Freehold Company Limited | Households | 2025 |
| 3B Consultants Ltd | Construction | 2011 |
| 3G Controls Limited | Construction | 2005 |
| 3III Enterprise Community Interest Company | Education | 2019 |
| 3III Training Limited | Education | 2017 |
| 4 Smart Services Ltd | Construction | 2011 |
| 5 Savours Limited | Hospitality | 2024 |
| 51KM Limited | Manufacturing | 2023 |
| A & D Fabrications UK Limited | Manufacturing | 2006 |
| A & J Industrial Pipe Services Ltd | Construction | 2013 |
| A & S Marketing Solutions Limited | Wholesale & retail | 2004 |
| A Cowley Holdings Ltd | Financial services | 2021 |
| A D T Decor Limited | Construction | 2015 |
| A Knight Antiques Ltd | Wholesale & retail | 2013 |
| A Star Roofing Specialists & Property Maintenance Ltd | Construction | 2018 |
| A Star Roofing Supplies Ltd | Wholesale & retail | 2020 |
| A to Z Core Ltd | Wholesale & retail | 2025 |
| A W GAS and Renewables Ltd | Construction | 2023 |
| A&J Courier Services Ltd | Transport & logistics | 2016 |
| A&M JAP Ltd | Wholesale & retail | 2025 |
| A&N Carriage Limited | Transport & logistics | 2021 |
| A&O Trans Ltd | Transport & logistics | 2024 |
| A-Craft Scaffolding Limited | Construction | 2022 |
| A. Cowley & Sons Limited | Administrative & support | 1995 |
| A. J. Beamish Electrical Contractors Limited | Construction | 2004 |
| A.D.H. Flooring Limited | Construction | 2007 |
| A.G.E Builders Ltd | Construction | 2026 |
| A.G.S Eco Ltd | Construction | 2026 |
| A.P.E (Alternative Programme Education) | Education | 2012 |
| A.P.G Services and Solutions Ltd | Construction | 2026 |
| Aaradhana Limited | Real estate | 2025 |
| AB Atelier Ltd | Wholesale & retail | 2024 |
| AB Fade Ltd | Other services | 2026 |
| Abbey Court Nursing and Residential Homes Limited | Health & social care | 1986 |
| Above & Beyond Roofing & Building Ltd | Construction | 2025 |
| Absdglobal Ltd | Wholesale & retail | 2025 |
| Abson Electrical Limited | Construction | 2012 |
| AC Moore Properties Ltd | Real estate | 2025 |
| Academy Salon With Emma Ward Ltd | Other services | 2025 |
| Academy Training With Emma Ward Ltd | Other services | 2025 |
| Access & Platform Lifts Ltd | Wholesale & retail | 2011 |
| Accessgb Ltd | Construction | 2025 |
| Ace Innovation Limited | Administrative & support | 2012 |
| ACF Mortgages Limited | Financial services | 2016 |
| Acjt Property Group Ltd | Real estate | 2024 |
| Acorn Community Theatre Limited | Arts & recreation | 2005 |
| Action Estates Limited | Real estate | 2016 |
| Acwts Ltd | Professional & scientific | 2026 |
| AD Infinitum Portfolio Limited | Real estate | 2025 |
| Adam Ellis Tutorials Ltd | Arts & recreation | 2017 |
| Adam Guirdham Properties Trading Ltd | Real estate | 2022 |
| Adam Hallowes Properties Limited | Real estate | 2023 |
| Adaptive Change Limited | Extraterritorial | 2024 |
| ADB Trading Ltd | Other services | 2019 |
| Adblue Power Solutions Ltd | Manufacturing | 2023 |
| Adderson Limited | Transport & logistics | 2015 |
| Adjust Recruitment Limited | Administrative & support | 2024 |
| ADM Windows Limited | Manufacturing | 2013 |
| Admin-Shed Ltd | Administrative & support | 2025 |
| ADP Therapy Limited | Other services | 2024 |
| Adrianjknight Limited | Professional & scientific | 2015 |
| ADT Building Services Ltd | Construction | 2010 |
| Advanced Adolescent Care Solutions Limited | Health & social care | 2018 |
| Advanced Adolescent Support Limited | Health & social care | 2018 |
| Advanced Cleaning Solutions Exterior Ltd | Administrative & support | 2025 |
| Advanced Micro Systems Limited | Information & communication | 1995 |
| Advanced Smart Repairs Ltd | Wholesale & retail | 2026 |
| Adventure Trading UK Ltd | Wholesale & retail | 2016 |
| ADW Mechanical Site Services Limited | Professional & scientific | 2015 |
| AFC Fried & Peri Peri Chicken Ltd | Hospitality | 2024 |
| AFH Holdco Limited | Financial services | 2021 |
| AG Home and Property Limited | Households | 2025 |
| AG Sports Coaching Academy Ltd | Arts & recreation | 2022 |
| Agglite Limited | Manufacturing | 2013 |
| Agil Limited | Extraterritorial | 2007 |
| Agio Properties Ltd | Real estate | 2013 |
| Agro Produce UK Limited | Manufacturing | 2011 |
| AH Healthcare Consulting Ltd | Health & social care | 2023 |
| Ahblyth Limited | Hospitality | 2024 |
| AHD Renewal Limited | Real estate | 2021 |
| Ahmeds Leathers Ltd | Wholesale & retail | 2008 |
| Aidee Edtech Ltd | Information & communication | 2023 |
| Aishany Ltd | Real estate | 2020 |
| AJ Electrical & Renewables Ltd | Construction | 2025 |
| AJC Ventures Ltd | Financial services | 2023 |
| AJR Cars Ltd | Wholesale & retail | 2017 |
| AJS Property Development Limited | Real estate | 2000 |
| AJT Safety Group Ltd | Manufacturing | 2015 |
| AK & Sons Bespoke Joinery Ltd | Construction | 2023 |
| AK Flowers Ltd | Wholesale & retail | 2023 |