| 108-114 Seager Drive RTM Company Ltd | Administrative & support | 2013 |
| 10TWENTY2 Limited | Information & communication | 2003 |
| 123 Middleton Road Management Company Limited | Real estate | 2007 |
| 2 Handymen LLP | | 2016 |
| 20 Manor Park Ltd | Real estate | 2025 |
| 343 and 345 Harrow View Limited | Professional & scientific | 2008 |
| 360 Asset Finance Limited | Financial services | 2007 |
| 360 Cranes Limited | Manufacturing | 2023 |
| 3BS Radio CIC | Information & communication | 2022 |
| 3OCTO Project Ltd | Professional & scientific | 2023 |
| 4 Redcliffe Street Freehold Limited | Real estate | 2011 |
| 4 Sight Systems Limited | Administrative & support | 2003 |
| 4 U 2 Store Limited | Hospitality | 2011 |
| 42 Consultancy Limited | Administrative & support | 2015 |
| 4D Solutions Limited | Information & communication | 2004 |
| 4LA Consults Ltd | Other services | 2025 |
| 5280 Classics Ltd | Wholesale & retail | 2016 |
| 5A Lambodra Limited | Professional & scientific | 2026 |
| 6 C Luxe Design Ltd | Arts & recreation | 2011 |
| 60 Bramber Road Limited | Households | 1998 |
| 64 South Terrace Limited | Real estate | 2012 |
| 67 Woodside Ltd | Real estate | 2019 |
| 6F Proactive Engineering and Management Ltd | Professional & scientific | 2025 |
| 7 Star Management Services Ltd | Professional & scientific | 2020 |
| 9RP Limited | Real estate | 2012 |
| A & J Kitchens Ltd | Construction | 2014 |
| A & R Woodworking Company Oxfordshire Limited | Manufacturing | 2014 |
| A Awan Services Limited | Real estate | 2017 |
| A Buckland & Sons Ltd | Wholesale & retail | 2012 |
| A Dimensional Property Ltd | Real estate | 2025 |
| A H R Motorsport Services Ltd | Professional & scientific | 2016 |
| A M Cater Landscaping Limited | Administrative & support | 1997 |
| A Verify Solutions Limited | Information & communication | 2025 |
| A&A Wright Homes Ltd | Real estate | 2022 |
| A&D Quality Property Limited | Transport & logistics | 2024 |
| A.I.Conic Ltd | Information & communication | 2026 |
| A.M. Equestrian Services Limited | Agriculture & fishing | 2025 |
| Aardvark Design Services Limited | Professional & scientific | 2017 |
| Abbeywood Removals Limited | Transport & logistics | 2023 |
| Abedhya Limited | Health & social care | 2025 |
| Absolute Films Limited | Professional & scientific | 2012 |
| Abyb Consultancy Ltd | Professional & scientific | 2024 |
| AC Business Development LLP | | 2012 |
| ACB Consulting Limited | Professional & scientific | 2010 |
| Acclaim Home Improvements Limited | Construction | 1985 |
| Accommodation Consultancy Ltd | Real estate | 2019 |
| Acqua Surveying Ltd | Administrative & support | 2011 |
| AD Diagnostics Limited | Extraterritorial | 2025 |
| Adam Clarke Communications Ltd | Professional & scientific | 2022 |
| Adams Cundell Engineers Limited | Manufacturing | 1973 |
| Adams Cundell Holdings Limited | Administrative & support | 2015 |
| Addington Events Ltd | Arts & recreation | 2025 |
| Adept Roofing & Scaffolding Contractors Limited | Construction | 2019 |
| Adma Holdings Limited | Professional & scientific | 2016 |
| ADP Wines Ltd | Wholesale & retail | 2007 |
| Adrenalin Trading Limited | Financial services | 2022 |
| AEC Enterprises Limited | Administrative & support | 2020 |
| Aeneas International Ltd | Wholesale & retail | 2020 |
| Aenso UK Limited | Wholesale & retail | 2024 |
| Aero Advance Ltd | Administrative & support | 2020 |
| AES Maintenance Services Limited | Manufacturing | 2007 |
| Aesthetics by Rebecca LEE Ltd | Health & social care | 2025 |
| Afrik Food Ltd | Administrative & support | 2017 |
| Afro Combo Ltd | Hospitality | 2023 |
| AG Ventures Limited | Financial services | 2018 |
| AGL Enterprise Ltd | Real estate | 2021 |
| Agronomic Ltd | Construction | 2015 |
| Ah&G Food Ltd | Hospitality | 2019 |
| Ahen Properties Limited | Real estate | 2022 |
| AHS Catering Services Ltd | Hospitality | 2018 |
| AI Pulse Ltd | Information & communication | 2022 |
| AIB Properties Ltd | Construction | 2021 |
| Air Digital Limited | Extraterritorial | 2011 |
| Aircell Structures Limited | Manufacturing | 2005 |
| Aironic Limited | Construction | 2022 |
| AJ Installations Limited | Construction | 2024 |
| AJL Electrical Contractors Ltd | Construction | 2011 |
| AJR & Co Accountancy Limited | Professional & scientific | 2024 |
| Akeley Business Coaching Limited | Professional & scientific | 2024 |
| Akeman Projects Ltd | Information & communication | 2013 |
| Akks Private Tuition and Education Consultancy Limited | Education | 2021 |
| AKN Enterprises Limited | Financial services | 2024 |
| Aksom Carpentry Limited | Construction | 2026 |
| Albatross Air Limited | Transport & logistics | 1998 |
| Albion ROW Management Company Limited | Households | 2011 |
| ALE Consulting Group Ltd | Professional & scientific | 2024 |
| Alexander Muirhead Limited | Financial services | 2023 |
| Alfdot Ventures Ltd | Health & social care | 2018 |
| Alithen Ltd | Health & social care | 2016 |
| Allstar Windows and Doors Limited | Construction | 2020 |
| ALO Emre 27 Ltd | Hospitality | 2024 |
| Alpha Garage Equipment Ltd | Wholesale & retail | 2017 |
| Alpha-Rains Care Ltd | Health & social care | 2023 |
| Alpina Construction Ltd | Construction | 2009 |
| Alpine Management Services Rentals Limited | Administrative & support | 1997 |
| Alse International Limited | Manufacturing | 2010 |
| ALT Asset Finance Limited | Financial services | 2002 |
| Altamira Technologies (UK) Ltd | Information & communication | 2021 |
| Amanda Austin Flowers Ltd | Wholesale & retail | 2003 |
| Ambassador Estates Limited | Real estate | 2000 |