| A.G.C. Developments Limited | Construction | 2005 |
| A.K Fruit & VEG Ltd | Wholesale & retail | 2020 |
| A.L.K. Designs Limited | Other services | 2003 |
| A.N.A. Airline Management Ltd | Transport & logistics | 2010 |
| A.N.A. Aviation Group Holdings Ltd | Transport & logistics | 2010 |
| A.N.A. Aviation Services Limited | Transport & logistics | 1984 |
| A.S. Multisport Surfaces Limited | Construction | 2018 |
| A.V.A. Services Limited | Other services | 2003 |
| A.W.Stokes & Sons Limited | Professional & scientific | 2005 |
| A1 Fire Protection Ltd | Manufacturing | 2011 |
| A1 Fresh Ltd | Wholesale & retail | 2018 |
| A1 Property Lets Limited | Real estate | 2025 |
| A13 Airport Transfer Ltd | Transport & logistics | 2025 |
| A1KNOWLEDGE Ltd | Transport & logistics | 2021 |
| A1PHA Recovery Ltd | Transport & logistics | 2004 |
| A2 Engineering Ltd | Manufacturing | 2016 |
| A2B Bricklaying Ltd | Construction | 2023 |
| A2B Services Ltd | Information & communication | 2025 |
| A2Z Bookkeeping and Payroll Solutions Ltd | Professional & scientific | 2024 |
| A2Z Trades Movr Ltd | Wholesale & retail | 2023 |
| AA 247 Cars Limited | Transport & logistics | 2025 |
| AA Bookkeeping and Payroll Solutions Ltd | Professional & scientific | 2017 |
| AA Creative Ltd | Information & communication | 2025 |
| AA Mobility Services Limited | Transport & logistics | 2020 |
| AA Plus Construction Ltd | Construction | 2019 |
| Aacarsgatwick Ltd | Wholesale & retail | 2024 |
| Aaguard Ltd | Transport & logistics | 2020 |
| AAL Construction Ltd | Construction | 2017 |
| Aalim Associates Limited | Real estate | 2015 |
| Aamin Consultancy Ltd | Information & communication | 2022 |
| Aandlgoodwin Ltd | Administrative & support | 2023 |
| AAO Ventures Limited | Health & social care | 2018 |
| AAR Reliable Limited | Transport & logistics | 2024 |
| Aara Private Limited | Wholesale & retail | 2026 |
| Aaraiz Yaqoob Limited | Wholesale & retail | 2025 |
| Aaravpusloori Ltd | Professional & scientific | 2022 |
| Aarogyamantra Ltd | Administrative & support | 2017 |
| AAT Quality Care Agency Ltd | Health & social care | 2022 |
| Aavkar Foods Limited | Wholesale & retail | 2021 |
| Aavkar Investment Limited | Real estate | 2025 |
| AB & Purple DOT Limited | Wholesale & retail | 2022 |
| AB Electrical Solutions Ltd | Construction | 2023 |
| Abbotts Rise Management Company Limited | Households | 1994 |
| ABC Future Estates Limited | Real estate | 2026 |
| ABC Health Clinic Limited | Public administration | 2024 |
| Abdaan Commerce Ltd | Wholesale & retail | 2026 |
| Abendana’S Ltd | Manufacturing | 2024 |
| Abfall Group Ltd | Water & waste | 2021 |
| Abfall Waste Management Ltd | Water & waste | 2024 |
| Abien Properties Ltd | Real estate | 2017 |
| Able Bricks Ltd | Real estate | 2023 |
| ABN Foods Ltd | Hospitality | 2018 |
| ABR Transport Ltd | Transport & logistics | 2019 |
| Abracon UK Holding, Ltd. | Extraterritorial | 2021 |
| Absa Enterprise Ltd | Health & social care | 2020 |
| Absolute Booth Limited | Professional & scientific | 2019 |
| ABT Car Clinic Ltd | Wholesale & retail | 2021 |
| Aby-Joanne Photography Ltd | Professional & scientific | 2025 |
| AC Building Improvements Limited | Construction | 2024 |
| AC Cars Gatwick Limited | Transport & logistics | 2023 |
| AC Elite Gymnastics Ltd | Education | 2024 |
| AC Power Limited | Construction | 2005 |
| Acac Consulting Ltd | Professional & scientific | 2018 |
| Academy Accounting Partners Limited | Professional & scientific | 2026 |
| Access Garage Doors and Gates Limited | Extraterritorial | 1989 |
| Access Garage Doors Limited | Construction | 1976 |
| Access Holdings Limited | Extraterritorial | 2008 |
| Access Property Four Limited | Households | 2022 |
| Access Property One Ltd | Households | 2018 |
| Access Property Three Ltd | Households | 2021 |
| Access Property Two Ltd | Households | 2018 |
| Accessory Avenue Online Limited | Wholesale & retail | 2025 |
| Accident Specialists Crawley Ltd | Extraterritorial | 2010 |
| Accident Specialists Group Ltd | Extraterritorial | 2017 |
| Accolade Heating (UK) Limited | Construction | 2013 |
| Accountukm Business Advisory Limited | Professional & scientific | 2024 |
| Accph Ltd | Other services | 2025 |
| ACD IT Services Ltd | Professional & scientific | 2020 |
| Ace Auto and Mot's Ltd | Wholesale & retail | 2020 |
| Ace Careers Advice Ltd | Education | 2023 |
| Ace Infotech Limited | Information & communication | 2007 |
| Ace Marketing Solution Ltd | Transport & logistics | 2017 |
| Ace of Waste Ltd | Water & waste | 2017 |
| Ace Parking Limited | Transport & logistics | 2022 |
| Ace Rental Properties Ltd | Real estate | 2022 |
| Ace Spec Alloys Ltd | Wholesale & retail | 2024 |
| Aceline Global Holdings Limited | Administrative & support | 2023 |
| Aceline Global Limited | Wholesale & retail | 2013 |
| Aceso Health Ltd | Health & social care | 2025 |
| ACF Two Limited | Professional & scientific | 2023 |
| Acolyte Web Services Ltd | Professional & scientific | 2025 |
| Acorn Cars Gatwick Ltd | Transport & logistics | 2024 |
| Acorn Invest Ltd | Financial services | 2025 |
| Acorn Retail Ltd | Wholesale & retail | 2026 |
| Acquiesce Environmental Compliance Ltd | Professional & scientific | 2015 |
| ACR Trans Services Ltd | Transport & logistics | 2019 |
| Acscrawley Limited | Education | 2025 |
| ACT IT Solutions Ltd | Information & communication | 2023 |
| ACT Marketing Ltd | Professional & scientific | 2014 |
| Activate Event Management Ltd | Administrative & support | 2011 |