| Androcons Ltd | Professional & scientific | 2019 |
| Anemo Music Ltd | Information & communication | 2007 |
| ANG Garden Contractors Limited | Administrative & support | 2022 |
| Anglo Canadian Holdings Limited | Information & communication | 2018 |
| Annan School Limited | Education | 2014 |
| Anthony Budd Vineyards LLP | | 2006 |
| Antique Clock & Watch Repairs Ltd | Wholesale & retail | 2023 |
| Antique Jewellery London Limited | Wholesale & retail | 2022 |
| APB Painting and Decorating Ltd | Construction | 2026 |
| Apeiron Coaching Ltd | Other services | 2017 |
| Apex Vitals International Ltd | Financial services | 2022 |
| Appic Ltd | Information & communication | 2014 |
| AR Vision-Euro Technology Ltd | Information & communication | 2018 |
| Arboretum Holdings Limited | Financial services | 2017 |
| ARC Projects Investments LLP | | 2017 |
| ARC Property Limited | Real estate | 2018 |
| Archaeodiscovery Ltd | Education | 2020 |
| Ardfern Group Ltd | Professional & scientific | 2020 |
| Ardross Consultancy Ltd | Professional & scientific | 2022 |
| Arnex Heavy Plant Ltd | Information & communication | 2025 |
| Aroma Cafe Uckfield Ltd | Hospitality | 2024 |
| Arrow Survey Consultants Ltd | Professional & scientific | 2020 |
| Artit Ltd | Information & communication | 2018 |
| Arva Property Services Ltd | Construction | 2014 |
| ASC Global International Ltd | Wholesale & retail | 2012 |
| Ascan Ltd | Hospitality | 2022 |
| ASH Technical Holdings Ltd | Financial services | 2023 |
| Asha Healthcare Systems Ltd | Professional & scientific | 2010 |
| Ashdene Garage Limited | Wholesale & retail | 2008 |
| Ashdown Consultant Engineers Ltd. | Construction | 1987 |
| Ashdown Flooring Ltd | Wholesale & retail | 2023 |
| Ashdown Forest Open Studios CIC | Arts & recreation | 2026 |
| Ashdown Moving Group LLP | | 2015 |
| Ashdown Plant & Sales Southern Ltd | Manufacturing | 2021 |
| Ashdown Radio Limited | Information & communication | 2007 |
| Ashdown Traders Limited | Information & communication | 2007 |
| Ashford Colour Limited | Manufacturing | 2024 |
| Ashford UK Property Limited | Real estate | 2020 |
| Ashgrove Farm Garage Ltd | Wholesale & retail | 2025 |
| Ashley Green (Aspire) Investments Limited | Administrative & support | 2019 |
| Ashley Green Holdings Limited | Administrative & support | 2019 |
| Ashley Green Limited | Other services | 2019 |
| Ashley Taylors Agencies Limited | Professional & scientific | 1991 |
| Ashley Taylors Legal Limited | Professional & scientific | 2013 |
| Ashley Taylors Limited | Administrative & support | 1999 |
| Ashok Narayanasamy Limited | Health & social care | 2017 |
| ASI Property Ltd | Real estate | 2021 |
| ASJ Associates Ltd | Education | 2023 |
| ASL Training & Consultancy Limited | Professional & scientific | 2024 |
| ASM Carpets & Wood Flooring Specialists Limited | Construction | 2007 |
| Aspect Home Improvements Ltd | Construction | 2025 |
| Asset Handle Ltd | Financial services | 2016 |
| Association of Community and Multibed Acupuncture Clinics, C.I.C. | Health & social care | 2013 |
| Association of Mental Health Leads Ltd | Administrative & support | 2019 |
| Astrl Ltd | Wholesale & retail | 2026 |
| Astse Limited | Real estate | 2020 |
| Astute AI Ltd | Information & communication | 2023 |
| Athlo App Ltd | Information & communication | 2018 |
| Atkin Clothing Limited | Wholesale & retail | 2026 |
| Atlantic Equity Holding Limited | Financial services | 2019 |
| Atterbury Associates Limited | Professional & scientific | 1996 |
| Attwell Monks Ltd | Agriculture & fishing | 2021 |
| Aureus Consultancy Limited | Financial services | 2012 |
| Aussieproperties Ltd | Real estate | 2024 |
| Austin RAY Creative Limited | Wholesale & retail | 2020 |
| Automatic Test Services Limited | Manufacturing | 1989 |
| Avanda Ltd | Professional & scientific | 2023 |
| AVD Consultancy Limited | Professional & scientific | 2025 |
| Aviasill Ltd | Transport & logistics | 2023 |
| Awaken Radiant Sun Limited | Education | 2007 |
| Awash With Dogs Ltd | Other services | 2021 |
| Awoart Joinery Ltd | Manufacturing | 2019 |
| Aworth Land Surveys Limited | Professional & scientific | 1967 |
| Aworth Realisations | Extraterritorial | 1963 |
| AWS Product Consulting Ltd | Wholesale & retail | 2022 |
| Ayrton Lewes Ltd | Real estate | 2025 |
| Azzopardi Developments Ltd | Real estate | 2025 |
| B & R Page Limited | Wholesale & retail | 2015 |
| B M Nesbitt Heating Ltd | Construction | 2019 |
| B.G. Benton Limited | Wholesale & retail | 1975 |
| Ba-Pan Ltd | Financial services | 2021 |
| Babanango's Limited | Hospitality | 2014 |
| Babele Software Limited | Information & communication | 2018 |
| Babylon Eco Centre Ltd | Agriculture & fishing | 2023 |
| Back on Track Clinic Limited | Health & social care | 2011 |
| Ballooning Lovely Ltd | Arts & recreation | 2018 |
| Balogh Engineering Consultants Limited | Professional & scientific | 2012 |
| Bambu Beauty Ltd | Wholesale & retail | 2019 |
| Barham Estates Limited | Construction | 1957 |
| Barkers and Bath Ltd | Wholesale & retail | 2017 |
| Barnard & Hoad Glazing Limited | Construction | 2003 |
| Barrotts & Booth Ltd | Construction | 2021 |
| Bartrender Ltd | Hospitality | 2014 |
| Bathe in Safety Limited | Manufacturing | 2014 |
| Baymead Limited | Construction | 2003 |
| BB Network Ltd | Information & communication | 2018 |
| Be&Bb Ltd | Financial services | 2022 |
| Beacon Print Limited | Manufacturing | 2005 |
| Beaconfield House Limited | Households | 1981 |
| Beagle Medical Limited | Manufacturing | 2026 |