| 10 Heene Terrace RTM Company Ltd | Extraterritorial | 2014 |
| 134 Finborough Road Limited | Hospitality | 2004 |
| 1ST Group Property Ltd | Real estate | 2023 |
| 1X2 Consulting Ltd | Information & communication | 2023 |
| 2 Linden Close Ltd | Real estate | 2020 |
| 2 Love Properties Limited | Hospitality | 2022 |
| 21 at 12 Ltd | Information & communication | 2022 |
| 21 Bridge Street Chepstow Management Company Limited | Real estate | 1994 |
| 30 Petherton Road Management Company Limited | Households | 1998 |
| 31 Ditchling Rise Management Company Ltd | Households | 2022 |
| 5OF12 LLP | | 2024 |
| 8 West Mall (BS8) Limited | Real estate | 1987 |
| A &J Rubbish Removals Ltd | Water & waste | 2025 |
| A B Electrical (Chepstow) Ltd | Construction | 2011 |
| A C I Training & Consultancy Ltd | Administrative & support | 2011 |
| A Design on Life Ltd | Wholesale & retail | 2010 |
| A Kingdom in Chaos Ltd | Information & communication | 2024 |
| A Little Chatter Ltd | Hospitality | 2024 |
| A Ship Through Time Ltd | Information & communication | 2024 |
| AB Security Consulting Limited | Professional & scientific | 2025 |
| ABE Logistic & Business UK Limited | Wholesale & retail | 2023 |
| Abodes Well Limited | Real estate | 2007 |
| Abrabrook Limited | Real estate | 2001 |
| Accountant Services 4 U Ltd | Professional & scientific | 2022 |
| Ace Accounts & Bookkeeping Services Limited | Professional & scientific | 2010 |
| Acer Design and Build Ltd | Construction | 2022 |
| ACI Contracting Ltd | Manufacturing | 2022 |
| ACL Enterprises Limited | Health & social care | 2004 |
| Acuity Translations Limited | Administrative & support | 2014 |
| ACW Properties Limited | Agriculture & fishing | 1983 |
| Adept Consulting (UK) Ltd | Professional & scientific | 2008 |
| Adept Structural Solutions (UK) Ltd | Construction | 2017 |
| Adjudix Limited | Professional & scientific | 2024 |
| Adrs Logistics Ltd | Transport & logistics | 2024 |
| Aegis Mechanical & Electrical Engineering Limited | | 1989 |
| Aeon INT Limited | Professional & scientific | 2016 |
| Aerowash Drones Ltd | Administrative & support | 2024 |
| Aesthetic Business Partners LLP | | 2013 |
| Agile Programmes Limited | Information & communication | 2015 |
| Ahimsa Associates Limited | Administrative & support | 2010 |
| Aisi DEV Co. Ltd | Information & communication | 2025 |
| AJ Tensile Biogas Systems Limited | Construction | 2025 |
| Aker Aviation Ltd | Administrative & support | 2019 |
| AKR IT Solutions Ltd | Information & communication | 2025 |
| Alan Boyle Construction Ltd | Construction | 2026 |
| Albion House Hair Salon Limited | Other services | 2013 |
| ALJ Engineering Services Ltd | Professional & scientific | 2024 |
| ALL Things Tortoise Limited | Wholesale & retail | 2021 |
| Allan Fuller Limited | Manufacturing | 1951 |
| Alliance QA Services Limited | Professional & scientific | 2000 |
| Allorjenn Limited | Construction | 2015 |
| ALP Synergy Limited | Professional & scientific | 2014 |
| Alphacoder Limited | Information & communication | 2025 |
| Altered State Talks Ltd | Arts & recreation | 2023 |
| Aluk (GB) Limited | Manufacturing | 1993 |
| Alvan Limited | Construction | 2013 |
| ALW Properties Limited | Construction | 2025 |
| Alwaystheother Limited | Information & communication | 2022 |
| Amazing Alpacas Ltd | Agriculture & fishing | 2004 |
| Amena Services Ltd | Construction | 2014 |
| Amity Partnership Limited | Professional & scientific | 2019 |
| Andrew Colthart Homes Ltd | Construction | 2020 |
| Angle Construction Consultants Ltd | Construction | 2014 |
| Anna Verhamme Consulting Ltd | Education | 2019 |
| Anstey SIS Ltd | Real estate | 2024 |
| ANY Occasion Event Hire UK Ltd | Hospitality | 2021 |
| AOD Education Ltd | Education | 2022 |
| AP Auto Services Ltd | Administrative & support | 2023 |
| Aplus Pestcontrol & Drain Solutions Limited | Agriculture & fishing | 2025 |
| Aquavida Limited | Water & waste | 2002 |
| Arbe Limited | Professional & scientific | 2025 |
| Arcana Solutions (UK) Limited | Administrative & support | 2010 |
| Architen Landrell Group Limited | Financial services | 2019 |
| Architen Limited | Manufacturing | 1986 |
| Archway Veterinary Centre Limited | Professional & scientific | 2016 |
| Ardent Consulting Solutions Limited | Administrative & support | 2013 |
| Ares International Holdings Limited | Administrative & support | 2022 |
| Arfa Treasure Ltd | Extraterritorial | 2021 |
| ARK Illustration Limited | Information & communication | 2025 |
| Arkon Projects Ltd | Construction | 2026 |
| Artee Ltd | Manufacturing | 2026 |
| Artisan Property Services Ltd | Real estate | 2018 |
| Artisan Visual Effects Ltd | Administrative & support | 2013 |
| ASC Management Limited | Professional & scientific | 2006 |
| ASC Phillips Limited | Transport & logistics | 2025 |
| Ashrr Ltd | Information & communication | 2019 |
| ASL Motors Ltd | Wholesale & retail | 2024 |
| Assure Holdings Limited | Health & social care | 2015 |
| Assure SES Limited | Extraterritorial | 2019 |
| Asta Solutions Limited | Water & waste | 2010 |
| Aston Creative Limited | Information & communication | 2006 |
| Athena Print Media Limited | | 2007 |
| Attainable Associates Ltd | Professional & scientific | 2012 |
| August Three Investment Ltd | Financial services | 2015 |
| August Three Trading Ltd | Real estate | 2026 |
| Aura Seren Limited | Information & communication | 2025 |
| Automacaw Ltd | Wholesale & retail | 2023 |
| AV1 Properties Ltd | Real estate | 2024 |
| Avail Construction Services Ltd | Construction | 2025 |
| Avalon Ecology Ltd | Professional & scientific | 2014 |