| Atri Automotive Ltd | Wholesale & retail | 2026 |
| Atri Projects Ltd | Real estate | 2025 |
| Attention UK Limited | Other services | 2009 |
| Attwood Developments Limited | Real estate | 1983 |
| Atukorala Holdings Limited | Wholesale & retail | 2024 |
| Audlem and District Community Action | Health & social care | 2011 |
| Audlem Online Limited | Information & communication | 2023 |
| Augmentas Group Holdings Ltd | Financial services | 2021 |
| Aura Pilates Studio Limited | Arts & recreation | 2025 |
| Aura WEF Ltd | Wholesale & retail | 2026 |
| Aurel & Liliana Ltd | Transport & logistics | 2025 |
| Auriga Advocates Ltd | Professional & scientific | 2014 |
| Authentic Solutions (UK) Ltd | Professional & scientific | 2007 |
| Autism Networks (A.N) | Information & communication | 2010 |
| Auto Fault Finder Ltd | Wholesale & retail | 2021 |
| Auto File Service Limited | Wholesale & retail | 2015 |
| Auto Focus Car Care Limited | Wholesale & retail | 2014 |
| Auto Focus Car Sales Ltd | Wholesale & retail | 2021 |
| Auto Lender Ltd | Financial services | 2024 |
| Auto Smart Restore Ltd | Wholesale & retail | 2024 |
| Auto Tech Crewe Limited | Wholesale & retail | 2026 |
| Auto Test Engineering Limited | Professional & scientific | 2025 |
| Autolex Garages Ltd | Wholesale & retail | 2026 |
| Autolex Motors Limited | Wholesale & retail | 2017 |
| Automotive Recruitment and Consultancy Services Ltd | Administrative & support | 2019 |
| Autosrevived Ltd | Wholesale & retail | 2009 |
| AVA Investments U.K. Ltd. | Real estate | 2019 |
| AVA Rose Barker Ltd | Transport & logistics | 2018 |
| AVA Rose Barker Properties Ltd | Real estate | 2019 |
| AVEC0 Limited | Construction | 2025 |
| Aviana Health Care Ltd | Health & social care | 2020 |
| Aviary Holdings Ltd | Financial services | 2020 |
| Avitech Limited | Extraterritorial | 1996 |
| Avocet Battery Materials Limited | Manufacturing | 2020 |
| Avocet Steel LLP | | 2011 |
| Avocet Steel Strip Limited | Other services | 1996 |
| Avosoft Limited | Information & communication | 2015 |
| Avostoke Limited | Real estate | 2026 |
| Avram Ltd | Transport & logistics | 2021 |
| AVT Medicare Ltd | Health & social care | 2015 |
| AVT Property Investments Ltd | Real estate | 2023 |
| Awdr Developments Limited | Construction | 2020 |
| AWL Construction (N/W) Limited | Construction | 2021 |
| AWL Holdings (N/W) Ltd | Financial services | 2025 |
| AWM Holdings Limited | Financial services | 2026 |
| AWS Groundworks Ltd | Construction | 2022 |
| AWS Plant Hire Ltd | Administrative & support | 2026 |
| Axel Harper Ltd | Real estate | 2026 |
| Axiom AI Systems Ltd | Professional & scientific | 2026 |
| Axis Boats UK Limited | Manufacturing | 2012 |
| Axxa Ltd | Manufacturing | 2010 |
| Ayaans Indian Takeaway (Crewe) Ltd | Hospitality | 2025 |
| Aycliffe Properties Ltd | Real estate | 2017 |
| Aymies Ltd | Arts & recreation | 2023 |
| AZ Technologies Ltd | Information & communication | 2024 |
| Azoria Capital (6) Limited | Financial services | 2024 |
| Azoria Consulting Limited | Professional & scientific | 2023 |
| Aztec Aerosols Limited | Manufacturing | 1983 |
| Aztec Chemicals Limited | Wholesale & retail | 1989 |
| Aztec Fleet Management Limited | Administrative & support | 1964 |
| Aztec Industries Limited | Professional & scientific | 1989 |
| B C Estates Group Limited | Real estate | 2009 |
| B C Inns Limited | Hospitality | 2003 |
| B Darlington Builders Limited | Construction | 2025 |
| B E B Drainage Limited | Water & waste | 2019 |
| B E B Property Services Limited | Administrative & support | 1999 |
| B Goodwin Builders Limited | Construction | 2004 |
| B Live Limited | Information & communication | 2025 |
| B Price Building Contractors Limited | Construction | 2002 |
| B&S Logistic Limited | Wholesale & retail | 2016 |
| B-Manga Ltd | Transport & logistics | 2021 |
| B.S. Parker & Family LLP | | 2023 |
| B2 Building Contractors Limited | Construction | 2015 |
| B2 Groundworks & Civils Ltd | Construction | 2023 |
| B2 Properties (Stoke) Ltd | Real estate | 2017 |
| B2B Partnering Performance Management Ltd | Professional & scientific | 2008 |
| Baab Doors Ltd | Construction | 2025 |
| Baby GAL Store Limited | Wholesale & retail | 2025 |
| Baby Glimpse 3D/4D Ultrasound Ltd | Health & social care | 2021 |
| BAG a Winner Limited | Other services | 2024 |
| BAG Supplies Ltd | Extraterritorial | 2000 |
| Bailey Family Estates Limited | Real estate | 2020 |
| Bailey Family Group Limited | Financial services | 2020 |
| Bailey’S Wine & Deli Ltd | Wholesale & retail | 2025 |
| Bairam Ltd | Transport & logistics | 2025 |
| Baldwins Plant Hire Limited | Administrative & support | 2024 |
| Ballantyne Construction Limited | Construction | 2015 |
| Balloon Marketing Limited | Professional & scientific | 2025 |
| Ballucci Cheshire Limited | Wholesale & retail | 2021 |
| Balterley Court Management Company Limited | Real estate | 2003 |
| Balterley Green Management Limited | Households | 2006 |
| Balterley Transport and Training Limited | Education | 2012 |
| Bandit Bandeja Ltd | Wholesale & retail | 2026 |
| Banjo Homes Ltd | Real estate | 2024 |
| Bank Farm Barns Management Company Limited | Households | 2009 |
| Banks Sheridan Limited | Professional & scientific | 2002 |
| Banks Sheridan Wealth Limited | Financial services | 2021 |
| Bar Hill Dairies Limited | Agriculture & fishing | 2016 |
| Bar Hill Sporting (Doddington) Limited | Arts & recreation | 2025 |
| Bar Hill Sporting Ltd | Arts & recreation | 2022 |