| A&Ac Ltd | Transport & logistics | 2015 |
| A&B Building Services Group Limited | Construction | 2025 |
| A&B Carpets Ltd | Construction | 2024 |
| A&B Kitchens Ltd | Construction | 2025 |
| A&C Multi Trade Construction Limited | Construction | 2026 |
| A&E Property Portfolio Ltd | Real estate | 2023 |
| A&G Vans Ltd | Wholesale & retail | 2024 |
| A&H Online Distributors Ltd | Wholesale & retail | 2024 |
| A&O Clothing Ltd | Wholesale & retail | 2023 |
| A&R Legacy Group Ltd | Financial services | 2026 |
| A&S Concepts Limited | Administrative & support | 2014 |
| A&V Car Sales Ltd | Wholesale & retail | 2021 |
| A&W Bricklaying and Construction Ltd | Construction | 2018 |
| A&W Property Ltd | Real estate | 2021 |
| A, S & G Carpentry and Maintenance Limited | Construction | 2018 |
| A-Mag Systems Limited | Manufacturing | 2003 |
| A. D. Projects Carpentry Ltd | Construction | 2008 |
| A. Luckes and SON (Removals & Storage) Ltd | Transport & logistics | 2012 |
| A. Roberts (Civil Engineering) Ltd | Wholesale & retail | 1977 |
| A.A.Rosati Ltd | Professional & scientific | 2012 |
| A.C.E. Landscapes Limited | Administrative & support | 2000 |
| A.E.M. Installations Limited | Information & communication | 2006 |
| A.I.H. Consulting Limited | Other services | 2022 |
| A.J Land Solutions Ltd | Construction | 2025 |
| A.J.Hunt Holdings Ltd | Real estate | 2019 |
| A.J.K. Electrical Services Ltd | Construction | 2025 |
| A.M Building Works Ltd | Construction | 2023 |
| A.M. Health & Safety Limited | Professional & scientific | 1997 |
| A.N.P Groundworks & Construction Ltd | Construction | 2025 |
| A.P.T HGV Ltd | Transport & logistics | 2022 |
| A.R.J Landscape Ltd | Administrative & support | 2010 |
| A.Randall Installations Ltd | Construction | 2020 |
| A.S. Trilux Ltd | Information & communication | 2015 |
| A1 Barber Shop Ltd | Other services | 2021 |
| A1 Carpentry & Construction Ltd | Construction | 2016 |
| A1 Cash and Carry Swindon Ltd | Wholesale & retail | 2020 |
| A1 Laundry Swindon Ltd | Other services | 2017 |
| A1 Manor Bodyshop Ltd | Wholesale & retail | 2019 |
| A1 Moses Services Ltd | Health & social care | 2019 |
| A1 Scaffolding (Wiltshire) Ltd | Construction | 2021 |
| A1 Snagging Ltd | Professional & scientific | 2024 |
| A1 Star Medicare Limited | Health & social care | 2022 |
| A2AIR Limited | Construction | 2023 |
| A2B Air Conditioning Ltd | Construction | 2014 |
| A2B Assured Move Ltd | Administrative & support | 2013 |
| A2B2 Limited | Health & social care | 2018 |
| A2Z Grocery Swindon Ltd | Wholesale & retail | 2018 |
| A3 Nova Limited | Wholesale & retail | 2025 |
| A77 Ltd | Administrative & support | 2020 |
| A7X Ltd | Real estate | 2007 |
| AA & MZ Properties Ltd | Real estate | 2021 |
| AA Cinema Limited | Information & communication | 2019 |
| AA Cleaning (Swindon) Ltd | Administrative & support | 2025 |
| AA Hand Car Wash Ltd | Other services | 2019 |
| AA Plumbing GAS Electrical Ltd | Construction | 2017 |
| AA2 Ltd | Administrative & support | 2017 |
| AAA Housing Estates Ltd | Real estate | 2024 |
| AAA RRR Limited | Hospitality | 2023 |
| AAA Shop Limited | Wholesale & retail | 2011 |
| Aadhikhola Oasis Ltd | Hospitality | 2025 |
| Aadi Birmingham Limited | Health & social care | 2019 |
| Aalin Professional Services Ltd | Administrative & support | 2024 |
| AAM Food & Beverage Limited | Hospitality | 2017 |
| Aama Property Ltd | Real estate | 2025 |
| Aarnya Ltd | Real estate | 2024 |
| AAT Technologies Ltd | Information & communication | 2018 |
| Aavieca Arch Ventures Ltd | Real estate | 2026 |
| AB Care Global Ltd | Health & social care | 2022 |
| AB Connections (South West) Limited | Construction | 2017 |
| AB Insure Ltd | Administrative & support | 2025 |
| AB Leadwork Limited | Construction | 2016 |
| Ab&M Plumbing & Building Services Ltd | Construction | 2013 |
| Ab-Fab Loos Limited | Administrative & support | 2003 |
| Abacus Accounting Services (North Wiltshire) Ltd | Professional & scientific | 2009 |
| Abacus Accounts (Thames Valley) Ltd | Extraterritorial | 2020 |
| Abacus Book-Keeping Company Limited | Professional & scientific | 2001 |
| Abacus Consultancy International Ltd | Administrative & support | 2024 |
| Abacus Property Management Thanet Limited | Households | 2022 |
| Abbey CAB Rentals Ltd | Transport & logistics | 2016 |
| Abbey Carpentry Ltd | Administrative & support | 2017 |
| Abbey Electrical (Swindon) Limited | Energy | 2012 |
| Abbey Euro Diesel Ltd | Financial services | 2007 |
| Abbey Fire and Security (Swindon) Limited | Administrative & support | 2018 |
| Abbey Funding, Ltd | Financial services | 2025 |
| Abbey Glass & Windows Limited | Construction | 2024 |
| Abbey Group Holdco Limited | Financial services | 2026 |
| Abbey Group Services Limited | Financial services | 2018 |
| Abbey Group Trustee Limited | Financial services | 2026 |
| Abbey House Malmesbury Limited | Real estate | 2020 |
| Abbey Meads Occupational Health Services Limited | Health & social care | 2006 |
| Abbey Radio Cars Limited | Extraterritorial | 2001 |
| Abbey Renewables Ltd | Construction | 2023 |
| Abbey Rider Training Limited | Education | 2003 |
| Abbey Ridge Limited | Professional & scientific | 2016 |
| Abbey ROW Malmesbury Limited | Real estate | 2021 |
| Abbey Scaffolding (Swindon) Limited | Construction | 1999 |
| Abbey Taxis (Swindon) Limited | Transport & logistics | 2007 |
| Abbey Tyres Ltd | Wholesale & retail | 2023 |
| Abbeymead Plumbing and Heating Ltd | Construction | 2025 |
| Abbsolut Ltd | Information & communication | 2010 |