| A&E Life Support Ltd | Health & social care | 2012 |
| A&E Support Ltd | Health & social care | 2018 |
| A&J Rahman Properties Ltd | Real estate | 2025 |
| A&P Motorcare Limited | Wholesale & retail | 2019 |
| A&S Project Services Ltd | Construction | 2019 |
| A&S Value Mart Ltd | Wholesale & retail | 2025 |
| A&T Couriers Ltd | Transport & logistics | 2021 |
| A&T Joinery Services Ltd | Construction | 2021 |
| A-Dale Limited | Real estate | 2025 |
| A-S Solar SPV1 Limited | Energy | 2025 |
| A. V. Construction West Midlands Limited | Construction | 2017 |
| A. Venning Limited | Construction | 1982 |
| A.D.B Project Consulting Limited | Professional & scientific | 2012 |
| A.D.B Property Management Limited | Real estate | 2016 |
| A.J.S. Group 2020 Limited | Financial services | 2020 |
| A.J.S. Precision Engineering Limited | Professional & scientific | 2007 |
| A.K.H. Limited | Professional & scientific | 2015 |
| A.M. Strafford and Sons Limited | Manufacturing | 1980 |
| A.M.S INT Furniture Installations Ltd | Construction | 2020 |
| A.N.Y. Accounting and Bookkeeping Services Ltd | Professional & scientific | 2019 |
| A.R.D.Autobodies Ltd | Wholesale & retail | 2014 |
| A.W.E.P. Services Ltd | Transport & logistics | 2017 |
| A1 4X4 Breakers Limited | Wholesale & retail | 2021 |
| A1 Fitness Studios Limited | Other services | 2009 |
| A1 Krystal Clean Limited | Administrative & support | 2018 |
| A2B Works Ltd | Transport & logistics | 2018 |
| A2DH Limited | Other services | 2025 |
| A6 Lettings Ltd | Real estate | 2014 |
| AA 1ST Windscreens Ltd | Wholesale & retail | 2015 |
| AA Panda Properties Ltd | Real estate | 2026 |
| AA94 Ltd | Health & social care | 2018 |
| AAA Auto Services Limited | Wholesale & retail | 2011 |
| AAA Automotive Ltd | Wholesale & retail | 2014 |
| AAA Technology Limited | Information & communication | 2016 |
| AAC Physiotherapy (Spinal and Sports Injury Clinic) Limited | Health & social care | 2007 |
| AAH Beauty Consultancy Services Limited | Wholesale & retail | 2022 |
| Aaira Retail Ltd | Wholesale & retail | 2025 |
| Aanjaneya Estates Ltd | Real estate | 2024 |
| Aayan Takeaway Ltd | Hospitality | 2019 |
| AB & SON Groundworks Ltd | Construction | 2021 |
| AB Graphx Limited | Wholesale & retail | 2021 |
| AB Orthodontics Limited | Health & social care | 2021 |
| AB1GK Limited | Arts & recreation | 2011 |
| Abab Transport Ltd | Transport & logistics | 2020 |
| Abaines Limited | Transport & logistics | 2024 |
| Abbey Meads Financial Ltd | Extraterritorial | 1995 |
| Abbey Prestige Homes (Bescar) Limited | Construction | 2026 |
| Abbeygold Estates Limited | Real estate | 2011 |
| Abbotsford Endo Services Limited | Health & social care | 2015 |
| Abbott & SON Roofline Ltd | Construction | 2023 |
| Abbotts Business Park Limited | Administrative & support | 2017 |
| Abbotts Business Park Services Limited | Real estate | 2022 |
| Abby Plant Hire & Sales Limited | Administrative & support | 2019 |
| ABC Video Facilities Limited | Information & communication | 2003 |
| Abel Learning Limited | Education | 2008 |
| Abelglass Trade Supplies Ltd | Manufacturing | 2009 |
| Abetteryu Limited | Health & social care | 2018 |
| Able Safety Services Limited | Professional & scientific | 1974 |
| ABLE-2 Property Maintenance Services Ltd | Construction | 2016 |
| Ablico Limited | Professional & scientific | 2012 |
| ABM Performance Ltd | Wholesale & retail | 2022 |
| ABN MEP Services Ltd | Construction | 2017 |
| Abnormal Load Logistics Limited | Administrative & support | 2013 |
| Above & Beyond Cleaning Solutions Ltd | Administrative & support | 2018 |
| ABR Brandketing Studio Ltd | Professional & scientific | 2024 |
| Abrukbymelissa Ltd | Health & social care | 2024 |
| ABS Commercial Solutions Limited | Professional & scientific | 2014 |
| ABS Network Solutions Ltd | Professional & scientific | 2020 |
| ABS Property Management Limited | Administrative & support | 2022 |
| ABS Recruitment Limited | Administrative & support | 2018 |
| ABS Streetworks Solutions Limited | Administrative & support | 2017 |
| Absolut Bikes UK Limited | Financial services | 2016 |
| Absolut Engineering Solutions Limited | Manufacturing | 2013 |
| Absolute Music Library Limited | Information & communication | 2003 |
| Absolutely Revolutionary Media Ltd. | Professional & scientific | 2025 |
| Abvi Orbit Ltd | Information & communication | 2024 |
| AC Environmental Surveys Ltd | Professional & scientific | 2026 |
| AC Grounds Maintenance Services Ltd | Administrative & support | 2026 |
| AC Healthcare IT Solutions Ltd | Information & communication | 2020 |
| Academy Workwear & Promotions Limited | Wholesale & retail | 2008 |
| Acara Joinery Ltd | Construction | 2018 |
| Accelero Digital Solutions Limited | Information & communication | 2006 |
| Access MF Limited | Construction | 2023 |
| Accessories for the Home Ltd | Wholesale & retail | 2013 |
| Accident Lawyers Helpline (ALH) UK Ltd. | Professional & scientific | 2012 |
| Accord Counselling Ltd. | Health & social care | 2016 |
| Accord Financial Management Limited | Extraterritorial | 2004 |
| Accounting for Profit North West Ltd | Professional & scientific | 2014 |
| Accounts Sherpa Limited | Professional & scientific | 2023 |
| Accurate Insulation Limited | Administrative & support | 2017 |
| Accuratio Group Limited | Manufacturing | 2019 |
| Accuratio Holdings Limited | Financial services | 2024 |
| Ace Coaching & Teacher Training Services Ltd | Education | 2014 |
| Ace Fencing & Paving Limited | Public administration | 2021 |
| Ace Health and Care Providers Ltd | Other services | 2017 |
| Acero Construction Ltd | Construction | 2015 |
| Acero Welding and Civils Limited | Construction | 1996 |
| Acfallon Limited | Professional & scientific | 2024 |
| Ackers Properties Limited | Real estate | 2020 |
| Ackhurst Glass Limited | Construction | 1992 |