| 20 Property Holdings Ltd | Real estate | 2023 |
| 2034 Limited | Financial services | 2020 |
| 333 DM Ltd | Professional & scientific | 2022 |
| 35 Princess Street Management Limited | Real estate | 2003 |
| 360 Project Solutions Limited | Professional & scientific | 2020 |
| 4M Floors UK Limited | Construction | 2010 |
| 7RADIUS Limited | Wholesale & retail | 2017 |
| 81 Rose Garden Clayton Limited | Extraterritorial | 2017 |
| A & L Services U.K. Ltd. | Construction | 2004 |
| A & T Marquees LLP | | 2022 |
| A C W Electrics Ltd | Other services | 2013 |
| A D Booth & Sons Cheshire Limited | Construction | 2021 |
| A D Booth & Sons Limited | Construction | 2004 |
| A D Booth & Weston Ltd | Real estate | 2011 |
| A D Booth Group Limited | Financial services | 2026 |
| A Golash Limited | Health & social care | 2009 |
| A K Inspections Limited | Professional & scientific | 2010 |
| A Kimberley Contracting Limited | Construction | 2026 |
| A Star Trophies Limited | Wholesale & retail | 2012 |
| A W Roofing Contractors Limited | Construction | 2014 |
| A&C Leisure UK Ltd | Real estate | 2021 |
| A&Jc Consultancy Ltd | Professional & scientific | 2019 |
| A.E.T. Engineering Consultancy Company Limited | Professional & scientific | 2013 |
| AA Leather Limited | Manufacturing | 2018 |
| Abacus Language Services Ltd | Administrative & support | 2013 |
| Abbey Pet Stores Ltd | Wholesale & retail | 2003 |
| ABC Trade Windows Ltd | Construction | 2025 |
| Able Commercial Finance Limited | Professional & scientific | 2016 |
| Able Resourcing Limited | Administrative & support | 2020 |
| ABS Computers Ltd | Other services | 2016 |
| Academy Photography Ltd | Professional & scientific | 2002 |
| Acar (Realisations) Limited | Manufacturing | 1966 |
| Acesco Ltd | Wholesale & retail | 2023 |
| Acorn to Oak Staffs Limited | Wholesale & retail | 2025 |
| Acradidos Products (S-O-T) Limited | Wholesale & retail | 2013 |
| Active Concept Enterprise Ltd | Construction | 2017 |
| Active Leisure Caravans Limited | Financial services | 2023 |
| Active Leisure Storage Limited | Transport & logistics | 2024 |
| Adbeck Fabrications Limited | Manufacturing | 2000 |
| ADF Commercial Ltd | Real estate | 2022 |
| ADF Construction and Developments Ltd | Construction | 2013 |
| ADF Developments Ltd | Real estate | 2019 |
| ADF Electrical Services Ltd | Construction | 2021 |
| ADF Group Ltd | Extraterritorial | 2020 |
| ADF Investments Ltd | Real estate | 2013 |
| ADF Roofing Services Ltd | Construction | 2026 |
| ADF Signature Homes Ltd | Construction | 2016 |
| Admi Holdings Limited | Financial services | 2018 |
| AE Golf Academy Limited | Education | 2021 |
| Aeon Consulting Limited | Professional & scientific | 2022 |
| Aeon Engineering Ltd | Information & communication | 2016 |
| Aerospace Marine Limited | Manufacturing | 2020 |
| AGI Catering Limited | Hospitality | 2019 |
| AGO Properties Staffordshire Limited | Real estate | 2021 |
| AH Children Law Limited | Professional & scientific | 2021 |
| AI Courses Ltd | Extraterritorial | 2023 |
| AIB Solutions Limited | Construction | 2003 |
| AJM Heating & Plumbing Limited | Construction | 2015 |
| Akam Consultancy Limited | Professional & scientific | 2021 |
| Albion Business Limited | Administrative & support | 2002 |
| Albion Leasing Limited | Other services | 2008 |
| Alchemy Telco Solutions UK Ltd | Information & communication | 2015 |
| Alder Technical Services Limited | Information & communication | 2017 |
| Alex Consultancy Limited | Health & social care | 2021 |
| Alex Elliott Media Limited | Information & communication | 2021 |
| Alfred Albert LLP | | 2009 |
| Alive Network Limited | Administrative & support | 2000 |
| ALL Arms PRI Ltd | Wholesale & retail | 2023 |
| Allendale Care Limited | Health & social care | 2013 |
| Alma Rose Music Ltd | Arts & recreation | 2021 |
| Alpha Systems Fabrication Limited | Manufacturing | 2015 |
| Alumenar Light Group Limited | Manufacturing | 2016 |
| Alvis Avenue Properties Limited | Real estate | 2018 |
| AMB Insurance Services Ltd. | Financial services | 2003 |
| AMB Property Management Limited | Administrative & support | 2014 |
| Amit Education Ltd | Wholesale & retail | 2019 |
| Amma Medical Limited | Professional & scientific | 2013 |
| Anchor Property Restorations Ltd | Construction | 2019 |
| Andritz Limited | Manufacturing | 1994 |
| Andy Kerr Associates LLP | | 2014 |
| Anglers Workshop Limited | Other services | 1991 |
| Anglia Home Living Unlimited | Administrative & support | 2016 |
| Antelope Logistics Limited | Transport & logistics | 2023 |
| AOB Property Management Limited | Real estate | 2021 |
| Apedale Construction Limited | Construction | 2020 |
| Apex Property Limited | Extraterritorial | 2015 |
| Aquarius Wealth Solutions Ltd | Real estate | 2021 |
| AR Computers Limited | Information & communication | 2014 |
| ARC I.T. Solutions Limited | Information & communication | 2003 |
| ARC IT Solutions Group Limited | Information & communication | 2023 |
| Arlo Building Services Ltd | Construction | 2016 |
| Art in Clay Limited | Administrative & support | 2016 |
| Art Property Portfolio Limited | Real estate | 2003 |
| Art SF Limited | Arts & recreation | 2016 |
| ASA Stoke Ltd | Health & social care | 2020 |
| Asad Online Limited | Wholesale & retail | 2025 |
| Asbestos Pro Ltd | Construction | 2019 |
| Ashdale Pottery Limited | Manufacturing | 1975 |
| Associated Steel Products Limited | Manufacturing | 2007 |
| Aston Builders Limited | Construction | 2015 |