| A Town Consulting Ltd | Information & communication | 2026 |
| A W Childcare Limited | Administrative & support | 2024 |
| A&A Elite Cleaners Ltd | Administrative & support | 2025 |
| A&A London Cleaning Ltd | Construction | 2022 |
| A&A Luxury Ltd | Real estate | 2019 |
| A&A Motors (London) Ltd | Manufacturing | 2017 |
| A&A Strategy Ltd | Professional & scientific | 2025 |
| A&C Hospitality Ltd | Hospitality | 2026 |
| A&Cm Ltd | Construction | 2017 |
| A&E AV Limited | Construction | 2011 |
| A&E Private Limited | Hospitality | 2023 |
| A&G City Ltd | Wholesale & retail | 2020 |
| A&G Rogojina Spedition Ltd | Construction | 2020 |
| A&Gi Ltd | Real estate | 2024 |
| A&H Halaal Meat Ltd | Wholesale & retail | 2026 |
| A&J Capital Investments Limited | Manufacturing | 2021 |
| A&J Hair and Beauty Salon Ltd | Other services | 2012 |
| A&J Nunz LLP | | 2023 |
| A&K Solutions Ltd | Wholesale & retail | 2018 |
| A&M Corporations Limited | Administrative & support | 2024 |
| A&M Holdco Ltd | Real estate | 2024 |
| A&M Infinity Limited | Wholesale & retail | 2020 |
| A&M Retail Therapy Ltd | Wholesale & retail | 2017 |
| A&M Steel Limited | Manufacturing | 2019 |
| A&M Varsani Estate Limited | Real estate | 2024 |
| A&M Wellness Ltd | Manufacturing | 2025 |
| A&N Finishes Ltd | Construction | 2017 |
| A&N Hair and Beauty Salon Limited | Other services | 2026 |
| A&P Global Consultants LLP | | 2010 |
| A&P Prime Investment Ltd | Construction | 2018 |
| A&P Prime Property Ltd | Real estate | 2023 |
| A&P Trading Limited | Hospitality | 2018 |
| A&Pp Home Solutions Ltd | Information & communication | 2019 |
| A&R Foods Restaurant Ltd | Hospitality | 2023 |
| A&S Construct Ltd | Construction | 2019 |
| A&S Groundwork Ltd | Construction | 2024 |
| A&S Residential Holdings Ltd | Real estate | 2025 |
| A&V Builders Ltd | Construction | 2025 |
| A&V Laser Clinics Limited | Other services | 2021 |
| A-Z Direct Ltd | Wholesale & retail | 2017 |
| A-Z Healthcare (UK) Limited | Wholesale & retail | 1999 |
| A-Z SAP Logistics Support Limited | Information & communication | 2019 |
| A. B. Coultate Consulting Limited | Professional & scientific | 2015 |
| A. Doran Plant Limited | Construction | 1983 |
| A. Majeed & Co Ltd | Professional & scientific | 2025 |
| A. T. S. Property Maintenance Ltd | Construction | 2021 |
| A.C.R. (Flat Management) Limited | Households | 1977 |
| A.F PCO Rentals Ltd | Administrative & support | 2024 |
| A.K. Fleet Services Limited | Transport & logistics | 2005 |
| A.L. Work in Progress Ltd | Professional & scientific | 2021 |
| A.L.M Rental Ltd | Real estate | 2025 |
| A.M Builders and Developers Global Ltd | Professional & scientific | 2025 |
| A.M.M. Carpentry Ltd | Administrative & support | 2017 |
| A.M.Meri Architects Limited | Professional & scientific | 2012 |
| A.R. Consultants Limited | Other services | 1991 |
| A.R.M Work Ltd | Construction | 2025 |
| A.S.B. (UK) Limited | Real estate | 2001 |
| A.V.Fowlds & Sons Limited | Wholesale & retail | 1933 |
| A.W.A. Refiners Limited | Manufacturing | 1991 |
| A1 Classics Ltd | Wholesale & retail | 2025 |
| A1 Cleaning Crew Ltd | Administrative & support | 2025 |
| A1 Crystal Glass Limited | Wholesale & retail | 2010 |
| A1 Essentials Limited | Hospitality | 2024 |
| A1 Holding Group Ltd | Financial services | 2023 |
| A1 Lending Ltd | Financial services | 2019 |
| A1 Masala Mart Limited | Wholesale & retail | 2021 |
| A1 Properties Holding Ltd | Real estate | 2023 |
| A1 Repair Centre Ltd | Wholesale & retail | 2025 |
| A1 Repair Ltd | Wholesale & retail | 2020 |
| A1J Homes UK Ltd | Real estate | 2024 |
| A1SONIC Quality for Less Ltd | Wholesale & retail | 2014 |
| A1UK Limited | Other services | 2018 |
| A2 on SET Medical Ltd | Health & social care | 2026 |
| A212 Ltd | Administrative & support | 2018 |
| A2A Trade(Uk) Ltd | Wholesale & retail | 2024 |
| A2B Deliveries Limited | Extraterritorial | 2002 |
| A2OMEGA Ltd | Information & communication | 2024 |
| A2OMEGA Services Ltd | Information & communication | 2024 |
| A2SOURCE Limited | Information & communication | 2022 |
| A2X Consultancy Limited | Information & communication | 2013 |
| A2Z Autocare Ltd | Wholesale & retail | 2025 |
| A2Z Procurement Services Limited | Wholesale & retail | 2020 |
| A2Z Tech Designs Ltd | Professional & scientific | 2014 |
| A3 Foods Limited | Manufacturing | 2001 |
| A3 International Trading Limited | Wholesale & retail | 2014 |
| A3 Resources Limited | Real estate | 2022 |
| A3D Scanning and Surveying Limited | Professional & scientific | 2025 |
| A501 Resources Limited | Real estate | 2023 |
| A5E Consulting Europe Ltd | Information & communication | 2023 |
| AA Accountancy and Info Management Services Ltd | Professional & scientific | 2004 |
| AA Auto Electrics Ltd | Manufacturing | 2023 |
| AA Cloud Limited | Wholesale & retail | 2025 |
| AA Electrician Ltd | Construction | 2025 |
| AA Engineers & Surveyors Ltd | Professional & scientific | 2021 |
| AA Fitters Ltd | Construction | 2021 |
| AA Future Limited | Real estate | 2011 |
| AA Golf Ltd | Hospitality | 2023 |
| AA Haji Ltd | Construction | 2021 |
| AA Halai Ltd | Real estate | 2017 |
| AA Heating & Plumbing Services Ltd | Construction | 2015 |