| Aska UK SPV Limited | Real estate | 2024 |
| Askamore HR Ltd | Administrative & support | 2021 |
| Askin Events Limited | Hospitality | 2026 |
| Aslam Property Group (APG) Ltd | Real estate | 2020 |
| Asmash Ltd | Hospitality | 2023 |
| Asmin Transport Ltd | Transport & logistics | 2025 |
| Aspire Group Limited | Administrative & support | 2015 |
| Aspire Life Coaching Solutions Ltd | Other services | 2020 |
| Aspire REC2REC Limited | Administrative & support | 2015 |
| Aspire Sales Limited | Administrative & support | 2022 |
| ASR Property Investments Ltd | Real estate | 2024 |
| Assessment Hive Limited | Administrative & support | 2019 |
| Asset Workforce Limited | Administrative & support | 2023 |
| ASSETBAR1 Ltd | Extraterritorial | 2022 |
| Association of Certified Professionals | Other services | 2018 |
| Astar Electronics Ltd | Wholesale & retail | 2021 |
| Astar Stays Ltd | Real estate | 2021 |
| Astinwood Limited | Real estate | 2002 |
| Astra Food Trading Ltd | Wholesale & retail | 2015 |
| ATC Commercial Limited | Professional & scientific | 2024 |
| ATC Residential Limited | Professional & scientific | 2024 |
| Ateres Seminary London Limited | Education | 2021 |
| Ateres Zahav Ltd | Real estate | 2024 |
| Ates Investment Holdings Ltd | Real estate | 2019 |
| Ates Investment Properties Limited | Real estate | 2019 |
| Athletix Kidz Reigate LLP | | 2026 |
| Atlas Escapes Ltd | Administrative & support | 2026 |
| ATM Property Holdings Ltd | Construction | 2025 |
| Atoc Construction Ltd | Construction | 2025 |
| Atoz Accountancy Ltd | Professional & scientific | 2021 |
| Atozessentials Ltd | Wholesale & retail | 2026 |
| Atta Cyber Solutions Ltd | Information & communication | 2025 |
| Attica Catering Ltd | Hospitality | 2019 |
| Audeo AQ Limited | Financial services | 2015 |
| Auranaluxe Ltd | Wholesale & retail | 2026 |
| Aurum Direct Ltd | Wholesale & retail | 2026 |
| Authentic M&H Goods Limited | Wholesale & retail | 2022 |
| Authenticity Governance Ltd | Professional & scientific | 2026 |
| Auto Elite Vehicles Limited | Wholesale & retail | 2025 |
| Auto Trend Global Limited | Wholesale & retail | 2024 |
| Autohaus Leka Limited | Real estate | 2016 |
| Automative Coachwork Limited | Administrative & support | 2012 |
| Automez Limited | Professional & scientific | 2015 |
| Automotive Repair Services Ltd | Wholesale & retail | 2024 |
| Autosel Limited | Wholesale & retail | 2023 |
| AVA Rose Clothing Limited | Wholesale & retail | 2025 |
| Avalon Hairdressing Limited | Other services | 2006 |
| Avalonia Global Ventures Ltd | Wholesale & retail | 2025 |
| Avance Limited | Hospitality | 2003 |
| Avangarda Seven Sisters Limited | Other services | 2017 |
| Avanti Support Services Ltd | Health & social care | 2025 |
| Avelia Solutions Ltd | Construction | 2025 |
| Aventurine I.T Resources Limited | Information & communication | 2014 |
| Avira Medical Limited | Health & social care | 2026 |
| AVO Construction Limited | Construction | 2013 |
| AVR Drylining Ltd | Construction | 2019 |
| Avrano Properties Limited | Construction | 2024 |
| Avro Media Ltd | Information & communication | 2024 |
| AVS Build Works Ltd | Construction | 2026 |
| Axios Estia Property Ltd | Real estate | 2019 |
| Ayla Food & Wine Ltd | Wholesale & retail | 2025 |
| Ayla Restaurant Limited | Hospitality | 2023 |
| Aylist Investments Ltd | Real estate | 2025 |
| Aylott of Beauty Limited | Wholesale & retail | 2022 |
| Ayser Property Investment Management Ltd | Real estate | 2026 |
| AYT London Limited | Construction | 2018 |
| Aytac Trade Co Ltd | Wholesale & retail | 2025 |
| Azad 2019 Limited | Hospitality | 2020 |
| Azanite Ltd | Real estate | 2025 |
| AZE Services Limited | Administrative & support | 2017 |
| Azimark Limited | Hospitality | 2008 |
| Azuka Holdings Ltd | Hospitality | 2020 |
| Azur 888 Limited | Hospitality | 2025 |
| Azzura (Essex) Limited | Wholesale & retail | 2025 |
| B and SM Altman Ltd | Financial services | 2020 |
| B Banea Glazing Ltd | Construction | 2015 |
| B K M Utilities Limited | Construction | 2018 |
| B Rose Consultancy Limited | Professional & scientific | 2016 |
| B S D Projects Ltd | Construction | 2023 |
| B Spoke Media Limited | Information & communication | 2010 |
| B U 207 Limited | Hospitality | 2026 |
| B&A Crofton Park Limited | Hospitality | 2020 |
| B&B Hygiene Consultant & Pest Controller Ltd | Hospitality | 2019 |
| B&D Estates Ltd | Real estate | 2015 |
| B&K Contractors Ltd | Construction | 2025 |
| B&S Electrical Services 22 Ltd | Construction | 2022 |
| B-Line Plumbing & Heating Ltd | Construction | 2012 |
| B-Remote Ltd | Administrative & support | 2016 |
| B.A.C. Educational Club Ltd | Education | 2023 |
| B.D.Lacey Plumbing & Heating Ltd | Construction | 2014 |
| B.K.K Ventures Ltd | Health & social care | 2022 |
| B2B Commercial Ltd | Wholesale & retail | 2021 |
| B2B Turkiye Limited | Wholesale & retail | 2026 |
| B3 Couriers Ltd | Transport & logistics | 2025 |
| B3 Fruit & VEG Ltd | Wholesale & retail | 2023 |
| B3 Properties Group Ltd | Real estate | 2024 |
| BA Estates Limited | Real estate | 2014 |
| Baan Ploy Thai Massage Limited | Other services | 2021 |
| Baba Ltd | Wholesale & retail | 2022 |
| Babsamkay Ventures Limited | Construction | 2017 |