| Apricot CPS Limited | Construction | 2018 |
| Apricot Thorne Limited | Wholesale & retail | 2023 |
| April Cottage Property Limited | Real estate | 2020 |
| April Springs Limited | Real estate | 1995 |
| Apropos Building Services Limited | Construction | 2017 |
| APS Air Ltd | Construction | 2020 |
| APS Sixty Two Ltd | Administrative & support | 2019 |
| APS Technical Ltd | Wholesale & retail | 2024 |
| APS Vehicle Services Ltd | Transport & logistics | 2025 |
| Apsley Residence Management Limited | Households | 2026 |
| Apsley Street Development Limited | Real estate | 2021 |
| Apssr Ltd | Hospitality | 2023 |
| APT Dower House Ltd | Financial services | 2016 |
| APT for Good Limited | Real estate | 2024 |
| APT-2021 Ltd | Wholesale & retail | 2021 |
| Aptisima Ltd | Other services | 2025 |
| Aptok Limited | Administrative & support | 2013 |
| Apurv International Ltd | Wholesale & retail | 2026 |
| Apvp Limited | Real estate | 2014 |
| APX Enterprises Limited | Real estate | 2025 |
| APX Imperium Limited | Professional & scientific | 2024 |
| APY Limited | Wholesale & retail | 1998 |
| AQA (Leicester) Ltd | Real estate | 2008 |
| AQG (ALL Quality Goods) Ltd | Wholesale & retail | 2021 |
| AQM Speech and Language Therapy Ltd | Administrative & support | 2017 |
| Aqraz Ltd | Health & social care | 2022 |
| Aqsa Leicester Ltd | Wholesale & retail | 2024 |
| Aqsa Midlands Ltd | Wholesale & retail | 2025 |
| Aqsa Uppingham Road Ltd | Wholesale & retail | 2023 |
| Aqua Blaze Ltd | Construction | 2025 |
| Aqua Delight Limited | Wholesale & retail | 2020 |
| Aqua Housing SCS Ltd | Health & social care | 2020 |
| Aqua Risk Ltd | Public administration | 2024 |
| Aqua Shine Car Wash Ltd | Wholesale & retail | 2025 |
| Aqua Solutions Team Limited | Construction | 2019 |
| Aqua Vista Bar & Grill Ltd | Hospitality | 2025 |
| AQUA50 Limited | Manufacturing | 2015 |
| Aquadrome Holdings Limited | Financial services | 2023 |
| Aquafarmuk Ltd | Agriculture & fishing | 2019 |
| Aquafin Ltd | Wholesale & retail | 2025 |
| Aquafitting (UK) Limited | Water & waste | 2014 |
| Aquaheat 8 Limited | Construction | 2025 |
| Aqualots Ltd | Wholesale & retail | 2026 |
| Aquapet Limited | Wholesale & retail | 2017 |
| Aquarius Commerce Limited | Hospitality | 1996 |
| Aquarius Fish Bar Ltd | Hospitality | 2026 |
| Aquarius Wealth Management Limited | Financial services | 2007 |
| Aquastem Limited | Construction | 2026 |
| Aquaterre Limited | Professional & scientific | 1991 |
| Aquatherm (Midlands) Limited | Construction | 1999 |
| Aquaze Limited | Administrative & support | 2008 |
| Aquifolia Limited | Professional & scientific | 2016 |
| Aquila Properties Ltd | Real estate | 2024 |
| Aqva Online Limited | Wholesale & retail | 2013 |
| AR Building and Gardening Services Ltd | Construction | 2025 |
| AR Drinks Ltd | Hospitality | 2026 |
| AR Grill Ltd | Hospitality | 2026 |
| AR Holdings Leicester Limited | Financial services | 2025 |
| AR Kasuji Investments Ltd | Real estate | 2025 |
| AR Koria Medical Services Limited | Health & social care | 2015 |
| AR Kulkarni Ltd | Health & social care | 2021 |
| AR Legal Consultants Ltd | Professional & scientific | 2015 |
| AR Legal Solutions Ltd | Professional & scientific | 2025 |
| AR Leisure Collective Ltd | Construction | 2024 |
| AR Motors & Tyres Limited | Wholesale & retail | 2016 |
| AR Pattni Ltd | Health & social care | 2021 |
| AR Pension Trustees Limited | Financial services | 2000 |
| AR Pro Service Ltd | Real estate | 2023 |
| AR Rahman Travels Ltd | Administrative & support | 2024 |
| AR Shelby Ltd | Wholesale & retail | 2026 |
| AR Trading & Services Ltd | Wholesale & retail | 2025 |
| AR Wills & Estate Planning Ltd | Professional & scientific | 2024 |
| AR1 Limited | Hospitality | 2024 |
| ARA Properties Leicester Limited | Real estate | 2026 |
| ARA Software Limited | Information & communication | 2026 |
| ARA Star Limited | Real estate | 2020 |
| Araaek Interiors Ltd | Wholesale & retail | 2020 |
| Arabian Pearl Properties Ltd | Real estate | 2023 |
| Arabic With Mariam Ltd | Education | 2026 |
| Aradax Limited | Administrative & support | 2023 |
| Aradhika Ltd | Wholesale & retail | 2022 |
| Aradhya Multi-Trade Private Limited | Wholesale & retail | 2026 |
| Araeya RAI Ltd | Wholesale & retail | 2017 |
| Aranath Medicolegal Limited | Wholesale & retail | 2026 |
| Aranath Properties Ltd | Real estate | 2024 |
| Arancia Ltd | Wholesale & retail | 2012 |
| Aranyos Limited | Other services | 2025 |
| Aras Builders Ltd | Construction | 2025 |
| Arasa Brothers Ltd | Hospitality | 2019 |
| Aratel Trading Ltd | Wholesale & retail | 2022 |
| Arav-Viral Limited | Extraterritorial | 2019 |
| Araya Estates Ltd | Real estate | 2023 |
| Arazon Ltd | Other services | 2023 |
| ARB Medic Ltd | Health & social care | 2023 |
| Arbab and SON Ltd | Wholesale & retail | 2020 |
| Arbn Limited | Real estate | 2012 |
| Arboreco Limited | Agriculture & fishing | 2012 |
| Arborsurveys Ltd | Professional & scientific | 2026 |
| Arbour Solutions Ltd | Administrative & support | 2022 |
| ARC Consultants Ltd | Professional & scientific | 2025 |