| Aircraft Circus Academy Limited | Education | 2014 |
| Aircraft Circus Equipment Limited | Administrative & support | 2014 |
| Aircraft Parts & Logistics Limited | Wholesale & retail | 2002 |
| Airflow Fabrication Services Limited | Manufacturing | 2008 |
| Airflow Plumbing Ltd | Construction | 2021 |
| AIRFLOW1 Ltd | Construction | 2026 |
| Airio Ltd | Real estate | 2025 |
| Airport Connections Ltd | Other services | 2007 |
| Airport House Terminal One Ltd | Real estate | 2020 |
| Airspace U.K. Limited | Real estate | 1998 |
| Airtek Surveys Ltd | Professional & scientific | 2020 |
| Aitor IT Services Ltd | Information & communication | 2019 |
| Aizah Baig Limited | Hospitality | 2013 |
| AJ and C General Services Ltd | Professional & scientific | 2024 |
| AJ Chicken HUT Ltd | Hospitality | 2026 |
| AJ Developments Beckenham Ltd | Construction | 2024 |
| AJ Investment and Consultancy Ltd | Financial services | 2025 |
| AJ Lockhart Haulage Ltd | Transport & logistics | 2021 |
| AJ Naturals Ltd | Other services | 2014 |
| AJ Services (Croydon) Limited | Wholesale & retail | 2018 |
| Aj's Bazaar Ltd | Wholesale & retail | 2020 |
| AJA Construction & Building Ltd. | Construction | 2023 |
| AJA Lounge Ltd | Real estate | 2009 |
| Ajans Limited | Real estate | 2003 |
| AJB Capital Ltd | Professional & scientific | 2025 |
| AJE International Ltd | Wholesale & retail | 2016 |
| Ajee Farms Ltd | Agriculture & fishing | 2026 |
| AJG London Ltd | Wholesale & retail | 2023 |
| AJH Commercial Property Ltd | Real estate | 2023 |
| AJH Mechanical Limited | Construction | 2020 |
| AJH Property Developments Ltd | Construction | 2017 |
| Ajit & DEN Limited | Households | 2018 |
| AJK Property Services Ltd | Real estate | 2020 |
| AJM Foods Ltd | Hospitality | 2019 |
| AJM Realty Limited | Real estate | 2022 |
| Ajms Consultants Limited | Professional & scientific | 2018 |
| Ajms Group Limited | Financial services | 2020 |
| Ajona Consulting Ltd | Professional & scientific | 2025 |
| AJS Housing Ltd | Real estate | 2024 |
| Ajwa Restaurant Limited | Hospitality | 2023 |
| AK Accomodations Ltd | Real estate | 2024 |
| AK Builders London Limited | Construction | 2026 |
| AK CEL Service Ltd | Transport & logistics | 2023 |
| AK Farm Fresh Meats Limited | Wholesale & retail | 2017 |
| AK Solution Ltd | Construction | 2026 |
| AK System IT Solutions and Consulting Ltd | Information & communication | 2019 |
| AKA Property Investment Group Limited | Real estate | 2026 |
| Akagi Limited | Arts & recreation | 2025 |
| Akaya Group Limited | Wholesale & retail | 2019 |
| AKD 8 Limited | Wholesale & retail | 2025 |
| AKD Solutions Ltd | Administrative & support | 2008 |
| AKD9 Limited | Wholesale & retail | 2021 |
| AKG Beauty Limited | Other services | 2025 |
| Akhan Consulting Ltd | Information & communication | 2018 |
| Akhtar Brothers Limited | Health & social care | 2024 |
| Akin Healthcare Solution Ltd | Health & social care | 2018 |
| Akin Holdings Ltd | Financial services | 2019 |
| Akiya Sacred Beauty Ltd | Wholesale & retail | 2025 |
| AKJ Healthcare Ltd | Health & social care | 2016 |
| Akkas Eren Limited | Other services | 2020 |
| Akkira Ltd | Construction | 2025 |
| AKO Care Ltd | Health & social care | 2014 |
| Akos Media Ltd | Information & communication | 2016 |
| Akose Healthcare Ltd | Health & social care | 2020 |
| Akovi Ltd | Administrative & support | 2022 |
| Akoy Tyres Ltd | Wholesale & retail | 2023 |
| Akram Okongo Marketing Ltd | Professional & scientific | 2025 |
| Aksah Petroleum UK Ltd | Wholesale & retail | 2021 |
| Aksahota Properties Limited | Real estate | 2026 |
| Akshar RAM UK Limited | Wholesale & retail | 2012 |
| Akshaya Vasu UK Limited | Professional & scientific | 2026 |
| Akshna Chessmate Limited | Arts & recreation | 2023 |
| Akshnaservices Limited | Administrative & support | 2025 |
| AKU Capital Ltd | Information & communication | 2020 |
| AL Alphonso Management Services Limited | Administrative & support | 2010 |
| AL Costa Construction Ltd | Construction | 2016 |
| AL Fatihah Mosque and Islamic Centre | Other services | 2018 |
| AL Fazal Traders Ltd | Real estate | 2024 |
| AL GAS Services & Solutions Ltd | Construction | 2020 |
| AL Global Ltd | Transport & logistics | 2022 |
| AL Ihssan Consultation Services Ltd | Education | 2023 |
| AL Jalal Ltd | Wholesale & retail | 2025 |
| AL Mamlaka UK Limited | Construction | 2018 |
| AL Rahil (Muslim and Arab Funeral Home) Limited | Professional & scientific | 2008 |
| AL Razziq Limited | Construction | 2024 |
| AL Safa Group Ltd | Financial services | 2016 |
| AL Shabaz Properties Limited | Real estate | 2020 |
| AL Shams Global Trading Ltd | Wholesale & retail | 2026 |
| AL Sheikh Real Estate Ltd | Real estate | 2023 |
| Al-Kawthar Properties Ltd | Real estate | 2025 |
| Al-Khair Foundation | Education | 2003 |
| Al-Khair Foundation Schools Ltd | Education | 2026 |
| Al-Khair Schools Limited | Education | 2024 |
| Al-Zahrah Gold Limited | Wholesale & retail | 2026 |
| ALA147 Ltd | Hospitality | 2025 |
| Alabaksh Limited | Professional & scientific | 2009 |
| Alamari Transport Ltd | Transport & logistics | 2023 |
| Alan Barbers U.K Ltd | Other services | 2023 |
| Alan Builder Ltd | Construction | 2022 |
| Alan D (Franchise) Limited | Other services | 2008 |