| AI Cafe Ltd. | Information & communication | 2023 |
| AI Charlie UK Bidco Limited | Financial services | 2022 |
| AI Factoria Ltd | Information & communication | 2026 |
| AI Gorilla Ltd | Information & communication | 2025 |
| AI Husain Ltd | Information & communication | 2025 |
| AI Lettings Ltd | Real estate | 2023 |
| AIA MC Holdings Ltd | Financial services | 2024 |
| AIA MC Properties Ltd | Real estate | 2024 |
| Aichan Wholesale Ltd | Wholesale & retail | 2018 |
| AIE Technology Solutions Ltd | Information & communication | 2025 |
| AIFOS22 Ltd | Hospitality | 2025 |
| AIFOS63 Ltd | Hospitality | 2025 |
| Aiic Group Limited | Financial services | 2025 |
| Aiic Group Services Limited | Professional & scientific | 2020 |
| Aiic Groupco 1 Ltd | Financial services | 2012 |
| Aiic Holdings Limited | Financial services | 2015 |
| Ailadland Limited | Wholesale & retail | 2019 |
| AIM Higher Global Ltd | Professional & scientific | 2010 |
| Aimalohi Limited | Other services | 2021 |
| Aimax Orbits Ltd | Professional & scientific | 2024 |
| Aiml Solutions Ltd | Information & communication | 2022 |
| Ainvest 1 UK Ltd | Real estate | 2017 |
| Aiproducts Sports UK Ltd | Manufacturing | 2021 |
| Air & Paradise Limited | Hospitality | 2024 |
| Air RO Construction Ltd | Construction | 2018 |
| Airblast Eurospray Limited | Wholesale & retail | 2002 |
| Airblast Limited | Manufacturing | 1986 |
| Airborne Platforms UK Ltd | Information & communication | 2015 |
| Aircraft Engineering Consultancy and Training Ltd | Professional & scientific | 2010 |
| Airfield Warehousing Limited | Transport & logistics | 1985 |
| Airforce BMX Limited | Wholesale & retail | 2021 |
| Airhunte Limited | Wholesale & retail | 2024 |
| Airlines 4 Dialogue Limited | Other services | 2006 |
| Airon Logistics Ltd | Administrative & support | 2013 |
| Airpage Limited | Information & communication | 1991 |
| Airphone Limited | Information & communication | 1994 |
| Airplane Mode Ltd | Manufacturing | 2021 |
| Airpoweredflight Ltd | Wholesale & retail | 2019 |
| Airside Active Ltd | Other services | 2025 |
| Airtours Holidays Transport Limited | Administrative & support | 1997 |
| Airwaves Air Conditioning Limited | Energy | 2017 |
| AIS Group Ltd | Real estate | 2025 |
| Aisha Boutique Ltd | Wholesale & retail | 2026 |
| Aisimple Ltd | Information & communication | 2024 |
| Aisner Ltd | Transport & logistics | 2022 |
| Aiyma Limited | Hospitality | 2025 |
| AJ Brickwork Trading Limited | Construction | 2021 |
| AJ Bridger Ltd | Real estate | 2020 |
| AJ Carpentery Ltd | Construction | 2023 |
| AJ Cleaning Quest Ltd | Administrative & support | 2024 |
| AJ Globe Property Management Ltd | Real estate | 2013 |
| AJ Motor Hub Ltd | Wholesale & retail | 2025 |
| AJ Transsport Ltd | Wholesale & retail | 2021 |
| Aj&Hr Properties Ltd | Real estate | 2021 |
| Aj's Gym Peterborough Ltd | Health & social care | 2021 |
| AJB Holdings (Peterborough) Limited | Construction | 2010 |
| AJC Kingsley Properties Ltd | Real estate | 2026 |
| AJC Systems Limited | Information & communication | 2007 |
| Ajebon Holdings Ltd | Real estate | 2025 |
| AJF Management Services Limited | Professional & scientific | 2004 |
| Ajfc Ltd | Professional & scientific | 2016 |
| AJH Contract Builders Limited | Administrative & support | 2016 |
| Ajibola Social Care Solutions Ltd | Health & social care | 2022 |
| AJJ Jets Ltd | Professional & scientific | 2018 |
| Ajkorn Trading Ltd | Wholesale & retail | 2024 |
| AJO Productions Ltd | Other services | 2026 |
| Ajproperties& Services Ltd | Real estate | 2025 |
| AJR Auto Services Limited | Wholesale & retail | 2019 |
| AJR Eco Solutions Ltd | Professional & scientific | 2020 |
| AJS Content Solutions Limited | Professional & scientific | 2019 |
| AJS Support Services Ltd | Professional & scientific | 2025 |
| AJT Drive Ltd | Transport & logistics | 2014 |
| AJW Ecom Holdings Ltd | Financial services | 2025 |
| AJW Engineering Solutions Limited | Professional & scientific | 2012 |
| AK Autohub Ltd | Wholesale & retail | 2025 |
| AK Cambs Properties Ltd | Real estate | 2023 |
| AK Fashion London Ltd | Wholesale & retail | 2023 |
| AK Giftshop Ltd | Wholesale & retail | 2017 |
| AK Global Group Ltd | Real estate | 2026 |
| AK Ophthalmic Services Ltd | Health & social care | 2024 |
| AK Party Supplies Ltd | Wholesale & retail | 2023 |
| AK Peterborough Ltd | Transport & logistics | 2022 |
| AK Retail Group Limited | Wholesale & retail | 2004 |
| AK Retail Newco Limited | Other services | 2018 |
| AK Shawarma Ltd | Hospitality | 2025 |
| AK Sound Account Ltd | Professional & scientific | 2019 |
| Akanda Property Investment Ltd | Real estate | 2026 |
| AKB & MB Consulting Limited | Professional & scientific | 2019 |
| Akbk Accounting Limited | Professional & scientific | 2007 |
| AKC Veterinary Ophthalmology Ltd | Professional & scientific | 2026 |
| Akdn Company Ltd | Transport & logistics | 2012 |
| Akhlaque & Shahana Ltd | Real estate | 2017 |
| Akhunavr Ltd | Wholesale & retail | 2025 |
| Akixi Bidco Ltd | Financial services | 2022 |
| Akixi Limited | Information & communication | 2008 |
| Akixi Midco Ltd | Financial services | 2022 |
| Akixi Topco Ltd | Financial services | 2022 |
| Akkaal Transport Ltd | Transport & logistics | 2017 |
| Akkuammu Limited | Health & social care | 2023 |
| AKL Truck & Trailer Repairs Ltd | Wholesale & retail | 2011 |