| Aislelabs Limited | Information & communication | 2019 |
| Aisling Investments Limited | Households | 2024 |
| Aiso Ltd | Extraterritorial | 2019 |
| Aisosa Marshall Limited | Health & social care | 2026 |
| Aisshop Ltd | Wholesale & retail | 2025 |
| Aitaco Limited | Wholesale & retail | 2018 |
| Aitch Kayz Ltd | Wholesale & retail | 2025 |
| Aitex Security Ltd | Manufacturing | 2026 |
| Aitiven Ltd | Public administration | 2021 |
| Aitkenhead Storage Facility Limited | Energy | 2023 |
| Aitrial Ltd | Information & communication | 2025 |
| Aitugo Ltd | Wholesale & retail | 2025 |
| Aivanci Ltd | Information & communication | 2025 |
| Aiviou Ltd | Wholesale & retail | 2026 |
| Aiwiz Digital Marketing Limited | Information & communication | 2022 |
| Aixalda Limited | Administrative & support | 2021 |
| Aixuan Commerce Trading Limited | Wholesale & retail | 2025 |
| Aiya Estates Ltd | Real estate | 2025 |
| Aiyagoub for Services Ltd | Other services | 2024 |
| Aiyla & Zaki Properties Limited | Real estate | 2017 |
| Aiyla Properties Limited | Real estate | 2024 |
| AIZ Development Limited | Construction | 2021 |
| AIZ Hadfield Limited | Construction | 2022 |
| Aizah Foods Limited | Hospitality | 2026 |
| Aizal Enterprises Limited | Wholesale & retail | 2025 |
| Aizal-Products Ltd | Wholesale & retail | 2024 |
| Aizhan Group Ltd | Wholesale & retail | 2025 |
| AJ Miles Ltd | Construction | 2022 |
| AJ & RC Plumbing Services Ltd | Construction | 2024 |
| AJ (MC) Properties Ltd | Real estate | 2019 |
| AJ ACC Limited | Professional & scientific | 2026 |
| AJ Accounting Serv Ltd | Wholesale & retail | 2023 |
| AJ Agency Limited | Professional & scientific | 2023 |
| AJ Apparel Ltd | Wholesale & retail | 2020 |
| AJ Beans Ltd | Hospitality | 2024 |
| AJ Bell Touch Limited | Financial services | 2020 |
| AJ Builders Trafford Ltd | Construction | 2025 |
| AJ Burgers Ltd | Hospitality | 2025 |
| AJ Capital & Investments (UK) Ltd | Financial services | 2021 |
| AJ City CUT Ltd | Other services | 2025 |
| AJ Commercial Venture Limited | Other services | 2015 |
| AJ Consulting MCR Limited | Real estate | 2021 |
| AJ Crest Estates Ltd | Real estate | 2025 |
| AJ Deals Direct Limited | Wholesale & retail | 2026 |
| AJ Divine Ltd | Wholesale & retail | 2025 |
| AJ Fashion House Ltd | Wholesale & retail | 2026 |
| AJ Fashion MCR Ltd | Wholesale & retail | 2020 |
| AJ Finlay Ltd | Administrative & support | 2017 |
| AJ Happylife Ltd | Extraterritorial | 2025 |
| AJ Home Asset Management Ltd | Real estate | 2016 |
| AJ Home Developments Ltd | Real estate | 2016 |
| AJ Home Management Services Ltd | Real estate | 2021 |
| AJ Lakes Training Academy Ltd | Professional & scientific | 2020 |
| AJ Limos Ltd | Administrative & support | 2016 |
| AJ Locum Services Ltd | Health & social care | 2022 |
| AJ Locum Solutions Limited | Health & social care | 2009 |
| AJ Logistics & Fleet Services Ltd | Transport & logistics | 2026 |
| AJ Logistics MCR Ltd | Information & communication | 2025 |
| AJ Long Transport Services Ltd | Transport & logistics | 2014 |
| AJ Management Agents Ltd | Real estate | 2021 |
| AJ Marketing Solutions Ltd | Professional & scientific | 2020 |
| AJ Medico Legal Limited | Health & social care | 2024 |
| AJ Motor Trader Ltd | Wholesale & retail | 2020 |
| AJ Motors (ST Helens) Limited | Wholesale & retail | 2010 |
| AJ Pallets & Goods Ltd | Construction | 2017 |
| AJ Prop Ltd | Real estate | 2024 |
| AJ Properties Group Ltd | Real estate | 2025 |
| AJ Property (Cornwall) Ltd | Real estate | 2026 |
| AJ Property Ventures Ltd | Real estate | 2020 |
| AJ Signature Care Ltd | Health & social care | 2026 |
| AJ Studios MCR Ltd | Administrative & support | 2026 |
| AJ Suites Limited | Hospitality | 2025 |
| AJ Threads Limited | Wholesale & retail | 2025 |
| AJ Trade Ecommerce Ltd | Wholesale & retail | 2025 |
| AJ Transportation UK Ltd | Water & waste | 2018 |
| AJ Valet Services Ltd | Administrative & support | 2022 |
| AJ Walsh & Family Holdings Limited | Financial services | 2023 |
| AJ Zamenterprise Limited | Education | 2024 |
| AJ ZHI Property Ltd | Real estate | 2026 |
| Aj&K Motors Ltd | Wholesale & retail | 2026 |
| Aj's Academy Limited | Administrative & support | 2009 |
| Ajab International Limited | Wholesale & retail | 2023 |
| Ajaka & Ejis Ltd | Construction | 2019 |
| Ajamo Care Limited | Health & social care | 2020 |
| Ajareresalat.Com Limited | Information & communication | 2017 |
| Ajay Services Ltd | Wholesale & retail | 2024 |
| Ajay Technical Services Limited | Information & communication | 2013 |
| Ajayeb Al-Injaz for Investment Ltd | Construction | 2025 |
| AJB Design, Joinery & Shopfitting Ltd | Construction | 2016 |
| AJB Setting OUT Ltd | Construction | 2014 |
| AJC Builders Limited | Construction | 2001 |
| AJC Building Services Limited | Real estate | 1987 |
| AJC Environment Group Ltd | Professional & scientific | 2025 |
| AJC Property Maintenance Ltd | Construction | 2025 |
| AJC Tattoo Ltd | Other services | 2025 |
| AJD Commercial Solutions Ltd | Professional & scientific | 2025 |
| AJD Financial Solutions Ltd | Financial services | 2012 |
| AJD Properties Ltd | Real estate | 2024 |
| Ajdaero Ltd | Administrative & support | 2016 |
| Ajdent Ltd | Health & social care | 2024 |