| AI Betaup Ltd | Wholesale & retail | 2026 |
| AI Future Minds Ltd | Education | 2025 |
| AI Mars Life Ltd | Health & social care | 2024 |
| AI OA Ltd | Information & communication | 2026 |
| AI Regent Ltd | Information & communication | 2024 |
| AI. Furniture Assembly Ltd | Other services | 2024 |
| Ai.Zone Ltd | Information & communication | 2018 |
| Aiam Holdings Ltd | Real estate | 2024 |
| Aibeauty Ltd | Wholesale & retail | 2026 |
| Aiby Limited | Administrative & support | 2023 |
| AIC Enterprise Limited | Professional & scientific | 2015 |
| Aidad Group Ltd | Construction | 2020 |
| Aidapak Limited | Administrative & support | 2009 |
| Aidc Ltd | Information & communication | 2026 |
| Aider Healthcare Limited | Professional & scientific | 2023 |
| Aidma UK Ltd | Manufacturing | 2018 |
| Aiesha's Aesthetics IPL & Laser Clinic Ltd | Other services | 2023 |
| AIG Platinum Properties Ltd | Real estate | 2025 |
| Aiinox Ltd | Education | 2025 |
| Aijlogistics Limited | Information & communication | 2022 |
| AIK Holdings Ltd | Real estate | 2015 |
| Aikyam Properties Private Limited | Real estate | 2024 |
| AIM Merchant Services Ltd | Administrative & support | 2009 |
| Aimal & Co. Ltd | Professional & scientific | 2013 |
| Aimec UK Ltd | Wholesale & retail | 2020 |
| Aimee Holdings Limited | Financial services | 2025 |
| Aimelia Apparel Limited | Wholesale & retail | 2017 |
| Aimlin Limited | Construction | 2008 |
| Aims Business Limited | Real estate | 2020 |
| Aims Digital UK Ltd | Information & communication | 2008 |
| Aims Europe Limited | Construction | 2010 |
| Aims Hotels Limited | Hospitality | 2025 |
| Aims Intl Ltd | Information & communication | 2024 |
| Aims Media Ltd | Hospitality | 2025 |
| Aims Realty UK Ltd | Construction | 2024 |
| Ainap Ltd | Information & communication | 2025 |
| Aiopensec Labs Ltd | Information & communication | 2025 |
| AIP Enterprises Limited | Transport & logistics | 2002 |
| AIP Estate Management Ltd | Real estate | 2024 |
| AIP Healthcare Ltd | Health & social care | 2023 |
| Aipco Limited | Manufacturing | 2024 |
| Air Cargo Global Kenya Ltd | Transport & logistics | 2018 |
| Airaix Limited | Construction | 2022 |
| Airam Ltd | Administrative & support | 2023 |
| Airan UK Ltd | Information & communication | 2018 |
| Aircraft Engineer Services Limited | Other services | 2025 |
| Airebo Limited | Manufacturing | 2015 |
| Airentex (UK) Limited | Professional & scientific | 2011 |
| Airnet Project Services Ltd | Information & communication | 2019 |
| Airoperate Ltd | Real estate | 2020 |
| Airoreserve Limited | Construction | 1987 |
| Airport Executive Transfer Limited | Transport & logistics | 2019 |
| Airport Express Ltd. | Transport & logistics | 2000 |
| Airportfare Private Hire Limited | Transport & logistics | 2020 |
| Airrchip Ltd | Information & communication | 2023 |
| Airs Group Ltd | Real estate | 2019 |
| Airtech (London) Limited | Manufacturing | 2000 |
| Airtight Building Solutions Ltd | Professional & scientific | 2013 |
| Airv Translations Ltd | Professional & scientific | 2016 |
| Aisec Ltd | Information & communication | 2025 |
| Aisri Delights Ltd | Hospitality | 2025 |
| AIT Solutions Limited | Information & communication | 2022 |
| Aitech Digital Limited | Construction | 2021 |
| Aitken & Spence Limited | Real estate | 2014 |
| Aitken Spencer Ltd. | Professional & scientific | 2014 |
| AIV Contractors Ltd | Construction | 2026 |
| Aiva Health Clinic & Phlebotomy Training Services Ltd | Public administration | 2024 |
| AJ & D Investments Limited | Real estate | 2019 |
| AJ & J Properties Ltd | Real estate | 2018 |
| AJ Air Ltd | Other services | 2023 |
| AJ Coaching & Development Limited | Education | 2023 |
| AJ Collins Holdings Limited | Health & social care | 2019 |
| AJ Consultancy Services (UK) Limited | Professional & scientific | 2014 |
| AJ Estates Holdings Ltd | Financial services | 2025 |
| AJ Maintenance Services Limited | Construction | 2019 |
| AJ Mart Limited | Wholesale & retail | 2019 |
| AJ Motor Oils Limited | Wholesale & retail | 2017 |
| AJ Mullins Limited | Professional & scientific | 2025 |
| AJ Nexus Ltd | Real estate | 2024 |
| AJ Phone Ltd | Wholesale & retail | 2025 |
| AJ Pizza's Limited | Hospitality | 2023 |
| AJ Restaurants Limited | Hospitality | 2012 |
| AJ Star Ltd | Water & waste | 2020 |
| AJ World of Motors Ltd | Wholesale & retail | 2021 |
| AJA Residential Ltd | Real estate | 2019 |
| Ajat Investments Limited | Real estate | 2016 |
| Ajax Palmer Equine Ltd | Agriculture & fishing | 2023 |
| Ajay & Co Properties Limited | Real estate | 2026 |
| Ajay Contracts Ltd | Construction | 2017 |
| Ajay Kumar Groundwork Limited | Construction | 2018 |
| Ajay Properties Limited | Real estate | 2004 |
| Ajbmed Ltd | Health & social care | 2023 |
| Ajbn Investments Limited | Financial services | 2024 |
| Ajbn Property Investments Limited | Real estate | 2024 |
| AJC Creative Limited | Professional & scientific | 2018 |
| Ajcom Limited | Professional & scientific | 2003 |
| Ajec Construction Ltd | Construction | 2015 |
| AJF Heating Mechanical and Electrical Services Ltd | Construction | 2026 |
| Ajis Holdings Limited | Financial services | 2021 |
| Ajis Investments Limited | Real estate | 2021 |