| Aga’S Delivery Ltd | Transport & logistics | 2025 |
| AGB Build Ltd | Construction | 2015 |
| Agbabiaka Entertainment Promotions UK Ltd | Arts & recreation | 2020 |
| AGC Gearbox & Clutches Ltd | Wholesale & retail | 2020 |
| AGE UK Bolton Enterprises Limited | Other services | 1994 |
| AGE With Elegance Medical Aesthetics & Skin Clinic Ltd | Health & social care | 2025 |
| Agem 18 Ltd | Health & social care | 2022 |
| Agency TK London Limited | Professional & scientific | 2017 |
| Agent Wolf Limited | Professional & scientific | 2017 |
| Agentek Labs Limited | Information & communication | 2026 |
| AGH Group Limited | Construction | 2016 |
| AGH Maintenance Limited | Construction | 2016 |
| AGH Site Services Limited | Construction | 2016 |
| AGH Trading Limited | Wholesale & retail | 2024 |
| Agile Guarding Services Limited | Administrative & support | 2011 |
| Agile Healthcare Services Ltd | Health & social care | 2022 |
| Agile Leads Marketing Ltd | Professional & scientific | 2023 |
| Agile Lifecycle Solutions Limited | Professional & scientific | 2023 |
| Agile Student Ltd | Wholesale & retail | 2017 |
| Agile Training Services Limited | Education | 2020 |
| Agilexcel Limited | Professional & scientific | 2023 |
| Agilitech Ltd | Information & communication | 2019 |
| AGK Eco Energy Ltd | Other services | 2019 |
| AGM Patient Lifting Ltd | Construction | 2022 |
| Agma Property Developments Limited | Real estate | 2012 |
| Agmo Limited | Information & communication | 2023 |
| Agora Industrial Analytics Ltd | Professional & scientific | 2020 |
| Agpa Services Limited | Professional & scientific | 2002 |
| AGR Building & Fencing Contractors Limited | Manufacturing | 1998 |
| AGR Building & Fencing Holdings Limited | Professional & scientific | 2016 |
| Agrawal Properties Ltd | Real estate | 2021 |
| Agreed Earth Ltd | Information & communication | 2021 |
| Agsam Limited | Real estate | 2005 |
| Agustus Limited | Wholesale & retail | 2026 |
| AH Cold Storage Ltd | Transport & logistics | 2026 |
| AH Commerce Ltd | Wholesale & retail | 2026 |
| AH Environmental Services Limited | Administrative & support | 2023 |
| AH Groundworks & Waste Management Ltd | Water & waste | 2025 |
| AH Nutrition Ltd | Health & social care | 2025 |
| AH Takeaway Ltd | Hospitality | 2019 |
| AH Technical Solutions Limited | Construction | 2019 |
| AHC Pristine Cleaning Ltd | Wholesale & retail | 2025 |
| AHC Properties Ltd | Real estate | 2021 |
| AHH Advisory Ltd | Professional & scientific | 2025 |
| AHK Trade Group Ltd | Other services | 2021 |
| Ahkorp Ltd | Wholesale & retail | 2022 |
| Ahlam Enterprises Ltd | Wholesale & retail | 2024 |
| Ahmad and Daughters Ltd | Manufacturing | 2025 |
| Ahmad Naseers & Co Ltd | Wholesale & retail | 2025 |
| Ahmed & SON Estates Ltd | Real estate | 2026 |
| Ahmed & Sons Group Ltd | Financial services | 2026 |
| Ahmed AL Maghribi Perfumes International Limited | Wholesale & retail | 2024 |
| Ahmed Dent Holdings Ltd | Real estate | 2023 |
| Ahmed Ismail Healthcare Ltd | Health & social care | 2026 |
| Ahmed Perfumes Ltd | Wholesale & retail | 2023 |
| Ahmed Poultry Limited | Wholesale & retail | 2015 |
| Ahmed Village Market Ltd | Wholesale & retail | 2019 |
| Ahmeda Ltd. | Health & social care | 2016 |
| AHN Medical Services Ltd | Health & social care | 2020 |
| AHN Properties Ltd | Real estate | 2022 |
| Ahnretail Ltd | Wholesale & retail | 2023 |
| AHR (UK) Limited | Administrative & support | 2003 |
| AHR Cars Limited | Wholesale & retail | 2025 |
| AHS Property Solutions Ltd | Professional & scientific | 2023 |
| AHS Rentals Ltd | Administrative & support | 2026 |
| AHS Trade Limited | Wholesale & retail | 2025 |
| Ahsan Group Holdings Ltd | Financial services | 2024 |
| Ahsan Optical Ltd | Wholesale & retail | 2019 |
| AHT Distribution Limited | Wholesale & retail | 2023 |
| Ahtasham ALI Ltd | Wholesale & retail | 2025 |
| Ahwa Group Limited | Financial services | 2025 |
| Ahwa Properties Limited | Real estate | 2025 |
| AHZ Chefs Group Ltd | Hospitality | 2026 |
| AI Bilal Ltd | Wholesale & retail | 2023 |
| AI Electronics Ltd | Wholesale & retail | 2026 |
| AI Pixellink Ltd | Professional & scientific | 2025 |
| AI Tax Solutions Limited | Professional & scientific | 2025 |
| AI2B Ltd | Information & communication | 2024 |
| Aiad Investments Limited | Real estate | 2017 |
| Aiau Bargains Ltd | Wholesale & retail | 2026 |
| AIB Locums Limited | Administrative & support | 2025 |
| AIC Locum Ltd | Health & social care | 2024 |
| Aicb Ltd | Wholesale & retail | 2023 |
| Aiding Minds Ltd | Education | 2018 |
| AIF Fashion Holdings Ltd | Financial services | 2023 |
| AIF Fashion Limited | Wholesale & retail | 2019 |
| Aifluence Limited | Information & communication | 2025 |
| Aiforce Technology Group Ltd | Information & communication | 2026 |
| AIG (Northwest) Property Ltd | Real estate | 2025 |
| Aikon Media Ltd | Professional & scientific | 2024 |
| AIM Enable Limited | Administrative & support | 2010 |
| AIM Management Ltd | Professional & scientific | 2022 |
| Aimaar Ltd | Wholesale & retail | 2024 |
| Aimee M Coaching Ltd | Other services | 2026 |
| Aimey Limited | Wholesale & retail | 2026 |
| Aimh Group Ltd | Wholesale & retail | 2026 |
| Aims Consultant UK Limited | Information & communication | 2024 |
| Aims Global Limited | Wholesale & retail | 2018 |
| Aims Petrogrocs Ltd | Wholesale & retail | 2014 |
| Aims Therapy Ltd | Health & social care | 2024 |