| Afsam Trading Ltd | Wholesale & retail | 2026 |
| Afslaik Ltd | Health & social care | 2024 |
| Afspharm Ltd | Health & social care | 2018 |
| AFT Servicios Limited | Information & communication | 2024 |
| Aftertheshow Ltd | Wholesale & retail | 2026 |
| Aftran Global Limited | Wholesale & retail | 2013 |
| AFU Properties Ltd | Real estate | 2019 |
| Afwa Ltd | Wholesale & retail | 2020 |
| Afzal Travel Ltd | Transport & logistics | 2025 |
| AG Consult Ltd | Construction | 2005 |
| AG Life Sciences Design Limited | Other services | 2023 |
| AG Resource Solutions Limited | Real estate | 2014 |
| Agaped Healthlink Ltd | Health & social care | 2014 |
| Aghani Limited | Wholesale & retail | 2025 |
| AGI Installations Limited | Construction | 2011 |
| Agile Land Limited | Professional & scientific | 2023 |
| Agile Monster Ltd | Information & communication | 2017 |
| Agilely Ltd | Information & communication | 2025 |
| Agiletraders Global Ltd | Wholesale & retail | 2022 |
| Agilisty Consulting Limited | Professional & scientific | 2016 |
| Agilita Digital Ltd | Professional & scientific | 2025 |
| Agkb Ltd | Administrative & support | 2017 |
| Agmp Holdings Ltd | Real estate | 2020 |
| AGP Solution Ltd | Other services | 2023 |
| Agriculture Broker Ltd | Administrative & support | 2018 |
| Agrosmart (Holdings) Limited | Financial services | 2023 |
| Agrosmart Limited | Manufacturing | 2011 |
| AH (Huddersfield) Locum Services Limited | Wholesale & retail | 2023 |
| AH Drive Ltd | Transport & logistics | 2025 |
| AH Intelligence Limited | Professional & scientific | 2018 |
| AH Optics Ltd | Professional & scientific | 2011 |
| AH Platinum Taxis Ltd | Transport & logistics | 2025 |
| AH Riders Ltd | Transport & logistics | 2024 |
| AH97 Ltd | Hospitality | 2024 |
| AHA Healthcare Ltd | Health & social care | 2020 |
| Ahad Goods Limited | Wholesale & retail | 2022 |
| AHJ Developments Limited | Professional & scientific | 2016 |
| AHK Reporting Limited | Health & social care | 2017 |
| Ahmad & Co Travels Ltd | Transport & logistics | 2025 |
| Ahmad Bizzhub Services Ltd | Professional & scientific | 2025 |
| Ahmad Raza Tradings Ltd | Wholesale & retail | 2026 |
| Ahmed Health & Medical Services Ltd | Health & social care | 2018 |
| Ahmj RD Ltd | Health & social care | 2023 |
| AHR Building Surveying Limited | Professional & scientific | 2004 |
| Ahram Travel Ltd | Transport & logistics | 2023 |
| AHS Dental Limited | Health & social care | 2023 |
| AHS Global Limited | Wholesale & retail | 2025 |
| AHS Health Limited | Health & social care | 2023 |
| AHS Trading Ltd | Wholesale & retail | 2021 |
| Ahsan Global Ltd | Wholesale & retail | 2021 |
| Ahsanakramoman Ltd | Wholesale & retail | 2025 |
| Ahsans Photo and Cinema Ltd | Information & communication | 2021 |
| AI Car Sales Ltd | Wholesale & retail | 2026 |
| AI Health Analytics Limited | Professional & scientific | 2021 |
| AI Mobiles Ltd | Wholesale & retail | 2025 |
| AI Optics Ltd | Health & social care | 2025 |
| AI Taskvox Ltd | Information & communication | 2023 |
| AI Tea Drinks Limited | Hospitality | 2020 |
| AI Vendi Limited | Wholesale & retail | 2026 |
| AIA Corporation Ltd | Health & social care | 2022 |
| Aijaycarers Limited | Health & social care | 2022 |
| AIM & Achieve Driving School Ltd | Education | 2025 |
| AIM Legacy Holdings Ltd | Financial services | 2026 |
| Aimbry International Limited | Extraterritorial | 1979 |
| Ainets Ltd | Wholesale & retail | 2017 |
| Ainley Estates Limited | Real estate | 2019 |
| Air Trolley Limited | Wholesale & retail | 2026 |
| Aircraft Instruments Limited | Administrative & support | 1994 |
| Aire Golf Ltd | Arts & recreation | 2026 |
| Airevalley Medical Ltd | Health & social care | 2022 |
| Airey of Leeds Limited | | 1926 |
| Airpitch Allplay CIC | Education | 2024 |
| Airstream Works Holdings Limited | Financial services | 2018 |
| Aiscent Skills Limited | Professional & scientific | 2025 |
| Aisite Ltd | Administrative & support | 2024 |
| Aitrex Limited | Wholesale & retail | 2023 |
| AJ and SA Properties Limited | Real estate | 2018 |
| AJ Collins Associates Limited | Professional & scientific | 2013 |
| AJ GAS and Ground Works Limited | Construction | 2013 |
| AJ Generators Ltd | Wholesale & retail | 2021 |
| Aj&H Services Ltd | Real estate | 2017 |
| AJA Ltd | Wholesale & retail | 2023 |
| Ajaib Associates Ltd | Real estate | 2022 |
| AJB Staffing (Yorkshire) Limited | Education | 2019 |
| AJB Training (Yorkshire) Limited | Education | 2012 |
| AJC Property Developments Ltd | Real estate | 2021 |
| AJG Associates Limited | Professional & scientific | 2021 |
| AJL Car Care Centre Limited | Wholesale & retail | 2014 |
| AJM Drives & Controls Ltd | Manufacturing | 2005 |
| Ajmal GPL Limited | Health & social care | 2016 |
| AJN Plumbing Ltd | Extraterritorial | 2017 |
| AJR Construction Yorkshire Ltd | Construction | 2020 |
| AJR Engineering Ltd | Manufacturing | 2007 |
| AJS Detailing & Valeting Ltd | Wholesale & retail | 2024 |
| Ajwad Trading Ltd | Wholesale & retail | 2021 |
| AK Auto Centre Limited | Wholesale & retail | 2012 |
| AK Building and Home Improvements Limited | Construction | 2024 |
| AK Finance Services Ltd | Financial services | 2015 |
| AK Hawk Properties Ltd | Real estate | 2025 |
| AK Pizza (Yorkshire) Ltd | Hospitality | 2022 |