| Arcterra Ltd | Real estate | 2025 |
| Arctic Circle Ltd. | Manufacturing | 1984 |
| Arctic Crest Global Ltd | Wholesale & retail | 2026 |
| Arctic Electrical Ltd | Construction | 2023 |
| Arctic FOX Snow World Ltd | Manufacturing | 2022 |
| Arctic Tern Global Limited | Wholesale & retail | 2026 |
| Arctos Solutions Limited | Information & communication | 2025 |
| Arcus Corp Ltd | Construction | 2023 |
| Arda Buildings Limited | Real estate | 2020 |
| Ardalan Games Ltd | Information & communication | 2026 |
| Ardant Social Housing C.I.C. | Real estate | 2025 |
| Ardco Limited | Hospitality | 2013 |
| Arden Accident Repair Centre Ltd | Wholesale & retail | 2025 |
| Arden Builders Limited | | 1987 |
| Arden Care Group Ltd | Financial services | 2016 |
| Arden Cars Ltd | Transport & logistics | 2018 |
| Arden Community Care Limited | Real estate | 2014 |
| Arden Continental Car Accessory Company Limited | Manufacturing | 1960 |
| Arden Court (Kingsbury Road) Management Limited | Households | 1981 |
| Arden Court (Station Road) Management Company Limited | Households | 2002 |
| Arden Crave Corner Ltd | Hospitality | 2026 |
| Arden Croft New Homes Limited | Real estate | 2018 |
| Arden Eco Solutions Ltd | Other services | 2026 |
| Arden Education Limited | Administrative & support | 2016 |
| Arden Estate Agents Limited | Real estate | 2011 |
| Arden Estate Housing Limited | Real estate | 2026 |
| Arden Estate Partnerships Ltd | Real estate | 2004 |
| Arden Forest Properties Ltd. | Real estate | 2015 |
| Arden Forestry and Son's Ltd | Agriculture & fishing | 2024 |
| Arden Grills Ltd | Hospitality | 2019 |
| Arden Investments Holdings Limited | Financial services | 2019 |
| Arden Lettings Limited | Real estate | 2020 |
| Arden Management Limited | Households | 1981 |
| Arden Manufacturing Limited | Financial services | 2008 |
| Arden Orthotics Limited | Manufacturing | 1997 |
| Arden Park Developments Limited | Construction | 2022 |
| Arden Park Properties Limited | Construction | 2000 |
| Arden Properties (Birmingham) Limited | Real estate | 2005 |
| Arden Property Developments Ltd | Real estate | 2018 |
| Arden Risk Consultancy Limited | Professional & scientific | 2013 |
| Arden Smart Ironing & DRY Cleaning Limited | Other services | 2016 |
| Arden Street Limited | Construction | 2015 |
| Arden Support Ltd | Health & social care | 2019 |
| Arden Supported Living Ltd | Real estate | 2025 |
| Arden Transport Ltd | Transport & logistics | 2016 |
| Arden Valley Roofing Ltd | Construction | 2017 |
| Ardency Ltd | Other services | 2020 |
| Ardenfield Development Company Limited | Real estate | 1994 |
| Ardenlyx Care Solihull Limited | Health & social care | 2026 |
| Ardenlyx Health Group Limited | Financial services | 2026 |
| Ardens Dining Ltd | Hospitality | 2025 |
| Ardens Haulage Limited | Administrative & support | 2010 |
| Ardent Corporation Ltd | Other services | 2020 |
| Ardent Housing Ltd | Hospitality | 2025 |
| Ardenvale Advisory Limited | Professional & scientific | 2026 |
| Ardenwell.Global Ltd | Administrative & support | 2025 |
| Ardgo Raredram Limited | Wholesale & retail | 2023 |
| Ardi Driver Ltd | Transport & logistics | 2022 |
| Ardiou Healthcare Ltd | Manufacturing | 2016 |
| Ardler Group Ltd | Construction | 2024 |
| Ardmore Medical Ltd. | Health & social care | 2020 |
| Ardo Management LP | | 2017 |
| Ardos Energy Limited | Energy | 2016 |
| Ardroe Developments Limited | Real estate | 2019 |
| Ardroe Estates Limited | Real estate | 2021 |
| Ardstoke Ltd | Professional & scientific | 2012 |
| Ardun Estates Limited | Real estate | 2020 |
| ARE Property (Ammanford) Limited | Real estate | 2019 |
| ARE Property Limited | Professional & scientific | 2019 |
| ARE Property N1 Limited | Real estate | 2019 |
| ARE Property N2 Limited | Real estate | 2022 |
| Area 51 Cafe Ltd | Hospitality | 2018 |
| Areena Transport Limited | Transport & logistics | 2012 |
| Areevra International Limited | Wholesale & retail | 2025 |
| Areez Ltd | Wholesale & retail | 2023 |
| Arei (Commercial Property) Limited | Real estate | 2024 |
| Arei (House Building) Limited | Real estate | 2017 |
| Areje Aesthetics Ltd | Health & social care | 2024 |
| Aremay Clothing Ltd | Wholesale & retail | 2022 |
| Arena Signs and Print Limited | Professional & scientific | 2019 |
| Aresa E Films Ltd | Information & communication | 2025 |
| Aretsi Event Catering Limited | Hospitality | 2014 |
| ARF Holdings Limited | Real estate | 2022 |
| ARG Medical Ltd | Health & social care | 2022 |
| ARG Security Limited | Manufacturing | 1999 |
| Arga Holdings Ltd | Financial services | 2023 |
| Arga Trading Ltd | Wholesale & retail | 2023 |
| Argeela Birmingham Limited | Hospitality | 2024 |
| Argeela Lounge & Grill Ltd | Hospitality | 2016 |
| Argeela Ltd | Arts & recreation | 2015 |
| Argelan Ltd | Real estate | 2019 |
| Argent Fabrications Limited | Manufacturing | 2000 |
| Argent Halal Advisory Ltd | Professional & scientific | 2026 |
| Argentem Ltd | Professional & scientific | 2002 |
| Argiemar Ltd | Health & social care | 2023 |
| Argo Consulting Limited | Professional & scientific | 2015 |
| Argo Holdings Limited | Financial services | 2025 |
| Argo Properties (UK) Limited | Real estate | 1998 |
| Argo Property Holdings Limited | Real estate | 2021 |
| Argonaut Build Solutions Ltd | Professional & scientific | 2026 |