| Andromeda X Ltd | Financial services | 2025 |
| Andy Donaghie Cable Solutions Ltd | Professional & scientific | 2014 |
| Andy Landscapes Ltd | Administrative & support | 2020 |
| Anelec Group Limited | Professional & scientific | 2015 |
| Anfo Electrical Limited | Construction | 2023 |
| Angel Care North East Ltd | Health & social care | 2023 |
| Angel Cash & Carry Limited | Wholesale & retail | 2025 |
| Angel Faced Aesthetics Ltd | Other services | 2025 |
| Angel Nails QT Ltd | Other services | 2025 |
| Anglesey Engineering Limited | Professional & scientific | 2022 |
| Anglesey Property Solutions Ltd | Real estate | 2025 |
| Anglo South Chambers Apartments Limited | Real estate | 2026 |
| Angrove Technical Services Ltd | Administrative & support | 2026 |
| Anika Medical Services Limited | Health & social care | 2019 |
| Animal Addiction Limited | Wholesale & retail | 2015 |
| Anis's Tandoori Ltd | Hospitality | 2025 |
| Ankara Africa Global Ltd | Wholesale & retail | 2024 |
| ANM Enterprise Ltd | Wholesale & retail | 2026 |
| Anoroc Investments Ltd | Professional & scientific | 2023 |
| Antalya Restaurant NE Ltd | Hospitality | 2025 |
| Antalya Shawarma NE Ltd | Hospitality | 2025 |
| Antalya Shawarma Original Limited | Hospitality | 2018 |
| Antalya Shawarma Restaurant Ltd | Hospitality | 2023 |
| Anthony Brown Inspection Services Limited | Construction | 2014 |
| Anthony Gill Access Ltd | Professional & scientific | 2014 |
| Anthony Wyke QA and QC Inspection Services Ltd | Other services | 2008 |
| ANU Shyni Retail Ltd | Wholesale & retail | 2021 |
| Anvil Creations Limited | Other services | 2014 |
| ANY Cosmetics 4U Ltd | Wholesale & retail | 2022 |
| ANY1 Active Limited | Arts & recreation | 2024 |
| AOB Fast Food Ltd | Hospitality | 2025 |
| AP Graham Logistics Ltd | Transport & logistics | 2025 |
| AP Inspection Solutions Ltd | Professional & scientific | 2019 |
| AP Plumbing Teesside Ltd | Construction | 2024 |
| AP Properties (NE) Ltd | Real estate | 2026 |
| AP SD Twenty Two Limited | Wholesale & retail | 2025 |
| AP Signals Ltd | Information & communication | 2020 |
| AP Trading NE Ltd | Wholesale & retail | 2021 |
| APD Property Services Limited | Real estate | 2018 |
| Apex Ace Ltd | Wholesale & retail | 2025 |
| Apex Competence & Standards Ltd | Professional & scientific | 2026 |
| Apex GAS Engineers Ltd | Construction | 2021 |
| Apex Grooming Limited | Other services | 2025 |
| Apex Investments & Holdings Ltd | Real estate | 2026 |
| Apex Property Experts Ltd | Construction | 2026 |
| Apex Solutions NE Ltd | Wholesale & retail | 2017 |
| Apex Stone Worktop Solutions Ltd | Wholesale & retail | 2025 |
| Apex Workforce Ltd | Administrative & support | 2026 |
| APG Diagnostics Ltd | Health & social care | 2023 |
| APL Access Inspection Ltd | Construction | 2024 |
| APL Consultancy Limited | Professional & scientific | 2022 |
| Aplus Learning Solutions Limited | Professional & scientific | 2024 |
| Apna's Curry House Limited | Hospitality | 2025 |
| Apollo Engineering Solutions Limited | Professional & scientific | 2012 |
| Apotheosis Holdings Limited | Financial services | 2023 |
| Applebridge Building Services Limited | Construction | 2015 |
| Applebridge Civils Limited | Construction | 2024 |
| Applebridge Construction Holdings Limited | Financial services | 2020 |
| Applebridge Construction Limited | Construction | 2013 |
| Applebridge Consulting LLP | | 2018 |
| Applebridge Family Limited | Financial services | 2024 |
| Applebridge Geoenvironmental Ltd | Professional & scientific | 2023 |
| Applebridge Group Limited | Construction | 2021 |
| Applebridge Limited | Extraterritorial | 2025 |
| Applebridge Utilities Limited | Construction | 2021 |
| Appleton Quality Services Limited | Professional & scientific | 2017 |
| Appleyard Physiotherapy Ltd | Professional & scientific | 2025 |
| Appleyard Security Ltd | Administrative & support | 2025 |
| Applied Integration UK Ltd | Information & communication | 2005 |
| Applied Intelligence Systems Ltd | Administrative & support | 2023 |
| Applied Scientific Technologies UK Ltd | Manufacturing | 2017 |
| APR Bespoke Joinery Ltd | Manufacturing | 2020 |
| April Creations Limited | Professional & scientific | 2025 |
| APS Fabrications Limited | Administrative & support | 2015 |
| APT Rigging Ltd | Professional & scientific | 2025 |
| Aqua Aesthetics Limited | Health & social care | 2020 |
| Aqua Landscape Solutions Ltd | Administrative & support | 2025 |
| Aqua Purepro Water Filtration UK Ltd | Wholesale & retail | 2025 |
| Aquaforce Rigging & Lifting Services Limited | Professional & scientific | 2020 |
| AR Consultancy NE Limited | Professional & scientific | 2024 |
| AR Homes & Properties Limited | Real estate | 2023 |
| AR Lodgings Limited | Real estate | 2026 |
| AR Marboosh Logistics Limited | Transport & logistics | 2025 |
| AR Northeast Ltd | Real estate | 2013 |
| AR Partnership LLP | | 2025 |
| AR Pilotage Services Ltd | Transport & logistics | 2019 |
| Ar&Bl Consulting Services Limited | Professional & scientific | 2024 |
| Ar&M Investment Holdings Ltd | Financial services | 2024 |
| Arabia Interiors Ltd | Other services | 2024 |
| Araiz Enterprises Ltd | Wholesale & retail | 2025 |
| Aran Adami Ltd | Hospitality | 2026 |
| Arcada Trading Limited | Real estate | 2005 |
| Arcadian Security Ltd | Other services | 2017 |
| Arcane Syndicate Ltd | Manufacturing | 2025 |
| Archibald Walker Estates Ltd | Real estate | 2025 |
| Architect Knowhow Limited | Professional & scientific | 2021 |
| ARCHITECTURE585 Limited | Professional & scientific | 2025 |
| Archurst Limited | Professional & scientific | 2008 |
| Arcvision Solutions Limited | Construction | 2025 |
| Ardora Group Limited | Financial services | 2025 |