| Adoboware Limited | Professional & scientific | 2016 |
| Adoma Properties Ltd | Real estate | 2024 |
| Adonai Nissi Value Limited | Real estate | 2007 |
| Adonia Aesthetics Manchester Ltd | Other services | 2016 |
| Adonia by Cake Limited | Health & social care | 2021 |
| Adopt a Ghostling Ltd | Wholesale & retail | 2024 |
| Adorable Steps Childcare Limited | Education | 2018 |
| Adorable Steps Day Nursery Ltd | Health & social care | 2021 |
| Adorable Tots Ltd | Wholesale & retail | 2007 |
| Adore Hairdressing Ltd | Other services | 2018 |
| Adore New Beginnings Ltd | Health & social care | 2019 |
| Adore Property Lets Ltd | Real estate | 2026 |
| Adore Sports Ltd | Professional & scientific | 2021 |
| Adore Venues Limited | Real estate | 2023 |
| Adore Wellbeing Ltd | Health & social care | 2019 |
| Adored Events Limited | Other services | 2021 |
| Adorn Attire Ltd | Wholesale & retail | 2024 |
| Adoucisse Ltd | Wholesale & retail | 2025 |
| ADP Call Centres Ltd | Administrative & support | 2000 |
| ADP Fragrance and Beauty Limited | Wholesale & retail | 2023 |
| ADP Renovations Limited | Construction | 2025 |
| Adplify Ltd | Information & communication | 2025 |
| Adprops Limited | Information & communication | 2010 |
| ADR Consultants Ltd | Professional & scientific | 2017 |
| ADR Trading Limited | Wholesale & retail | 2025 |
| Adra (MCR) Ltd | Hospitality | 2019 |
| Adrak Solutions Ltd | Information & communication | 2017 |
| Adrenaline Escape Atherton Ltd | Arts & recreation | 2015 |
| Adrian Buckley IIP Settlement 2003 Limited | Professional & scientific | 2003 |
| Adrian Francis (Holdings) Limited | Administrative & support | 2008 |
| Adrian Francis Group Limited | Financial services | 2012 |
| Adrian Francis Limited | Water & waste | 2017 |
| Adrian Jennings Limited | Health & social care | 2007 |
| Adrian Wilkinson Real Estate Limited | Real estate | 2025 |
| Adrien Logistics Services Ltd | Transport & logistics | 2025 |
| Adris Holdings Limited | Real estate | 2023 |
| Adrishan Ltd | Wholesale & retail | 2025 |
| Adroit Condiments Limited | Manufacturing | 2023 |
| Adroit Consultancy Limited | Professional & scientific | 2020 |
| Adroit Developers Limited | Construction | 2023 |
| Adroit Tuition Ltd | Education | 2023 |
| Adroitize Ltd | Wholesale & retail | 2025 |
| Adroitsols Nexus Limited | Information & communication | 2023 |
| Adron Services Limited | Other services | 2018 |
| Adrox Consulting Ltd. | Administrative & support | 2020 |
| ADS & Marketing Ltd | Professional & scientific | 2021 |
| ADS Bouncy Castles Ltd | Arts & recreation | 2021 |
| ADS GAS Services Ltd | Professional & scientific | 2022 |
| ADS House Ltd | Real estate | 2023 |
| ADS Medical Group Ltd | Health & social care | 2023 |
| ADS Sales Ltd | Professional & scientific | 2024 |
| ADS Windows (NE) Ltd | Construction | 2025 |
| ADS Windows Limited | Construction | 2015 |
| Adsight Ltd | Financial services | 2025 |
| Adsk Creative Studio Ltd | Information & communication | 2024 |
| Adski Ltd | Wholesale & retail | 2023 |
| Adsmart UK Ltd | Information & communication | 2015 |
| Adsquare Limited | Information & communication | 2020 |
| Adssphere Networks Ltd | Information & communication | 2025 |
| Adstra Capital Limited | Real estate | 2025 |
| Adstra Investments Limited | Real estate | 2024 |
| Adstra Limited | Wholesale & retail | 2022 |
| Adstra Property Limited | Real estate | 2024 |
| ADT Traffic Services Ltd | Construction | 2022 |
| ADT Workplace (Holdings) Limited | Financial services | 2019 |
| ADT Workplace Limited | Construction | 2004 |
| Adtc Ltd. | Professional & scientific | 1995 |
| Adtg Ltd | Wholesale & retail | 2025 |
| Adtraction UK Ltd | Information & communication | 2019 |
| Adukkha Limited | Health & social care | 2013 |
| Adulis Afro Shop Ltd | Wholesale & retail | 2025 |
| Adunni Taste Kitchen Ltd | Hospitality | 2025 |
| ADV Security Limited | Administrative & support | 2014 |
| Advance - Phoenix Training Enterprise | Education | 2019 |
| Advance Acquisitions Ltd | Real estate | 2017 |
| Advance Advertising Limited | | 1980 |
| Advance Applicator Solutions Limited | Wholesale & retail | 2021 |
| Advance Creatives Limited | Administrative & support | 2025 |
| Advance Filtration Systems Limited | Wholesale & retail | 1995 |
| Advance Flavour Solutions Limited | Administrative & support | 2017 |
| Advance Global Training Limited | Professional & scientific | 2019 |
| Advance Health North Ltd | Health & social care | 2016 |
| Advance Immobiliare Ltd | Real estate | 2024 |
| Advance Marketing (PVT) Ltd | Administrative & support | 2013 |
| Advance Media Technologies Ltd | Real estate | 2024 |
| Advance Medical Case Management Limited | Health & social care | 2011 |
| Advance Project Ltd | Hospitality | 2024 |
| Advance Roofing North West Ltd | Construction | 2026 |
| Advance Services Group Ltd | Information & communication | 2019 |
| Advance Windows Repair Ltd | Construction | 2018 |
| Advanced Aesthetics Technology Limited | Other services | 2011 |
| Advanced Analysis and Integration Ltd | Administrative & support | 2001 |
| Advanced Basics 2.0 Ltd | Health & social care | 2023 |
| Advanced Biofuel Solutions Ltd | Manufacturing | 2019 |
| Advanced Business Limited | Wholesale & retail | 2018 |
| Advanced Business Ventures Limited | Administrative & support | 2017 |
| Advanced Carbons Council Limited | Professional & scientific | 2020 |
| Advanced Cardiology Ltd | Health & social care | 2019 |
| Advanced Care and Support Ltd | Public administration | 2025 |
| Advanced Cladding Systems Ltd | Construction | 2024 |