| Adel Web Design Ltd | Information & communication | 2020 |
| Adel Wood Landscaping Ltd | Administrative & support | 2024 |
| Adel Wood Store Limited | Wholesale & retail | 2014 |
| Adelaide Medical Ltd | Health & social care | 2025 |
| Adelpine Ltd | Wholesale & retail | 2023 |
| Ademaro Balica Limited | Transport & logistics | 2025 |
| Adeok Limited | Administrative & support | 2019 |
| Adept Communications and Technology Limited | Information & communication | 2003 |
| Adept Computer Services Limited | Manufacturing | 2004 |
| Adept GAS Heating Ltd | Construction | 2020 |
| Adept Insight Ltd | Other services | 2016 |
| Adept PCV Solutions Ltd | Transport & logistics | 2025 |
| Adept Training Platforms Ltd | Information & communication | 2026 |
| Aderinto Orthopaedics Limited | Health & social care | 2010 |
| Adewale Cloud Consulting Ltd | Information & communication | 2021 |
| ADF Accountancy Limited | Professional & scientific | 2019 |
| Adframe Limited | Professional & scientific | 2025 |
| Adframe Partnerships Limited | Real estate | 2025 |
| ADG Properties Limited | Real estate | 2023 |
| ADG Property Management Limited | Real estate | 2026 |
| ADH Green Energy Limited | Construction | 2025 |
| Adhera Limited | Information & communication | 2017 |
| Adheradata Limited | Information & communication | 2018 |
| Adheradispensing Limited | Information & communication | 2018 |
| ADI Logo R US Ltd | Administrative & support | 2025 |
| ADI1 Detailing Ltd | Wholesale & retail | 2025 |
| Adiara Properties Limited | Real estate | 2025 |
| Adiepena Ltd | Health & social care | 2021 |
| Adies York Ltd | Construction | 2021 |
| Adify Digital Ltd | Professional & scientific | 2025 |
| Adijess Ltd | Health & social care | 2025 |
| Adil Anwar Ltd | Other services | 2017 |
| Adilco Accountants Limited | Professional & scientific | 2026 |
| Adinova Global Ltd | Wholesale & retail | 2026 |
| Adir Ltd | Wholesale & retail | 2026 |
| Aditel Rigging Ltd | Information & communication | 2016 |
| Aditi IT Solutions Limited | Information & communication | 2011 |
| ADJ and OBJ Limited | Wholesale & retail | 2026 |
| Adjusted SET Limited | Administrative & support | 2021 |
| Adjuvo Ltd | Administrative & support | 2013 |
| ADK Consultants Ltd | Information & communication | 2021 |
| ADK Property Group Ltd | Real estate | 2020 |
| Adk-Cube Property Ltd | Real estate | 2020 |
| Adkin and Thackray Roofing Ltd | Construction | 2022 |
| Adkin Joinery Ltd | Construction | 2025 |
| Adkol Limited | Wholesale & retail | 2021 |
| ADL Aesthetics Ltd | Health & social care | 2022 |
| Adlan for Trade & Services Ltd | Wholesale & retail | 2023 |
| Adley Gray Limited | Professional & scientific | 2023 |
| Adlie Limited | Professional & scientific | 2022 |
| Adlow Brick and Cement Limited | | 1977 |
| ADM Financial Services Ltd | Financial services | 2022 |
| ADM Number 2 Ltd | Transport & logistics | 2020 |
| Admas Direct Ltd | Wholesale & retail | 2024 |
| Admedicare Ltd | Health & social care | 2025 |
| Admiral Signs Limited | Manufacturing | 1990 |
| Admore Recruitment Limited | Administrative & support | 2009 |
| ADN 99 Limited | Transport & logistics | 2023 |
| ADN Builders 2019 Limited | Construction | 2021 |
| ADN Consultants Ltd | Professional & scientific | 2011 |
| Adnan Global Services Limited | Wholesale & retail | 2026 |
| Adnan Pharma Limited | Wholesale & retail | 2023 |
| Adoba Estates Ltd | Real estate | 2025 |
| Adogrand Resources Limited | Professional & scientific | 2002 |
| Adom Direct Transport Limited | Transport & logistics | 2026 |
| Adonai Property Group Ltd | Real estate | 2026 |
| Adonaii Company Limited | Wholesale & retail | 2025 |
| Adonis (UK) Limited | Administrative & support | 2012 |
| Adopt Healthcare Ltd | Health & social care | 2015 |
| Adoro Limited | Other services | 2025 |
| ADP Primary Care Acquisitions Limited | Administrative & support | 2009 |
| ADP Primary Care Services Limited | Health & social care | 2009 |
| ADP Solutions Limited | Information & communication | 2004 |
| Adran Ltd | Professional & scientific | 2014 |
| Adrenaline Games Ltd | Wholesale & retail | 2023 |
| Adrian 2019 Transport Ltd | Transport & logistics | 2019 |
| Adrian and Lucy Limited | Other services | 2010 |
| Adrian Cleaning and Shine Ltd | Administrative & support | 2022 |
| Adrian Derx Fund KCP 1 L.P. | | 2007 |
| Adrian House Management Co Ltd | Households | 2025 |
| Adrian Kozera Ltd | Wholesale & retail | 2019 |
| Adriana Elena Limited | Transport & logistics | 2025 |
| Adriana Logistics Limited | Transport & logistics | 2023 |
| Adrob Limited | Real estate | 2023 |
| Adroit Plastics Ltd | Manufacturing | 2014 |
| ADS Advanced Driving Solutions Ltd | Transport & logistics | 2015 |
| ADS Thinker Ltd | Information & communication | 2016 |
| ADS Worldwide Ltd | Wholesale & retail | 2026 |
| Adsa Limited | Real estate | 2022 |
| Adsilico Limited | Professional & scientific | 2022 |
| Adsumus Ltd | Professional & scientific | 2011 |
| Adsventures (Marketing) Limited | Information & communication | 2016 |
| ADT Ceilings Limited | Construction | 2008 |
| ADT Motors Limited | Wholesale & retail | 2013 |
| Adulis 64 Limited | Hospitality | 2025 |
| Advacure Limited | Public administration | 2020 |
| Advaita Wellness Ltd | Information & communication | 2025 |
| Advance 2 Go Group CIC | Administrative & support | 2026 |
| Advance Ability Limited | Education | 2022 |
| Advance Connects (Europe) Ltd | Professional & scientific | 2016 |