| Adept Surgical Ltd | Health & social care | 2015 |
| Aderic Professional Services Limited | Hospitality | 2025 |
| Aders Consulting Company Ltd | Information & communication | 2025 |
| Ades Consultancy UK Limited | Health & social care | 2023 |
| Ades-Healthcare-Uk Ltd | Health & social care | 2024 |
| Adescentuary Ltd | Wholesale & retail | 2025 |
| Adesho & SON Security Limited | Financial services | 2025 |
| Adetokunbo Limited | Transport & logistics | 2026 |
| Adew Properties Ltd | Real estate | 2020 |
| Adewale Services Ltd | Transport & logistics | 2021 |
| Adex Global Limited | Real estate | 2021 |
| Adex Medical Staffing Ltd | Administrative & support | 2023 |
| Adex Solutions International Ltd | Construction | 2024 |
| Adexcare House Ltd | Health & social care | 2014 |
| Adexson Ltd | Other services | 2024 |
| ADF Car Sales Limited | Wholesale & retail | 2020 |
| ADF Construction Services Limited | Construction | 2025 |
| ADF Consultancy Ltd | Professional & scientific | 2024 |
| ADF Homes Limited | Real estate | 2026 |
| ADF NDT Services Limited | Professional & scientific | 2022 |
| Adflair Funnels Ltd | Administrative & support | 2025 |
| ADG Leisure Ltd | Hospitality | 2012 |
| Adgespeed Limited | Arts & recreation | 2006 |
| ADH Property Holdings Ltd | Real estate | 2024 |
| Adhd Astute Ltd | Health & social care | 2023 |
| Adhd Remapped Ltd | Other services | 2024 |
| Adhunic Ltd | Health & social care | 2024 |
| ADI Apparels Ltd | Wholesale & retail | 2016 |
| ADI Maintenance Solutions Ltd | Construction | 2023 |
| Adiahama Healthcare Ltd | Health & social care | 2026 |
| Adiat Homes Ltd | Wholesale & retail | 2022 |
| Adiau Homes Ltd | Real estate | 2022 |
| Adibo Limited | Construction | 2026 |
| Adidave Ltd | Real estate | 2022 |
| Adidol Production Ltd | Information & communication | 2025 |
| Adil & Co (UK) Ltd | Hospitality | 2017 |
| Adim Ltd | Information & communication | 2025 |
| Adiman UK Ltd | Wholesale & retail | 2024 |
| Adimbro Sports Management Ltd | Professional & scientific | 2019 |
| Adina Rachel Moore Ltd | Real estate | 2010 |
| Adipet UK Ltd | Wholesale & retail | 2024 |
| Adisa Wholesale Limited | Wholesale & retail | 2026 |
| Adit Media Ltd | Wholesale & retail | 2025 |
| Aditan Properties Limited | Real estate | 2023 |
| Adithi Investments Ltd | Real estate | 2024 |
| Adizat Ltd | Health & social care | 2023 |
| ADJ Enterprises Ltd | Wholesale & retail | 2025 |
| Adjei Consultancy Ltd | Information & communication | 2024 |
| Adjei Estate Ltd | Real estate | 2024 |
| Adjuvantes Employment Limited | Administrative & support | 2016 |
| Adjuvantes Limited | Administrative & support | 2013 |
| Adjuvo (Midlands) Support for Living Ltd | Health & social care | 2017 |
| Adjuvo Care Essex Limited | Health & social care | 2007 |
| ADK 24HR Building Maintenance Ltd | Construction | 2013 |
| ADK Enterprise Limited | Wholesale & retail | 2023 |
| ADK Wholesale Limited | Wholesale & retail | 2025 |
| Adkaye Services Limited | Other services | 2022 |
| Adkins Associates Limited | Professional & scientific | 2001 |
| ADL 88 Limited | Professional & scientific | 2017 |
| ADL Asset Testing Limited | Administrative & support | 2024 |
| ADL Executive Cars Ltd | Transport & logistics | 2007 |
| ADL Financial Contracting Limited | Professional & scientific | 2016 |
| ADL Groundworks Ltd | Construction | 2020 |
| ADL Lifestyle & Concierge Ltd | Transport & logistics | 2018 |
| ADL Mechanical Services Ltd | Construction | 2019 |
| ADL Rehab Ltd | Administrative & support | 2015 |
| ADL Safety Assured Limited | Other services | 2021 |
| ADL Talent Solutions Ltd | Administrative & support | 2025 |
| Adlads.Construction Ltd | Construction | 2024 |
| Adlb Holdings Limited | Financial services | 2025 |
| Adlington Land Limited | Construction | 2018 |
| Adlington Spice Limited | Hospitality | 2016 |
| ADM Design and Build Ltd | Construction | 2025 |
| ADM Property and Development Limited | Real estate | 2025 |
| ADM Trade and Lettings Limited | Real estate | 2017 |
| Admagpublications Limited | Information & communication | 2017 |
| Admconsult Ltd | Professional & scientific | 2021 |
| Admf Productions Ltd | Administrative & support | 2017 |
| Admine Advertising & Marketing Ltd | Real estate | 2024 |
| Adminion Ltd | Information & communication | 2004 |
| Adminverse Ltd | Public administration | 2025 |
| Admiral Clothing Limited | Wholesale & retail | 2025 |
| Admiral Fish and Grill Limited | Hospitality | 2020 |
| Admire Consulting Ltd | Administrative & support | 2015 |
| Admire Marketing Limited | Professional & scientific | 2012 |
| Admired Solutions Limited | Financial services | 2021 |
| Admission Help Ltd | Education | 2020 |
| Admv Ltd | Construction | 2022 |
| Adnaan Limited | Professional & scientific | 2012 |
| Adnab Healthcare Ltd | Health & social care | 2019 |
| Adnan General Trade Co., Ltd | Wholesale & retail | 2021 |
| Adnan Khan Films Ltd | Information & communication | 2023 |
| Adnan Malik Limited | Professional & scientific | 2018 |
| Adnan Mohammed Abdo for Trading Ltd | Wholesale & retail | 2021 |
| Adnan Pizzas Ltd | Hospitality | 2021 |
| Adnan Sawadi for Investment Ltd | Wholesale & retail | 2021 |
| Adnans Hyde Ltd | Hospitality | 2019 |
| Adnexo Ltd | Information & communication | 2024 |
| Adnsa Limited | Wholesale & retail | 2025 |
| Adoam Limited | Transport & logistics | 2019 |