| Adebums Ltd | Health & social care | 2019 |
| Adecan Services Limited | Professional & scientific | 2011 |
| Adecs Limited | Information & communication | 1992 |
| Adecs Training Limited | Administrative & support | 2000 |
| Adegital Ltd | Extraterritorial | 2023 |
| Adegunle and Sons Group of Companies Limited | Wholesale & retail | 2019 |
| Adek Properties Ltd | Real estate | 2021 |
| Adekaz Limited | Manufacturing | 2019 |
| Adeli Clothing Co., Ltd | Manufacturing | 2022 |
| Adelin Logistic Ltd | Transport & logistics | 2016 |
| Adelrose Ltd | Wholesale & retail | 2025 |
| Adens Healthcare Limited | Health & social care | 2023 |
| Adeola Auto Ltd | Wholesale & retail | 2025 |
| Adept Project Solutions Limited | Other services | 2014 |
| Aderma Cosmetics Ltd | Wholesale & retail | 2025 |
| Ades-Cov Ltd | Construction | 2021 |
| Adesal Limited | Information & communication | 2022 |
| Adewale Properties (UK) Limited | Real estate | 2024 |
| ADF Installation Limited | Construction | 2021 |
| Adfinitum Ltd | Education | 2025 |
| Adforet Limited | Wholesale & retail | 2016 |
| ADH Construction Engineering Ltd | Construction | 2016 |
| ADH Imports and Exports Limited | Wholesale & retail | 2025 |
| Adhd Services Ltd | Health & social care | 2026 |
| Adhen Lettings Solutions Ltd | Real estate | 2025 |
| Adhesives and Sealants International Limited | Professional & scientific | 1996 |
| Adhregmi Ltd | Hospitality | 2025 |
| ADI Coventry Ltd | Real estate | 2016 |
| ADI Curier Transport Ltd | Transport & logistics | 2025 |
| ADI Interiors Ltd | Construction | 2022 |
| Adi&Sons Limited | Wholesale & retail | 2019 |
| ADI110 Property Ltd | Real estate | 2024 |
| Adigy Ltd | Professional & scientific | 2025 |
| Adilikram Ltd | Transport & logistics | 2026 |
| Adin Holdings Limited | Real estate | 2026 |
| Adjiboulou Transport Company 0812 Ltd | Transport & logistics | 2025 |
| Adjoined Ltd | Extraterritorial | 2024 |
| ADL Installations Ltd | Construction | 2024 |
| ADL Services Limited | Information & communication | 2019 |
| Adlc Limited | Arts & recreation | 2018 |
| Adler Security Ltd | Administrative & support | 2024 |
| Adlington Limited | Manufacturing | 2009 |
| Adlington Turkeys Limited | Agriculture & fishing | 2013 |
| ADM Coatings Ltd | Professional & scientific | 2026 |
| ADM Corporations Limited | Wholesale & retail | 2020 |
| ADM Foods International Limited | Wholesale & retail | 2024 |
| ADM Groundworks Ltd | Construction | 2018 |
| ADM Trans Limited | Transport & logistics | 2026 |
| Admandemore Services Limited | Transport & logistics | 2025 |
| Admin and Accounts Limited | Professional & scientific | 2012 |
| ADN (Northampton) Limited | Education | 2005 |
| Adntrans Company Ltd | Transport & logistics | 2015 |
| Adomah Ltd | Health & social care | 2024 |
| Adon Cleaning Ltd | Administrative & support | 2025 |
| Adon Consultancy Ltd | Information & communication | 2019 |
| Adon Health Ltd | Health & social care | 2019 |
| Adonai Todj'Rhon Baruch Joseph Lee-Francis Ltd | Extraterritorial | 2022 |
| Adonis Blue Psychology Ltd | Professional & scientific | 2024 |
| Adorable Minds Limited | Manufacturing | 2025 |
| Adore Doors Limited | Wholesale & retail | 2013 |
| Ados Group Ltd | Manufacturing | 2018 |
| Adot Healthcare Limited | Professional & scientific | 2023 |
| ADP Occupational Health and Psychological Services Limited | Health & social care | 2017 |
| ADR Swarn Limited | Professional & scientific | 2020 |
| Adrawings Ltd | Professional & scientific | 2021 |
| Adrenaline Junkie Clothing & Supplements Ltd | Wholesale & retail | 2018 |
| Adrenaline Leisure Limited | Arts & recreation | 2002 |
| Adrian G Construction Ltd | Transport & logistics | 2025 |
| Adrian Murray Counselling Ltd | Health & social care | 2021 |
| Adrian Raduceanu Ltd | Transport & logistics | 2017 |
| Adrian Surveys Ltd | Professional & scientific | 2018 |
| Adrian Wilson Electricals Limited | Construction | 2020 |
| Adrianvoinea Limited | Administrative & support | 2016 |
| Adrinat Ltd | Transport & logistics | 2021 |
| Adroit Gideon Medical Ltd | Health & social care | 2022 |
| ADS Airport Services Limited | Transport & logistics | 1999 |
| ADS Capital Ltd | Real estate | 2023 |
| ADS Care Homes Ltd | Professional & scientific | 2024 |
| ADS Electrical & Plumbing Contractors Ltd | Construction | 2020 |
| ADS Engineering Informatics Limited | Information & communication | 2018 |
| ADS Investment Holdings Ltd | Construction | 2025 |
| Adsc Construction Ltd | Construction | 2026 |
| Adsd Limited | Real estate | 2026 |
| ADT Roofing Service Ltd | Construction | 2026 |
| Adult Model Accountancy Services Limited | Professional & scientific | 2024 |
| Adusman Construction Limited | Construction | 2024 |
| ADV Car Care Services Limited | Other services | 2016 |
| Advance Couriers (UK) Limited | Transport & logistics | 2006 |
| Advance Couriers Holdings(Uk) Limited | Transport & logistics | 2017 |
| Advance Dental Care Swindon Ltd | Health & social care | 2013 |
| Advance RX Limited | Health & social care | 2024 |
| Advance Service Tooling (Coventry) Limited | Manufacturing | 2006 |
| Advance Steel Worx Limited | Manufacturing | 2022 |
| Advanced Basements Ltd | Construction | 2019 |
| Advanced CAD Technology Limited | Information & communication | 2006 |
| Advanced Care Portal Ltd | Health & social care | 2025 |
| Advanced Estates Limited | Real estate | 2004 |
| Advanced Generation Atlantic Farm Limited | Real estate | 2024 |
| Advanced Generation Benview Limited | Real estate | 2024 |
| Advanced Generation Fairwood Lakes Limited | Energy | 2025 |