| AD Prop Solutions Ltd | Construction | 2026 |
| Adac Property Ltd | Hospitality | 2026 |
| Adalace Innovations Ltd | Information & communication | 2024 |
| Adam Arshad Consulting Limited | Professional & scientific | 2026 |
| Adam Business Centre Ltd | Real estate | 2024 |
| Adam Events Ltd | Arts & recreation | 2024 |
| Adam GAS & Energy Services Limited | Construction | 2015 |
| Adam Property Group Ltd | Construction | 2024 |
| Adam Simmons and Associates Limited | Professional & scientific | 2003 |
| Adam-Locums Ltd | Health & social care | 2010 |
| Adams Holdings Ltd | Financial services | 2020 |
| ADB Alarms Group Ltd | Professional & scientific | 2017 |
| ADB Alarms Northern Ltd | Administrative & support | 2017 |
| ADB Alarms Response Ltd | Administrative & support | 2017 |
| ADB Alarms Services Ltd | Administrative & support | 2017 |
| ADB Alarms Southern Ltd | Other services | 2010 |
| ADB Coaching Ltd | Arts & recreation | 2026 |
| ADD Plus Ltd | Wholesale & retail | 2025 |
| Adderley Green Medical Services Ltd | Health & social care | 2016 |
| Addison Motors Limited | Wholesale & retail | 1962 |
| Addo Consulting Limited | Administrative & support | 2014 |
| ADE Estates Ltd | Real estate | 2025 |
| ADE Wellington Consultant Ltd | Real estate | 2023 |
| Adelina Jhon Ltd | Wholesale & retail | 2022 |
| Adem 1 Ltd | Hospitality | 2023 |
| ADF Direct Services Limited | Extraterritorial | 2025 |
| ADG Group Limited | Financial services | 2022 |
| Adhoc Admin Staffs Ltd | Administrative & support | 2026 |
| ADI Panda Services Ltd. | Construction | 2016 |
| Adils Kebabish Ltd | Hospitality | 2016 |
| Adios Logistics Limited | Transport & logistics | 2017 |
| Adivani Limited | Health & social care | 2023 |
| Adlp Limited | Real estate | 2016 |
| ADM Exos Limited | Administrative & support | 2019 |
| ADN Stores Limited | Wholesale & retail | 2019 |
| Adoflex Limited | Wholesale & retail | 2019 |
| Adora Global Limited | Administrative & support | 2025 |
| Adorable Desserts Ltd | Hospitality | 2020 |
| Adored Beauty Ltd | Other services | 2022 |
| Adored Bespoke Creations Ltd | Wholesale & retail | 2024 |
| ADR Ground Care Ltd | Administrative & support | 2024 |
| Adrian Jackpot Lewis Limited | Arts & recreation | 2015 |
| Adrian James Jones Landscape Consultant Limited | Professional & scientific | 2015 |
| Adrian Knapper Estate Agent Limited | Real estate | 2022 |
| Adrian Thompson Limited | Professional & scientific | 2002 |
| Adriana Trans Ltd | Transport & logistics | 2018 |
| ADS Joinery (S-O-T) Ltd | Construction | 2011 |
| Adsurge Limited | Information & communication | 2025 |
| Adtec Screen & Digital Supplies Ltd | Extraterritorial | 2016 |
| Advance Mortgage Solutions (UK) Ltd | Financial services | 2001 |
| Advance Project Consultancy Limited | Professional & scientific | 2019 |
| Advanced Learning Academy Limited | Education | 2021 |
| Advanced Materials Solutions Limited | Professional & scientific | 2003 |
| Advanced Packaging Limited | Manufacturing | 1999 |
| Advanced Packaging Solutions Limited | Administrative & support | 2009 |
| Advanced Security Automotive Ltd | Wholesale & retail | 2026 |
| Advanced Vinyl Applications Ltd | Other services | 2026 |
| Advantage Advisory Limited | Professional & scientific | 2017 |
| Advantage Care Ltd | Health & social care | 2022 |
| Advantage HR Ltd | Professional & scientific | 2026 |
| Advantage Pest Control & Gardening Services Limited | Administrative & support | 2003 |
| Advantage Travel Ltd | Transport & logistics | 2024 |
| Adventure Enterprises Limited | Arts & recreation | 1980 |
| Adverra Ltd | Professional & scientific | 2026 |
| Advice Done Differently Ltd | Professional & scientific | 2025 |
| Advocacy Agency Ltd | Professional & scientific | 2020 |
| Advocacy for YOU CIC | Health & social care | 2024 |
| Advocacy Rights PMA Ltd | Wholesale & retail | 2018 |
| ADW Property Holdings Ltd | Real estate | 2019 |
| ADZ Aviation Ltd | Professional & scientific | 2017 |
| AE Bootcamp Ltd | Information & communication | 2024 |
| AE Plumbing Ltd | Construction | 2025 |
| Aegean Consultants Limited | Professional & scientific | 2020 |
| AEI Electrical Services Ltd | Construction | 2018 |
| Aeml Water Solutions Ltd | Construction | 2024 |
| AEN Convenience Ltd | Wholesale & retail | 2025 |
| Aeolus Aerial Pictures Limited | Information & communication | 2016 |
| Aero Travel Extras Limited | Administrative & support | 2019 |
| Aeroford Engineering Limited | Administrative & support | 2016 |
| Aeroserve Limited | Transport & logistics | 2025 |
| Aesential Ltd | Wholesale & retail | 2025 |
| Aesthetics by Emily Rose Ltd | Other services | 2024 |
| Aevionyx Group Ltd | Transport & logistics | 2026 |
| AF Gaming UK Limited | Financial services | 2012 |
| AFA Distributors Ltd | Wholesale & retail | 2024 |
| AFC Burslem CIC | Arts & recreation | 2026 |
| AFF Builders Ltd | Construction | 2024 |
| Affaan Sattar Limited | Construction | 2021 |
| Affinity Design and Management Limited | Construction | 2016 |
| Affinity Editorial Limited | Information & communication | 2021 |
| Afford Builders Ltd | Construction | 2024 |
| Afford Carpets Ltd | Wholesale & retail | 2019 |
| Afford Rent a Car Limited | Extraterritorial | 2017 |
| Affordable Car Finance Limited | Wholesale & retail | 2018 |
| Affordable Equine Limited | Agriculture & fishing | 2021 |
| Affordable IT Solutions Limited | Other services | 2014 |
| Affordable Motor Sales Ltd | Wholesale & retail | 2025 |
| Afghan Palace Stoke Limited | Hospitality | 2025 |
| Afifamazondel Limited | Transport & logistics | 2025 |
| AFM Auto Garage Limited | Wholesale & retail | 2022 |