| 10 Media Limited | Extraterritorial | 2009 |
| 12 Poulton Tandoori Ltd | Hospitality | 2025 |
| 123TAXIS Ltd | Transport & logistics | 2016 |
| 21ST Century Self Storage Limited | Transport & logistics | 1992 |
| 21ST Century Trade Windows Limited | Construction | 2013 |
| 21ST Century Window Centres Limited | Construction | 2012 |
| 21ST Century Windows Ltd | Manufacturing | 1987 |
| 33 AM Limited | Financial services | 2026 |
| 371 Success Limited | Professional & scientific | 2026 |
| A Boyce Investment Ltd | Real estate | 2021 |
| A J Clarkson Builders Limited | Construction | 2005 |
| A Little BIT of ISH Ltd | Hospitality | 2021 |
| A SE Anar Holdings Limited | Real estate | 2021 |
| A Soul Rebel Production Ltd | Information & communication | 2024 |
| A&A Care at Heart Limited | Health & social care | 2026 |
| A'Porto Limited | Other services | 2013 |
| A. Wade Electrical Limited | Energy | 2018 |
| A.Bradshaw Steel Erectors Ltd | Construction | 2026 |
| A.G. Cross Limited | Other services | 2002 |
| Aandlwhippys Ltd | Hospitality | 2025 |
| Abode Building Surveyors Limited | Professional & scientific | 2017 |
| Abode Healthcare Ltd | Health & social care | 2022 |
| Abode One Ltd | Information & communication | 2022 |
| Abrago Limited | Real estate | 2015 |
| Abrianna Ltd | Wholesale & retail | 2022 |
| AC Taylor Properties Ltd | Real estate | 2022 |
| Account Ability Wyre Ltd | Professional & scientific | 2014 |
| Accountancy Services International Limited | Professional & scientific | 2015 |
| Actorsfit Limited | Arts & recreation | 2022 |
| Adam Smalley Racing & Promotions Limited | Arts & recreation | 2016 |
| Addison Court Limited | Hospitality | 2001 |
| ADF Housing Ltd | Real estate | 2024 |
| Adrian Reed Developments Limited | Real estate | 2022 |
| Advanced Aluminium (UK) Limited | Professional & scientific | 2007 |
| Advanced Aluminium Limited | Professional & scientific | 2007 |
| Advantage Productions UK Ltd | Administrative & support | 2019 |
| Aethelwulf Services Ltd | Information & communication | 2010 |
| Aetheris Consult Ltd | Information & communication | 2023 |
| Affordable 21ST Century EOT Limited | Administrative & support | 2017 |
| Affordable Aluminium Limited | Manufacturing | 2012 |
| Affordable Aluminium Systems Limited | Real estate | 2006 |
| Affordable Window Systems Limited | Manufacturing | 1992 |
| AFN QA Limited | Information & communication | 2024 |
| AGA Fire Consultancy Ltd | Public administration | 2016 |
| Agile Group Training Ltd | Professional & scientific | 2025 |
| Agora (BU) Ltd | Hospitality | 2017 |
| Agri Tech Supplies Ltd | Wholesale & retail | 2025 |
| Agua Fortis Limited | Professional & scientific | 2015 |
| AH Electrical (Blackpool) Limited | Construction | 2019 |
| AIM & Ales Limited | Hospitality | 2025 |
| Aireys Wine Store Ltd | Wholesale & retail | 2023 |
| AJH Ltd | Professional & scientific | 2025 |
| AJS NW Ltd | Transport & logistics | 2026 |
| Al's Skate Shop Deeside Ltd | Wholesale & retail | 2023 |
| Al's Skate Shop Limited | Wholesale & retail | 2012 |
| Albadawi Medical Ltd | Health & social care | 2026 |
| Alfresco Brands Ltd | Wholesale & retail | 2019 |
| Alker Travel Ltd | Transport & logistics | 2017 |
| Alkers Solicitors Ltd | Professional & scientific | 2019 |
| ALL Counties Health Care Ltd | Health & social care | 2023 |
| ALL in Property 247 Ltd | Administrative & support | 2025 |
| Allday Property Limited | Real estate | 2018 |
| Allyouwillneed Ltd | Construction | 2025 |
| Alpha Global Consulting Ltd | Administrative & support | 2022 |
| Always First 4 Fixings Limited | Wholesale & retail | 2021 |
| Amounderness Insurance Services Limited | Financial services | 2010 |
| Ampo Properties Limited | Real estate | 2019 |
| AMS Pro Care Limited | Health & social care | 2022 |
| Anchor IT Solutions Limited | Information & communication | 2014 |
| Anibur Ltd | Health & social care | 2023 |
| Anthony Graham Projects Limited | Professional & scientific | 2005 |
| Antique Street Limited | Wholesale & retail | 2013 |
| Anton Rosenfield Financial Planning Ltd | Financial services | 2012 |
| Anya ELY Limited | Other services | 2026 |
| Apex Moto Competitions Ltd | Wholesale & retail | 2026 |
| Apex Scaffolding and Safety Decking Limited | Construction | 2009 |
| Appletree Financial Solutions Limited | Financial services | 2005 |
| Aquagas (NW) Limited | Professional & scientific | 2020 |
| Archer Cooper Ltd | Information & communication | 2012 |
| Archie Webster Engineering Limited | Professional & scientific | 2016 |
| ARH Bars Limited | Hospitality | 2024 |
| ARH Leisure Events Ltd | Administrative & support | 2020 |
| ARH Leisure Group Limited | Professional & scientific | 2016 |
| ARH Properties NW Limited | Real estate | 2024 |
| ARL Events Ltd | Hospitality | 2026 |
| Armarge Limited | Other services | 2015 |
| Array Digital Ltd | Information & communication | 2023 |
| As-Ss Pro Care Limited | Health & social care | 2022 |
| Ascribe Administrative Services Ltd | Financial services | 2013 |
| Ashbold Partners Ltd | Administrative & support | 2021 |
| Ashfield News Ltd | Wholesale & retail | 2023 |
| Ashvin Group Holdings Limited | Wholesale & retail | 2019 |
| Ashvin Metals (Midlands) Limited | Wholesale & retail | 1983 |
| Ashvin Metals Ltd | Wholesale & retail | 2011 |
| ASK Property Rentals Ltd | Real estate | 2019 |
| Askal Limited | Professional & scientific | 2012 |
| ATE Consultancy Limited | Other services | 2021 |
| Atticus Services & Company Limited | Professional & scientific | 2014 |
| Auburn Aesthetics Limited | Other services | 2022 |
| Audio Visual Media Services Limited | Wholesale & retail | 2024 |