| AH Vehicle Holdings Ltd | Financial services | 2025 |
| AH Vehicle Prep & Storage Ltd | Transport & logistics | 2025 |
| AHR Motors Limited | Wholesale & retail | 2023 |
| Ahsan Healthcare Limited | Health & social care | 2025 |
| Ahuike DI EFE Ltd | Health & social care | 2022 |
| AIK Advisory Ltd | Information & communication | 2023 |
| AIK Investments Limited | Administrative & support | 2015 |
| Aikf Limited | Wholesale & retail | 2025 |
| Ailar Limited | Information & communication | 2022 |
| Aim-For Solutions Ltd. | Information & communication | 2013 |
| Air Movement Design (Northern) Limited | Construction | 2007 |
| Airconone (Halifax) Ltd | Manufacturing | 2012 |
| Aire the Label Ltd | Wholesale & retail | 2024 |
| Aire Wharfe DAB Ltd | Information & communication | 2023 |
| Airlie Business Solutions Limited | Professional & scientific | 2015 |
| Airobowl Limited | Arts & recreation | 2026 |
| Airtime Halifax Ltd | Arts & recreation | 2017 |
| AIS Property Holdings Ltd | Real estate | 2025 |
| AIS2 Ltd | Construction | 2026 |
| Aisha Bennett Collective Ltd | Professional & scientific | 2026 |
| Aisight Global Ltd | Professional & scientific | 2023 |
| Aislaby Heights Halifax Limited | Administrative & support | 2015 |
| Aisling Burke Ltd | Wholesale & retail | 2024 |
| Aiyat Ltd | Real estate | 2025 |
| AJ Dental Healthcare Ltd | Health & social care | 2025 |
| AJ Jointing Services Ltd | Energy | 2023 |
| AJ Motors Yorkshire Ltd | Wholesale & retail | 2018 |
| AJ Phoenix Consulting Ltd | Financial services | 2026 |
| AJ Scaffolding (Halifax) Ltd | Construction | 2025 |
| AJ2 Developments Ltd | Real estate | 2026 |
| AJB Automotive Consultancy Ltd | Professional & scientific | 2024 |
| AJB School Support Ltd | Education | 2017 |
| Ajhc Consultants Ltd | Wholesale & retail | 2026 |
| AJI Installations Ltd | Construction | 2019 |
| Ajjb Law Limited | Professional & scientific | 2019 |
| AJR Consultancy Services Ltd | Professional & scientific | 2025 |
| Ajsono Ltd | Health & social care | 2024 |
| AK Autosport Ltd | Wholesale & retail | 2021 |
| AK Electric and Construction Ltd | Construction | 2024 |
| AK Medical Yorkshire Ltd | Professional & scientific | 2017 |
| AK Motors Bolton Ltd | Wholesale & retail | 2021 |
| AKE Specialist Investigations Limited | Administrative & support | 2024 |
| Akeds Road Motors & Bodyshop Ltd | Wholesale & retail | 2024 |
| AKF MED Ltd | Health & social care | 2022 |
| AKJ Property 6 Ltd | Real estate | 2024 |
| AKL Consulting Ltd | Professional & scientific | 2014 |
| AKM Logistics Ltd | Transport & logistics | 2020 |
| Aktiv Retail Ltd | Wholesale & retail | 2025 |
| Aktiv Wholesale Ltd | Wholesale & retail | 2025 |
| AKZ & SG Ltd | Wholesale & retail | 2025 |
| AL Qalam Investments Ltd | Real estate | 2026 |
| AL Saaf Foundation Ltd | Professional & scientific | 2020 |
| Al&Dan Ltd | Information & communication | 2023 |
| Al-Amin Sons Trading Limited | Real estate | 2023 |
| Al-Haatif Limited | Wholesale & retail | 2010 |
| Alaeli Limited | Hospitality | 2024 |
| Alam Law Ltd | Professional & scientific | 2017 |
| Alan Armitage Limited | Construction | 2017 |
| Alan Caine Agencies Limited | Administrative & support | 2003 |
| Alarmtech Security Limited | Administrative & support | 2008 |
| Alaykhan Legal Services Ltd. | Extraterritorial | 2018 |
| Alba Proteins Penrith Limited | Manufacturing | 2006 |
| Albanyview Limited | Real estate | 1995 |
| Albert Road Community Hub Limited | Arts & recreation | 2018 |
| Albeth Projects Ltd | Construction | 2024 |
| Albi Chiara Ltd | Hospitality | 2019 |
| Alcyone Academy Ltd | Education | 2025 |
| Alex Muff Consultants Ltd | Health & social care | 2025 |
| Alex Wood Building and Roofing Limited | Construction | 2013 |
| Alexander Jack Group Limited | Professional & scientific | 2019 |
| Alexander Procurement Limited | Professional & scientific | 2022 |
| Alexanderttrpg Ltd | Information & communication | 2024 |
| Alexandra Dudley Limited | Professional & scientific | 2016 |
| Alfie Noakes Limited | Financial services | 2013 |
| ALFIE-32CRABSTICKS Ltd | Arts & recreation | 2015 |
| Alfred a Dunhill Limited | Manufacturing | 2025 |
| Alfred Stones Limited | Manufacturing | 2012 |
| ALG Developments (Yorkshire) Limited | Extraterritorial | 2020 |
| Alhambra Dolci Limited | Financial services | 2019 |
| Alhambra Legal Consulting Limited | Professional & scientific | 2010 |
| Alhambra Maisons Limited | Real estate | 2020 |
| Aligner Cases Ltd | Wholesale & retail | 2023 |
| Aline Fabrication Ltd | Professional & scientific | 2024 |
| Ali’S MOT Limited | Wholesale & retail | 2018 |
| Alkebulan Enterprise Ltd | Professional & scientific | 2022 |
| ALL About Socials Ltd | Professional & scientific | 2025 |
| ALL About Windows & Doors Ltd | Construction | 2025 |
| ALL Elite Physio Ltd | Health & social care | 2025 |
| ALL in 22 Limited | Other services | 2015 |
| ALL in Line Ltd | Professional & scientific | 2025 |
| ALL IS Well Women CIC | Education | 2024 |
| ALL Paws Pet Grooming Ltd | Other services | 2025 |
| ALL Pizzetto 2 Ltd | Hospitality | 2022 |
| ALL Pizzetto 3 Ltd | Hospitality | 2024 |
| ALL Starz Deserts Limited | Wholesale & retail | 2018 |
| Alliance Office Systems Limited | Manufacturing | 1994 |
| Alliz Playgym Ltd | Arts & recreation | 2015 |
| Allsortz UK Retail Ltd | Wholesale & retail | 2013 |
| Allstarz Desserts Sowbery Bridge Limited | Hospitality | 2020 |
| Allus Engineering Solutions Ltd | Professional & scientific | 2022 |