| Aquasition (UK) Ltd | Professional & scientific | 2014 |
| AR Veritas Consulting Limited | Information & communication | 2025 |
| ARA Cars Ltd | Wholesale & retail | 2025 |
| Aranya Property & Investments Ltd | Real estate | 2025 |
| Arbour Estates Limited | Real estate | 2018 |
| Arbra Services Limited | Health & social care | 2014 |
| Arcadia Travel and Marketing Limited | Financial services | 1981 |
| Area 7 Ltd | Wholesale & retail | 2025 |
| Arena PR Ltd | Professional & scientific | 2019 |
| Argb Limited | Health & social care | 2026 |
| Arkaine Ltd | Wholesale & retail | 2025 |
| Arkway Building and Construction Ltd | Construction | 2018 |
| Arkway Groundworks Ltd | Construction | 2021 |
| Arkway Limited | Construction | 2021 |
| Arkway Plant Hire Ltd | Administrative & support | 2024 |
| Arlo Brothers Ltd | Wholesale & retail | 2024 |
| ARM Grab Hire Ltd | Water & waste | 2014 |
| Armaan M Ltd | Transport & logistics | 2025 |
| Armitage Rest Homes Limited | Extraterritorial | 1999 |
| Armour Glass Limited | Manufacturing | 2009 |
| Aroma of Jesus Ministries | Other services | 2009 |
| Aron Clothing Ltd | Wholesale & retail | 2026 |
| ARP Keighley Ltd | Other services | 2022 |
| Arrond Ltd | Wholesale & retail | 2024 |
| Arrow House (Shipley) Ltd | Construction | 2021 |
| Arrows Private Hire Limited | Transport & logistics | 2014 |
| ARS Brothers Limited | Other services | 2023 |
| Artechnologiesuk Limited | Information & communication | 2017 |
| Artg Ltd | Real estate | 2025 |
| Arthur Green Transport Limited | Real estate | 1960 |
| Artisan Light Project Ltd | Arts & recreation | 2025 |
| Artmaster Limited | Manufacturing | 2009 |
| Arundel Court (Bradford) Management Company Limited | Households | 1992 |
| Arvensis Packaging Films Limited | Extraterritorial | 2006 |
| Arvid Automotive Ltd | Professional & scientific | 2026 |
| AS Freedom Farm Ltd | Agriculture & fishing | 2021 |
| AS Pharma Services Ltd | Wholesale & retail | 2019 |
| AS PM Ltd | Construction | 2019 |
| ASA Global Foods Limited | Wholesale & retail | 2024 |
| Asap Direct Limited | Transport & logistics | 2014 |
| Asdam UK Holdings Limited | Manufacturing | 2025 |
| Ase-Uk Limited | Wholesale & retail | 2017 |
| Asga Solutions Limited | Transport & logistics | 2026 |
| ASH Mount 1968 Limited | Extraterritorial | 2015 |
| ASH Properties Keighley Limited | Real estate | 2024 |
| Ashlands Garth Limited | Households | 2025 |
| Ashlar Stone Products Limited | Mining & quarrying | 2019 |
| Ashraf Dent Ltd | Health & social care | 2012 |
| Ashraf Property Ltd | Real estate | 2024 |
| Ashtar Ecom Limited | Wholesale & retail | 2024 |
| Aslam Assets Ltd | Real estate | 2024 |
| Aslamdriver 01 Limited | Transport & logistics | 2015 |
| Asra Welfare Trust | Other services | 2011 |
| Assisted Rides Ltd | Transport & logistics | 2025 |
| Associated Rediffusion Ltd | Extraterritorial | 2023 |
| Associazione PER LA Promozione Della Lingua Italiana - PLI Manchester Ltd | Education | 2024 |
| Assured Stairlifts Limited | Manufacturing | 2005 |
| AT Office Limited | Professional & scientific | 2018 |
| Atees Limited | Hospitality | 2025 |
| Atha Machine Tool Assistance Ltd | Manufacturing | 2019 |
| Atkinson & Roberts Ltd | Administrative & support | 2005 |
| Atkinson Associates Limited | Real estate | 2004 |
| Atlas Bargains Limited | Wholesale & retail | 2022 |
| Atlas Halal Stores Ltd | Wholesale & retail | 2025 |
| Atlas Rail Limited | Manufacturing | 2001 |
| Atlas Shawarma One Ltd | Hospitality | 2024 |
| Attock Restaurant Ltd | Hospitality | 2024 |
| AU Gold Bradford Ltd | Wholesale & retail | 2025 |
| Audax Clothing Ltd | Wholesale & retail | 2025 |
| Audio Visual Technologies Ltd | Wholesale & retail | 2019 |
| Augment Accounting Ltd | Professional & scientific | 2025 |
| Authentically Wood Fired Limited | Hospitality | 2012 |
| Auto Fast Fit Limited | Wholesale & retail | 2019 |
| Auto MC Limited | Wholesale & retail | 2018 |
| Autobahn Specialists Ltd | Wholesale & retail | 2024 |
| Autolab Sales and Service Ltd | Wholesale & retail | 2023 |
| Automotive Cars Group Limited | Transport & logistics | 2024 |
| Automotive Cars Limited | Wholesale & retail | 2020 |
| Automotive Garage Services Limited | Manufacturing | 2008 |
| Autoselect Car Sales Limited | Wholesale & retail | 2015 |
| Autotec & David Peel Auto Electricians Ltd | Wholesale & retail | 2002 |
| Autotec Accident Repair Centre Ltd | Wholesale & retail | 2023 |
| Autotech Parts Ltd | Wholesale & retail | 2025 |
| Avadakedavra Ltd | Professional & scientific | 2025 |
| Avanti Childcare Limited | Health & social care | 2019 |
| Avanti Homes (Northern) Limited | Real estate | 2023 |
| Avanti Properties Leaseholds Ltd | Real estate | 2023 |
| Avanti Property Developments Ltd. | Real estate | 1964 |
| Avanti Property Rentals & Management Ltd | Real estate | 2025 |
| Averrose Ltd | Health & social care | 2020 |
| Avidhome Limited | Manufacturing | 1991 |
| AVS Trading Ltd | Wholesale & retail | 2025 |
| Awais Ramzan Limited | Health & social care | 2017 |
| Axentra Trading Solutions Limited | Wholesale & retail | 2026 |
| Axis Prime Logistics Ltd | Transport & logistics | 2026 |
| AXO Leisure Ltd | Manufacturing | 2015 |
| Ayrton Civils Ltd | Construction | 2022 |
| Aysha Siddika Limited | Health & social care | 2022 |
| AZ & Enterprises Limited | Wholesale & retail | 2025 |
| Azaan Travel Limited | Other services | 2015 |