| Applied Services Limited | Extraterritorial | 2022 |
| Apply Scaffolding Services Limited | Construction | 2012 |
| Approved Group Limited | Wholesale & retail | 2016 |
| Appyoupuncture Limited | Other services | 2024 |
| APU Executive Travel Limited | Transport & logistics | 2011 |
| APW Motorsports Ltd | Professional & scientific | 2020 |
| Aqua Bath Courses & Training Limited | Education | 2025 |
| Aqua Inn Limited | Wholesale & retail | 2006 |
| Aqua Kids Barnsley Ltd | Education | 2016 |
| Aqua Regal Ltd | Wholesale & retail | 2011 |
| Aquaforce Plumbing Solutions Ltd | Construction | 2003 |
| Aquagas Plumbing and Heating Solutions Ltd | Manufacturing | 2008 |
| Aqualess Ltd | Manufacturing | 2022 |
| Aquapaws Canine Hydrotherapy and FUN Swim Ltd | Agriculture & fishing | 2022 |
| Aquarius Holdings Ltd | Financial services | 2018 |
| Aquasensor Limited | Information & communication | 2023 |
| Aquavision Construction Ltd | Construction | 2007 |
| Aquila DKF Ltd | Financial services | 2021 |
| AR Construction & Project Management Ltd | Construction | 2014 |
| AR Programme & Planning Limited | Professional & scientific | 2025 |
| ARA Delivery Limited | Transport & logistics | 2019 |
| ARB Comms Ltd | Information & communication | 2022 |
| ARB Property Investments Ltd | Real estate | 2021 |
| Arbaco Ltd | Transport & logistics | 2024 |
| Arbern Carpentry & Building Services Ltd | Construction | 2020 |
| ARC Management and Consultancy Services Ltd | Professional & scientific | 2022 |
| ARC Power Solutions Limited | Construction | 2012 |
| Arcade Mania Gaming Limited | Manufacturing | 2021 |
| Arch Peace Studio Ltd | Professional & scientific | 2024 |
| Arcus Technology Ltd. | Information & communication | 2009 |
| Ardrylining Ltd | Construction | 2019 |
| Ardsley 1956 Limited | Extraterritorial | 2013 |
| Ardsley Manor (Barnsley) Management Company Limited | Real estate | 2017 |
| Ardsley Mews Management Company Limited | Households | 1993 |
| Arena Boxing Limited | Arts & recreation | 2022 |
| Arena Stadia Seating Limited | Manufacturing | 2001 |
| Ariande Ltd | Other services | 2020 |
| Aribus Holdings Limited | Real estate | 2025 |
| Aries Motor Engineers Limited | Wholesale & retail | 1990 |
| Aries Trading (UK) Ltd | Construction | 2011 |
| Arissian Dynamics Ltd | Information & communication | 2024 |
| Ariyan Films&Globe TV Limited | Professional & scientific | 2024 |
| ARJ Financial Services Ltd | Financial services | 2015 |
| Arjun Healthcare Limited | Health & social care | 2022 |
| ARK Lighting Ltd | Manufacturing | 2010 |
| ARK Property Investments (Yorkshire) Ltd | Real estate | 2004 |
| Armitage Lifting Services Ltd | Professional & scientific | 2016 |
| Armitage Property Limited | Real estate | 2017 |
| Armitage Residential Limited | Real estate | 2010 |
| Armstrong Cook Holdings Limited | Financial services | 2026 |
| Armstrong Cook Lettings Limited | Real estate | 2021 |
| Armtech Developments Limited | Construction | 2019 |
| Arnarya Ltd | Manufacturing | 2025 |
| Arncliffe Commercial Ltd | Professional & scientific | 2015 |
| Arnold & Co Ltd | Financial services | 2007 |
| Arnold Company Holdings Ltd | Financial services | 2016 |
| Arnold Construction Holdings Limited | Financial services | 2024 |
| Arnold Construction Services Limited | Construction | 2021 |
| Arnold Property Investments Limited | Real estate | 2022 |
| Arod Logistic Ltd | Transport & logistics | 2020 |
| Arotrans Ltd | Transport & logistics | 2019 |
| ARP Human Centric Solutions Ltd | Health & social care | 2016 |
| Arsham Transport Ltd | Transport & logistics | 2026 |
| Art of Palm Limited | Arts & recreation | 2018 |
| Artopia 22 Ltd | Construction | 2023 |
| Arts Therapies Yorkshire Ltd | Administrative & support | 2025 |
| Arturmazeik Ltd | Wholesale & retail | 2025 |
| AS Built Energy Surveys Limited | Professional & scientific | 2016 |
| AS Driving Ltd | Transport & logistics | 2025 |
| As&St Logistic Ltd | Transport & logistics | 2021 |
| As&T Direct Limited | Administrative & support | 2013 |
| Asap Maintenance Ltd | Administrative & support | 2024 |
| ASB Commercials Ltd | Wholesale & retail | 2024 |
| ASC & JKC Group Ltd | Wholesale & retail | 2020 |
| Asco Dampguard Limited | Construction | 2024 |
| Ascoe Transport Ltd | Wholesale & retail | 2019 |
| Ascot Doors (Service) Limited | Manufacturing | 2018 |
| Asensa Ltd | Extraterritorial | 2018 |
| ASG Energy Ltd | Manufacturing | 2004 |
| ASG Power Ltd | Extraterritorial | 2011 |
| ASG Rooftop Assets 1 Limited | Financial services | 2021 |
| ASG Rooftop Assets 2 Limited | Financial services | 2021 |
| Asgf (Holdings) Limited | Financial services | 2022 |
| Asgf Developments Limited | Construction | 2019 |
| ASH & K Ltd | Wholesale & retail | 2026 |
| ASH Building & Joinery Ltd | Construction | 2024 |
| ASH Duff Limited | Construction | 2024 |
| ASH Properties Yorkshire Limited | Real estate | 2024 |
| Ashaps&M Ltd | Construction | 2023 |
| Ashbourne Textiles Ltd | Financial services | 2025 |
| Ashburn Taylor Limited | Administrative & support | 2020 |
| Ashbury Accountants Ltd | Professional & scientific | 2026 |
| Ashcove Mall Ltd | Wholesale & retail | 2023 |
| Ashes Properties Limited | Extraterritorial | 2006 |
| Ashrock Estates Limited | Real estate | 2021 |
| Ashroyd Limited | Construction | 1998 |
| Ashton Aerospace & Defence Limited | Manufacturing | 1996 |
| Ashton Electrical Services Limited | Construction | 2025 |
| Ashton Seals Limited | Wholesale & retail | 1963 |
| Ashtons (Sheffield) Limited | Manufacturing | 1988 |