| Anorak Digital Colour Management Limited | Manufacturing | 2000 |
| Anorella Limited | Administrative & support | 2014 |
| Antrio Ltd | Information & communication | 2026 |
| AP Walker Property Limited | Households | 2025 |
| Apegg Ltd | Real estate | 2009 |
| Apex Kitchens BG Ltd | Manufacturing | 2023 |
| Apex Predator Limited | Professional & scientific | 2013 |
| Apex Safety Group Ltd | Construction | 2026 |
| APH Electrical (Yorkshire) Limited | Construction | 2021 |
| Apjm Properties Limited | Real estate | 2010 |
| APM Property Group Limited | Real estate | 2026 |
| Apollo Music School Limited | Education | 2025 |
| Apprentice Days Limited | Education | 2023 |
| Aquapaws Canine Hydrotherapy Ltd | Agriculture & fishing | 2023 |
| Aquastar Swimming School Limited | Education | 2016 |
| Aquila Sporthorses Limited | Agriculture & fishing | 2012 |
| Arabian Horse Limited | Hospitality | 2023 |
| Aras Property Ltd | Real estate | 2019 |
| ARB and Sons Limited | Real estate | 2025 |
| Arcade Warehouse Ltd | Water & waste | 2002 |
| Archery Property Limited | Real estate | 2025 |
| Archiq Limited | Financial services | 2025 |
| Archive on Site Solutions Limited | Construction | 2012 |
| Archive Pro Ltd | Information & communication | 2025 |
| Arctic Tern Expeditions Limited | Other services | 2020 |
| Ardbar Ltd | Administrative & support | 2021 |
| Arete Property Limited | Real estate | 2020 |
| Aristomatics Properties Limited | Real estate | 1965 |
| ARK Ventilation Ltd | Construction | 2022 |
| Arly Trading Ltd | Wholesale & retail | 2015 |
| Armitage Electrical Solutions Limited | Construction | 2017 |
| Arnold On-Site Services Limited | Manufacturing | 2020 |
| AROJAFF2020 Limited | Other services | 2022 |
| Arora Housing Ltd | Real estate | 2024 |
| Arrys Kitchen Pontefract Ltd | Hospitality | 2025 |
| Arshia Ristorante Limited | Hospitality | 2025 |
| Arturo Trans Ltd | Transport & logistics | 2019 |
| Ascend Building Solutions Ltd | Construction | 2025 |
| Asea Properties Limited | Real estate | 2020 |
| Aspirations Doncaster Limited | Education | 2024 |
| Aspirations Together CIC | Education | 2025 |
| Aspire Clinical Education Ltd | Education | 2024 |
| Assayd Ltd | Information & communication | 2026 |
| Asset Intelligence Services Limited | Professional & scientific | 2010 |
| Assign One Limited | Extraterritorial | 2013 |
| Assist Financial Consultants Ltd | Professional & scientific | 2019 |
| Assurant Ltd | Information & communication | 2018 |
| Assure Property Solutions Ltd | Construction | 2023 |
| Assured Sale and Progression Limited | Professional & scientific | 2014 |
| Astorbush Limited | Real estate | 1984 |
| Astral Communications and Electronics Limited | Information & communication | 1987 |
| ASW Accounting Ltd | Professional & scientific | 2022 |
| Atkinson & Storey Limited | Construction | 2012 |
| Atkinson Jointing Ltd | Construction | 2014 |
| Atlas Global Print Solutions Ltd | Wholesale & retail | 2025 |
| Atlas Vintage Ltd | Wholesale & retail | 2020 |
| Atom Electrical Ltd | Construction | 2020 |
| Atom Herders Limited | Arts & recreation | 2015 |
| ATS GAS Ltd | Construction | 2025 |
| Atvcrew Ltd | Information & communication | 2019 |
| AUDIT4 Compliance Ltd | Professional & scientific | 2011 |
| Aumshiv Limited | Wholesale & retail | 2023 |
| Austhorpe Properties Ltd | Real estate | 2025 |
| Austhorpe Signs Ltd | Manufacturing | 2007 |
| Autec Autocentre Ltd | Administrative & support | 2016 |
| Auto Enrolment Advice Limited | Administrative & support | 2013 |
| Auto Test Equipment Ltd | Manufacturing | 2023 |
| Autocure Mechanics Ltd | Wholesale & retail | 2025 |
| Automate Works Limited | Information & communication | 2025 |
| Autosave (Pontefract) Limited | Wholesale & retail | 1998 |
| Avadata Limited | Information & communication | 2026 |
| Aval Accounting Limited | Professional & scientific | 2025 |
| Avamotive Ltd | Wholesale & retail | 2025 |
| Avora Consulting Ltd | Construction | 2026 |
| AVS Origin Limited | Transport & logistics | 2016 |
| AW Detailing Limited | Transport & logistics | 2025 |
| AW Sykes Motorcycles Limited | Wholesale & retail | 2008 |
| AWK Global Group Limited | Other services | 2023 |
| AWP Car Sales Ltd | Wholesale & retail | 2013 |
| Axam Property Ltd | Real estate | 2025 |
| Axholme Holdings Limited | Households | 2016 |
| Axious Solutions Ltd | Construction | 2026 |
| Aydecki Ltd | Arts & recreation | 2026 |
| Aydin International Academy Ltd | Education | 2025 |
| Azefam Limited | Public administration | 2016 |
| Azzure Estates Limited | Construction | 2016 |
| Azzure Holdings Limited | Construction | 2016 |
| Azzure Properties Limited | Construction | 2016 |
| B Jackson Building Services Ltd | Construction | 2020 |
| B Made for YOU Ltd | Hospitality | 2017 |
| B3 Sports Ltd | Education | 2023 |
| Backstage Academy Community Interest Company | Education | 2009 |
| Badger and FOX Yorkshire Ltd | Wholesale & retail | 2026 |
| Badsworth Nursery Limited | Health & social care | 2016 |
| Balance Health & Wellness Ltd | Health & social care | 2022 |
| Bald Statement Events Ltd | Arts & recreation | 2023 |
| Balti Bazaar Wakefield Ltd | Hospitality | 2026 |
| Bamboo Pontefract Ltd | Hospitality | 2025 |
| Bankhouse Mews Property Management Limited | Households | 2022 |
| Banks Builders Limited | Construction | 2004 |