| 1965 Ptsd Awareness LP | | 2022 |
| 220 Yards Limited | Information & communication | 2011 |
| 23 Illustrations Ltd | Information & communication | 2025 |
| 2ND ROW Productions Ltd | Professional & scientific | 2024 |
| 4KSECURITY Ltd | Administrative & support | 2025 |
| 51 Degrees North Studios Limited | Professional & scientific | 2014 |
| 90 Degrees Group Ltd | Administrative & support | 2024 |
| A Beaumont Plastering & Dry-Lining Ltd | Construction | 2020 |
| A K Mega Deals Limited | Wholesale & retail | 2023 |
| A N Q Music Ltd | Information & communication | 2023 |
| A.F. Wilkinson Limited | Extraterritorial | 1999 |
| A.H Driving Services Limited | Transport & logistics | 2010 |
| AB Industrial Services Limited | Transport & logistics | 1999 |
| About the Build Ltd | Construction | 2016 |
| AC @ Home Limited | Energy | 2021 |
| AC Performance Ltd | Wholesale & retail | 2026 |
| Acorn Express Limited | Wholesale & retail | 2005 |
| Acorns-In-Eldwick Limited | Education | 2009 |
| Acsals Limited | Financial services | 2013 |
| Action for Sport | Health & social care | 2019 |
| ACW Garden Service (Holdings) Limited | Professional & scientific | 2009 |
| Adept PS Ltd | Manufacturing | 2025 |
| Adhesive Solutions Limited | Wholesale & retail | 2004 |
| Admin Cloud Limited | Administrative & support | 2011 |
| Advancery Limited | Information & communication | 2014 |
| Aero Cipher Solutions Limited | Professional & scientific | 2024 |
| African Moto Adventures LLP | | 2022 |
| Africanos Drinks Ltd | Hospitality | 2017 |
| Agronomy Research Group Limited | Agriculture & fishing | 2017 |
| AH Portfolio Group Limited | Real estate | 2024 |
| Ahmed & Ahmed Management Consultants Limited | Information & communication | 2011 |
| AI Technologies (AIT) Limited | Information & communication | 2026 |
| Airaid Commissioning Ltd | Professional & scientific | 2018 |
| Aire & Wharfe Electrical Services Limited | Construction | 2024 |
| Aire Consulting Ltd | Information & communication | 2025 |
| Aire Padel Limited | Arts & recreation | 2025 |
| Aire Property Investments Ltd | Real estate | 2016 |
| Aire Valley Access & Visuals Ltd | Construction | 2026 |
| Aire Valley Computer Solutions Limited | Information & communication | 2009 |
| Aire Valley Consultancy Limited | Professional & scientific | 2024 |
| Aire Valley Developments (UK) Ltd | Construction | 2005 |
| Aire Valley Management Company Limited | Households | 2006 |
| Aire Valley Park Ltd | Professional & scientific | 2013 |
| Aire View Homes Ltd | Construction | 2020 |
| Aire Wharfe Design and Build Ltd | Construction | 2022 |
| Airedale Accounting Limited | Professional & scientific | 2017 |
| Airedale Agricultural Society | Administrative & support | 2008 |
| Airedale Architects Ltd | Professional & scientific | 2012 |
| Aireworth Motor Group Ltd | Wholesale & retail | 2024 |
| Airnx Ltd | Information & communication | 2018 |
| AJ Gastech Ltd | Construction | 2016 |
| Aj's Roller Disco Ltd | Arts & recreation | 2016 |
| Ajives Limited | Construction | 2013 |
| AK Performance BFD Limited | Wholesale & retail | 2025 |
| Akmm Adept Engineering Limited | Professional & scientific | 2014 |
| Alan Church Ltd | Manufacturing | 2016 |
| Aldo's G&T Limited | Hospitality | 2017 |
| Aldo's Italian Limited | Hospitality | 2017 |
| Alfie's Table Tennis Academy Ltd | Education | 2025 |
| Allan Bridge Engineering Limited | Professional & scientific | 2014 |
| Allworx Cleaning Services Limited | Administrative & support | 2024 |
| Allworx Group Ltd | Construction | 2020 |
| Almpharma Ltd. | Wholesale & retail | 2015 |
| Alphazita Limited | Extraterritorial | 2018 |
| Altar Farm Investments Limited | Administrative & support | 2011 |
| Altar Wood Farm Ltd | Agriculture & fishing | 2023 |
| Aluminium Profile Services Limited | Extraterritorial | 2015 |
| Amaya Consulting Ltd | Administrative & support | 2023 |
| Amber Waters Limited | Administrative & support | 2003 |
| Ambi-Air UK Ltd | Wholesale & retail | 2026 |
| Amethyst Clinic Ltd | Health & social care | 2024 |
| Ammd Properties Ltd | Real estate | 2022 |
| Ampin Ltd | Real estate | 2025 |
| AN Hearing Limited | Other services | 2025 |
| Andrew Batch Consulting Ltd | Information & communication | 2018 |
| Andrew Jackson Roofing Ltd | Construction | 2025 |
| Andriaszkiewicz Holdings Ltd | Real estate | 2025 |
| Angela Millar Wealth Management Ltd | Financial services | 2018 |
| Anglo European Machinery Limited | Other services | 2019 |
| Aniso Engineering Ltd | Professional & scientific | 2026 |
| Anness Electrical Ltd | Construction | 2022 |
| Annex Solutions Limited | Administrative & support | 2010 |
| Anywhere Physio Ltd | Information & communication | 2023 |
| AOB Trans Ltd | Transport & logistics | 2023 |
| APS3D Ltd | Administrative & support | 2026 |
| Aqua Operations Holding Limited | Financial services | 2022 |
| AR & APS Developments Ltd | Real estate | 2026 |
| Aronha Limited | Wholesale & retail | 2003 |
| Artfitz Ltd | Manufacturing | 2009 |
| Arthdorm Limited | Real estate | 2018 |
| Arthington Estates Limited | Real estate | 2018 |
| ARX Consultants Limited | Professional & scientific | 2018 |
| AS Engineering Partners Ltd | Professional & scientific | 2025 |
| Asad Gohar Ltd | Wholesale & retail | 2025 |
| ASN Doors Limited | Extraterritorial | 2012 |
| ASP8 Ltd | Professional & scientific | 2024 |
| Aspire 2B Care Limited | Administrative & support | 2017 |
| Aspirelane Wealth Planning Ltd | Professional & scientific | 2019 |
| Assisted Living Group Limited | Administrative & support | 2026 |
| Atlas & Co Mortgage Services Limited | Financial services | 2025 |