| & Berry Limited | Administrative & support | 2024 |
| 10STEPS Ltd | Information & communication | 2022 |
| 1ST AID Yorkshire Limited | Wholesale & retail | 2008 |
| 2032 Programme Solutions Limited | Professional & scientific | 2025 |
| 22 North Road Limited | Hospitality | 2023 |
| 3G Resources Limited | Professional & scientific | 2014 |
| 3SF Limited | Professional & scientific | 2020 |
| 3VESUVIOS Limited | Hospitality | 2024 |
| 47 Accounting Limited | Professional & scientific | 2024 |
| 4X4 in Schools Limited | Professional & scientific | 2004 |
| 5 Star Carpets Limited | Wholesale & retail | 2015 |
| A & F Solutions Ltd | Public administration | 2022 |
| A 2 Z Airport Transfers Ltd | Transport & logistics | 2023 |
| A D Control Solutions Limited | Information & communication | 2007 |
| A Hair and Beauty Ltd | Other services | 2023 |
| A House of Others Limited | Hospitality | 2025 |
| A J Raine Ltd | Other services | 2019 |
| A M Consultancy Services (UK) Limited | Professional & scientific | 2012 |
| A N & G Property Limited | Construction | 2013 |
| A O J Services Limited | Other services | 2026 |
| A One Tools Ltd | Wholesale & retail | 2021 |
| A-Camps Ltd | Health & social care | 2018 |
| A-Game Creative Ltd. | Other services | 2015 |
| A-One Tools & Fixings (Brighouse) Limited | Wholesale & retail | 1981 |
| A. C. Joinery & Building Ltd. | Construction | 2019 |
| A. M. Insolvency Limited | Financial services | 2015 |
| A.C.C. (Flooring) Limited | Construction | 1986 |
| Aaron Wheeler Gunsmith Limited | Manufacturing | 2012 |
| AB Build Developments Ltd | Construction | 2020 |
| AB Build Limited | Construction | 2014 |
| Abzorb Group Ltd | Information & communication | 2017 |
| Abzorb Ltd | Information & communication | 2001 |
| Abzorb Systems Ltd | Information & communication | 2000 |
| Abzorb Technology Ltd | Information & communication | 2025 |
| Abzorb U Holdings Ltd | Financial services | 2019 |
| Abzorb U Ltd | Information & communication | 2014 |
| Accounts Online UK Limited | Professional & scientific | 2009 |
| Aceblade Limited | Mining & quarrying | 1985 |
| Aces Group Holdings Limited | Education | 2025 |
| Achieve Success Limited | Professional & scientific | 2009 |
| ACM Trading Ltd. | Manufacturing | 2009 |
| Aconek Ltd | Information & communication | 2016 |
| Active Community Education in Sport Ltd | Education | 2015 |
| Active Compliance Services Limited | Professional & scientific | 1999 |
| Acumen Management International Limited | Professional & scientific | 2010 |
| Acute Medical Education Ltd | Education | 2022 |
| Adam Mickiewicz Polish Saturday School in Huddersfield | Education | 2017 |
| Adluco Limited | Financial services | 2021 |
| ADM Tekke Ltd | Hospitality | 2026 |
| ADS Real Estate Limited | Real estate | 2010 |
| ADT Golf Studios Ltd | Arts & recreation | 2025 |
| Adyaan Brother Ltd | Wholesale & retail | 2018 |
| AF Zoom Limited | Hospitality | 2025 |
| Agaram Ltd | Education | 2019 |
| Aharrisonpubs Limited | Hospitality | 2024 |
| AHX Limited | Households | 2005 |
| AIM Boxing & Fitness Ltd | Arts & recreation | 2025 |
| Aireborough GAS Limited | Construction | 2014 |
| AJM Fixings & Power Tools Limited | Wholesale & retail | 1993 |
| AJW Property Installations Ltd | Construction | 2022 |
| AK Golf Limited | Education | 2015 |
| AL Associated Consultants Ltd | Administrative & support | 2021 |
| Albion Mill LLP | | 2010 |
| Alco Hi-Tek Limited | Manufacturing | 2020 |
| Alco Valves Group Limited | Manufacturing | 1998 |
| Alco Valves Holdings Limited | Other services | 2020 |
| Alco Valves Limited | Manufacturing | 2020 |
| ALL Things Transport Ltd | Professional & scientific | 2018 |
| Allegiancetek Ltd | Information & communication | 2022 |
| Alliance Valves Group U.K. Ltd | Manufacturing | 2018 |
| Alto Homes (Holdings) Ltd | Real estate | 2020 |
| Ambient Tribe Ltd. | Professional & scientific | 2003 |
| Andrew Brown Travel Consulting Limited | Professional & scientific | 2019 |
| Andy Thornton Worldwide Interiors Limited | Construction | 2014 |
| AR Consultancy & Co (Accountants) Ltd | Professional & scientific | 2021 |
| Arbor Studio Limited | Professional & scientific | 2020 |
| Arcform Fabrications Limited | Manufacturing | 2008 |
| Architectural Street Furnishings Limited | Administrative & support | 1993 |
| ARGLEN25 Limited | Professional & scientific | 2024 |
| Aristocracy Ltd | Financial services | 2026 |
| ARK and Anchor C.I.C. | Health & social care | 2025 |
| Armaan Travel Limited | Transport & logistics | 2018 |
| Artisan Property Management Limited | Households | 2000 |
| ARW Joinery Contractors Limited | Construction | 2011 |
| Asbestiform Ltd | Professional & scientific | 2019 |
| Ascent Installation Ltd | Construction | 2017 |
| Asco Consultancy Limited | Professional & scientific | 2018 |
| Ashn 2 Limited | Financial services | 2014 |
| ASP Groundworks Ltd | Construction | 2006 |
| Aspire Property Lettings Limited | Real estate | 2017 |
| Assist Resourcing UK Ltd | Administrative & support | 2015 |
| Atlas Distributions Trade Ltd | Wholesale & retail | 2023 |
| Atlas Mill Car Body Shop Limited | Wholesale & retail | 2021 |
| Atlas Mill Properties Limited | Real estate | 2002 |
| Atwil Holdings Limited | Financial services | 2024 |
| Aura One & Luxe Limited | Other services | 2026 |
| Autoblend 2013 Limited | Wholesale & retail | 2013 |
| Avocado Envy Limited | Hospitality | 2022 |
| Avocet DYE and Chemical Co. Limited | Manufacturing | 1977 |
| Avocet Hardware (UK) Ltd | Wholesale & retail | 2008 |