| 1 - 2 Clear Limited | Construction | 2003 |
| 123 Fire Limited | Construction | 2011 |
| 1978 Investments Ltd | Administrative & support | 2015 |
| 1ST Class Enterprises Limited | Professional & scientific | 2011 |
| 2-7 Finkle Court RTM Company Limited | Households | 2009 |
| 21 Buses Ltd | Transport & logistics | 2024 |
| 21 Tours Ltd | Transport & logistics | 2024 |
| 21 Transport Ltd | Transport & logistics | 2020 |
| 24 Networks & Security Ltd | Construction | 2021 |
| 26CIP Ltd | Transport & logistics | 2023 |
| 3 L C Services Limited | Wholesale & retail | 2010 |
| 451 Audio Ltd | Wholesale & retail | 2024 |
| 5 DG Limited | Professional & scientific | 2012 |
| 5CB Ltd | Transport & logistics | 2016 |
| 96 Phms Ltd | Administrative & support | 2026 |
| A & E Plumbing and Heating Limited | Construction | 2001 |
| A a Aggregates Ltd | Water & waste | 2025 |
| A B Electrical Selby Limited | Construction | 2015 |
| A J Griggs Roofing & Cladding Ltd | Construction | 2025 |
| A Proctor Groundworks Limited | Construction | 2004 |
| A R Metalcraft Ltd | Manufacturing | 2025 |
| A&E Cleaning Limited | Administrative & support | 2014 |
| A-Lign Bead Ltd | Manufacturing | 2018 |
| A-Spec Fencing Ltd | Construction | 2017 |
| A.W. Sweeper Hire Limited | Water & waste | 2016 |
| A2B Safety Management Solutions Ltd | Professional & scientific | 2018 |
| Abbey Ventures Limited | Construction | 2000 |
| Abbie's Property Renovations Limited | Real estate | 2025 |
| ABC Investments Limited | Real estate | 2024 |
| Abela Limited | Health & social care | 2026 |
| Abode Inspections Ltd | Administrative & support | 2020 |
| Abrahamic Care Services Limited | Hospitality | 2023 |
| ABS Mastertech Limited | Wholesale & retail | 2025 |
| Absolute Asset Finance Limited | Wholesale & retail | 2017 |
| AC Electrical Services (Yorkshire) Ltd | Construction | 2019 |
| Academics Elite Ltd | Education | 2024 |
| Acklam Russett Ltd. | Professional & scientific | 2018 |
| Acorn Grange Apartments Freehold Limited | Real estate | 2013 |
| Acorn Surveys Limited | Administrative & support | 2002 |
| Acra Consulting Limited | Professional & scientific | 2019 |
| Action First Physiotherapy Limited | Health & social care | 2016 |
| Acumen Solutions Limited | Water & waste | 2002 |
| Acww Ltd | Professional & scientific | 2025 |
| AD Howard Building Contractors Limited | Construction | 2003 |
| Adam Franks Transport Ltd | Transport & logistics | 2019 |
| Adam Harrison Commercial Limited | Wholesale & retail | 2023 |
| Adapt Automotive Ltd | Manufacturing | 2026 |
| Adaptive Accountancy Ltd | Professional & scientific | 2017 |
| Adina Limited | Administrative & support | 2005 |
| Adis Workshop Limited | Wholesale & retail | 2011 |
| ADK Leisure Limited | Real estate | 2006 |
| ADM Goole Ltd | Hospitality | 2025 |
| Admintia Services Ltd | Administrative & support | 2025 |
| Adrian P Limited | Information & communication | 2024 |
| Advanced Doors & Windows Systems Limited | Wholesale & retail | 2022 |
| Advent CSS Limited | Construction | 2012 |
| Aero SL Ltd | Manufacturing | 2016 |
| Aesthetics Accounting by SAS Limited | Professional & scientific | 2026 |
| Aglow Studio Ltd | Professional & scientific | 2025 |
| Agma Transport Ltd | Transport & logistics | 2017 |
| Airbag Modules Limited | Wholesale & retail | 2025 |
| Airedale Energy Limited | Energy | 2014 |
| Airfield Aggregates Ltd | Administrative & support | 2021 |
| Airmyn Landscapes Ltd | Administrative & support | 2023 |
| AJ Finlay & Sons Ltd. | Transport & logistics | 2011 |
| AJ Griggs Roofing and Cladding Services Ltd | Construction | 2021 |
| AJD Electrical Services Ltd | Construction | 2025 |
| Ajgclothing Ltd | Wholesale & retail | 2025 |
| AJL Preloved Homes Ltd | Real estate | 2025 |
| Alan Dalton (Outwood) Limited | Agriculture & fishing | 1966 |
| Alan Neal Consulting Ltd | Professional & scientific | 2026 |
| Albert Mills Limited | Extraterritorial | 1990 |
| Albie Property Limited | Real estate | 2020 |
| Alder Properties (Howden) Limited | Real estate | 2024 |
| Alec B Storey Limited | Transport & logistics | 2020 |
| Alex Wikira Ltd | Transport & logistics | 2014 |
| Alfred Bekker API Limited | Manufacturing | 2003 |
| ALK Welding Limited | Manufacturing | 2015 |
| Allsports Hospitality Ltd | Wholesale & retail | 2014 |
| Almond Industrial Cleaning Limited | Administrative & support | 2019 |
| Alpha Property Rentals Ltd | Real estate | 2010 |
| Alpha Studio Wrap Ltd | Professional & scientific | 2024 |
| Alpha Wealth Management 369 Ltd | Professional & scientific | 2024 |
| ALS Fire & Security Ltd | Administrative & support | 2025 |
| Altius Business Services Limited | Financial services | 2026 |
| AM Cafe Yorkshire Ltd | Hospitality | 2025 |
| Amanda Foods (UK) Ltd | Wholesale & retail | 2011 |
| Amblestock Limited | Real estate | 2005 |
| Ames UK Property Ltd. | Real estate | 2013 |
| Amha Restaurant Limited | Hospitality | 2019 |
| AN Bulklink Ltd | Professional & scientific | 2025 |
| Anca Limited | Professional & scientific | 2021 |
| AND Marketing Ltd | Professional & scientific | 2020 |
| Andrew Jackson Enterprises Ltd | Professional & scientific | 2025 |
| Andrew Kirby Management Ltd | Construction | 2019 |
| Andrews Automation Limited | Manufacturing | 2003 |
| Andy Bunclark GAS Heating Services Ltd. | Manufacturing | 2020 |
| Angus Beef Company Limited | Agriculture & fishing | 2009 |
| ANM Windows & Doors Ltd | Construction | 2026 |
| Anna's Happy Kitchen Limited | Hospitality | 2018 |