| A&T Office Admin Solutions Ltd | Extraterritorial | 2020 |
| A-Class Driveway Ltd | Other services | 2024 |
| A-Sheore Limited | Professional & scientific | 2022 |
| A-Z Building Maintenance Ltd | Construction | 2017 |
| A-Z Investing Limited | Real estate | 2020 |
| A-Z Quality Build Ltd | Construction | 2016 |
| A. & M. (UK) Limited | Professional & scientific | 1999 |
| A. Andrews & Sons (Marbles & Tiles) Limited | Construction | 1936 |
| A. Bianchi Financial Solutions Limited | Financial services | 2006 |
| A. L. Birkenshaw Limited | Other services | 2005 |
| A. Mullen Construction Limited | Construction | 2018 |
| A. Pickles Engineering Limited | Manufacturing | 2002 |
| A. R. Mclean Building & Project Management Services Limited | Professional & scientific | 2015 |
| A. S Cars Leeds Limited | Wholesale & retail | 2017 |
| A. Stevens Crowd Science Ltd | Administrative & support | 2020 |
| A.A.K Electrical Installations Ltd | Construction | 2010 |
| A.A.K Holdings Limited | Financial services | 2017 |
| A.Akila Limited | Transport & logistics | 2017 |
| A.B Assets Rentals Ltd | Real estate | 2025 |
| A.B Electrical Leeds Ltd | Construction | 2022 |
| A.B.I. Garage Doors Limited | Wholesale & retail | 1989 |
| A.B.K Construction & Design Ltd | Construction | 2026 |
| A.Bridgeman Ltd | Health & social care | 2024 |
| A.C. Bali Logistics Ltd | Transport & logistics | 2025 |
| A.C.M. (Yorkshire) Limited | Energy | 2013 |
| A.C.P Decorating Ltd | Construction | 2023 |
| A.D.P. Contract Management Services Limited | | 1981 |
| A.D.T Commercial Property Holdings Limited | Real estate | 2023 |
| A.D.T Flexibles (UK) Ltd | Wholesale & retail | 1982 |
| A.E. Costin Haulage Limited | Information & communication | 1975 |
| A.F. Budge (Contractors) Limited | Wholesale & retail | 1962 |
| A.Foster Consulting Ltd | Professional & scientific | 2026 |
| A.Grant Consultancy Limited | Professional & scientific | 2016 |
| A.H.F. Projects Limited | Construction | 2006 |
| A.Harrison(Bedding) Limited | Extraterritorial | 2009 |
| A.I.P Spray Painting Limited | Construction | 2026 |
| A.J. Everitt Limited | Construction | 2005 |
| A.J. Quyn Ltd | Health & social care | 2019 |
| A.J. Roberts Construction Limited | Construction | 1964 |
| A.Juniper Change Professional Limited | Administrative & support | 2016 |
| A.K Plastering & Rendering Ltd | Construction | 2018 |
| A.K.Khan Limited | Wholesale & retail | 2025 |
| A.Kawara Limited | Other services | 2018 |
| A.L.E. Digital & Media Production Limited | Information & communication | 2021 |
| A.L.G. NO. 1 Limited | Transport & logistics | 1973 |
| A.M 777 Retail Ltd | Wholesale & retail | 2021 |
| A.M. Bracchi Limited | Professional & scientific | 2004 |
| A.M.I.P Limited | Extraterritorial | 2006 |
| A.M.K. Maintenance Leeds Limited | Construction | 1985 |
| A.N&D Homes Limited | Real estate | 2025 |
| A.N.2000 Limited | Water & waste | 1988 |
| A.N.R Installations Ltd | Construction | 2018 |
| A.Nazir Transport Ltd | Transport & logistics | 2025 |
| A.R. Vehicles Ltd | Wholesale & retail | 2020 |
| A.R.Facer Limited | Manufacturing | 1938 |
| A.R.T. Plant Limited | Manufacturing | 1968 |
| A.S Drywall Ltd | Construction | 2023 |
| A.S. Broadley (Developments) Limited | Wholesale & retail | 1990 |
| A.S.K Landscaping Ltd | Administrative & support | 2021 |
| A.S.M. Fabrications Limited | Manufacturing | 2004 |
| A.S.R Transport Ltd | Transport & logistics | 2024 |
| A.T Renovations Ltd | Real estate | 2025 |
| A.T. Electrical Contractors Ltd | Construction | 2018 |
| A.T.P. Advertising & Marketing Limited | Professional & scientific | 1992 |
| A.Taylor & Son(Leeds),Limited | Real estate | 1935 |
| A.W. & E. Ramsden Limited | Wholesale & retail | 1973 |
| A.W.Sinclair & Sons Limited | Wholesale & retail | 1931 |
| A.Webber & Son,Limited | Real estate | 1937 |
| A/Bob RL Ltd | Health & social care | 2015 |
| A1 ALL Cars Limited | Wholesale & retail | 2006 |
| A1 Approved Holdings Ltd | Financial services | 2025 |
| A1 Approved Limited | Administrative & support | 2008 |
| A1 Call Centre Ltd | Other services | 2014 |
| A1 Capital Properties Ltd | Real estate | 2026 |
| A1 Car Sales (Leeds) Limited | Wholesale & retail | 2012 |
| A1 Caravan Ltd | Wholesale & retail | 2019 |
| A1 Comms Limited | Wholesale & retail | 2002 |
| A1 Displays Ltd | Manufacturing | 2015 |
| A1 Events Management Limited | Arts & recreation | 2003 |
| A1 M1 Aggregates Ltd | Water & waste | 2025 |
| A1 Press Ltd | Manufacturing | 2005 |
| A1 Professional Cleaning Limited | Administrative & support | 2010 |
| A1 Property Services Leeds Ltd | Administrative & support | 2022 |
| A1 Sewing Machines Ltd | Manufacturing | 2013 |
| A1 Traffic Management Limited | Construction | 2019 |
| A1 Travel Ltd | Transport & logistics | 2024 |
| A11 Building Maintenance Ltd | Construction | 2012 |
| A1CAKEOLOGY Limited | Transport & logistics | 2025 |
| A1ED Limited | Administrative & support | 2024 |
| A2 Elite Limited | Wholesale & retail | 2025 |
| A2 Health Ltd | Wholesale & retail | 2019 |
| A2 Healthcare Ltd | Health & social care | 2025 |
| A2 Plumbing & Heating Solutions Ltd | Construction | 2025 |
| A2A Capital LLP | | 2025 |
| A2B Drylining Limited | Construction | 2020 |
| A2B House Clearance & Waste Removals Ltd | Water & waste | 2025 |
| A2B Plant Hire & Services Ltd | Administrative & support | 2024 |
| A2B Project Management Ltd | Professional & scientific | 2023 |
| A2Z Couriers (Yorkshire) Ltd | Transport & logistics | 2025 |
| A2Z Home Interiors Ltd | Wholesale & retail | 2025 |