| A J Whitham Energy Services Limited | Professional & scientific | 2019 |
| A K Bespoke Ltd | Professional & scientific | 2023 |
| A Lawson Building Maintenance Limited | Construction | 2017 |
| A Lingard Ltd | Arts & recreation | 2017 |
| A Little BIT Endless Limited | Professional & scientific | 2015 |
| A M & L J Stewart Property Services Ltd | Real estate | 2021 |
| A M Multi-Utilities Limited | Construction | 2006 |
| A M P Construction Limited | Construction | 1995 |
| A Morgan Telecoms Limited | Information & communication | 2018 |
| A Munton Technical Services Limited | Other services | 2016 |
| A N K Developer Ltd | Construction | 2017 |
| A New Dawn Ltd | Health & social care | 2025 |
| A O Site Services Ltd | Construction | 2018 |
| A Parry Engineering Ltd | Manufacturing | 2015 |
| A R F Rental Properties Ltd | Real estate | 2024 |
| A Shade Greener (Boilers) LLP | | 2012 |
| A Shade Greener (F16) LLP | | 2014 |
| A Shade Greener (F17) LLP | | 2014 |
| A Shade Greener (F4) LLP | | 2011 |
| A Shade Greener (F5) LLP | | 2011 |
| A Shade Greener (F6) LLP | | 2011 |
| A Shade Greener (F7) LLP | | 2011 |
| A Shade Greener Deal Ltd | Extraterritorial | 2011 |
| A Shade Greener Debt (4) LLP | | 2015 |
| A Shade Greener Distribution Ltd | Extraterritorial | 2011 |
| A Shade Greener Energy Ltd | Extraterritorial | 2011 |
| A Shade Greener Finance F1 Limited | Financial services | 2019 |
| A Shade Greener Finance F3 Limited | Financial services | 2024 |
| A Shade Greener Finance Limited | Financial services | 2017 |
| A Shaw Construction Ltd | Manufacturing | 2021 |
| A Star Aquatics Limited | Wholesale & retail | 2024 |
| A State of Mind Studio Limited | Other services | 2024 |
| A Thawley GAS Services Limited | Energy | 2015 |
| A Thompson Installations Ltd | Construction | 2007 |
| A Turner Transport Ltd | Transport & logistics | 2019 |
| A W & Sons Electrical Ltd | Construction | 2018 |
| A W Commercial Glazing Ltd | Construction | 2007 |
| A Westbrook Ltd | Other services | 2017 |
| A&C Delivery Solution Ltd | Transport & logistics | 2020 |
| A&D Distribution Services Limited | Transport & logistics | 2019 |
| A&L Carr Properties Limited | Real estate | 2018 |
| A&M Utilities Ltd | Water & waste | 2026 |
| A&N Family Express Ltd | Wholesale & retail | 2017 |
| A&T Auto Garage Ltd | Wholesale & retail | 2026 |
| A&V Convenience Store Ltd | Wholesale & retail | 2019 |
| A'S Pizzas & Burgers Ltd | Hospitality | 2025 |
| A-S-H Renovations Ltd | Real estate | 2025 |
| A-Z Home Improvements Ltd | Construction | 2019 |
| A. & M. Hadfield (Funeral Directors) Limited | Other services | 1981 |
| A. Ardron Limited | Administrative & support | 2003 |
| A. C. Fabrications Limited | Manufacturing | 2000 |
| A. J. Harrison (Accountants) Limited | Professional & scientific | 2009 |
| A. Littlewood Plastering Limited | Construction | 2021 |
| A. P. Hollingworth Limited | Transport & logistics | 1961 |
| A. Tucker & SON Farming Ltd | Agriculture & fishing | 2013 |
| A. Tucker & SON Investments Ltd | Real estate | 2024 |
| A. Tucker & SON Ltd | Administrative & support | 2005 |
| A. Tucker & SON Properties Ltd | Real estate | 2023 |
| A. White Transport Ltd | Transport & logistics | 2020 |
| A.B.I. Electronics (Holdings) Limited | Financial services | 2013 |
| A.B.I. Electronics Limited | Manufacturing | 1984 |
| A.D.E Installations Ltd | Construction | 2020 |
| A.Flo Transport Ltd | Transport & logistics | 2025 |
| A.G. Nicholson Limited | Agriculture & fishing | 2003 |
| A.J.S. Services (Yorkshire) Limited | Construction | 2013 |
| A.L.C. Fencing Limited | Construction | 2024 |
| A.L.Fenton Roofing Limited | Construction | 2014 |
| A.M.Roofing Limited | Construction | 2015 |
| A.N.S Construction Limited | Construction | 2011 |
| A.N.S Luxury Developments Limited | Construction | 2021 |
| A.N.S. Homes Limited | Construction | 2017 |
| A.R. Duffy Limited | Hospitality | 2010 |
| A.T.C. Manufacturing Limited | Real estate | 1921 |
| A.T.C. Property Limited | Professional & scientific | 1968 |
| A.Tucker & SON Haulage Ltd | Transport & logistics | 2013 |
| A2B Class Logistics Ltd | Transport & logistics | 2025 |
| A2B Homes Limited | Real estate | 2024 |
| A2B Trading Solutions Limited | Wholesale & retail | 2020 |
| AA Construction Support Solutions Limited | Professional & scientific | 2018 |
| AA Ground Ltd | Other services | 2023 |
| AA PVT Clients Ltd | Other services | 2023 |
| AA2 Properties Limited | Real estate | 2016 |
| AA2L Limited | Professional & scientific | 2003 |
| AAA Metals Ltd | Wholesale & retail | 2025 |
| Aardvark Joinery Ltd | Manufacturing | 2022 |
| Aaruran EIF Ltd | Transport & logistics | 2020 |
| Aarus Properties Ltd | Real estate | 2026 |
| Aaryen Store Ltd | Wholesale & retail | 2017 |
| Aatarah Designs Ltd | Wholesale & retail | 2025 |
| AB Access Scaffolding Services Ltd | Construction | 2026 |
| AB Automotive Ltd | Wholesale & retail | 2022 |
| AB Glass Engineering Services Ltd | Professional & scientific | 2025 |
| AB Global Wind Ltd | Energy | 2018 |
| AB Spice Darton Ltd | Hospitality | 2025 |
| Abal Holdings Ltd | Financial services | 2026 |
| Abbas Healthcare Limited | Health & social care | 2026 |
| Abbey Care and Nursing @Home Limited | Health & social care | 2007 |
| Abbey Residential & Investments Ltd | Real estate | 2025 |
| Abbey Scaffolding Services Ltd | Construction | 2023 |
| Abbey-Tek Doors Ltd | Construction | 2022 |