| A&C Plumbing and Heating Ltd | Wholesale & retail | 2006 |
| A&J Rotisseri Ltd | Hospitality | 2024 |
| A&M Peruvian Company Ltd | Administrative & support | 2019 |
| A&M Properties 000 Limited | Real estate | 2026 |
| A&M Properties U.K. Limited | Real estate | 2017 |
| A&R Cleaning & Valeting Brookhill Ltd | Administrative & support | 2020 |
| A&R Events Ltd | Other services | 2026 |
| A&W Engineering Limited | Professional & scientific | 2025 |
| A-Z Trading Card Shop Ltd | Wholesale & retail | 2025 |
| A. Archer Electrical Limited | Construction | 1989 |
| A. Wass Funeral Directors Limited | Other services | 2009 |
| A.C.E. Guidance Services Ltd | Education | 2023 |
| A.D.F. Property Solutions Ltd | Real estate | 2024 |
| A.E. Bowring & Sons Limited | Agriculture & fishing | 1967 |
| A.H. Construction & Services Ltd | Construction | 2024 |
| A.H.S Cleaning Services Limited | Administrative & support | 2025 |
| A.J. Bowring Cattle Limited | Agriculture & fishing | 2015 |
| A.Johnson Property Ltd | Real estate | 2019 |
| A.M Autogroup Ltd | Administrative & support | 2025 |
| A.M. Packaging (Mansfield) Limited | Wholesale & retail | 2003 |
| A.M.A. Supplies Limited | Wholesale & retail | 2002 |
| A.P Electrical Services Ltd | Construction | 2016 |
| A.U. Driveway's Experts Ltd | Construction | 2024 |
| A.Ward Winning Travel Limited | Administrative & support | 2025 |
| A1 Garden Buildings Limited | Manufacturing | 2001 |
| A1 Home Invest Ltd | Real estate | 2020 |
| A2A Water Solutions Ltd | Construction | 2022 |
| A3 Fabrications Limited | Manufacturing | 2025 |
| AA Asset and Property Holding Ltd | Real estate | 2026 |
| AA Clean Wise Ltd | Wholesale & retail | 2023 |
| AAA Cabs (Notts) Ltd | Transport & logistics | 2020 |
| AAM Services (UK) Limited | Financial services | 2001 |
| AAR Inns Limited | Hospitality | 2009 |
| Aaron Sidhu Limited | Wholesale & retail | 2022 |
| AB Acquisitions Ltd | Hospitality | 2024 |
| AB Aero Consultancy Ltd | Professional & scientific | 2026 |
| AB Building Services Nottingham Ltd | Construction | 2026 |
| AB Furnishing Holdings Ltd | Financial services | 2017 |
| AB Trade Holding Co Ltd | Professional & scientific | 2026 |
| AB Waste Disposal Limited | Water & waste | 1997 |
| ABA Commercial Maintenance Limited | Administrative & support | 2004 |
| ABA Holdings (Nottingham) Limited | Financial services | 2019 |
| ABC Garages Ltd | Wholesale & retail | 2011 |
| ABC Polymer Industries Limited | Wholesale & retail | 2017 |
| ABC Start Ltd | Health & social care | 2026 |
| ABC Vehicle Collection Ltd | Wholesale & retail | 2017 |
| Abel Food Ltd | Hospitality | 2021 |
| Abel Services (Mansfield) Ltd | Construction | 2008 |
| Abel Services Ltd | Construction | 2022 |
| Abhay Brar Developments Limited | Real estate | 2011 |
| Able Health Limited | Professional & scientific | 2024 |
| ABLE2MAINTAIN Property Services Limited | Real estate | 2016 |
| ABLOSALO03 Ltd | Hospitality | 2025 |
| ABM Pest Control Ltd | Administrative & support | 2025 |
| Absolute Conveyancing Limited | Professional & scientific | 2017 |
| Absolute Healthcare Swan House Limited | Health & social care | 2021 |
| Absolute Wellness Centre Limited | Health & social care | 2006 |
| Abstract Trading Services Ltd | Professional & scientific | 2024 |
| AC Driveway Specialist Ltd | Construction | 2025 |
| AC Events Group Limited | Other services | 2018 |
| Acacia 25 Limited | Hospitality | 2013 |
| Academic Help Ltd | Education | 2022 |
| Academy of Beauty Training Ltd | Education | 2007 |
| Academy of Dance RAH Ltd | Arts & recreation | 2023 |
| Accelerated Driving Courses Ltd | Education | 2025 |
| Account Smart Ltd | Professional & scientific | 2017 |
| Accountancy Solutions (Midlands) UK Ltd. | Professional & scientific | 2007 |
| Accountancy Solutions (Nottingham) Ltd | Professional & scientific | 2007 |
| Accountax Help Centre Limited | Extraterritorial | 2011 |
| Accsys Spangle Limited | Professional & scientific | 1998 |
| Acculine Markings Limited | Construction | 2013 |
| Ace Land Development Limited | Real estate | 2004 |
| Acecine Studio Ltd | Professional & scientific | 2024 |
| Acel Systems Ltd | Wholesale & retail | 2017 |
| ACF Ventures Ltd | Transport & logistics | 2018 |
| ACG Lifts Limited | Construction | 2025 |
| Achievement Surveying Consultant Limited | Professional & scientific | 2023 |
| Acid Rain Ltd | Wholesale & retail | 2025 |
| ACL COM Property Limited | Real estate | 2026 |
| Acorn Handling Limited | Manufacturing | 1991 |
| Acorn Sales & Leasing Ltd | Wholesale & retail | 2003 |
| Acorn Signs & Engraving Limited | Manufacturing | 1999 |
| Acorns Childcare Mansfield Limited | Health & social care | 2025 |
| ACS Media Services Limited | Information & communication | 2016 |
| Action Aerials Limited | Other services | 2011 |
| Action Patch Planing Ltd | Construction | 2014 |
| Active Garden Maintenance Ltd | Administrative & support | 2026 |
| Active Systems Group Limited | Wholesale & retail | 1999 |
| Active Winter Services Ltd | Administrative & support | 2025 |
| Activevoice Store Ltd | Information & communication | 2024 |
| Acumen ROI Limited | Wholesale & retail | 2012 |
| AD Electrical Services Mansfield Ltd | Construction | 2021 |
| AD Leisure Group Ltd | Other services | 2022 |
| Adailah Designer Studio Ltd | Information & communication | 2024 |
| Adam Ball Property Limited | Real estate | 2023 |
| Adapt Building & Repair Services Ltd | Construction | 2020 |
| Adco Properties Limited | Construction | 1985 |
| ADD Hire & Scaffolding Ltd | Construction | 2017 |
| Addison Contractors Limited | Construction | 2024 |
| Address Author Ltd | Construction | 2019 |