| 115 Fitness Limited | Arts & recreation | 2025 |
| 1984 Holdings Limited | Transport & logistics | 2016 |
| 2ME2U Property Ltd | Real estate | 2025 |
| 3 Shires Builders Ltd | Construction | 2022 |
| 35 Westholme Ltd | Real estate | 2024 |
| 360 Commercial Cleaning Services Limited | Administrative & support | 2014 |
| 360 Tree Care Limited | Administrative & support | 2026 |
| 4BIKERS Limited | Extraterritorial | 2020 |
| 4SN Ltd | Wholesale & retail | 2024 |
| 5 Indians Ltd | Hospitality | 2023 |
| 5 Star School Photography Ltd | Professional & scientific | 2026 |
| 7 to 15 Chirnside Limited | Extraterritorial | 2001 |
| A & D Drylining & Joinery Limited | Construction | 2009 |
| A a Enterprise Property Ltd | Real estate | 2022 |
| A Coombe Plumbing Contractors Ltd | Construction | 2020 |
| A I Mason Street Furniture Installations Limited | Construction | 1999 |
| A P Convenience Store Limited | Wholesale & retail | 2023 |
| A&D Drylining and Plastering Limited | Real estate | 2019 |
| A&S Education and Immigration Solutions UK Ltd | Education | 2025 |
| A-Personel Painting Ltd | Construction | 2018 |
| A. S. D. WH Holdings Limited | Extraterritorial | 2016 |
| A.C.C.E.S.S 2016 Limited | Health & social care | 2016 |
| A.C.P. (Acoustics) Limited | Wholesale & retail | 1979 |
| A.K. Bryan Mould Engineers Limited | Manufacturing | 1993 |
| A.Mccarron Services Ltd | Construction | 2024 |
| A2R Electrical Services Ltd | Manufacturing | 2018 |
| Aarna Brasserie Ltd | Hospitality | 2024 |
| Aarna Fresh Bites Limited | Hospitality | 2026 |
| Aaron Gage Richards Limited | Other services | 2019 |
| Aaron Hollingworth Limited | Construction | 2016 |
| AAT Miller Limited | Real estate | 2021 |
| Aathira Limited | Wholesale & retail | 2021 |
| AAZ Property Group Ltd | Real estate | 2026 |
| Aazan Services Ltd | Transport & logistics | 2023 |
| Abbie's Flowers Limited | Wholesale & retail | 2018 |
| Able Building Company Ltd | Construction | 2018 |
| ABP Holdings Ltd | Real estate | 2013 |
| Absolute 20 Limited | Arts & recreation | 2019 |
| Absolute 20 Minutes Ltd | Arts & recreation | 2019 |
| Absolute City of London Ltd | Other services | 2025 |
| Absolute Hemel Ltd | Arts & recreation | 2025 |
| AC Homes Limited | Real estate | 2024 |
| ACB Electrical (Notts) Ltd | Construction | 2022 |
| Ace of Spray Ltd | Manufacturing | 2013 |
| Action for Construction Limited | Other services | 2016 |
| Active Minds Nottingham Community Interest Company | Health & social care | 2020 |
| Acut Wholesale Ltd | Administrative & support | 2025 |
| AD8284 Holdings Limited | Financial services | 2023 |
| ADA Cars and Parts Ltd | Wholesale & retail | 2023 |
| Adaz Childcare Limited | Health & social care | 2025 |
| Adco Properties (Mansfield) Limited | Administrative & support | 2003 |
| Admore Logistics Ltd | Wholesale & retail | 2023 |
| Advanced Clinical and Pharmaceutical Solutions Ltd | Health & social care | 2022 |
| Advanced Composites Limited | Construction | 2020 |
| Adys Gym Ltd | Arts & recreation | 2020 |
| AEN Property Holdings Ltd | Real estate | 2023 |
| Affordable Carpets & Vinyls Limited | Wholesale & retail | 2019 |
| AG Agencies Ltd | Wholesale & retail | 2015 |
| AGA Pizza Ltd | Hospitality | 2019 |
| AGM Tooling Ltd | Professional & scientific | 2026 |
| Ahmad USM Ltd | Wholesale & retail | 2025 |
| Aircooled HUT UK Limited | Professional & scientific | 2018 |
| Airwave Air Conditioning Ltd | Energy | 2020 |
| AJ & J Services Limited | Wholesale & retail | 2025 |
| AJ Product Services Ltd | Wholesale & retail | 2019 |
| AJ RAY Properties Ltd | Hospitality | 2024 |
| Ajay Developments Ltd | Construction | 2023 |
| AJC Fleet Operator Services Limited | Transport & logistics | 2019 |
| AJC Surveying Limited | Professional & scientific | 2018 |
| AJP Fire Ltd | Construction | 2025 |
| Akjb Ltd | Wholesale & retail | 2026 |
| Alan Fretwell Transport Limited | Transport & logistics | 2013 |
| Alessia Dinca Ltd | Transport & logistics | 2018 |
| Alfa Kebabs Ltd | Hospitality | 2025 |
| Alfanum UK Ltd | Hospitality | 2023 |
| Alford Pubs Limited | Hospitality | 2016 |
| Alfreton Jade Limited | Hospitality | 2020 |
| Ali's Classic Barber Ltd | Other services | 2023 |
| Alison Builders Caremost (Maintenance) Limited | Construction | 2010 |
| ALL Saints (Yorkshire) Ltd | Construction | 1999 |
| ALL Saints Centre Huthwaite Ltd | Other services | 2005 |
| ALL Star Printing Ltd | Wholesale & retail | 2025 |
| Allcock Family Estates Limited | Real estate | 2025 |
| Alloy Refurb's Ltd | Wholesale & retail | 2010 |
| Allsave Textiles Limited | Wholesale & retail | 2010 |
| Almas Investments Ltd | Real estate | 2022 |
| Alpha Joinery (Midlands) Ltd | Construction | 2014 |
| Alpha Radiology Solutions Ltd | Health & social care | 2026 |
| Alpha Security Management Limited | Real estate | 2000 |
| Altinbox Ltd | Hospitality | 2024 |
| Alymar Aesthetics Ltd | Other services | 2019 |
| Amin-Abode Ltd | Real estate | 2025 |
| Amino Road Ltd | Manufacturing | 2025 |
| AMM Couriers Ltd | Transport & logistics | 2017 |
| Ampco 168 Limited | Financial services | 2023 |
| Ampsplus UK Ltd | Wholesale & retail | 2020 |
| Anabella Apartments Ltd | Hospitality | 2024 |
| AND Richard Ltd | Real estate | 2026 |
| Andersons Renewables Limited | Other services | 2024 |
| Andrew Gardening & Landscape Ltd | Administrative & support | 2025 |