| 01021314 Limited | Wholesale & retail | 1971 |
| 10 Villa Road Management Company Limited | Households | 2003 |
| 1ST 4 Stamps Limited | Administrative & support | 2007 |
| 215 Domestic Extensions Ltd | Professional & scientific | 2022 |
| 25 Ebers Road Management Company Limited | Households | 2002 |
| 28 LOW Street Limited | Other services | 1987 |
| 35 Newcastle Drive Limited | Real estate | 1997 |
| 3D Plant and Construction Ltd | Construction | 2003 |
| 4FRONT Security Limited | Administrative & support | 2006 |
| 80 Dovecote Road Limited | Extraterritorial | 2019 |
| A & B Cleaning Services Limited | Construction | 2005 |
| A & Z Accounting Services Limited | Professional & scientific | 2006 |
| A B Woods Limited | Construction | 2007 |
| A D Bacon Plastering Limited | Construction | 2007 |
| A F Fabrications Limited | Manufacturing | 1999 |
| A N Wallis & Company Limited | Manufacturing | 2000 |
| A Tolar Engineering Ltd | Professional & scientific | 2025 |
| A. B. Technology (Newark) Limited | Professional & scientific | 1994 |
| A. T. Alarms Ltd. | Administrative & support | 1995 |
| A.1. Kitchens and Bathrooms Limited | Construction | 1991 |
| A.Dolby Funeral Services Limited | Other services | 2004 |
| A.P.A.S. Ltd | Wholesale & retail | 2006 |
| A.R.D. (Mansfield) Limited | Construction | 2007 |
| A1 Steel Buildings Limited | Construction | 2005 |
| A10 Holdings Limited | Hospitality | 2025 |
| Abbey Heating Plumbing Services Limited | Construction | 2008 |
| Abel Office Machines Limited | Wholesale & retail | 1984 |
| ABI Business Insight Limited | Administrative & support | 2012 |
| Absolute Building Services (Nottingham) Limited | Construction | 2007 |
| Actionista Limited | Wholesale & retail | 2003 |
| Adam EWA Properties Ltd | Real estate | 2024 |
| Adam Farms Limited | Agriculture & fishing | 1994 |
| Adam Wallis Limited | Other services | 2003 |
| Adejumo Healthcare Services Ltd | Health & social care | 2020 |
| Adept GM Enterprises Ltd | Real estate | 2024 |
| Adkin Sinclair LLP | | 2007 |
| Advanced Assessments Ltd | Professional & scientific | 1999 |
| AFE Systems Limited | Construction | 2002 |
| Afima Trading Limited | Wholesale & retail | 2026 |
| AG Optical Limited | Financial services | 2004 |
| Air Conditioning & Chiller Co. Limited | Administrative & support | 2004 |
| Air Hairdressing Limited | Other services | 2006 |
| Al-Ain International Welfare Trust | Wholesale & retail | 2005 |
| Al-Karam Trust Limited | Education | 2016 |
| Aldborough Finance Limited | Financial services | 1986 |
| Alegra Associates Limited | Other services | 2004 |
| Alexander Calder Financial Limited | Administrative & support | 2007 |
| Alford Property Services Limited | Real estate | 2007 |
| ALL in the MIX Limited | Wholesale & retail | 2003 |
| Almaur Limited | Administrative & support | 2004 |
| Alpha Clean Limited | Health & social care | 2006 |
| AM Overseas Legal Services Ltd | Professional & scientific | 2026 |
| AMH Cleaning Limited | Administrative & support | 2007 |
| Ammar Properties Ltd | Real estate | 2022 |
| Anderson & Co Accountants Ltd | Professional & scientific | 2006 |
| ANJ Limited | Professional & scientific | 2003 |
| Anmol Private Limited | Health & social care | 2013 |
| Applied Apparel Limited | Manufacturing | 2007 |
| Aquavista Watersides 2 Ltd | Arts & recreation | 2021 |
| Aquavista Watersides Ltd | Arts & recreation | 2003 |
| Aquavista Watersides Topco Ltd | Financial services | 2021 |
| Arboretum Property Ltd | Real estate | 2002 |
| Arbs Investments Ltd | Real estate | 2022 |
| Ardex (GB) Limited | Wholesale & retail | 2005 |
| Ashfield Care Limited | Health & social care | 2003 |
| Ashfield Effluent Services Limited | Administrative & support | 1999 |
| Ashfield Hauliers Limited | Transport & logistics | 2005 |
| Ashfield Recovery Limited | Transport & logistics | 2005 |
| ASK Asset Management Limited | Construction | 2006 |
| Assured Financial Solutions UK Ltd | Financial services | 2004 |
| Assured Security Systems Limited | Construction | 2004 |
| Atkinsonadhdcare Ltd | Health & social care | 2025 |
| Atlas Building Design Services Limited | Administrative & support | 1997 |
| Ausol Limited | Wholesale & retail | 2003 |
| Autonetic Insurance & Pensions Services (A.I.P.S.) Limited | Financial services | 1983 |
| Avenham Associates Limited | Professional & scientific | 2004 |
| Averham Park Residents Association Limited | Water & waste | 1993 |
| Axiomatic Technology Limited | Information & communication | 1994 |
| AZ Fine Fettle Limited | Other services | 2024 |
| Azure Skin & Hair Clinic Ltd | Other services | 2024 |
| B & B Industrial Dismantling Limited | Construction | 1984 |
| B & J Carpets Limited | Wholesale & retail | 2002 |
| B & J Parr Racing Ltd | Arts & recreation | 2023 |
| B D S (Chesterfield) Limited | Wholesale & retail | 2006 |
| B D S (Nottm) LLP | | 2002 |
| B Dela Cruz Consultancy Limited | Information & communication | 2007 |
| B&ERNEST4LIFE Limited | Health & social care | 2025 |
| B.P.I Bespoke Project Installation Ltd | Construction | 2005 |
| Bailey-Taylor Haulage Limited | Transport & logistics | 1977 |
| Bale Insurance Brokers (Leicester) Limited | Financial services | 1946 |
| Bankwood Chauffeurs Ltd | Transport & logistics | 2024 |
| Barnsley Bate Limited | Professional & scientific | 1996 |
| Basil and Bassam Ltd | Health & social care | 2015 |
| Bassett & Ryder Limited | Construction | 2003 |
| Bassi Fashions Limited | Wholesale & retail | 1991 |
| Bay Tree Interiors Trustee Company Limited | Professional & scientific | 2021 |
| BBI Solutions Limited | Information & communication | 2008 |
| Bcode Direct Limited | Wholesale & retail | 2005 |
| BE Your Best Version Ltd | Professional & scientific | 2025 |
| Beacon LIT Ltd | Arts & recreation | 2022 |