| Alaz IMT Limited | Hospitality | 2025 |
| Aldred Cricket Bats Ltd | Manufacturing | 2021 |
| Alect Electrical Services Limited | Construction | 2017 |
| Alect Holdings Limited | Financial services | 2020 |
| Alect Investments Limited | Real estate | 2021 |
| Alex Gardner Limited | Real estate | 2019 |
| Alexin Healthcare C.I.C. | Health & social care | 2013 |
| ALI Erdem Ltd | Wholesale & retail | 2025 |
| Alice Rail Ltd | Construction | 2025 |
| Alien Motorcycles Ltd | Wholesale & retail | 2016 |
| ALL Grab Limited | Manufacturing | 2016 |
| ALL Seasons Clean Ltd | Administrative & support | 2019 |
| ALL Tied UP (UK) Limited | Manufacturing | 2012 |
| Allyear Healthcare Solutions Ltd | Health & social care | 2015 |
| Alrate George - Waste Removals & Recycling Ltd | Water & waste | 2025 |
| Alrate George! Waste Removals Ltd | Water & waste | 2024 |
| Alron Property Services Limited | Construction | 2025 |
| Alshikh Cars Limited | Wholesale & retail | 2019 |
| Altis Investments Ltd | Real estate | 2024 |
| Alvic Projects Ltd | Construction | 2026 |
| ALW Joinery Ltd | Construction | 2020 |
| Alycidon Limited | Financial services | 2014 |
| Alycidon Properties Limited | Arts & recreation | 2019 |
| Alycidon Technologies Limited | Financial services | 2014 |
| AM Landscapes (Manchester) Ltd | Households | 2026 |
| AM Maintenance Contractors Ltd | Households | 2024 |
| AM Pumps and Components Ltd | Wholesale & retail | 2019 |
| Amalfi Gifts Ltd | Wholesale & retail | 2020 |
| Amalfi Woman Concessions Limited | Wholesale & retail | 2018 |
| Amalfi Woman Limited | Wholesale & retail | 2016 |
| Amber Court (Leisure) Limited | Real estate | 1964 |
| Amber Flat Roofing Limited | Construction | 2022 |
| Amber Manor Landscaping and Driveways Limited | Administrative & support | 2026 |
| Amber Prinny Limited | Construction | 2019 |
| Amber Valley Association for Mental Health Ltd | Health & social care | 1997 |
| Ambervale Estates Limited | Real estate | 2002 |
| Ameldar Limited | Construction | 2018 |
| AMH Coding Limited | Professional & scientific | 2015 |
| Amma Management Limited | Energy | 2011 |
| AMR Consulting and Trading Ltd | Financial services | 2025 |
| AND Automation Limited | Professional & scientific | 2002 |
| Anderson Plumbing & Heating Services Ltd | Construction | 2020 |
| Andrew Hindes Interiors Ltd | Construction | 2017 |
| Annies Coffee Shop Limited | Hospitality | 2021 |
| ANY Four Walls Ltd | Real estate | 2023 |
| AP Company Holdings Ltd | Administrative & support | 2024 |
| AP Dermatology Ltd | Health & social care | 2023 |
| Apex Bespoke Finishings Ltd | Construction | 2019 |
| Apex Studio Ltd | Construction | 2025 |
| APM Solutions Ltd | Administrative & support | 2021 |
| Apollo DJS Limited | Arts & recreation | 2024 |
| Applied Water Resources Ltd | Construction | 2024 |
| AR Property Maintenance (Ilkeston) Ltd | Construction | 2026 |
| Arbury Farm Estates Limited | Extraterritorial | 2021 |
| Archer Signs Derby Ltd | Wholesale & retail | 2023 |
| Archway I. T. Limited | Information & communication | 2015 |
| Area Controlled Security Ltd | Administrative & support | 2017 |
| Arena Community | Administrative & support | 2004 |
| Arete Development Group Limited | Construction | 2018 |
| Ariana Retail Ltd | Wholesale & retail | 2024 |
| ARL Holdings Limited | Financial services | 2026 |
| Arlo Properties (Midlands) Limited | Real estate | 2021 |
| Arrival Square Limited | Real estate | 2009 |
| Art and Abode Limited | Real estate | 2024 |
| Art Deco Ltd | Wholesale & retail | 2024 |
| Artesca Properties Ltd | Real estate | 2022 |
| Artesca Property Group Ltd | Real estate | 2026 |
| Artesca Property Maintenance Ltd | Construction | 2026 |
| Artex LG Ltd | Manufacturing | 2015 |
| Artisan Glazing Limited | Construction | 2020 |
| AS Building and Groundworks Limited | Construction | 2024 |
| ASB Training (Derbyshire) Ltd | Education | 2018 |
| ASH G Construction Ltd | Construction | 2021 |
| Ashgate Care Limited | Health & social care | 2004 |
| Ashley News Limited | Wholesale & retail | 2023 |
| Ashleyjai Properties Ltd | Real estate | 2016 |
| ASP Building Maintenance & Development Services Ltd | Construction | 2025 |
| Aspect Doors and Windows Ltd | Manufacturing | 2018 |
| Aspire Electrics & Renovations Ltd | Construction | 2015 |
| Assesseco Limited | Construction | 2024 |
| Associated Independent Electrical Wholesalers Limited | Other services | 2001 |
| Assured Passive Fire Protection Limited | Manufacturing | 2010 |
| Astle Electrical Products Ltd | Manufacturing | 2002 |
| Asura Technology Limited | Professional & scientific | 2015 |
| AT Safety Ltd | Other services | 2022 |
| Atherton Signs & Installations Limited | Other services | 2017 |
| Atlanta Entertainments Agency Ltd | Arts & recreation | 2001 |
| Atlas Composite Defence Limited | Manufacturing | 2020 |
| Atlas Composite Technologies Limited | Manufacturing | 2017 |
| Atlas Defence Limited | Manufacturing | 2017 |
| ATR Public Services Ltd | Hospitality | 2026 |
| Atta Holdings Limited | Financial services | 2015 |
| Attenborough Doors Limited | Manufacturing | 1986 |
| Attenborough Shopfronts Limited | Professional & scientific | 2008 |
| Aujla (UK) Limited | Real estate | 2007 |
| Aujla Lettings Ltd | Real estate | 2023 |
| Auto Centre Ilkeston Limited | Wholesale & retail | 2019 |
| Autoplus (Ilkeston) Limited | Wholesale & retail | 2013 |
| Autoplus Garage Limited | Wholesale & retail | 2024 |
| Autoplus Limited | Wholesale & retail | 1967 |