| 1 Build Construction Limited | Construction | 2025 |
| 1 Build Design & Development (Midlands) Ltd | Construction | 2025 |
| 1 Build Design & Development Ltd | Construction | 2021 |
| 121 Local Accounting Ltd | Professional & scientific | 2013 |
| 1884 Spirit Co. Limited | Wholesale & retail | 2024 |
| 22 Century Design Ltd | Professional & scientific | 2019 |
| 22T Limited | Administrative & support | 2021 |
| 24 Lemon Limited | Wholesale & retail | 2010 |
| 27 Musical London Limited | Arts & recreation | 2016 |
| 3.1416 Limited | Professional & scientific | 2021 |
| 365 Manufacturing Ltd | Manufacturing | 2023 |
| 4 Paws Rescue and Relocation International C.I.C. | Agriculture & fishing | 2021 |
| 44SIXTEEN Ltd | Professional & scientific | 2025 |
| 4R Business Recovery Limited | Professional & scientific | 2010 |
| 4X4HQ Ltd | Wholesale & retail | 2019 |
| 5 Star Gutter Cleaning Services Ltd | Administrative & support | 2017 |
| 51 College Road LLP | | 2015 |
| 612 Properties Limited | Construction | 2016 |
| 612 Property Services Limited | Real estate | 2019 |
| A & C Clinical Ltd | Health & social care | 2022 |
| A & L Building Contractors Limited | Construction | 2020 |
| A C Valves & Controls Limited | Wholesale & retail | 1997 |
| A Lidwell Construction Ltd | Construction | 2014 |
| A Luchian Transport Ltd | Transport & logistics | 2019 |
| A P Morgan Associates Ltd | Real estate | 2025 |
| A Plus a Digital Ltd | Professional & scientific | 2022 |
| A Plus Express Ltd | Transport & logistics | 2023 |
| A to Z Body Repair Centre Ltd | Wholesale & retail | 2000 |
| A&L Bethell Limited | Construction | 2021 |
| A.C.G Property Investments Ltd | Real estate | 2024 |
| A.M Quality Lettings Ltd | Real estate | 2025 |
| A.M. Norris (Holdings) Limited | Professional & scientific | 2012 |
| A.M. Norris (Properties) Limited | Real estate | 2012 |
| A.M. Norris Limited | Construction | 1975 |
| A.P.P.M Contracts Ltd | Administrative & support | 1997 |
| A.U Transport Ltd | Transport & logistics | 2018 |
| A.W. & M.R. Abbott Limited | Construction | 2013 |
| A2B Logistical Solutions Limited | Transport & logistics | 2020 |
| Aafd Ltd | Real estate | 2020 |
| Aafd Services Ltd | Professional & scientific | 2018 |
| AAR Recruitment Solutions Ltd | Administrative & support | 2024 |
| Aarons Residential Care Ltd | Hospitality | 2025 |
| AB Clinical Research Limited | Administrative & support | 2005 |
| AB Sports Therapy & Wellness Clinic Limited | Other services | 2021 |
| ABA Cleaning and Support Services Ltd | Administrative & support | 2025 |
| Abbots Oak Country House Ltd | Hospitality | 2025 |
| Abbots Oak Dental Practice Limited | Health & social care | 2022 |
| ABC Roofing Services Limited | Construction | 2026 |
| ABG Commercial Services Ltd | Professional & scientific | 2022 |
| Ablane.Services Limited | Real estate | 2012 |
| ABLE2 Consulting Limited | Administrative & support | 2008 |
| Abns Investments Ltd | Professional & scientific | 2025 |
| ABW Information Tech Ltd | Information & communication | 2020 |
| AC Facilities Ltd | Construction | 2003 |
| AC Valve Alliance Group Holdings Limited | Wholesale & retail | 2024 |
| Accounted Four (Midlands) Limited | Professional & scientific | 2010 |
| Acgjhe Limited | Financial services | 2025 |
| ACP LAB Ltd | Manufacturing | 2024 |
| Acsp Ltd | Professional & scientific | 2022 |
| Active Working C.I.C. | Professional & scientific | 2014 |
| Activity Island Limited | Hospitality | 1983 |
| Acumec Limited | Wholesale & retail | 2018 |
| Adam Dennis Plumbing and Heating Ltd | Construction | 2009 |
| Adam Warty Barber Limited | Other services | 2026 |
| ADI Garage Ltd | Wholesale & retail | 2024 |
| ADL Electrical and Maintenance Ltd | Construction | 2016 |
| ADM Diving & Technical Services Limited | Arts & recreation | 2005 |
| ADM Shine Analytics Limited | Professional & scientific | 2020 |
| ADM Shine Innovation Limited | Professional & scientific | 2020 |
| ADM Shine Ranges Limited | Professional & scientific | 2020 |
| ADM Shine Technologies Limited | Professional & scientific | 2005 |
| ADM Shine Training Limited | Education | 2015 |
| Adnox Limited | Hospitality | 2025 |
| Advance Housing Limited | Manufacturing | 2002 |
| Advance Private Healthcare Ltd | Professional & scientific | 2021 |
| Adventure Playschool Ltd | Education | 2019 |
| Aeromarine Composites Ltd | Manufacturing | 2025 |
| AG Portfolio Ltd | Information & communication | 2011 |
| Agar Thermal Insulations Ltd | Construction | 2023 |
| Agbtransport Services Ltd | Transport & logistics | 2024 |
| Agef Construction Ltd | Construction | 2026 |
| Aggregate Industries (England) Limited | Professional & scientific | 1932 |
| Aggregate Industries Limited | Extraterritorial | 2015 |
| Aggregate Industries Management Limited | Professional & scientific | 1966 |
| Aggregate Industries Slas Limited | Extraterritorial | 1994 |
| Aggregate Industries South West Limited | Professional & scientific | 1959 |
| AI Properties Limited | Real estate | 1970 |
| Aida CT Ltd | Transport & logistics | 2025 |
| Air Torque (UK) Limited | Manufacturing | 2008 |
| Airsoft Operators Box Ltd | Administrative & support | 2017 |
| Aisla Consulting Ltd | Professional & scientific | 2025 |
| Ajcity Cleaning & Solution Ltd | Administrative & support | 2025 |
| Ajeen Limited | Hospitality | 2018 |
| AJN Limited | Real estate | 2025 |
| AK Global Ventures Ltd | Wholesale & retail | 2023 |
| AK Home & Property Services Ltd | Administrative & support | 2026 |
| AK Site Services Ltd | Professional & scientific | 2024 |
| Aksa International (UK) Limited | Manufacturing | 1998 |
| Akso Properties Ltd | Real estate | 2026 |
| Al-Rawi Company Limited | Financial services | 2025 |