| 00 Cabs Limited | Transport & logistics | 2019 |
| 1 for the Frog Limited | Hospitality | 2024 |
| 1 TAU Ltd | Financial services | 2021 |
| 116-120 Brixton Hill Limited | Households | 2025 |
| 1210 Properties Ltd | Real estate | 2025 |
| 134 Rosebery Avenue Management Company Limited | Households | 1985 |
| 154 Ventures Limited | Real estate | 2021 |
| 175 S B R Limited | Households | 2005 |
| 2 Britannia Street Management Company Limited | Households | 2018 |
| 2 Castellain Road Limited | Households | 1998 |
| 2 for the Frog Limited | Hospitality | 2024 |
| 21 Gambetta Street Freehold Limited | Households | 2014 |
| 25 ST Mark Road Benfleet Ltd | Households | 2025 |
| 29 Everton Road Yeovil Ltd | Households | 2023 |
| 298 OBR Limited | Households | 2019 |
| 3 Dimensions of FUN Ltd | Wholesale & retail | 2025 |
| 32 Holland Park (Residents) Limited | Extraterritorial | 1996 |
| 37 Larchwood DC Limited | Hospitality | 2020 |
| 3G Transport Limited | Transport & logistics | 2015 |
| 3T Restoration Ltd | Construction | 2021 |
| 44 New Canal Management Ltd | Households | 2025 |
| 4B4 Ltd | Information & communication | 2012 |
| 4MS Developments Limited | Real estate | 2024 |
| 4WHEATON Limited | Households | 2018 |
| 5 Cotham Lawn Road Management Company Ltd | Households | 2025 |
| 5 Stars Carwash Ltd | Wholesale & retail | 2023 |
| 57 Homes Limited | Construction | 2018 |
| 7 Days Market Ltd | Wholesale & retail | 2018 |
| 7 Days Orange Shop Ltd | Wholesale & retail | 2025 |
| 75 Tankerville Road (Freehold) Limited | Households | 2017 |
| 9 Plummers Hill Management Company Limited | Extraterritorial | 2014 |
| 98 Goldcroft Yeovil Limited | Households | 1990 |
| A & a Packaging Company Unlimited | Wholesale & retail | 2004 |
| A & D Garage Doors Ltd | Administrative & support | 2009 |
| A & O Financial Services Limited | Financial services | 2010 |
| A & R Automotive (South West) Limited | Wholesale & retail | 2011 |
| A & S Eagle Company Ltd | Hospitality | 2024 |
| A Anaesthetics Ltd | Health & social care | 2016 |
| A and S Carehome Limited | Health & social care | 2017 |
| A C Powder Coatings Ltd | Manufacturing | 2023 |
| A J Fencing & Landscaping (SW) Ltd | Construction | 2022 |
| A J Roberts & SON Limited | Agriculture & fishing | 2015 |
| A K W Tyre Services Ltd | Wholesale & retail | 2012 |
| A Tiling Specialist Ltd | Construction | 2019 |
| A to Z Repair Shop Limited | Wholesale & retail | 2018 |
| A V Optics Limited | Manufacturing | 2005 |
| A V Windows Ltd | Construction | 2019 |
| A&A Health Solution Limited | Health & social care | 2025 |
| A&E Land Rover Services Ltd | Wholesale & retail | 2023 |
| A&T Mitchell Ltd | Hospitality | 2022 |
| A.E. Finch Garages Limited | Wholesale & retail | 1978 |
| A.M. Smith (Sparvil Homes) Limited | Construction | 1972 |
| A303 Scaffolding Ltd | Construction | 2026 |
| AAJ Catering Ltd | Hospitality | 2025 |
| AB FAB Process Pipework Ltd | Professional & scientific | 2016 |
| Abacus Care Limited | Real estate | 2018 |
| Abacus Tax Solutions Ltd | Professional & scientific | 2024 |
| Abbey Manor Capital Partners Limited | Extraterritorial | 2008 |
| Abbey Manor Developments Ltd | Extraterritorial | 1980 |
| Abbey Manor Group Pension Trustees Ltd | Professional & scientific | 1993 |
| Abbiexhooper Ltd | Information & communication | 2026 |
| Abdirahman Limited | Health & social care | 2025 |
| Abel Intelligence Ltd | Information & communication | 2026 |
| Abel Technologies Ltd | Information & communication | 2022 |
| Abhat Holdings Limited | Administrative & support | 2019 |
| Abhat Limited | Real estate | 2017 |
| Abhilash Pushparajan Limited | Construction | 2025 |
| Abilityavenue Care Ltd. | Health & social care | 2022 |
| Able 2 Achieve Limited | Education | 2009 |
| Able 2 Achieve Trust Limited | Education | 2012 |
| Ableson Roofing Limited | Construction | 2002 |
| ABM4 Electrical Limited | Construction | 2009 |
| ABM4 Holdings Limited | Real estate | 2017 |
| ABM4 Lets Limited | Hospitality | 2026 |
| AC Blast Solutions Ltd | Manufacturing | 2023 |
| Access Lifting Pulling & Safety Limited | Administrative & support | 2005 |
| Ace Taxis (Dorset) Limited | Transport & logistics | 2014 |
| ACL Software Limited | Information & communication | 1994 |
| Acorn Accounting for Business Limited | Professional & scientific | 2004 |
| Acre Somerset Limited | Other services | 2026 |
| Active Roma CIC | Professional & scientific | 2026 |
| AD Hair and Beauty Limited | Other services | 2013 |
| AD Libitum Business Coaching Limited | Other services | 2010 |
| Adacore Ltd | Information & communication | 2018 |
| Adam C Taylor Ltd | Construction | 2011 |
| Addis Services Ltd | Real estate | 2025 |
| Adonai Estates Ltd | Real estate | 2019 |
| Adski 2000 Limited | Agriculture & fishing | 2000 |
| Advanced Chemical Specialties Limited | Manufacturing | 1996 |
| Advanced Innovation and Technology Ltd | Education | 2025 |
| Advansys Solutions Ltd | Information & communication | 2003 |
| Adventure Care Team Ltd | Education | 2025 |
| Aero Quality Solutions Ltd | Professional & scientific | 2022 |
| Aeropur Limited | Professional & scientific | 2017 |
| Aerostem Limited | Manufacturing | 2026 |
| Afeard Ltd | Wholesale & retail | 2024 |
| Afro Art Records Ltd | Information & communication | 1999 |
| AFS1 Plevin Ltd | Financial services | 2021 |
| AG Construction Management Ltd | Professional & scientific | 2025 |
| AG Industries Limited | Wholesale & retail | 2014 |