| 1-4 Proctor Place Management Limited | Households | 2025 |
| 100XREVENUE Ltd | Professional & scientific | 2026 |
| 118 Security Ltd | Administrative & support | 2018 |
| 149 Wennington Road RTM Company Limited | Real estate | 2014 |
| 1808 Properties Ltd | Real estate | 2017 |
| 19 LA Limited | Real estate | 2022 |
| 1ST Call Care 247 Ltd | Administrative & support | 2026 |
| 1ST Container Conversion Limited | Construction | 2026 |
| 1ST Containers (UK) EOT Trustees Limited | Professional & scientific | 2023 |
| 1ST Containers (UK) Limited | Wholesale & retail | 2004 |
| 247 Pro Ltd | Real estate | 2025 |
| 28 Broadway Limited | Other services | 2019 |
| 289 Rainham Road RTM Company Limited | Hospitality | 2010 |
| 2KFP Ltd | Real estate | 2025 |
| 2ZF Limited | Wholesale & retail | 2024 |
| 313 Car Hire Ltd | Administrative & support | 2024 |
| 313 Car Traders Ltd | Wholesale & retail | 2025 |
| 3A Building Services Ltd | Construction | 2017 |
| 41 Friendly Limited | Real estate | 2023 |
| 42ND Solutions Limited | Information & communication | 2017 |
| 4L Systems Ltd | Information & communication | 2016 |
| 4RS (UK) Limited | Health & social care | 2014 |
| 5 Square Limited | Real estate | 2020 |
| 5DYKS Company Limited | Health & social care | 2020 |
| 7 Packaging Co. Ltd | Wholesale & retail | 2004 |
| 7 Pillars Holdings Ltd | Professional & scientific | 2025 |
| 786 Recycling Ltd | Water & waste | 2024 |
| 85 Ellerton Road Ltd | Households | 2012 |
| A & a Fashion Mania Limited | Wholesale & retail | 2014 |
| A & a Professsional Services Ltd | Extraterritorial | 2024 |
| A & D Construction Ltd | Real estate | 2025 |
| A & M Hire Limited | Transport & logistics | 2022 |
| A 2 Z Garage Limited | Wholesale & retail | 2017 |
| A and D Consultants Ltd | Other services | 2018 |
| A and L Ever Ready Cleaning and Building Maintenance Services Ltd | Administrative & support | 2012 |
| A B Car Traders Ltd | Wholesale & retail | 2019 |
| A Construction Professional Builds Limited | Construction | 2022 |
| A Little Bargain Ltd | Administrative & support | 2019 |
| A M Tiling (South East) Limited | Construction | 2015 |
| A to B Contracts & Flooring Ltd | Construction | 2017 |
| A&A Goga Ltd Ltd | Construction | 2026 |
| A&A Serices Ltd | Health & social care | 2024 |
| A&Co Bespoke Ltd | Manufacturing | 2025 |
| A&D Allaboutfood Limited | Hospitality | 2024 |
| A&G Renovations Ltd | Construction | 2014 |
| A&H Accounting and Consultancy Ltd | Professional & scientific | 2023 |
| A&H E-Commerce Ltd | Wholesale & retail | 2025 |
| A&H Property Group Ltd | Construction | 2025 |
| A&K Civil Engineering Ltd | Construction | 2025 |
| A&M Lucy Trans Ltd | Transport & logistics | 2019 |
| A&R Munteanu Ltd | Water & waste | 2022 |
| A&S Group Events Ltd | Hospitality | 2025 |
| A&T Smart Properties Ltd | Real estate | 2024 |
| A. H. Newbury (Continental Freight) Limited | | 1977 |
| A.G Sons Motors Limited | Wholesale & retail | 2023 |
| A.R Equestrian Ltd | Wholesale & retail | 2019 |
| A.T.Brown & Co,Limited | Manufacturing | 1945 |
| A1 Pharmaceuticals Holdings Limited | Manufacturing | 2013 |
| A1 Pharmaceuticals International Ltd | Wholesale & retail | 2023 |
| A1 Pharmaceuticals Public Limited Company | Wholesale & retail | 1992 |
| A1 Property Assets Holdings Limited | Other services | 2017 |
| A1 Property Assets Management Limited | Other services | 2017 |
| A1 Property Management (U.K.) Limited | Other services | 2017 |
| A13 Cleaning Supplies Ltd | Wholesale & retail | 2021 |
| A13 Commercial Salvage Ltd | Wholesale & retail | 2021 |
| A2B Motor Services Limited | Manufacturing | 2016 |
| A2B Transport & Haulage Ltd | Transport & logistics | 2025 |
| A2Z IT Limited | Information & communication | 2025 |
| A2Z Roofing & Guttering Ltd | Construction | 2025 |
| AA Associates Solutions Ltd | Professional & scientific | 2022 |
| AA Car Hire Ltd | Administrative & support | 2025 |
| AA Comms Ltd | Information & communication | 2024 |
| Aaban Services Limited | Information & communication | 2019 |
| Aacekin Ltd | Real estate | 2021 |
| Aamarni Multiservices Ltd | Professional & scientific | 2022 |
| Aappens Limited | Hospitality | 2023 |
| Aarnie’S Limited | Health & social care | 2021 |
| Aaron's Surplus Army & Navy Limited | Wholesale & retail | 2011 |
| Aarvi Residences Ltd | Real estate | 2026 |
| AB Altea Ltd | Construction | 2017 |
| AB Construction (Essex) Ltd | Construction | 2022 |
| AB Construction Essex New Build Ltd | Construction | 2026 |
| AB Voltedge Limited | Construction | 2025 |
| Abashon Properties Ltd | Real estate | 2022 |
| Abbey Accountancy & Taxation Services Ltd | Professional & scientific | 2013 |
| Abbey Auto Repairs Limited | Wholesale & retail | 2013 |
| Abbey Estate Agents Limited | Real estate | 2006 |
| ABC Contracts Ltd | Construction | 2022 |
| ABC Hausemaster Limited | Administrative & support | 2012 |
| ABC Project Limited | Construction | 2019 |
| ABC Security Ltd | Administrative & support | 2025 |
| ABD Express Ltd | Transport & logistics | 2025 |
| Abdul and Aneesa Ltd | Information & communication | 2025 |
| Abridge Fire Limited | Construction | 2017 |
| Absham Services Ltd | Health & social care | 2025 |
| Absolute Inventories Limited | Other services | 2023 |
| Absolute Yoga and Pilates Ltd | Arts & recreation | 2019 |
| AC Power Electrical Contractors Ltd | Construction | 2026 |
| ACB Developments Limited | Construction | 2026 |
| Accentoire Ltd | Administrative & support | 2021 |