| 036 Group Company Limited | Financial services | 2021 |
| 036 Group Limited | Financial services | 2021 |
| 1-12 Lily House RTM Company Ltd | Real estate | 2015 |
| 123CONNECT Limited | Information & communication | 2003 |
| 165 Camberwell Road RTM Company Ltd | Households | 2021 |
| 18PLUS Support Limited | Health & social care | 2021 |
| 1ST Friends Nursery Ltd | Health & social care | 2025 |
| 1ST Stop Maintenance Ltd | Construction | 2018 |
| 2 Worlds Ltd | Arts & recreation | 2015 |
| 24/7 Promotions Limited | Professional & scientific | 2026 |
| 2404 Ltd | Information & communication | 2022 |
| 2DEAN Consulting Ltd | Professional & scientific | 2024 |
| 30 Russell Street Management Limited | Households | 2007 |
| 314-316 Hart Road Management Company Limited | Households | 2001 |
| 3TEES Property Management Limited | Real estate | 2023 |
| 4 Safety Systems Ltd | Construction | 2023 |
| 4 Scaffold Ltd | Construction | 2019 |
| 4ENERGY Group Limited | Extraterritorial | 2015 |
| 4KALGROUP Ltd | Real estate | 2025 |
| 4LW Ltd | Administrative & support | 2023 |
| 4ZA Performance Ltd | Education | 2022 |
| 52 Everything Limited | Administrative & support | 2024 |
| 5C Group Ltd | Administrative & support | 2013 |
| 86 West Road Freehold Limited | Real estate | 2015 |
| A & I Accounting Services Limited | Professional & scientific | 2019 |
| A & L Developments (Essex) Ltd | Construction | 2024 |
| A & S Towbars Ltd | Wholesale & retail | 2006 |
| A B Wards Limited | Extraterritorial | 2000 |
| A F Theobald & SON Limited | Agriculture & fishing | 2013 |
| A J F Contracts (Essex) Ltd | Construction | 2020 |
| A L Taverns (WBY) Ltd | Hospitality | 2023 |
| A L Taverns Limited | Hospitality | 2023 |
| A Pattison Limited | Other services | 2023 |
| A R Cornell Limited | Health & social care | 1966 |
| A S Computer Systems Ltd | Information & communication | 2016 |
| A. Maylen's Traditional Builders Limited | Construction | 2017 |
| A.A.C. Electric Limited | Wholesale & retail | 1983 |
| A.J.G. Interiors Limited | Construction | 2021 |
| A.M.S. (South East) Fabrications Limited | Extraterritorial | 2025 |
| A.N. Woodhams & Co. Limited | Wholesale & retail | 1933 |
| A.P Tech Services Ltd | Professional & scientific | 2026 |
| A.R.C.S. Environmental Limited | Construction | 2003 |
| A.T. Maintenance & Remedials Limited | Construction | 2018 |
| A.T.G. Asbestos Services Ltd | Water & waste | 2015 |
| A1 Plumbing & Heating Solutions Limited | Administrative & support | 2009 |
| A127 Services Ltd | Wholesale & retail | 2014 |
| AA Cleaning Services (South) Limited | Administrative & support | 2012 |
| AAACE121FITNESS.CO.UK Limited | Arts & recreation | 2025 |
| AB Scaffolding (U.K) Ltd | Administrative & support | 2017 |
| ABA Childcare Ltd | Health & social care | 2021 |
| Abacus Accountancy (Essex) Ltd | Professional & scientific | 2002 |
| Abbeydean Limited | Administrative & support | 2003 |
| Abbeyfield Services Limited | Administrative & support | 2007 |
| Abbingdon Building Company Ltd | Construction | 2008 |
| Abbott Signs Limited | Manufacturing | 1999 |
| Abennett Co. Ltd | Public administration | 2019 |
| ABI (M&E) Limited | Wholesale & retail | 2005 |
| Ability Smart Ltd | Education | 2017 |
| Absolute Door Services Essex Limited | Construction | 2014 |
| Absolute PGM Ltd | Professional & scientific | 2019 |
| Absolute Smarts Limited | Wholesale & retail | 2017 |
| ABW Motorsport Limited | Wholesale & retail | 2016 |
| AC Delivery Ltd | Transport & logistics | 2021 |
| AC Fencing Limited | Construction | 2021 |
| Academics Against Assault CIC | Education | 2025 |
| Academy Aerials Ltd | Other services | 2015 |
| Accident Repair Centre Solutions Limited | Wholesale & retail | 2023 |
| Acclaim Contracts Holding Limited | Financial services | 2022 |
| Acclaim Contracts Limited | Construction | 1984 |
| Accountancy Club Limited | Professional & scientific | 2022 |
| Accountant Support Services Limited | Professional & scientific | 2021 |
| Accounting Techniq Limited | Professional & scientific | 2023 |
| Accura Logistics Ltd | Transport & logistics | 2026 |
| Accura Shipping Limited | Transport & logistics | 2000 |
| ACD (Arboriculture) Limited | Professional & scientific | 2007 |
| ACD (Landscape Architects) Limited | Professional & scientific | 1986 |
| ACD (Landscape Architects) Southampton Limited | Administrative & support | 2006 |
| ACD Archaeology Limited | Professional & scientific | 2012 |
| ACD Ecology Limited | Extraterritorial | 2009 |
| ACD Environmental Limited | Professional & scientific | 2012 |
| ACD Sustain Limited | Professional & scientific | 2011 |
| Ace Solar Power Ltd | Construction | 2010 |
| Acit Solutions Limited | Information & communication | 1999 |
| ACL GP Limited | Construction | 2012 |
| Acorn Industrial Rubber Solutions Ltd | Manufacturing | 2016 |
| Acreage Property Development Ltd | Real estate | 2024 |
| ACT Center Ltd | Transport & logistics | 2019 |
| Active Mastics Limited | Construction | 2007 |
| Active Motor Services Limited | Wholesale & retail | 2006 |
| ADA Construction Limited | Construction | 2003 |
| ADC Environment Limited | Information & communication | 2007 |
| Addstack Holdings Limited | Financial services | 2019 |
| Addstack Limited | Administrative & support | 1989 |
| Addstack Management Services Limited | Construction | 2024 |
| Adept Air Conditioning Ltd | Construction | 2007 |
| ADG Financial Consultants Limited | Financial services | 2012 |
| ADM Martyn Ltd | Manufacturing | 2021 |
| Adopt Labs Limited | Administrative & support | 2024 |
| Adprop Holdings Ltd | Real estate | 2020 |
| ADR Holdings Essex Ltd | Real estate | 2020 |