| 8 Belle VUE Place RTM Company Ltd | Households | 2022 |
| 8 Sages Ltd | Administrative & support | 2025 |
| 83 Baxter Avenue RTM Company Limited | Real estate | 2014 |
| 88 Pall Mall Limited | Households | 2024 |
| 88 York Road RTM Company Limited | Households | 2022 |
| 8BALLMKT Ltd | Professional & scientific | 2025 |
| 9 Kilworth Avenue Management Account Ltd | Households | 2021 |
| 9 Old School Court Limited | Real estate | 2017 |
| 9 Richmond Street RTM Company Limited | Real estate | 2012 |
| 9 Wellington Crescent Freehold Limited | Households | 2023 |
| 9 Wimborne Road Residents Limited | Real estate | 2021 |
| 92 Northview Drive Management Company Limited | Households | 2012 |
| 95 the Ridgeway Management Company Limited | Households | 2000 |
| 96/98 Gloucester Place Limited | Administrative & support | 2011 |
| 97 Victoria Avenue Limited | Households | 1990 |
| 99 High Street Private Limited | Hospitality | 2025 |
| A & B Concrete Pumping Limited | Construction | 2017 |
| A & B Plant Limited | Administrative & support | 2001 |
| A & G Service Solutions Limited | Administrative & support | 2025 |
| A & J Southend Limited | Hospitality | 2023 |
| A & R Elite Holdings Ltd | Construction | 2011 |
| A & R Elite Scaffolding Ltd | Construction | 2009 |
| A & R Motors Engineering Limited | Wholesale & retail | 2014 |
| A B Transport Compliance Services Ltd | Professional & scientific | 2026 |
| A Brown Mortgage Services Limited | Financial services | 2016 |
| A C Consultancy Design Limited | Administrative & support | 2011 |
| A Cowell Ltd | Health & social care | 2019 |
| A Drake Electrical Ltd | Construction | 2016 |
| A Handyman Limited | Construction | 2018 |
| A J Investment Holdings Limited | Real estate | 2025 |
| A J Property Developments Limited | Construction | 2001 |
| A L Risk Solutions Limited | Financial services | 2008 |
| A L Treasure Properties Ltd | Households | 2026 |
| A LU Pigus Ltd | Transport & logistics | 2016 |
| A Nimoni Limited | Professional & scientific | 2015 |
| A S W Developments Limited | Construction | 2017 |
| A Tiny Horse Ltd | Professional & scientific | 2022 |
| A Zekthi Limited | Construction | 2016 |
| A'Tis-Eau Limited | Construction | 2006 |
| A. & P. Motors Limited | Wholesale & retail | 1993 |
| A. D. Resources (INT) Ltd | Construction | 2018 |
| A. Hastings Ltd | Professional & scientific | 2019 |
| A. J. Bone & Sons Limited | Administrative & support | 2017 |
| A. R. GAS Heating & Plumbing Services Limited | Construction | 2015 |
| A.A. Lock Transport (Headcorn) Limited | Transport & logistics | 1974 |
| A.J. Wait & Co. Limited | Construction | 1978 |
| A.Nt Drips Therapy & Aesthetics Ltd | Other services | 2025 |
| A.Peal Limited | Professional & scientific | 2018 |
| A.V. and B.V. Andrews Limited | Wholesale & retail | 1975 |
| A.W. Hardy & Co. Limited | Construction | 1958 |
| A1 Construction & Refurbishment Ltd | Construction | 2024 |
| A1 Extinguishers Ltd | Public administration | 2019 |
| A1 Glazing Solutions Ltd | Construction | 2016 |
| A1 Safety Ltd | Professional & scientific | 2024 |
| A1 Skate Ramps Ltd | Manufacturing | 2023 |
| A2 Project Ltd | Administrative & support | 2021 |
| A2DMEDIASERVICES.CO Limited | Information & communication | 2019 |
| A2W Consultants Limited | Other services | 2005 |
| AA Air Services Limited | Construction | 2020 |
| AA Cleaning Services Southend Ltd | Administrative & support | 2021 |
| AA Reporting Services Ltd | Health & social care | 2022 |
| AA Star Home Limited | Real estate | 2025 |
| AAA Foods Ltd | Wholesale & retail | 2024 |
| AAA Global Solutions Ltd | Transport & logistics | 2013 |
| AAA Vehicle Sales Ltd | Wholesale & retail | 2023 |
| Aacorn Project Management Ltd | Professional & scientific | 2016 |
| Aagam Ltd | Health & social care | 2023 |
| Aagaran Engineering Ltd | Construction | 2014 |
| Aaka Services Limited | Wholesale & retail | 2015 |
| Aaraa Technologies Ltd. | Information & communication | 2013 |
| Aareen Properties Limited | Real estate | 2014 |
| Aareez Trading Company Limited | Wholesale & retail | 2024 |
| Aarna Tech Solutions Ltd | Information & communication | 2017 |
| Aaron Trinidade Limited | Health & social care | 2016 |
| Aayan Maryam Ltd | Hospitality | 2022 |
| AB Bowen Limited | Wholesale & retail | 2016 |
| Abbey Mortimer Holdings Limited | Professional & scientific | 2019 |
| Abbey Engineering Services Limited | Manufacturing | 2009 |
| Abbey Pipework Fabricators Limited | Manufacturing | 2011 |
| Abbey Pipework Limited | Extraterritorial | 2018 |
| Abbey Stainless Pipework Limited | Manufacturing | 2023 |
| Abbeyfab Limited | Extraterritorial | 2018 |
| Abbeystar Print Solutions Limited | Manufacturing | 2009 |
| Abbots Walk Management Company Limited | Households | 1979 |
| ABC Club | Education | 2022 |
| ABC Social Care Limited | Health & social care | 2014 |
| Abena & Arish Ltd | Hospitality | 2018 |
| ABI Food Limited | Wholesale & retail | 2009 |
| Abided Ltd | Wholesale & retail | 2025 |
| Abijoh Limited | Construction | 2019 |
| Abode Stone Ltd | Manufacturing | 2014 |
| Abode UK (Nationwide) Limited | Real estate | 2015 |
| Abraham & Associates Accountants Limited | Professional & scientific | 2017 |
| Abraham and Associates Limited | Professional & scientific | 2011 |
| ABS Property (Essex) Limited | Real estate | 2014 |
| Absolute Adaptions Limited | Construction | 2010 |
| Absolute Leak Detection Limited | Construction | 2017 |
| Absolute Properties (Essex) Limited | Real estate | 2024 |
| Absolute Properties Management Limited | Real estate | 2022 |
| Absolute Water Group Limited | Manufacturing | 2021 |