| 1-3 Oban Road (Southend) Limited | Professional & scientific | 2001 |
| 13TH Element Limited | Manufacturing | 2014 |
| 165 Central Avenue RTM Company Ltd | Households | 2026 |
| 1ST ACT Ltd | Education | 2012 |
| 2 & 2A Elmer Avenue RTM Company Limited | Households | 2023 |
| 2 Ashburnham Road RTM Company Ltd | Households | 2014 |
| 22 Point 4 Limited | Financial services | 2019 |
| 236 Ferry Road (Hullbridge) Limited | Households | 2023 |
| 27 Cannonsleigh Crescent RTM Company Ltd | Households | 2013 |
| 365 Football Limited | Households | 2023 |
| 3D Images Limited | Professional & scientific | 2025 |
| 4EDGE Limited | Manufacturing | 2003 |
| 5 Hastings Road RTM Company Ltd | Households | 2012 |
| 55 Babington Road Limited | Real estate | 2014 |
| 80 Lymington Avenue RTM Company Ltd | Households | 2014 |
| 90 Degree Angle Ltd | Information & communication | 2022 |
| 99 Greensward Lane Company Limited | Real estate | 2012 |
| A & L Interiors Limited | Manufacturing | 2017 |
| A & P Maintenance Ltd | Construction | 2021 |
| A & P Property Holdings Ltd | Real estate | 2021 |
| A B Smith Ltd | Construction | 2014 |
| A Class Building Services Limited | Other services | 2013 |
| A D Hemmings Building Services Ltd | Construction | 2016 |
| A J UK Solution Ltd | Other services | 2017 |
| A W Specialist Joinery Limited | Manufacturing | 2007 |
| A.Emms Limited | Other services | 2023 |
| A.V.A. Brickwork & Building Specialists Limited | Construction | 2024 |
| Abbee Cakes Limited | Extraterritorial | 2012 |
| Abberley Ltd | Extraterritorial | 2020 |
| Academy Schoolwear Wholesale Ltd | Transport & logistics | 2026 |
| Accept Recruitment Payroll Ltd | Administrative & support | 2023 |
| Accountancy Services Limited | Professional & scientific | 1986 |
| Acelocal Limited | Professional & scientific | 1988 |
| Activesync Ltd | Information & communication | 2026 |
| Addobees Consultancy Ltd | Professional & scientific | 2026 |
| Adjudication and Arbitration Services Limited | Professional & scientific | 2024 |
| Advance DRY Lining Limited | Construction | 2004 |
| Advanced Thermal Services Ltd | Construction | 2023 |
| Adventures in Utopia Limited | Administrative & support | 2017 |
| AE Living Ltd | Real estate | 2025 |
| AF1 International Limited | Wholesale & retail | 2025 |
| Air TEK Installations Limited | Construction | 2016 |
| Aitegic Ltd | Information & communication | 2023 |
| AJS Karting Ltd | Arts & recreation | 2024 |
| Akwaaba Capital Group Limited | Real estate | 2016 |
| Alamsa Ltd | Health & social care | 2025 |
| ALC Mizzi Investments Limited | Households | 2021 |
| Alderbrook Healthcare Limited | Health & social care | 2016 |
| Alex Naish Ltd | Information & communication | 2016 |
| Alius Finance Limited | Other services | 2018 |
| ALL GAS Solutions Ltd | Energy | 2002 |
| Allwood Joinery Limited | | 1985 |
| Allytuma Limited | Health & social care | 2018 |
| Alpha Interiors Ltd | Construction | 2014 |
| AM Tool Supplies Limited | Wholesale & retail | 2018 |
| Amalgamated Arts Limited | Extraterritorial | 2009 |
| Amantium Limited | Information & communication | 2020 |
| Amianthus Blue Consultants Ltd | Professional & scientific | 2018 |
| Ancean Limited | Financial services | 2022 |
| Andrew Milne Limited | Hospitality | 2021 |
| Anti-Poaching Support Unit Ltd | Other services | 2021 |
| Antique Revival Limited | Wholesale & retail | 2017 |
| AP Eyecare Limited | Health & social care | 2016 |
| Apex Security Group Limited | Administrative & support | 2026 |
| APG Estates Ltd | Real estate | 2012 |
| Appleton & Daughters Ltd | Real estate | 2024 |
| Ariabelle Property Holdings Ltd | Real estate | 2022 |
| Arthurs Lettings Limited | Households | 2022 |
| Ascend Equity Limited | Financial services | 2025 |
| Ashdown Tree Limited | Agriculture & fishing | 2020 |
| Ashtanga Yoga Essex Ltd | Arts & recreation | 2022 |
| ASK Ecology (Essex) Ltd | Professional & scientific | 2025 |
| Aspc Content Co Ltd | Information & communication | 2025 |
| Aspect Equipment Limited | Construction | 2014 |
| Aspect Solutions Limited | Construction | 2011 |
| Assioma Limited | Administrative & support | 2008 |
| Asto Building Services Limited | Construction | 2021 |
| Athrilliate Ltd | Information & communication | 2025 |
| Auburn Group Holdings Ltd | Financial services | 2023 |
| Auburn Group Ltd | Construction | 2022 |
| Auburn Group Services Ltd | Construction | 2023 |
| Auraview Group Ltd | Wholesale & retail | 2026 |
| Axion Drone Surveying Limited | Professional & scientific | 2025 |
| AYS Enterprises Ltd | Wholesale & retail | 2026 |
| B & T Rewinds (Holdings) 2011 Limited | Professional & scientific | 2011 |
| B&P Thermal Contracts Ltd | Construction | 2025 |
| B-Intentional Ltd | Professional & scientific | 2023 |
| B.H.L.R. Management Limited | Water & waste | 1996 |
| Badge BOY Ltd | Manufacturing | 2013 |
| Balanced by Wendy Limited | Health & social care | 2023 |
| Bankswood Construction (Essex) Ltd | Construction | 2017 |
| Barber Harbour UK Limited | Information & communication | 2019 |
| Bardown Barbeque Limited | Manufacturing | 2019 |
| Barker Woodrow Limited | Professional & scientific | 2019 |
| Barker Woodrow Properties Limited | Real estate | 2022 |
| Barker-Fullbrook Property Limited | Real estate | 2025 |
| Bathrooms Select Limited | Manufacturing | 1998 |
| BBT Futures Limited | Financial services | 2018 |
| Bcel Green Limited | Construction | 2022 |
| Bdhd Ltd | Administrative & support | 2025 |