| 118 Englefield Road Management Limited | Real estate | 2003 |
| 12 Market Cross Place Limited | Administrative & support | 2019 |
| 138 Wellesley Road RTM Company Limited | Households | 2011 |
| 1ST Call Jobs Ltd | Wholesale & retail | 2026 |
| 1ST Step Management Services Limited | Professional & scientific | 2005 |
| 20 Kings Avenue Management Company Limited | Real estate | 2006 |
| 247 Electrical Essex Ltd | Construction | 2025 |
| 247MEDIPLUS Limited | Health & social care | 2023 |
| 36 PCR Ltd | Real estate | 2023 |
| 360 Facilities Services Management Limited | Administrative & support | 2020 |
| 365CONCIERGE Ltd | Real estate | 2025 |
| 3DEXSERVICES Ltd | Manufacturing | 2025 |
| 3K Cleaning & Maintenance Ltd | Water & waste | 2025 |
| 4 Bunnies Ltd | Real estate | 2025 |
| 46/48 Beaumont Avenue Limited | Real estate | 2009 |
| 5-12 Branston Court Limited | Real estate | 2010 |
| 54 West Avenue RTM Company Limited | Households | 2007 |
| 5VE Guys Entertainments Ltd | Hospitality | 2020 |
| 6-10 (Evens) Granville Road RTM Company Limited | Households | 2020 |
| 6LYNWOOD Limited | Households | 2022 |
| 8BIT Automotive Ltd | Wholesale & retail | 2022 |
| 8BIT IT Solutions Ltd | Professional & scientific | 2022 |
| A & B Removals & Haulage Ltd | Transport & logistics | 2025 |
| A & G Furniture Ltd | Wholesale & retail | 2019 |
| A & H Livestock Ltd | Wholesale & retail | 2020 |
| A & R Glazing Ltd | Construction | 2017 |
| A Caines Groundworks Ltd | Construction | 2017 |
| A H Minibuses Limited | Transport & logistics | 2002 |
| A H Surveying & Cost Consultancy Ltd | Professional & scientific | 2014 |
| A L Wicken Carpenter & Building Contractors Limited | Construction | 2004 |
| A Stevens Engineering Ltd | Construction | 2019 |
| A W Steel Limited | Construction | 2023 |
| A Wright Electrical Solutions Ltd | Construction | 2014 |
| A&S Booth Holdings Limited | Financial services | 2025 |
| A. Thorpe Construction Limited | Construction | 2007 |
| A.J.T Property Investments Limited | Real estate | 2017 |
| A.L.H.R Farms Ltd | Wholesale & retail | 2022 |
| A1 Pet Welfare & Rescue Ltd | Agriculture & fishing | 2024 |
| A1 Ramps Ltd | Manufacturing | 2018 |
| A1 Van & Trucks Limited | Wholesale & retail | 2003 |
| A2 Scaffolding Ltd | Construction | 2025 |
| A2B Catering Ltd | Hospitality | 2022 |
| A2B Taxis Clacton Ltd | Transport & logistics | 2025 |
| AA Plumbing (UK) Ltd | Construction | 2013 |
| AA Recruitment and Services Limited | Administrative & support | 2025 |
| AA Scaffolding (Essex) Ltd | Construction | 2023 |
| Aa-Dama Ltd | Professional & scientific | 2024 |
| AAA Flavour Limited | Hospitality | 2022 |
| Abacus Shipping and Logistics Ltd | Transport & logistics | 2019 |
| Abaf Limited | Information & communication | 2019 |
| Abir and Aisha Properties Ltd | Real estate | 2025 |
| Abture Limited | Information & communication | 2025 |
| Academy UV Ltd | Education | 2020 |
| Access & Automation Limited | Administrative & support | 2007 |
| Access Maintenance Services Ltd | Construction | 2022 |
| Accord Fire Doors Ltd | Construction | 2025 |
| Accounticorn Limited | Professional & scientific | 2024 |
| Accounting for the Arts Limited | Professional & scientific | 2022 |
| Ace Air CON Ltd | Construction | 2020 |
| Ace Drainage Limited | Construction | 2010 |
| ACJ Real Estate Limited | Real estate | 2024 |
| Acorn Land Ltd | Real estate | 2006 |
| Acorns Digital Ltd | Information & communication | 2024 |
| Acorns Property Ltd | Real estate | 2022 |
| ACP Landscapes & Builders Limited | Administrative & support | 2017 |
| ACP Paving Limited | Construction | 2024 |
| ACT Drama Limited | Arts & recreation | 2025 |
| Activate Project CIC | Health & social care | 2025 |
| AD Prime Management Ltd | Real estate | 2025 |
| AD Prime Property Ltd | Real estate | 2025 |
| Adam's Piling Labour Essex Ltd | Construction | 2026 |
| Adastra Property Limited | Real estate | 2012 |
| ADD Barber Ltd | Other services | 2025 |
| Adgs Properties Ltd | Households | 2025 |
| ADI Accountancy Ltd | Professional & scientific | 2018 |
| Advance Extensions Ltd | Construction | 2021 |
| Advance Taste Ltd | Hospitality | 2023 |
| Advanced Netting Holdings Ltd | Financial services | 2026 |
| Advanced Netting Ltd | Manufacturing | 2010 |
| Advanced Protection Ltd | Administrative & support | 2021 |
| Aeonian Memorials Limited | Professional & scientific | 2016 |
| Aerosol Services Ltd | Administrative & support | 2006 |
| Afro-Caribbean Lift Inclusive UK CIC | Other services | 2026 |
| Agcc Contracts Limited | Construction | 2017 |
| AGE Well East Ltd | Health & social care | 2011 |
| Agincourt Autos Ltd | Wholesale & retail | 2019 |
| Agnes Cole Consulting Limited | Administrative & support | 2021 |
| Agostinho Limited | Health & social care | 2022 |
| Ahar Thidi Ltd | Hospitality | 2025 |
| AHC Carpentry Ltd | Manufacturing | 2024 |
| AI Models Limited | Education | 2025 |
| Aileah Harrison Limited | Construction | 2017 |
| Air CON Essex Limited | Energy | 2022 |
| Air-Cooled Aviation Services Limited | Transport & logistics | 2021 |
| AJ Properties 2024 Ltd | Real estate | 2024 |
| AJ Protect Ltd | Financial services | 2014 |
| Aj's and Amber Taxi Ltd | Transport & logistics | 2016 |
| AJS Automotive Ltd | Wholesale & retail | 2026 |
| AJS Property Solutions Ltd | Construction | 2023 |
| Akhvili Limited | Wholesale & retail | 2026 |