| "Shalynn" the Friendly Cattery Ltd | Other services | 2007 |
| 13 Satanita Road RTM Company Limited | Households | 2010 |
| 137-139 Ferry Road Residents Limited | Households | 2017 |
| 22 Barbers Limited | Other services | 2024 |
| 22 Seaforth Road RTM Company Ltd | Households | 2016 |
| 24 and 24A Cossington Road Westcliff Freehold Company Limited | Real estate | 2022 |
| 24 Build Limited | Construction | 2019 |
| 24 Milton Road Limited | Households | 2016 |
| 24/SEVERN Management (Langstone) Limited | Real estate | 2005 |
| 25HAIR Limited | Other services | 2020 |
| 29660 Limited | Construction | 2021 |
| 2LIVEPROPERTIES Ltd | Real estate | 2020 |
| 34 Walton Street Company Limited | Households | 2004 |
| 3AR Trading Ltd | Wholesale & retail | 2022 |
| 401 Cyber Security Limited | Administrative & support | 2015 |
| 45 the Mall Commercial Limited | Administrative & support | 2023 |
| 45 the Mall Limited | Real estate | 2019 |
| 46 Kirkdale Property Management Company Limited | Households | 2005 |
| 7 Fire Protection Services Limited | Manufacturing | 2016 |
| 7C'S Transport Services Limited | Transport & logistics | 2017 |
| 88FIRST Ltd | Construction | 2023 |
| 91 Management Ltd | Real estate | 2025 |
| 99GIANTS Ltd | Information & communication | 2025 |
| A & H Investment Services Limited | Real estate | 2019 |
| A & H Pharmacies Limited | Wholesale & retail | 2004 |
| A 1 FIX Limited | Construction | 2019 |
| A C Hotel and Apartments Limited | Hospitality | 2022 |
| A Cristal Clean Ltd | Administrative & support | 2012 |
| A D Hawes Consultancy Ltd | Construction | 2010 |
| A M COX Builders Limited | Construction | 2018 |
| A N Smith Roofing Co Limited | Construction | 2010 |
| A P Direct Limited | Construction | 2005 |
| A Page for YOU Ltd | Information & communication | 2025 |
| A&C Structures Limited | Construction | 2026 |
| A.J.Lockwood Limited | Information & communication | 2024 |
| A.J.S. Scaffolding Services Limited | Construction | 2000 |
| A.S. West Ltd | Construction | 2008 |
| Aaron LEE Home Improvements Ltd | Construction | 2025 |
| ABF Commerce Group Ltd | Wholesale & retail | 2024 |
| ABF Liquidations Ltd | Wholesale & retail | 2025 |
| Able Construction Contracts Ltd | Construction | 2014 |
| Able Pipework Services Limited | Construction | 2006 |
| Acacia MAY Consulting Limited | Professional & scientific | 2019 |
| Ace IT Relocation Ltd | Transport & logistics | 2010 |
| Acecore Ltd | Administrative & support | 2026 |
| Acentrixia Ltd | Wholesale & retail | 2024 |
| Active Cargo Services Limited | Transport & logistics | 1986 |
| Active Chartering Limited | Transport & logistics | 1981 |
| Adam & Sons Limited | Financial services | 2006 |
| Adam Bentley Antiques Limited | Wholesale & retail | 2023 |
| Adam Bentley Restorations Limited | Other services | 2023 |
| Adam Calvert Bentley Ltd. | Wholesale & retail | 2014 |
| Adam Prescott Photography Ltd | Information & communication | 2018 |
| Adams Steel Erectors Limited | Construction | 2014 |
| Advance Mortgage & Protection Advisers Limited | Financial services | 2024 |
| Advanced Engine Research Limited | Information & communication | 1998 |
| Advanced Operations Management Limited | Professional & scientific | 2017 |
| Adventure Quest Motorhomes LP | | 2017 |
| AEC Estate Consultants Limited | Extraterritorial | 2026 |
| Aegis Sentinel Limited | Information & communication | 2026 |
| Affordable Windows UK Ltd | Construction | 2020 |
| AG & AG Medical Limited | Health & social care | 2021 |
| AG Orthopaedics Limited | Health & social care | 2010 |
| Agilier Limited | Information & communication | 2002 |
| AH Control Ltd | Professional & scientific | 2022 |
| AHL Plastering & Rendering Limited | Construction | 2022 |
| AIM Search & Selection Limited | Other services | 2022 |
| Air Conditioning Essex Ltd | Construction | 2023 |
| Aitis Ltd | Information & communication | 2019 |
| AJ Chambers Recruitment Ltd | Administrative & support | 2010 |
| AJ Gull Electrical Services Ltd | Construction | 2016 |
| AJB Aerospace Ltd | Transport & logistics | 2011 |
| AJC Hygiene & Therapy Ltd | Health & social care | 2014 |
| Akanelewd Limited | Wholesale & retail | 2025 |
| Alan Thurlow Consulting Limited | Administrative & support | 2009 |
| Alanson Consulting Limited | Construction | 2000 |
| Alco Systems Limited | Other services | 2020 |
| Alcor Lspv Ltd | Energy | 2013 |
| Alexandra Abrams Limited | Professional & scientific | 2023 |
| Alexiam Materials Consulting Limited | Mining & quarrying | 2015 |
| Aligned Horizons Ltd | Financial services | 2024 |
| Aliosc Limited | Information & communication | 2014 |
| ALL Square Carpentry Ltd | Manufacturing | 2025 |
| ALL Terrain Mobility Limited | Wholesale & retail | 2008 |
| Allegro Limited | Real estate | 1985 |
| Allen Clark Investments Limited | Financial services | 2023 |
| Allen Clark Properties Limited | Real estate | 2020 |
| Alliance PAY Ltd | Administrative & support | 2024 |
| Allnutt Parker Financial Services Ltd | Wholesale & retail | 2003 |
| Allround Plastering Ltd | Construction | 2017 |
| Allsort Grab Services Ltd | Construction | 2018 |
| Alpha Maintenance Limited | Construction | 2024 |
| Alpha Seed Ventures Ltd | Real estate | 2024 |
| Alphaspec Limited | Professional & scientific | 2014 |
| Altex Double Glazing Doctor Limited | Construction | 2023 |
| Altex Industrial Holdings Limited | Financial services | 2013 |
| Altos Living Space Ltd | Construction | 2023 |
| Ambercrombie Associates Ltd | Construction | 2025 |
| AMS Tanning Ltd | Wholesale & retail | 2009 |
| Andaco Services Limited | Administrative & support | 2026 |