| 778 Construction Ltd | Construction | 2019 |
| Artes Erunt Limited | Professional & scientific | 2005 |
| Baze Skills Training Ltd | Education | 2019 |
| Cambrian Waste 2 Energy Ltd | Water & waste | 2012 |
| Carew Capital Ltd | Financial services | 2025 |
| Cortana AI Limited | Information & communication | 2026 |
| Hephzibah Community Resources Ltd | Other services | 2016 |
| Ironwood Construction Ltd | Construction | 2013 |
| Johnston Trenchless Solutions Ltd | Administrative & support | 2010 |
| Joseph Gallagher Group Limited | Construction | 1999 |
| Joseph Gallagher Limited | Construction | 1982 |
| Land Queries Limited | Water & waste | 2017 |
| London Fire Door Consultancy Services Ltd | Professional & scientific | 2025 |
| M R Services (Essex) Limited | Other services | 2005 |
| MA Media Ltd | Professional & scientific | 2024 |
| Marbro Tunnelling Services Limited | Construction | 2017 |
| Maxemil Limited | Administrative & support | 2006 |
| Metropolitan Waste Management (Orsett) Limited | Real estate | 2007 |
| N.R.C. Plant Limited | Administrative & support | 1997 |
| Notsallow 187 Limited | Real estate | 2003 |
| Orsett House Management Company Limited | Extraterritorial | 2001 |
| Orsett Masonic Hall Limited | Other services | 1963 |
| Recycled in England Limited | Water & waste | 2013 |
| Recycled in Orsett Limited | Mining & quarrying | 2007 |
| Ro-Tech Infinity Consultancy Ltd | Information & communication | 2014 |
| Sigma Studies Ltd | Education | 2001 |
| Sigma Studies Training Limited | Education | 2004 |
| Skyline Site Safety Supplies Ltd | Wholesale & retail | 2020 |
| Specialist Plant Associates Limited | Construction | 1988 |
| Square Ceilings Ltd | Construction | 2010 |
| Street Fuel Trading Limited | Water & waste | 2011 |
| THE FOX PUB Orsett Limited | Hospitality | 2025 |
| Tranquil Fabrication Technologies Ltd | Construction | 2018 |
| W.J.Curley & Sons Limited | Water & waste | 1960 |