| RRB Machining Services Ltd | Administrative & support | 2006 |
| Rrdm Ltd | Professional & scientific | 2007 |
| RRS Properties Limited | Real estate | 2004 |
| RS World Ltd | Wholesale & retail | 2025 |
| RSE Beauty Ltd | Wholesale & retail | 2024 |
| Rselim Ltd | Administrative & support | 2026 |
| RSM Barker Holdings Ltd | Financial services | 2025 |
| RTT Group Ltd | Wholesale & retail | 2023 |
| Rubber & Metal Fabrications (Grays) Limited | Real estate | 1976 |
| Rubbolite Industries Limited | Extraterritorial | 1930 |
| Rudbyrn Mechanical Ltd | Construction | 2007 |
| Rufford Oaks (Ollerton) Management Company Limited | Households | 2015 |
| Ruktaj Limited | Real estate | 2007 |
| Rumble Leathers Limited | Manufacturing | 2025 |
| Run Jesee Tech Co., Ltd | Wholesale & retail | 2026 |
| Runwood Properties Limited | Real estate | 2004 |
| Ruparelia Property Solutions Ltd | Real estate | 2023 |
| Rupert Brown Freight Limited | Transport & logistics | 1990 |
| Ruprai Limited | Construction | 2006 |
| Rural City Properties Limited | Real estate | 2006 |
| Rushdi Laredo Limited | Wholesale & retail | 2025 |
| Rushmead Construction Limited | Wholesale & retail | 2003 |
| Russell Fewins Limited | Transport & logistics | 2001 |
| Russell Games Ltd. | Wholesale & retail | 2006 |
| RVR Property Investments Limited | Real estate | 2020 |
| RX Vision Ltd | Professional & scientific | 2023 |
| Ryan Construction & Management Ltd | Construction | 2014 |
| Ryder & Daly Building Services Ltd | Construction | 2019 |
| Ryedowns Limited | Health & social care | 1996 |
| Rymp Limited | Real estate | 1989 |
| Ryouvedic Ltd | Wholesale & retail | 2020 |
| Rystan Enviromental Ltd | Other services | 2018 |
| S & a Financial Contracts (UK) Limited | Professional & scientific | 2011 |
| S & K Lettings Ltd | Real estate | 2021 |
| S & K Premier Limited | Wholesale & retail | 2005 |
| S & M Reinforcement Ltd. | Construction | 2015 |
| S & P Property Perfection Ltd | Real estate | 2023 |
| S D R (G B) Limited | Wholesale & retail | 2006 |
| S G M Design Limited | Professional & scientific | 1999 |
| S Hassan Ltd | Wholesale & retail | 2025 |
| S Hogg Carpentry Limited | Construction | 2003 |
| S J Walker & Co (Essex) Ltd | Professional & scientific | 2003 |
| S K Law UK Ltd | Hospitality | 2007 |
| S Osborne Investments Ltd | Financial services | 2024 |
| S P Accounts Co. Limited | Professional & scientific | 1997 |
| S P W Fine Foods Limited | | 1987 |
| S R RAJ Engineering Services Ltd | Construction | 2005 |
| S S Meats (UK) Limited | Wholesale & retail | 1999 |
| S Supply Contracts Ltd | Other services | 2025 |
| S T GAS & Heating Limited | Construction | 2003 |
| S Wall Limited | Construction | 2006 |
| S&S Global Commerce Ltd | Wholesale & retail | 2026 |
| S. & G. Wooldridge Limited | Agriculture & fishing | 1954 |
| S. Jones Roofing, Facias & Cladding Ltd | Construction | 2024 |
| S. Shaw Limited | Other services | 2003 |
| S.A. Piper Limited | Construction | 1997 |
| S.A.A. Limited | Real estate | 1998 |
| S.A.F. Environmental Limited | Wholesale & retail | 2002 |
| S.A.R. Management Services Limited | Construction | 2005 |
| S.B. Youngs (Properties) Limited | Real estate | 1989 |
| S.C. Warner | | 2000 |
| S.D. Garner & Co Limited | Professional & scientific | 2001 |
| S.D.L. Glass & Glazing Limited | Construction | 2000 |
| S.H. Roofing Limited | Construction | 2020 |
| S.I.A. (INT) Ltd | Wholesale & retail | 2017 |
| S.J. Church & Sons Limited | Professional & scientific | 1996 |
| S.J. Glynn Contracts Limited | Construction | 1999 |
| S.J. Tinney Farming Ltd | Agriculture & fishing | 2005 |
| S.K.S. (Ilford) Limited | Wholesale & retail | 1985 |
| S.L. Doshi & Co. Limited | Professional & scientific | 2002 |
| S.M. Law Associates Ltd | Professional & scientific | 2024 |
| S.M.C. Brothers Ltd | Professional & scientific | 2017 |
| S.O. Catering Limited | Hospitality | 2004 |
| S.P. Podiatry Limited | Health & social care | 2007 |
| S.P.D. Motorsports Limited | Manufacturing | 1998 |
| S.R.J & SON Ltd | Real estate | 2024 |
| S.R.T Investment Ltd | Real estate | 2022 |
| S.S Trade (UK) Limited | Construction | 2007 |
| S.T. (Hutton) Ltd | Real estate | 2005 |
| S.T.Building Contractors Limited | Wholesale & retail | 1989 |
| S.W.B.H. Management Limited | Hospitality | 1995 |
| S.W.D. Pooke Limited | Construction | 1994 |
| SA Minall Consultants Limited | Professional & scientific | 2002 |
| SA Spice Ltd | Hospitality | 2022 |
| SAA UK Limited | Construction | 2007 |
| Saad Abbasi Ltd | Wholesale & retail | 2026 |
| SAB Essex Limited | Hospitality | 2025 |
| Sabfrancoceanwealth Ltd | Information & communication | 2007 |
| SAC Interiors Limited | Construction | 2004 |
| Sach Management Ltd | Professional & scientific | 2022 |
| Sackville Press Billericay Limited | | 1976 |
| Sadaqa Supply Ltd | Wholesale & retail | 2026 |
| Saddler Interiors Limited | Construction | 2007 |
| Sadlers Taxis (UK) Limited | Transport & logistics | 2011 |
| Saeed Outlet Ltd | Wholesale & retail | 2026 |
| Safari Traders Ltd | Wholesale & retail | 2024 |
| Safder Estates Limited | Real estate | 2016 |
| Safe Consultancy Ltd | Administrative & support | 2017 |
| Safe Harbour Childrens Homes Ltd | Health & social care | 2025 |
| Safe Today Limited | Professional & scientific | 2005 |