| S J a Woricker Ltd | Construction | 2013 |
| S J Mattock Electrical Ltd | Construction | 2024 |
| S J Rankin Consultancy Limited | Professional & scientific | 2023 |
| S J Rolfe Ltd | Professional & scientific | 2002 |
| S J T Plumbing and Heating Services Limited | Construction | 2014 |
| S J Watkins Properties Ltd | Real estate | 2025 |
| S Joslin (Builders) Limited | Construction | 1997 |
| S Kelly Farms Limited | Agriculture & fishing | 2004 |
| S M Flinders Ltd | Professional & scientific | 2020 |
| S M S (Ipswich) Limited | Administrative & support | 1993 |
| S M Welding Limited | Construction | 2014 |
| S Nair Consultancy Services Limited | Information & communication | 2024 |
| S P Cousins Joinery Limited | Manufacturing | 2002 |
| S P Scaffolding (East Anglia) Limited | Construction | 2003 |
| S P Sharman Limited | Construction | 2005 |
| S Palmer Building Services Limited | Construction | 2019 |
| S R Autos Ipswich Limited | Wholesale & retail | 2019 |
| S R Bradshaw Limited | Construction | 2007 |
| S Robinson (Plumbing & Heating) Co Ltd | Construction | 2012 |
| S S Broking Ltd | Administrative & support | 2023 |
| S Scott Electrical Limited | Administrative & support | 2008 |
| S Vinayak Limited | Real estate | 2017 |
| S W C Essex Ltd | Construction | 2015 |
| S&A Capital Ventures Ltd | Real estate | 2025 |
| S&A Finance Solution Ltd | Financial services | 2019 |
| S&I Property Rentals Ltd | Real estate | 2023 |
| S&J Coastal Construction Limited | Construction | 2019 |
| S&J Proper-T Ltd | Real estate | 2025 |
| S&L Johnson Property Investments Ltd | Real estate | 2026 |
| S&L Roofline Ltd | Construction | 2025 |
| S&R Haxell Ltd | Agriculture & fishing | 2018 |
| S&S Ipswich Sushi Limited | Hospitality | 2020 |
| S&S Property and Construction Ltd | Construction | 2026 |
| S-B-L Consultancy Ltd | Construction | 2026 |
| S-Glow Medical Limited | Health & social care | 2024 |
| S.C.A.D. Business Ltd | Construction | 2024 |
| S.Douglas Carpentry & Construction Limited | Manufacturing | 2016 |
| S.G. Woodburners & Building Services Limited | Construction | 2013 |
| S.Koleci Construction Ltd | Construction | 2018 |
| S.N. Design Ltd. | Professional & scientific | 1994 |
| S.Osborne Trucking Ltd | Transport & logistics | 2021 |
| S.R News Colchester Limited | Wholesale & retail | 2019 |
| S.S. Bdesha Properties Limited | Real estate | 2025 |
| S.T.C Carpentry Limited | Construction | 2018 |
| S.T.M. Thomas Ltd | Hospitality | 2026 |
| S6 Autocare Ltd | Construction | 2017 |
| S9 Courier Services Limited | Extraterritorial | 2020 |
| SA Investments UK Limited | Professional & scientific | 2006 |
| SA Stock Holdings Limited | Professional & scientific | 2013 |
| Saamsun Limited | Information & communication | 2022 |
| Saanvi IT Consultants Limited | Real estate | 2013 |
| Saanvi Properties Limited | Real estate | 2017 |
| Saas Sales Hub Limited | Information & communication | 2025 |
| Saat Infrastructure Limited | Construction | 2025 |
| Saayi Enterprise Ltd | Health & social care | 2025 |
| Sabini Commercial Finance Limited | Financial services | 2012 |
| Sable Tiger Limited | Real estate | 1991 |
| Sablethorn Limited | Administrative & support | 1993 |
| Sabre Building Solutions Ltd | Administrative & support | 2016 |
| Sabre Carpentry Ltd | Construction | 2017 |
| Sabre Property Holdings Ltd | Real estate | 2019 |
| Sabre Security Limited | Other services | 2025 |
| Sabresharp Limited | Construction | 1988 |
| SAC Scaffolding (Eastern) Ltd | Construction | 2014 |
| Sachi Interiors Ltd | Professional & scientific | 2020 |
| Sachihiro Digital Innovations Ltd | Professional & scientific | 2016 |
| Sacred Skin Tattoo and Piercings Limited | Other services | 2022 |
| Saddlers Rise (Watton) Management Company Limited | Real estate | 2015 |
| Sadiq Management Ltd | Real estate | 2025 |
| Sadler Cross Family Law Limited | Professional & scientific | 2020 |
| SAE Property Management Limited | Real estate | 2017 |
| Saesso Jewellery Ltd | Manufacturing | 2025 |
| Safar Primary Care Ltd | Health & social care | 2015 |
| Safar Solutions Limited | Professional & scientific | 2017 |
| Safari Childcare Billericay Limited | Education | 2024 |
| Safari Childcare Hutton Limited | Education | 2024 |
| Safari Childcare Limited | Education | 2014 |
| Safari Childcare Runwell Limited | Education | 2022 |
| Safari Club Buttsbury Limited | Education | 2024 |
| Safari Club Ingrave Limited | Education | 2024 |
| Safari Club Southgreen Limited | Education | 2024 |
| Safari Group Limited | Education | 2022 |
| Safe Rides Essex Ltd | Transport & logistics | 2023 |
| Safeaid UK England Ltd | Health & social care | 2017 |
| Safeguarding and Improvement Solutions Ltd | Health & social care | 2024 |
| Safeguarding Sphere Consultancy Limited | Professional & scientific | 2023 |
| Safelink Property Services Ltd | Construction | 2026 |
| Safenow CBT Ltd | Health & social care | 2024 |
| Safepath Environmental Limited | Water & waste | 2025 |
| Safeplay Playground Services Ltd | Other services | 2002 |
| Safeshare Global Limited | Financial services | 2015 |
| Safety and Hygiene Ltd | Wholesale & retail | 2020 |
| Safety Gb-Uk Services Ltd | Administrative & support | 2019 |
| Safety Netting (UK) Limited | Extraterritorial | 2011 |
| Safety Plan Services Ltd | Administrative & support | 2018 |
| Safewater Ltd. | Wholesale & retail | 2005 |
| Saffron Properties Ltd | Real estate | 2021 |
| Saffron Wivenhoe Ltd | Hospitality | 2024 |
| Saffronwaldenentertainments Limited | Arts & recreation | 2013 |
| Safoora & Sarah Limited | Real estate | 2026 |