| ST Consulting (London) Ltd | Construction | 2022 |
| ST Consumables Limited | Wholesale & retail | 2013 |
| ST Cuthberts House Right to Manage Company Limited | Households | 2021 |
| ST CYR Merchandising Limited | Wholesale & retail | 2019 |
| ST Edmund's Park Estate Management Limited | Real estate | 2020 |
| ST Etheldreda Art Studio | Arts & recreation | 1989 |
| ST Giles 1842 Group Limited | Financial services | 2024 |
| ST Giles Park (Cringleford) Management Company Limited | Real estate | 2021 |
| ST Helens Consulting Ltd | Other services | 2018 |
| ST J'S PE Providers Ltd | Education | 2025 |
| ST James' Construction Limited | Construction | 2016 |
| ST James' Meadow Limited | Real estate | 2003 |
| ST John the Baptist Catholic Multi Academy Trust | Education | 2012 |
| ST John's Gardens Management Co Ltd | Real estate | 2006 |
| ST Johns House Holdings Ltd | Health & social care | 2021 |
| ST Johns Way Ltd | Real estate | 2023 |
| ST Just Limited | Hospitality | 2013 |
| ST Lawrence Developments Ltd | Construction | 2016 |
| ST Martins Energy Centre Limited | Energy | 2023 |
| ST Martins Housing Trust | Health & social care | 1989 |
| ST Mary's Road Limited | Real estate | 2021 |
| ST Marys Developments (Norfolk) Limited | Real estate | 2022 |
| ST Michaels Gate Estate Management (Hopton) Limited | Households | 2022 |
| ST Neots Turkish Restaurant Limited | Hospitality | 2018 |
| ST Nicholas Place (Sheringham) Management Company Limited | Real estate | 2005 |
| ST Peters Chase Management Company Limited | Households | 2025 |
| ST Rugman Farm Services Limited | Administrative & support | 2016 |
| ST Stephens Pavilion Management Company Limited | Households | 2004 |
| ST Stephens Terrace Management Company Limited | Real estate | 2006 |
| ST Thomas Norwich Trust Limited | Health & social care | 2003 |
| ST. Barnabas Counselling Centre | Health & social care | 1990 |
| ST. Bartholomews Court Residents Association Limited | Households | 1982 |
| ST. Catherine's Real Estate Ltd | Real estate | 2021 |
| ST. Edmund's Wharf Management Company Limited | Households | 2002 |
| ST. Edmunds Finance Limited | Financial services | 1992 |
| ST. George Management Company Limited | Households | 2003 |
| ST. George Software Solutions Ltd | Information & communication | 2010 |
| ST. Luke's Investments Ltd. | Real estate | 1993 |
| ST. Margaret's Court Residents Association Limited | Households | 1981 |
| ST. Martin's Property Developments Limited | Construction | 2013 |
| ST. Mary's Court Residents Association Limited | Real estate | 1976 |
| ST. Marys Maltings Management Company (NO.2) Limited | Households | 2012 |
| ST. Michael's Apartments Management Limited | Households | 2015 |
| ST. Pierre Consultancy Ltd | Professional & scientific | 2020 |
| ST. Saviours Investment & Management Limited | Real estate | 2014 |
| ST. Thomas Trading Company Limited | Wholesale & retail | 2005 |
| St.Flo Ltd | Hospitality | 2019 |
| St.Mary's Restaurant Limited | Hospitality | 2014 |
| Stable Dwellings Limited | Real estate | 2016 |
| Stackhire Ltd | Administrative & support | 2023 |
| Stackyard Estates Ltd | Construction | 2016 |
| Stacyluxecrafts Ltd | Wholesale & retail | 2024 |
| Stadering Limited | Real estate | 2017 |
| Stafford Aero Technologies Limited | Manufacturing | 2000 |
| Stafford of Strumpshaw Limited | Professional & scientific | 1987 |
| Stafford Property Ltd | Real estate | 2022 |
| Stafford Stores & P.O. Limited | Wholesale & retail | 2022 |
| Stafford Stores II Limited | Wholesale & retail | 2024 |
| Staffordshire Foods Ltd | Hospitality | 2020 |
| Stag Machinery Ltd | Wholesale & retail | 2020 |
| Stage&Screen Limited | Information & communication | 2013 |
| Stagforce Limited | Construction | 2023 |
| Stagnant Ltd | Information & communication | 2013 |
| Staige Homes Ltd | Real estate | 2025 |
| Stainless Finishing Solutions Ltd. | Wholesale & retail | 2006 |
| Staithe & Partners Limited | Administrative & support | 2026 |
| Stalham Engineering Co Limited | Wholesale & retail | 1963 |
| Stalham Moorings Limited | Administrative & support | 1963 |
| Stalham Radio Limited | Real estate | 1961 |
| Stalham Staithe Marina Limited | Transport & logistics | 2025 |
| Stamford Country Inns Limited | Hospitality | 2014 |
| Stamford Engineering Limited | Administrative & support | 2010 |
| Stamford Renewable Power Limited | Energy | 2016 |
| Stamp Capital Limited | Transport & logistics | 2017 |
| Stamp Corner Limited | Wholesale & retail | 2021 |
| Stanalog Limited | Information & communication | 2024 |
| Stanciu Construction Ltd | Construction | 2016 |
| Stanclo Ltd | Real estate | 2026 |
| Stand Trading Limited | Manufacturing | 1996 |
| Stanford Court Properties Limited | Real estate | 2014 |
| Stanham Construction Services Ltd | Construction | 2010 |
| Stanley Road Investments Limited | Real estate | 2022 |
| Stanley Tithe Limited | Professional & scientific | 2007 |
| Stanley Trett Management Company Limited | Households | 2022 |
| Stannary Brewing Company Ltd. | Manufacturing | 2015 |
| Stantower Limited | Real estate | 1987 |
| Stanway Healthcare Ltd | Health & social care | 2013 |
| Stanwyck Fish Bar Limited | Hospitality | 2015 |
| Star Children C.I.C. | Education | 2026 |
| Star Fish Bar Limited | Hospitality | 2017 |
| Star Sheep Enterprises Ltd | Professional & scientific | 2023 |
| Star Twofold Ltd | Construction | 2012 |
| Starboard 77 Ltd | Real estate | 2023 |
| Starboard Properties Ltd | Real estate | 2025 |
| Starboard Systems Limited | Information & communication | 2016 |
| Starboy Sports Group One Limited | Arts & recreation | 2023 |
| Starcrown Systems Limited | Hospitality | 2005 |
| Stardust Structures Limited | Construction | 2016 |
| Stark Comms Limited | Professional & scientific | 2021 |
| Starker Solutions Ltd | Information & communication | 2025 |