| Smile Community C.I.C. | Health & social care | 2020 |
| Smile Enterprises Ltd | Administrative & support | 2022 |
| Smile Holdings Specialists Limited | Real estate | 2020 |
| Smile Orthodontics Holdings Limited | Administrative & support | 2016 |
| Smile Smart Limited | Administrative & support | 2017 |
| Smiles Care Limited | Education | 2018 |
| Smiles Property Limited | Real estate | 2026 |
| Smillie Burrage Adventures Limited | Financial services | 2023 |
| Smit & Smit Ltd | Real estate | 2025 |
| Smith & Bloom Limited | Construction | 2006 |
| Smith & Pinching Financial Services Limited | Financial services | 1998 |
| Smith of Honingham (Developments) Limited | Construction | 2013 |
| Smith of Honingham (Properties) Limited | Real estate | 2013 |
| Smith Property Blue Ltd | Construction | 2026 |
| Smith Removals Ltd | Transport & logistics | 2020 |
| Smith Services Property Ltd | Real estate | 2025 |
| Smith's Elite Driving Limited | Transport & logistics | 2025 |
| Smiths CBC EA Ltd | Wholesale & retail | 2023 |
| Smiths Garage Ltd | Wholesale & retail | 2016 |
| Smiths Home Improvements Ltd | Construction | 2013 |
| Smiths Mechanical Support Limited | Wholesale & retail | 2021 |
| Smithson Carpentry Services Limited | Construction | 2002 |
| Smithson Property Ltd | Real estate | 2022 |
| SMJD11 Limited | Information & communication | 2018 |
| Smked Ltd | Hospitality | 2020 |
| SML (East Anglia) Ltd | Construction | 2012 |
| Smoca Ltd | Wholesale & retail | 2017 |
| Smoca Properties Ltd | Construction | 2025 |
| Smoke & Wildwood Limited | Hospitality | 2023 |
| Smokey C'S Ltd | Construction | 2024 |
| Smoking GUN Mystery Books Ltd | Information & communication | 2013 |
| Smooth Electrical Ltd | Administrative & support | 2019 |
| SMP (Merchants) Ltd | Wholesale & retail | 2024 |
| SMP Faib Limited | Other services | 2013 |
| Smra Properties Ltd | Real estate | 2025 |
| Smrt Medical Limited | Manufacturing | 2021 |
| SMS Property Rental Ltd | Real estate | 2016 |
| SMS Services (Norfolk) Limited | Administrative & support | 2012 |
| SMS Studios Ltd | Information & communication | 2025 |
| SMT Motors (Hoveton) Ltd | Wholesale & retail | 2016 |
| Smudge IFA Support Limited | Professional & scientific | 2022 |
| Smylee Pets Limited | Wholesale & retail | 2000 |
| Smylyx Ltd | Professional & scientific | 2016 |
| SN Plumbing and Heating Norfolk Ltd | Construction | 2017 |
| SNA Midlands Ltd | Wholesale & retail | 2019 |
| Snack Creations Ltd | Manufacturing | 2018 |
| Snah Smile Ltd | Health & social care | 2023 |
| Snap Cuts Limited | Other services | 2018 |
| Snap IT Limited | Information & communication | 2018 |
| Snapgrade Limited | Information & communication | 2017 |
| Snappy Snaps Kings Lynn Ltd | Wholesale & retail | 2015 |
| Snbx Events Ltd | Arts & recreation | 2026 |
| Sneaker Refresh Ltd | Administrative & support | 2025 |
| Snehithan Private Limited | Households | 2025 |
| Snelgrove Survey Ltd | Construction | 2024 |
| Snelling Business Systems Limited | Manufacturing | 2004 |
| Snellings Limited | Professional & scientific | 2011 |
| Snetterton Commercial Hub Limited | Construction | 2023 |
| Snetterton East Limited | Energy | 2024 |
| Snetterton Utilities Limited | Energy | 2022 |
| SNF Holdings Limited | Financial services | 2026 |
| Snoop Boutique Limited | Wholesale & retail | 2024 |
| Snow Hill Snooker Club Ltd | Arts & recreation | 2016 |
| Snowdonia Electrical Supplies Ltd. | Wholesale & retail | 2018 |
| Snowfit Limited | Wholesale & retail | 1998 |
| Snowley Cleaning Services Ltd | Administrative & support | 2021 |
| Snowy and Walker Ltd | Real estate | 2019 |
| Snrg Healthcare Limited | Health & social care | 2013 |
| SNS Dermatology and Skin Cancer Services Limited | Health & social care | 2019 |
| Snta Ltd | Hospitality | 2025 |
| Snug Acle Ltd | Hospitality | 2024 |
| Snug Art Cafe Ltd | Hospitality | 2013 |
| Snug Attleborough Ltd | Hospitality | 2024 |
| Snug Corton Ltd | Hospitality | 2026 |
| Snug Gressenhall Ltd | Hospitality | 2024 |
| Snug Harpley Ltd | Hospitality | 2025 |
| Snug Hospitality Group Ltd | Financial services | 2024 |
| Snug Norwich NR2 Ltd | Hospitality | 2025 |
| Snug Old Catton Ltd | Hospitality | 2025 |
| Snug Pubs & Inns Ltd | Financial services | 2021 |
| Snug South Wootton Ltd | Hospitality | 2025 |
| Snug Stays Property Management Ltd | Administrative & support | 2024 |
| Snug Thurlton Ltd | Hospitality | 2024 |
| SNW Property Investments Ltd | Real estate | 2022 |
| Snwc Ltd | Construction | 2004 |
| SO Schools OUT Limited | Health & social care | 2011 |
| So-Can Services Limited | Information & communication | 2019 |
| Soak Digital Ltd | Information & communication | 2009 |
| Soak Floatation Ltd | Health & social care | 2019 |
| Soak Investments Limited | Extraterritorial | 2014 |
| Soanes Fire Ltd | Manufacturing | 2024 |
| Soarin Limited | Construction | 2006 |
| Soceanu Construction Ltd | Construction | 2013 |
| Social Captured Ltd | Information & communication | 2022 |
| Social Care Enterprises Limited | Information & communication | 2010 |
| Social Strategies for Health Limited | Health & social care | 2019 |
| Social Switchup Ltd | Professional & scientific | 2024 |
| Socialifedk Media Ltd | Manufacturing | 2023 |
| Socialist Studies Ltd | Information & communication | 2025 |
| Society Alive CIC | Other services | 2021 |