| SPM EPC and Electrical Compliance Ltd | Manufacturing | 2025 |
| Sponsor OUR Team Limited | Information & communication | 2024 |
| SRI Nivin Enterprises Ltd | Wholesale & retail | 2019 |
| SRI PGS Limited | Wholesale & retail | 2023 |
| SRS Properties Stamford Ltd | Extraterritorial | 2013 |
| ST Gilbert's Church of England Primary School | Education | 2012 |
| ST Martin's Park Limited | Real estate | 2020 |
| ST Peters Court (Freehold) Limited | Real estate | 2002 |
| ST Peters Court (Leasehold) Limited | Real estate | 2002 |
| ST. Martins Antiques (Stamford) Limited | Wholesale & retail | 2015 |
| ST. Peter's House (Stamford) Management Company Limited | Administrative & support | 1992 |
| St.Giles House Hotel Ltd | Hospitality | 2024 |
| Stables Court Management Company Limited | Households | 1990 |
| Stack Accounting Limited | Professional & scientific | 2023 |
| Stackberry Limited | Information & communication | 2020 |
| Stag Ecology Services Ltd | Professional & scientific | 2011 |
| Staithe Consulting Limited | Professional & scientific | 2024 |
| Stamford & Rutland Pressure Washing Ltd | Administrative & support | 2020 |
| Stamford 101 Ltd | Real estate | 2018 |
| Stamford Academy Limited | Education | 2005 |
| Stamford and Rutland Garden Maintenance Ltd | Administrative & support | 2024 |
| Stamford Architectural Design Limited | Professional & scientific | 2022 |
| Stamford Association Football Club Limited | Arts & recreation | 1948 |
| Stamford Auction Rooms Limited | Wholesale & retail | 2017 |
| Stamford Bathrooms & Plumbing Limited | Construction | 2022 |
| Stamford Bathrooms Limited | Wholesale & retail | 1999 |
| Stamford Bespoke Joinery Ltd | Construction | 2019 |
| Stamford Bespoke Kitchens Ltd | Construction | 2020 |
| Stamford Bespoke Windows & Doors Ltd | Construction | 2020 |
| Stamford Boiler Services Limited | Construction | 2024 |
| Stamford Bookkeeping Ltd | Professional & scientific | 2013 |
| Stamford Coffee Limited | Manufacturing | 2025 |
| Stamford Companies Limited | Construction | 2018 |
| Stamford Consulting Limited | Professional & scientific | 2023 |
| Stamford Contemporary Arts Ltd | Wholesale & retail | 2019 |
| Stamford Corn Exchange Company Limited | Real estate | 1925 |
| Stamford Country Lounge Ltd | Hospitality | 2023 |
| Stamford Cuemakers Ltd | Arts & recreation | 2017 |
| Stamford Digital Limited | Information & communication | 2018 |
| Stamford Diversity Group CIC | Other services | 2022 |
| Stamford Electrical Services Limited | Construction | 2011 |
| Stamford Endowed Schools Enterprises Limited | Education | 1991 |
| Stamford Endowed Schools Trustee Limited | Education | 2010 |
| Stamford Hardscapes Ltd | Construction | 2023 |
| Stamford High Street Development Company Limited | Construction | 2021 |
| Stamford Holiday Ltd | Hospitality | 2024 |
| Stamford Home Services Ltd | Information & communication | 2024 |
| Stamford Independent Travel Limited | Administrative & support | 2009 |
| Stamford Juice Company Limited | Information & communication | 2002 |
| Stamford Landscapes Limited | Administrative & support | 2022 |
| Stamford Masonic Centre Limited | Extraterritorial | 2015 |
| Stamford Masonic Centre Members Club Limited | Other services | 2026 |
| Stamford Masonry Services Ltd | Construction | 2017 |
| Stamford Medical Aesthetics Ltd | Other services | 2022 |
| Stamford North LLP | | 2025 |
| Stamford Osteopathic Clinic Limited | Health & social care | 2025 |
| Stamford Photo Express Limited | Professional & scientific | 2017 |
| Stamford Photo Services Ltd | Professional & scientific | 2025 |
| Stamford Physiotherapy Ltd | Health & social care | 2023 |
| Stamford Portrait Studio Limited | Professional & scientific | 2017 |
| Stamford Power Limited | Professional & scientific | 2026 |
| Stamford Power Systems Limited | Manufacturing | 1993 |
| Stamford Property and Investments Limited | Other services | 2016 |
| Stamford Property Enterprises Ltd | Real estate | 2024 |
| Stamford Property Maintenance - Electrical Ltd | Construction | 2024 |
| Stamford Property Maintenance Ltd | Construction | 2023 |
| Stamford Property Solutions Ltd | Real estate | 2016 |
| Stamford Radiators Limited | Construction | 2021 |
| Stamford RAW Ltd | Wholesale & retail | 2022 |
| Stamford Real Estate Ltd | Real estate | 2019 |
| Stamford Removals Limited | Transport & logistics | 2025 |
| Stamford Retail Solutions Limited | Information & communication | 2008 |
| Stamford Risk Management Group Ltd | Professional & scientific | 2024 |
| Stamford Shakespeare Company | Arts & recreation | 1977 |
| Stamford Sights and Secrets Ltd | Administrative & support | 2019 |
| Stamford Software Limited | Information & communication | 2008 |
| Stamford Spaces Limited | Real estate | 2025 |
| Stamford Stays Limited | Real estate | 2017 |
| Stamford Stoves Limited | Construction | 2017 |
| Stamford Strings Limited | Manufacturing | 2019 |
| Stamford Studios Ltd | Arts & recreation | 2018 |
| Stamford Sweets Ltd | Wholesale & retail | 2026 |
| Stamford Timber Creations Ltd | Construction | 2024 |
| Stamford Time & Co Ltd | Other services | 2025 |
| Stamford Tools Ltd | Manufacturing | 2015 |
| Stamford Tractors Limited | Extraterritorial | 1995 |
| Stamford Vehicle Hire Limited | Administrative & support | 2009 |
| Stamfordsaunaco Limited | Health & social care | 2025 |
| Stand Agency Limited | Professional & scientific | 2010 |
| Stand Holdings Ltd | Financial services | 2023 |
| Stapleton & SON Solicitors Limited | Professional & scientific | 2019 |
| Steel Landscaping Co Ltd | Other services | 2019 |
| Steel Landscaping Edging Ltd | Extraterritorial | 2020 |
| Steel Landscaping Products Limited | Manufacturing | 2023 |
| Steel Peaks Ltd | Construction | 2014 |
| Steele's Yard Management Company Limited | Households | 2005 |
| Steelscaping Co Limited | Extraterritorial | 2022 |
| Steve Maxwell Consulting Ltd | Professional & scientific | 2025 |
| Steve Rudkin Electrical Contractors Limited | Construction | 2004 |
| Stewart Murray Engineering Consultancy Limited | Professional & scientific | 2025 |