| SS Grab Hire Ltd | Administrative & support | 2026 |
| SS Home Creations Ltd | Construction | 2017 |
| SS Motors Servicing & Repairs Limited | Wholesale & retail | 2025 |
| SS1 Developments Ltd | Construction | 2021 |
| SS1 Scaffolding Ltd | Construction | 2021 |
| SSA and Sons Ltd | Construction | 2019 |
| SSJ Property Investments Ltd | Construction | 2021 |
| SSJ Welding Ltd | Construction | 2023 |
| SSS (Chiller Rentals) Ltd | Administrative & support | 2021 |
| ST Andrew's Green Management Company Limited | Households | 2002 |
| ST John's Circus Management Company Limited | Households | 2016 |
| Stable Environment (Lincs) Ltd | Wholesale & retail | 2024 |
| Stable Roofs Ltd | Construction | 2023 |
| Stady Ltd | Transport & logistics | 2016 |
| Stam Consultancy Limited | Health & social care | 2011 |
| Stamford Building Contractors Ltd | Construction | 2022 |
| Stamford Occupational Therapy Services Ltd | Professional & scientific | 2016 |
| Stamford Tiling Company Limited | Construction | 2016 |
| Stamp Properties Limited | Administrative & support | 2019 |
| Stancu Services Limited | Transport & logistics | 2018 |
| Stancy Enterprises Ltd | Financial services | 2024 |
| Stand Sure Estate Ltd | Real estate | 2026 |
| Stand Sure Lettings Ltd | Real estate | 2026 |
| Stanicki Ltd | Transport & logistics | 2018 |
| Stanislaw Zych Ltd | Transport & logistics | 2012 |
| Stanley and SON Roofing Ltd | Construction | 2026 |
| Stanton Transport Ltd | Transport & logistics | 2021 |
| Star 68 Ltd | Transport & logistics | 2015 |
| Star Line Home Improvement Ltd | Construction | 2019 |
| Starbrans Healthcare Limited | Health & social care | 2022 |
| Starcana Brickwork Ltd | Manufacturing | 2025 |
| Stark Roof Co Ltd | Construction | 2025 |
| Starman Ltd | Transport & logistics | 2022 |
| Stars Hollow Property Limited | Real estate | 2025 |
| Start Building Ltd | Construction | 2020 |
| State of GIN Ltd | Manufacturing | 2023 |
| State of RUM Ltd | Manufacturing | 2023 |
| State of Tequila Ltd | Manufacturing | 2023 |
| State of Vodka Ltd | Manufacturing | 2023 |
| Statech Solutions Limited | Construction | 2011 |
| Statech UK Limited | Manufacturing | 2010 |
| Station House Publishing Limited | Information & communication | 2020 |
| Station Street Service & MOT Centre Limited | Wholesale & retail | 2017 |
| Stationone Accountants Limited | Professional & scientific | 2026 |
| Stay Spicy Ltd | Manufacturing | 2022 |
| Staywell Homes Property Group Ltd | Real estate | 2026 |
| Steadfast Assessment Ltd | Education | 2025 |
| Steadfast END Point Assessment Limited | Education | 2018 |
| Steadfast Recruitment Limited | Real estate | 2018 |
| Steadfast Training Ltd | Professional & scientific | 2005 |
| Steadwell Investment Limited | Real estate | 2025 |
| Steely Outdoors Ltd | Manufacturing | 2021 |
| Steffens Hair Limited | Other services | 2014 |
| Stefy&Any Ltd | Transport & logistics | 2019 |
| Stelgo Transport Ltd | Transport & logistics | 2010 |
| Stella Elite Properties Limited | Real estate | 2024 |
| Stella's Cakes Limited | Wholesale & retail | 2025 |
| Stemgineering With Nick Ltd | Education | 2024 |
| Stenult Farm Ltd | Wholesale & retail | 2025 |
| Stephanie Elswood Ltd | Financial services | 2025 |
| Stephen Murray Consulting Limited | Professional & scientific | 2017 |
| Stephens Communications Ltd | Construction | 2023 |
| Steve Bentzen Limited | Information & communication | 2002 |
| Steve Cousins Carpentry Limited | Construction | 2003 |
| Steve Griggs Plumbing & Heating Ltd | Construction | 2016 |
| Steve Smith Kitchens & Carpentry Services Ltd | Construction | 2017 |
| Steve Walker Driving Services (Spalding) Ltd | Construction | 2013 |
| Steven Bull Limited | Wholesale & retail | 2009 |
| Stewart Builders Ltd | Construction | 2025 |
| Stimson Electrical Solutions Ltd | Professional & scientific | 2023 |
| STK Holdings Limited | Financial services | 2016 |
| Stone Asbestos Ltd | Professional & scientific | 2012 |
| Stone Hands Projects and Consultancy Ltd | Professional & scientific | 2021 |
| Stonegate Carpentry Ltd | Manufacturing | 2024 |
| Stonehaven Home Improvements Ltd | Construction | 2026 |
| Stonetech Paving & Landscaping Ltd | Administrative & support | 2022 |
| Stonetech Paving Ltd | Construction | 2021 |
| Stoneware Studios Ltd | Manufacturing | 2026 |
| Stonewright Limited | Construction | 2001 |
| Stoney Street Developments Limited | Real estate | 1999 |
| Storm Guard Roofing & Building Ltd | Construction | 2023 |
| Stormguard Roofing and Building (Herts) Ltd | Construction | 2023 |
| Stormproof Roofing (Cambs) Ltd | Construction | 2024 |
| Storypositive Ltd | Information & communication | 2019 |
| Stow Lane (Walsoken) Management Company Limited | Administrative & support | 2026 |
| STP Rentals Lincs Ltd | Real estate | 2012 |
| Strategic Flow Ltd | Information & communication | 2025 |
| Stratton Property Developments Ltd | Construction | 2023 |
| Straw Supply Services Limited | Wholesale & retail | 2018 |
| Strawberry Fields Management Company Limited | Households | 2002 |
| Streamline Contracting Limited | Construction | 2010 |
| Streets Details Ltd | Wholesale & retail | 2026 |
| Stress Free Expo Ltd | Other services | 2023 |
| Strides (Norfolk) Ltd | Health & social care | 2023 |
| Stronger Together Community Support CIC | Administrative & support | 2025 |
| Stuart Alan Signs Limited | Professional & scientific | 2017 |
| Stuart Gilbert Plumbing and Heating Services Limited | Construction | 2011 |
| Stuart Murray Ltd | Professional & scientific | 2022 |
| Studio Haku Ltd | Arts & recreation | 2025 |
| Studio Knowhere Ltd | Information & communication | 2020 |