| Sutton Hose Limited | Manufacturing | 2019 |
| Sutton Select Investments Limited | Real estate | 2018 |
| SV Roofing Ltd | Construction | 2022 |
| SVS BBQ Ltd | Hospitality | 2025 |
| SW Consultancy Ltd | Professional & scientific | 2023 |
| SW Decorators Ltd | Construction | 2019 |
| Swanky Pants Leggings Ltd | Wholesale & retail | 2025 |
| Swanland Ltd | Construction | 2017 |
| Swan’S Nest Limited | Professional & scientific | 2022 |
| Swarkestone Developments Limited | Construction | 2003 |
| Swedx UK Ltd | Manufacturing | 2019 |
| Sweet Corner @ the Village Teapot Ltd | Hospitality | 2026 |
| Sweet Gifts Group Ltd | Manufacturing | 2015 |
| Sweet Sensations Desserts Ltd | Hospitality | 2025 |
| Sweetlyvegan Protocol Ltd | Manufacturing | 2025 |
| Sweets’N Treats Galore Ltd | Wholesale & retail | 2023 |
| SWG Properties Limited | Households | 2021 |
| Swinstead Enterprises Limited | Construction | 2012 |
| Swoon Hair Limited | Other services | 2025 |
| Sycamore Construction Consultants Limited | Professional & scientific | 2019 |
| Sygnitech Ltd | Information & communication | 2019 |
| Sylvan Enterprises of Sherwood Forest Limited | Manufacturing | 1995 |
| Symbolics Domains Ltd | Wholesale & retail | 2018 |
| Symm Services Ltd | Transport & logistics | 2023 |
| Syncchain Consultancy Ltd | Professional & scientific | 2025 |
| Synergetix Limited | Manufacturing | 2009 |
| Synergy Autocentres Holdings Ltd | Financial services | 2024 |
| Syson Limited | Health & social care | 2022 |
| SYUNIT1-3 Ltd | Real estate | 2025 |
| T & J Holdings Ltd | Professional & scientific | 2023 |
| T & L Gibbons Properties Ltd | Real estate | 2025 |
| T & M Sporting Promotions Limited | Real estate | 2008 |
| T & T Design Ltd | Wholesale & retail | 2022 |
| T 4 Design Limited | Manufacturing | 1998 |
| T a Scanlon Services Limited | Financial services | 2014 |
| T Clay Ceramics and Building Contractors Limited | Construction | 2017 |
| T Hooper Ltd | Construction | 2015 |
| T M Simmons & Co Limited | Professional & scientific | 2001 |
| T S Crump Ltd. | Construction | 2016 |
| T S RAI Limited | Wholesale & retail | 2017 |
| T W Brand of Wooler Limited | Wholesale & retail | 2019 |
| T&D SAI Limited | Education | 2025 |
| T&Dcapital Ltd | Real estate | 2026 |
| T&J Developments Mansfield Ltd | Construction | 2025 |
| T&M Hayes Ltd | Wholesale & retail | 2022 |
| T&M Railway Fencing Limited | Construction | 2015 |
| T&S Bouncy Castle Hire Limited | Administrative & support | 2025 |
| T&T Timber Ltd | Wholesale & retail | 2025 |
| T. Allen Alloys Ltd | Manufacturing | 2021 |
| T. Allen Stockholders Limited | Wholesale & retail | 1993 |
| T.C. Fabrications (Ripley) Ltd. | Manufacturing | 1993 |
| T.E.A.M Education Trust | Education | 2019 |
| T.J. Mcgovern Painting Contractors Limited | Construction | 2004 |
| T.M.M. & Building Limited | Construction | 2005 |
| T.Michael Properties Limited | Real estate | 2024 |
| T2L Care Ltd | Health & social care | 2025 |
| T@N Ltd | Hospitality | 2022 |
| Tackled UP Products Ltd | Wholesale & retail | 2024 |
| TAJ Electrical Services Limited | Professional & scientific | 2023 |
| Takhar Investments Limited | Real estate | 2006 |
| Talent Hub 360 Limited | Administrative & support | 2023 |
| Tallod Private Limited | Administrative & support | 2016 |
| Tallyup (AI) Ltd | Information & communication | 2025 |
| Tamara Lloyd T/A Tyre Junction Ltd | Wholesale & retail | 2019 |
| Tanbry Construction Limited | Construction | 1994 |
| Tania Wealth Management Ltd | Financial services | 2018 |
| Tanioszka Shop Ltd | Wholesale & retail | 2018 |
| Tanning Mansfield Ltd | Administrative & support | 2025 |
| Tanzanite Agro Import & Export Ltd | Wholesale & retail | 2019 |
| Tapton Developments Ltd | Construction | 2026 |
| Tarantus Ltd | Transport & logistics | 2023 |
| Target 1 CIC | Health & social care | 2023 |
| Target Telecoms Limited | Information & communication | 2012 |
| Tarr Rail Ltd | Construction | 2024 |
| Taryn Hall Recruitment Limited | Administrative & support | 2022 |
| Tasd Limited | Wholesale & retail | 2021 |
| Tasteless Water Limited | Manufacturing | 2024 |
| Tattershall Riverview Lodges Ltd | Hospitality | 2020 |
| Taurus Driving Solutions Limited | Transport & logistics | 2017 |
| Taxi Ongi Etorri Limited | Transport & logistics | 2025 |
| Taylor 7 Limited | Administrative & support | 2012 |
| Taylor Martin Ltd | Professional & scientific | 2011 |
| Taylormac Management Ltd | Construction | 2023 |
| Taylormade Property Developments (UK) Limited | Construction | 2009 |
| TCC Transport Ltd | Transport & logistics | 2019 |
| TCG Housing Limited | Real estate | 2025 |
| Tcgallstarz Ltd | Wholesale & retail | 2026 |
| TCP (GB) Audit LLP | | 2010 |
| TCP (GB) Group Ltd | Financial services | 2010 |
| TCP (GB) LLP | | 2005 |
| TDP Invertebrate Surveyors and Consultants Ltd | Professional & scientific | 2010 |
| Teal Growth Limited | Professional & scientific | 2022 |
| Tebbett Heating Solutions Limited | Construction | 2018 |
| Tebo Homes Ltd | Construction | 2024 |
| Tecdry R&D Limited | Manufacturing | 2015 |
| Tecdry UK Limited | Manufacturing | 2014 |
| Tech Service Partner Limited | Information & communication | 2013 |
| Tech-Wright UK Ltd | Manufacturing | 2014 |
| Techchange Ltd | Information & communication | 2025 |
| Techcon Solutions Limited | Construction | 2022 |