| Swanmode Software Consultants Limited | Information & communication | 1997 |
| Swasthik Homes Ltd | Real estate | 2023 |
| Sweatpretty Ltd | Other services | 2025 |
| Swedish Express Ltd | Transport & logistics | 2021 |
| Sweet & Scrumptious Carts Ltd | Hospitality | 2025 |
| Sweet Art Group Ltd | Manufacturing | 2026 |
| Sweet LET Limited | Real estate | 2012 |
| Sweet Retreat Shop Ltd | Wholesale & retail | 2023 |
| Swies Ltd | Transport & logistics | 2021 |
| Swift and Bold Haulage Ltd | Transport & logistics | 2023 |
| Swift Borders Ltd | Transport & logistics | 2020 |
| Swift Design Services Limited | Professional & scientific | 1998 |
| Swift Valley Sporting Ltd | Arts & recreation | 2018 |
| Swifting Ltd | Wholesale & retail | 2023 |
| Swilliams Ltd | Other services | 2024 |
| Swim 4 Ever CIC | Education | 2025 |
| Swim Works Limited | Arts & recreation | 2014 |
| Swinford Management Company Limited | Households | 2023 |
| Swinford Meadow Management Company Limited | Households | 2022 |
| Swinson Masonry Limited | Manufacturing | 2005 |
| Swipe Right Recruitment Ltd | Administrative & support | 2025 |
| Switch Construction Ltd | Construction | 2025 |
| SWO Precision Fasteners Limited | Wholesale & retail | 2025 |
| Sydel Logistics Ltd | Transport & logistics | 2020 |
| Syehu Ltd | Other services | 2020 |
| Sylvester Estates Limited | Construction | 1993 |
| Symon Builders Limited | Construction | 1985 |
| Synergy Sourcing Limited | Administrative & support | 2007 |
| Szepi Ltd | Transport & logistics | 2019 |
| Szlachcic Ltd | Transport & logistics | 2017 |
| Szop Ltd | Wholesale & retail | 2017 |
| T & C Fibre Solutions Limited | Information & communication | 2024 |
| T & L Contractors Limited | Construction | 2025 |
| T & V Yates Limited | Wholesale & retail | 2017 |
| T a Travel Ltd | Administrative & support | 2022 |
| T C Metalworx Limited | Professional & scientific | 2009 |
| T Five Properties Limited | Real estate | 2012 |
| T H DEW & Sons Limited | Construction | 2002 |
| T M P Driver Limited | Transport & logistics | 2017 |
| T Morgan Engineering Solutions Ltd | Manufacturing | 2025 |
| T P Supplies Limited | Wholesale & retail | 2023 |
| T Plant Solutions Limited | Administrative & support | 2022 |
| T Slater Transport Limited | Transport & logistics | 2017 |
| T Smith CM Ltd | Professional & scientific | 2025 |
| T Spence Electrical Limited | Construction | 2008 |
| T T Roman Limited | Financial services | 2002 |
| T.C.R. Machine Tools (Europe) Limited | Professional & scientific | 1998 |
| TA College Limited | Professional & scientific | 2017 |
| TAA Service | Health & social care | 2011 |
| Tablesport Limited | Arts & recreation | 1962 |
| Tabletop Trove & Trade Ltd | Wholesale & retail | 2025 |
| Tacit Golf LLP | | 2008 |
| Tacit Limited | Manufacturing | 1996 |
| Tadashi DO Ltd | Education | 2026 |
| Tade Security Services Limited | Administrative & support | 2017 |
| Tadeusz Kulik Transport Ltd. | Transport & logistics | 2016 |
| Tadi Market Limited | Wholesale & retail | 2018 |
| Taho Consulting Limited | Professional & scientific | 2018 |
| Tailby Brack Limited | Water & waste | 1991 |
| Tailor Accountancy & Consultancy Ltd | Professional & scientific | 2026 |
| Take & Go Ltd | Transport & logistics | 2021 |
| Takhar and Sons Limited | Real estate | 2019 |
| Takrom Limited | Real estate | 2023 |
| Taksh Limited | Real estate | 2021 |
| Talam CIC | Manufacturing | 2019 |
| Talaway Hotels Limited | Hospitality | 1986 |
| Talescape Ltd | Information & communication | 2024 |
| Talking EYE Limited | Wholesale & retail | 2006 |
| Tall Trees Business Park Ltd | Construction | 2024 |
| Talon Bay Studios Limited | Information & communication | 2020 |
| Talwar Enterprises Limited | Wholesale & retail | 2024 |
| TAM Advisory Ltd | Professional & scientific | 2025 |
| Tamera's Kitchen Ltd | Hospitality | 2018 |
| Tamil Carrom Union UK Limited | Education | 2025 |
| Tamil Community Rugby CIC | Arts & recreation | 2023 |
| Tamworth Pearl LLP | | 2016 |
| Tamyhot Ltd | Wholesale & retail | 2025 |
| Tan-Tastic Sports Ltd | Education | 2024 |
| Tannahill Independant Transport Limited | Transport & logistics | 2013 |
| Tant Living Ltd | Other services | 2026 |
| TAP to WIN Limited | Information & communication | 2012 |
| Tapalaga Limited | Transport & logistics | 2020 |
| Tara Foods Limited | Hospitality | 2024 |
| Tarbogir Ltd | Health & social care | 2016 |
| Tarka Four Ltd | Other services | 2024 |
| Tarmac Surfacing UK Ltd | Construction | 2025 |
| TAS 24 Ltd | Real estate | 2024 |
| Taskview Limited | Professional & scientific | 2000 |
| Tasmin Properties Limited | Real estate | 1990 |
| Taste of Hawaii Limited | Wholesale & retail | 2011 |
| TASTEE9JA Ltd | Hospitality | 2022 |
| Tate Civils Ltd | Real estate | 2011 |
| Tatenda RAD Limited | Health & social care | 2021 |
| Taurus Composites Ltd | Manufacturing | 2023 |
| TAV Technologies Ltd | Information & communication | 2017 |
| Tavishk Consultancy Ltd | Professional & scientific | 2024 |
| Tavishk Investments Ltd | Real estate | 2020 |
| Tavola Rugby Ltd | Hospitality | 2026 |
| Tax Tech Enterprise Ltd | Information & communication | 2019 |
| Taylor May'D Ltd | Wholesale & retail | 2017 |