| THE Old Wisteria Hotel Ltd | Hospitality | 2007 |
| THE Other 67 Limited | Professional & scientific | 2024 |
| THE Priory Partnership | | 2001 |
| THE Profitable Nursery Academy Ltd | Administrative & support | 2026 |
| THE Proper PUB Company Limited | Hospitality | 2001 |
| THE Ramon Property Company Ltd | Real estate | 2020 |
| THE Reach Marketplace Limited | Wholesale & retail | 2017 |
| THE Rutland Counsellor Ltd | Health & social care | 2019 |
| THE Rutland Distillery Company Ltd | Manufacturing | 2018 |
| THE Rutland Dog Walker Ltd | Other services | 2017 |
| THE Rutland Learning Trust | Education | 2014 |
| THE Rutland Marquee Company Limited | Administrative & support | 2010 |
| THE Rutland Tack Room Ltd | Wholesale & retail | 2025 |
| THE Rutland Webdesigner Limited | Information & communication | 2024 |
| THE Rutland Workshop Limited | Other services | 2012 |
| THE Stamford Partnership | | 2001 |
| THE Stocken Hall Company Limited | Households | 2005 |
| THE Sustainable Haus Ltd | Construction | 2023 |
| THE Terrace (Oakham) Management Company Limited | Households | 2004 |
| THE Vaults Inns Limited | Hospitality | 2011 |
| THE Vintage Agency Ltd | Arts & recreation | 2015 |
| THE Wandering Office Limited | Information & communication | 2009 |
| THE Water Mill Lettings Ltd | Real estate | 2021 |
| THE Wills Group Limited | Financial services | 2023 |
| Thedesigncompany Ltd | Professional & scientific | 2022 |
| Thekcontentclub Ltd | Professional & scientific | 2026 |
| Thingc Ltd | Financial services | 2024 |
| Thinking Differently Limited | Wholesale & retail | 2020 |
| Thistle and Rose Properties Ltd | Real estate | 2024 |
| Thistle and Threshold Property Ltd | Real estate | 2026 |
| Thomas Hairdressing Group Limited | Other services | 2017 |
| Thomas James Mortgage Solutions Limited | Financial services | 2016 |
| Thorgil Brokers Limited | Professional & scientific | 2003 |
| Thorpe Gardens Management Company Limited | Households | 2000 |
| Three Crowns Barrow Limited | Hospitality | 2025 |
| Thunderchild Investments Limited | Hospitality | 2010 |
| Thurrock Forklift Trucks Limited | Manufacturing | 2014 |
| TIB Services Ltd | Administrative & support | 2013 |
| Tictac Horses & Ponies Ltd | Agriculture & fishing | 2023 |
| Tiddco Ltd | Professional & scientific | 2022 |
| Timon Analytics Ltd | Information & communication | 2020 |
| Timon Investments Models and Signals Limited | Financial services | 2025 |
| Timothy Davis Psychotherapy Ltd | Health & social care | 2021 |
| Tipsy Events Ltd | Hospitality | 2025 |
| Titan Mechanical & Plumbing Services Ltd | Construction | 2025 |
| TKD Group Limited | Manufacturing | 2020 |
| Toast Media Limited | Professional & scientific | 2013 |
| Tods Terrace Management Company Limited | Households | 2019 |
| Tolui Ltd | Professional & scientific | 2025 |
| TOM Allam Sound Ltd | Information & communication | 2023 |
| TOM Gilman Farms Limited | Agriculture & fishing | 2000 |
| TOMJ4CKSON Ltd | Professional & scientific | 2025 |
| Toons Yard Management Company Limited | Households | 2012 |
| Top 555 Holdings Limited | Financial services | 2024 |
| Top 555 Limited | Wholesale & retail | 2001 |
| Total Interim Management Limited | Professional & scientific | 2010 |
| Tramigo UK Limited | Wholesale & retail | 2010 |
| Transparentchoice Limited | Information & communication | 2013 |
| Travelgift Ltd | Wholesale & retail | 2012 |
| Tremour Boards Limited | Wholesale & retail | 2026 |
| TRENT1 (Nottingham) Ltd | Real estate | 2025 |
| TRENT2 (Nottingham) Ltd | Real estate | 2025 |
| Trilogee Equine Transport Ltd | Transport & logistics | 2026 |
| Trilogy Sports Horses Ltd | Agriculture & fishing | 2018 |
| Truemark Ltd | Professional & scientific | 2015 |
| Truespire Limited | Wholesale & retail | 2026 |
| Tscook Limited | Information & communication | 2009 |
| Tsdbull Ltd | Hospitality | 2024 |
| Tt&L Limited | Real estate | 2018 |
| Tuoozie Limited | Wholesale & retail | 2023 |
| Turner Stock Ltd | Other services | 2023 |
| Two Chimps Coffee Limited | Manufacturing | 2016 |
| Two XLX Limited | Professional & scientific | 2015 |
| TWW Enterprises Ltd | Professional & scientific | 2023 |
| TY Cornel Retreats Limited | Real estate | 2025 |
| Tyler Farms Limited | Agriculture & fishing | 2010 |
| U-Comms (Rutland) Ltd | Information & communication | 2020 |
| UK Estate Planning Ltd | Professional & scientific | 2019 |
| UK Used Racking Limited | Extraterritorial | 2025 |
| Uk-Replay Ltd | Wholesale & retail | 2014 |
| Ukcanvasprints Ltd | Wholesale & retail | 2021 |
| Ulceby Farms Limited | Agriculture & fishing | 1956 |
| Upphingham Welcome Minishop Ltd | Wholesale & retail | 2024 |
| Uppingham Barbers Ltd | Other services | 2024 |
| Uppingham Brewery Limited | Manufacturing | 2017 |
| Uppingham Brewhouse Limited | Manufacturing | 2017 |
| Uppingham Developments Ltd | Construction | 2015 |
| Uppingham First | Information & communication | 2009 |
| Uppingham Gate Management Limited | Real estate | 2007 |
| Uppingham Indoor Bowls Club Limited | Arts & recreation | 2025 |
| Uppingham Lettings Ltd | Real estate | 2020 |
| Uppingham School Enterprises Limited | Wholesale & retail | 1973 |
| Uppingham School International Limited | Professional & scientific | 2015 |
| Uppingham Spice Limited | Hospitality | 2025 |
| Uppingham Stone Limited | Construction | 2013 |
| Uppingham Stoves Limited | Administrative & support | 2023 |
| Uppingham Town Football Club Limited | Arts & recreation | 2025 |
| Urban Houzz Ltd | Construction | 2023 |
| Urban Movement Primary Ltd | Arts & recreation | 2011 |
| Urbis Property Company Limited | Real estate | 2002 |