| TB Trans Ltd | Transport & logistics | 2025 |
| TB23 Ltd | Wholesale & retail | 2026 |
| TBX Prime Ltd | Transport & logistics | 2025 |
| TC BB Limited | Professional & scientific | 2000 |
| TCL Resources Ltd | Other services | 2017 |
| TCM Service Ltd | Wholesale & retail | 2013 |
| Tcmc Property Limited | Real estate | 2021 |
| Tcns Holdings Limited | Financial services | 2017 |
| TCS Global Fibre Solutions Limited | Information & communication | 2026 |
| TCW Support Services Limited | Health & social care | 2015 |
| TDH Recruitment Limited | Transport & logistics | 2018 |
| TDL Enterprises Limited | Real estate | 1999 |
| TDR Property Management Ltd | Real estate | 2022 |
| TDS WE ARE Ltd | Transport & logistics | 2016 |
| TDT Machine Tools Limited | Other services | 1993 |
| TDW Business Services Ltd | Information & communication | 2019 |
| TDW Consultancy Ltd | Transport & logistics | 2024 |
| TE Design Limited | Professional & scientific | 2011 |
| Teabuzz Ltd | Hospitality | 2023 |
| Teaching for Learning Ltd | Education | 2008 |
| Teal Cart Ltd | Wholesale & retail | 2020 |
| Team MI Racing Ltd | Arts & recreation | 2025 |
| Tebbs Garden House Ltd | Real estate | 2026 |
| Tebbs Property Ltd | Real estate | 2020 |
| TEC Prime Ltd | Other services | 2019 |
| Tech-Speed Motorsport Limited | Administrative & support | 1999 |
| Technetworks Ltd | Information & communication | 2020 |
| Techno Group Limited | Manufacturing | 1977 |
| Technobots Ltd | Wholesale & retail | 2001 |
| Technoset Limited | Manufacturing | 1995 |
| Technovue Ltd | Information & communication | 2025 |
| Techunify Solutions Ltd | Information & communication | 2025 |
| Teda Brooks Ltd | Wholesale & retail | 2025 |
| Teeoff Ltd | Information & communication | 2024 |
| Tegama Limited | Real estate | 2003 |
| Tegra Systems Limited | Construction | 2026 |
| Tehwiz Ltd | Information & communication | 2017 |
| Teju Solutions Limited | Information & communication | 2018 |
| Telefibre Ltd | Information & communication | 2022 |
| Tellori Ltd | Information & communication | 2020 |
| Temple Court Properties (Rugby) Limited | Households | 1987 |
| Tenstar GG Ltd | Information & communication | 2021 |
| Tenstar Personnel Limited | Information & communication | 2018 |
| Terracotta Retail Limited | Wholesale & retail | 2014 |
| Terrain Surveys Midlands Limited | Professional & scientific | 2003 |
| Terranex Installations Ltd | Construction | 2026 |
| Tess Training Limited | Information & communication | 2025 |
| Testify Xpert Limited | Information & communication | 2025 |
| Textperfect Limited | Information & communication | 2009 |
| TFG Fencing Ltd | Construction | 2026 |
| Tfil Design Studio Ltd | Professional & scientific | 2019 |
| TFX Services Ltd | Administrative & support | 2024 |
| TG Electrical Services (Rugby) Limited | Energy | 1997 |
| TG Sales Ltd | Wholesale & retail | 2024 |
| Tgca Transport Ltd | Transport & logistics | 2021 |
| Thames Nutra Ltd | Wholesale & retail | 2026 |
| THE Advertising Bike Company Ltd | Professional & scientific | 2003 |
| THE Air Ambulance Service | Health & social care | 2003 |
| THE Air Ambulance Service Aviation Limited | Transport & logistics | 2011 |
| THE Air Ambulance Service Events Limited | Extraterritorial | 2011 |
| THE Air Ambulance Service Recycling Limited | Extraterritorial | 2011 |
| THE Air Ambulance Service Trading Limited | Wholesale & retail | 2009 |
| THE Alexandra Arts Company Ltd | Wholesale & retail | 2021 |
| THE Allergy Badge Limited | Administrative & support | 2019 |
| THE Arnold Foundation for Rugby School | Education | 2002 |
| THE Artizzan Ltd | Hospitality | 2020 |
| THE Auction Company (UK) Ltd | Administrative & support | 2019 |
| THE Auction Experts Ltd | Extraterritorial | 2023 |
| THE Barn Interiors Ltd | Professional & scientific | 2026 |
| THE Bell Inn Rugby Limited | Hospitality | 2015 |
| THE Bernhard Academy Limited | Education | 2022 |
| THE Best Chicken Shop Limited | Hospitality | 2023 |
| THE Best of Both Limited | Administrative & support | 2003 |
| THE Big Bounce House Ltd | Arts & recreation | 2023 |
| THE Big Sing Choir UK Limited | Arts & recreation | 2015 |
| THE Black Balloon Limited | Wholesale & retail | 1998 |
| THE Blind Company UK Limited | Manufacturing | 2007 |
| THE Blooming Country PUB Limited | Hospitality | 2023 |
| THE Blue Buoys Ltd | Education | 2022 |
| THE Boat Inn Rugby Ltd | Hospitality | 2025 |
| THE Business Sale Experts Limited | Real estate | 2024 |
| THE Caravan Company (Wimborne) Limited | Wholesale & retail | 1994 |
| THE Chef's Kitchen (UK) Limited | Hospitality | 2009 |
| THE Chefs Kitchen Rugby Ltd | Hospitality | 2024 |
| THE Children's Air Ambulance | Administrative & support | 2005 |
| THE Chopping Block Catering Company Ltd | Hospitality | 2012 |
| THE Coeliac Lifestyle Ltd | Health & social care | 2018 |
| THE Collective Savers Holdings Ltd | Information & communication | 2026 |
| THE Commercial Property Experts Limited | Real estate | 2024 |
| THE Communication Stop Ltd | Administrative & support | 2015 |
| THE Company of Master Jewellers Limited | Wholesale & retail | 1980 |
| THE Conveyancing Experts Nationwide Ltd | Extraterritorial | 2023 |
| THE Copper Kettle Cafe Ltd | Hospitality | 2022 |
| THE Crazy Golf Experience Ltd. | Administrative & support | 2024 |
| THE Croft Rugby Management Company Limited | Households | 2005 |
| THE Customer Consultancy Ltd | Professional & scientific | 2016 |
| THE Customiser Ltd | Professional & scientific | 2018 |
| THE Davey Corporation Ltd | Professional & scientific | 2017 |
| THE Deborah Project CIC | Hospitality | 2026 |
| THE Desi Food Studio Ltd | Hospitality | 2025 |