| TR Property Leicester Ltd | Real estate | 2023 |
| Trabia Ltd | Administrative & support | 2025 |
| Trac Start Limited | Construction | 2022 |
| Trace Property Ltd | Real estate | 2021 |
| Tracey O'Brien Limited | Other services | 2003 |
| Track Forwarding Ltd | Wholesale & retail | 2012 |
| Track Support Services Ltd | Wholesale & retail | 2025 |
| Track-Able Ltd | Transport & logistics | 2023 |
| Tracking Specialist Ltd | Wholesale & retail | 2024 |
| Trackivo Technologies Ltd | Information & communication | 2025 |
| Tracko Limited | Transport & logistics | 2025 |
| Tracy Dixon Chiropractic Ltd | Health & social care | 2011 |
| Tracy Harrison Limited | Other services | 2003 |
| Tracy Ward Textiles Limited | Other services | 2001 |
| Trade Electrical Services Limited | Construction | 2007 |
| Trade Engine AI Ltd | Information & communication | 2026 |
| Trade Fabrics Ltd | Manufacturing | 2013 |
| Trade Fashion Hub Ltd | Wholesale & retail | 2024 |
| Trade Finder Services Ltd | Construction | 2025 |
| Trade Fire Suppression Limited | Administrative & support | 2012 |
| Trade Floors Direct Ltd | Wholesale & retail | 2023 |
| Trade Garage Equipment Limited | Administrative & support | 2005 |
| Trade Lanyards Limited | Other services | 2019 |
| Trade Locker Ltd | Wholesale & retail | 2022 |
| Trade London Ltd | Wholesale & retail | 2018 |
| Trade Perks Ltd | Professional & scientific | 2025 |
| Trade Price Plastics Ltd | Wholesale & retail | 2023 |
| Trade Sexual Health | Health & social care | 2000 |
| Trade Van Centre Ltd | Wholesale & retail | 2013 |
| Trade Wise Tree Care Limited | Construction | 2025 |
| Trade X Hub Leicester Ltd | Wholesale & retail | 2026 |
| Tradeboardz Ltd | Wholesale & retail | 2025 |
| Tradeco (UK) Ltd | Wholesale & retail | 2013 |
| Tradecore Ltd | Wholesale & retail | 2012 |
| Tradedek Limited | Wholesale & retail | 2022 |
| Traden Displays Limited | Manufacturing | 2023 |
| Tradepo Limited | Wholesale & retail | 2025 |
| Trader Kane's Ltd | Real estate | 2020 |
| Trader Kumar Ltd | Wholesale & retail | 2024 |
| Tradewii Cards Limited | Wholesale & retail | 2023 |
| Tradewise Analytics Limited | Professional & scientific | 2023 |
| Tradewise Driveways Ltd | Construction | 2026 |
| Tradewiz Ltd | Wholesale & retail | 2023 |
| Trading Ocean Limited | Manufacturing | 2025 |
| Trading Services Ltd | Construction | 2019 |
| Trading Smart (UK) Ltd | Transport & logistics | 2018 |
| Trading Village Ltd | Other services | 1986 |
| Trading World Ltd | Wholesale & retail | 2015 |
| Traditional Carpentry Solutions Limited | Construction | 2017 |
| Traditional Clothing Company Limited | Manufacturing | 1996 |
| Trafalgar Carpets Ltd | Wholesale & retail | 2022 |
| Trafalgar Court Apartments Limited | Real estate | 2024 |
| Trafalgar Flooring and Beds Limited | Real estate | 1989 |
| Trafalgar Scientific Limited | Wholesale & retail | 1993 |
| Traffic Management Technologies Limited | Transport & logistics | 2014 |
| Trafford Knitwear Limited | Wholesale & retail | 1986 |
| Traffsec Ltd | Transport & logistics | 2022 |
| Tragenattire Ltd | Wholesale & retail | 2025 |
| Trah Global Ltd | Wholesale & retail | 2025 |
| Trailhealthcare Limited | Health & social care | 2023 |
| Trailmed Limited | Health & social care | 2016 |
| Train Insane Ltd | Manufacturing | 2023 |
| Train LDN Ltd | Arts & recreation | 2020 |
| Train Together Limited | Education | 2010 |
| Trained by Danny Ltd | Other services | 2021 |
| Trainer (Holdings) Limited | Financial services | 2013 |
| Trainer Box Ltd | Wholesale & retail | 2025 |
| Trainhas Limited | Health & social care | 2016 |
| Training Minds Ltd | Information & communication | 2004 |
| TRAINING3SIXTY Limited | Professional & scientific | 2018 |
| Trajbar Cleaning Limited | Administrative & support | 2020 |
| Trakr Healthcare Ltd | Wholesale & retail | 2024 |
| Tranquil Accommodation Limited | Hospitality | 2024 |
| Tranquil Holdings 24 Limited | Financial services | 2025 |
| Tranquil Holiday Rentals Limited | Hospitality | 2025 |
| Tranquility Garden | Health & social care | 2022 |
| Tranquility Garden Rooms Ltd | Construction | 2020 |
| Tranquility Homes (Hinckley) Ltd | Real estate | 2022 |
| Tranquility Homes (HMO) Ltd | Real estate | 2020 |
| Tranquility Homes (Holdings) Ltd | Professional & scientific | 2021 |
| Tranquility Homes (Property) Ltd | Real estate | 2018 |
| Tranquility Homes (Students) Ltd | Real estate | 2021 |
| Tranquility Homes Ltd | Real estate | 2017 |
| Tranquility Living Ltd | Hospitality | 2015 |
| Tranquillity Healthcare Services Ltd | Real estate | 2023 |
| Trans Holdings & Investments Ltd | Real estate | 2020 |
| TRANS4M Leicester C.I.C. | Hospitality | 2013 |
| Transact Client VN Ltd | Information & communication | 2025 |
| Transcend Plumbing & Heating Contractors Limited | Construction | 2018 |
| Transcend Rehabilitation Ltd | Professional & scientific | 2018 |
| Transcend Secretarial Services Limited | Administrative & support | 2025 |
| Transfigure Leicester Limited | Real estate | 2024 |
| Transfigure Limited | Real estate | 2000 |
| Transfigure Loughborough Limited | Real estate | 2024 |
| Transform Business Advisers and Accountants Ltd | Professional & scientific | 2014 |
| Transform Interiors Contracts Limited | Construction | 2001 |
| Transformation Fit Ltd. | Other services | 2015 |
| Transformers ... Your To-Do-List, Done! Ltd | Construction | 2019 |
| Transformmr Ltd | Professional & scientific | 2020 |
| Transgate Ltd | Wholesale & retail | 2001 |