| Tomrock Services Ltd | Professional & scientific | 2015 |
| Tomsyl Ltd | Transport & logistics | 2018 |
| TON Baror Contracts Ltd | Administrative & support | 2019 |
| TON Transport Limited | Professional & scientific | 2022 |
| Tony Bruce Consulting Ltd | Information & communication | 2025 |
| Tony Electrical Limited | Construction | 2025 |
| Tony’S Olive Farm Limited | Wholesale & retail | 2025 |
| Tool Point Trading L.L.C Limited | Wholesale & retail | 2025 |
| Toolgram Equipments Private Limited | Manufacturing | 2024 |
| Top Beef Smash Burgers & Desserts Ltd | Hospitality | 2023 |
| Top Building Specialists Limited | Construction | 2023 |
| Top Choice Beauty Salon Ltd | Other services | 2025 |
| Top Continental Education Ltd | Administrative & support | 2021 |
| Top Dog Cover Limited | Financial services | 2023 |
| Top Edge Sports Ltd | Education | 2024 |
| Top Executive Security Limited | Administrative & support | 2022 |
| Top Fast Consultancy Ltd | Professional & scientific | 2024 |
| Top Gear Automotive Ltd | Wholesale & retail | 2022 |
| Top Grill Stevenage Ltd | Hospitality | 2025 |
| Top IT OFF Flavas Ltd | Manufacturing | 2026 |
| Top IT OFF Fusion Ltd | Hospitality | 2023 |
| Top IT OFF Holdings Ltd | Financial services | 2024 |
| Top IT OFF on the Go Ltd | Wholesale & retail | 2024 |
| Top IT OFF on Tour Ltd | Hospitality | 2026 |
| Top IT OFF Signature Services Ltd | Hospitality | 2026 |
| Top Kebab & Burgers Limited | Hospitality | 2025 |
| Top Kitchens Quartz Limited | Construction | 2020 |
| Top Kleen Ltd | Other services | 2022 |
| Top Level Roofing & Building Solutions Limited | Construction | 2024 |
| Top Line 030719 Limited | Professional & scientific | 2007 |
| Top Marketing & Sales Limited | Other services | 2018 |
| Top MEN Solutions Ltd | Construction | 2022 |
| Top Quality Rentals Limited | Real estate | 2026 |
| Top Solutions CGK Limited | Professional & scientific | 2017 |
| Top Source Security Limited | Administrative & support | 2020 |
| Top Tier Care Ltd | Administrative & support | 2018 |
| Top-In Digital Ltd | Information & communication | 2024 |
| TOP9 Solicitors & Advocates Ltd | Professional & scientific | 2026 |
| Topham Properties Limited | Real estate | 2020 |
| Topline Commercial Properties Ltd | Real estate | 2025 |
| Topline Property Associates Limited | Real estate | 2021 |
| Topline Property Holdings Ltd | Financial services | 2025 |
| Topmost Ventures Ltd | Health & social care | 2014 |
| Topp Gear Driving School Ltd | Education | 2024 |
| Toprak Restaurant (Luton) Limited | Hospitality | 2016 |
| Tops 2401 Limited | Hospitality | 2024 |
| Tops 2404 Limited | Hospitality | 2024 |
| Tops 2604 Limited | Hospitality | 2026 |
| Tops Delivery 0725 Limited | Hospitality | 2025 |
| Tops Delivery 2405 Limited | Hospitality | 2024 |
| Tops Delivery Service Limited | Hospitality | 2024 |
| Tops Logistics Ltd | Transport & logistics | 2025 |
| Tops Pizza 2507 Limited | Hospitality | 2025 |
| Tops Pizza Corby Ltd | Hospitality | 2024 |
| Tops Pizza Wellington Street Ltd | Hospitality | 2021 |
| Topsam Limited | Construction | 2023 |
| Toptints Limited | Wholesale & retail | 2023 |
| Tori Bonita Ltd | Other services | 2023 |
| Tormaa Ltd | Construction | 2026 |
| Torok Simon Limited | Construction | 2020 |
| Torsion Limited | Administrative & support | 2009 |
| Torus Holdings Limited | Financial services | 2017 |
| Torus Pharma Ltd | Other services | 2023 |
| Tosu Technologies Ltd | Wholesale & retail | 2026 |
| Tosuner Ltd | Real estate | 2024 |
| Tota Spark Ltd | Administrative & support | 2017 |
| Total Attachment Healthcare Limited | Administrative & support | 2023 |
| Total Care Healthcare Ltd | Health & social care | 2021 |
| Total Driveways Ltd | Construction | 2026 |
| Total Education & Training Ltd | Education | 2022 |
| Total Home Improvements Plymouth Ltd | Administrative & support | 2022 |
| Total NON Brand (TNB) Limited | Information & communication | 2014 |
| Total Paving Solutions Limited | Administrative & support | 2017 |
| Total Social Support Limited | Public administration | 2021 |
| Total Temperature Management Ltd | Transport & logistics | 2009 |
| Total Travel Solution Group Limited | Information & communication | 2025 |
| Totalcom Limited | Wholesale & retail | 2024 |
| Totalshine Cleaning Services Limited | Administrative & support | 2025 |
| Totegic Ltd | Wholesale & retail | 2023 |
| Toto MIA Limited | Administrative & support | 2020 |
| Tots Academy Limited | Education | 2023 |
| Totternhoe Consultants Ltd | Administrative & support | 2014 |
| Totti Properties Ltd | Real estate | 2024 |
| Touch I.T. Ltd | Wholesale & retail | 2004 |
| Touch of Class Luton Limited | Other services | 2015 |
| Touchstone 1 Limited | Wholesale & retail | 2022 |
| TOW Track Services Limited | Wholesale & retail | 2024 |
| Towa Supermarket Ltd | Wholesale & retail | 2024 |
| Towbo Home & Property Solutions Limited | Construction | 2025 |
| Tower Bridge Capital Ltd | Real estate | 2025 |
| Tower UK Services Limited | Transport & logistics | 2022 |
| Towers Investments Limited | Real estate | 2016 |
| Town & City Property Ltd | Real estate | 2023 |
| Town and Country Mortgage Protection Limited | Financial services | 2019 |
| Town and Country Mortgage Services Limited | Financial services | 2002 |
| Town Wharf (LB) (2) Management Limited | Real estate | 2015 |
| Town Wharf (LB) Management Limited | Households | 2006 |
| Towtrucktoday Ltd | Wholesale & retail | 2022 |
| Toys and Clothes Limited | Information & communication | 2003 |
| TP Motors Ltd | Wholesale & retail | 2015 |