| Tiny Tembo Ltd | Hospitality | 2026 |
| Tipner Road Freehold Limited | Households | 2024 |
| Tishena Ltd | Health & social care | 2017 |
| TJ Chef Hire Ltd | Hospitality | 2016 |
| TJ Roofing Ltd | Construction | 2020 |
| TJ Savage Consulting Ltd | Administrative & support | 2023 |
| TJC Roofing Southern Ltd | Construction | 2026 |
| TJH Developments Ltd | Construction | 2020 |
| TJS PUB Co Ltd | Hospitality | 2017 |
| TK Roofing (Southern) Ltd | Construction | 2025 |
| TLC Mechanical Services Ltd | Construction | 2022 |
| TLD Homes Ltd | Real estate | 2025 |
| TLE Productions Limited | Professional & scientific | 2017 |
| TLH BED & Breakfast Limited | Hospitality | 2017 |
| TLR Aesthetics and Beauty Ltd | Other services | 2021 |
| TLT Tiling Limited | Construction | 2017 |
| TM Scrubz Cleaning Limited | Administrative & support | 2025 |
| TMA Portsmouth Ltd | Arts & recreation | 2026 |
| Tmontanna Limited | Information & communication | 2024 |
| Tmotorsport Limited | Professional & scientific | 2026 |
| TMT Couriers Ltd | Transport & logistics | 2015 |
| TMT Rentals Ltd | Administrative & support | 2025 |
| Tmte Limited | Professional & scientific | 2014 |
| TNT Brickwork Ltd | Construction | 2015 |
| TNT Catering Ltd | Hospitality | 2024 |
| Tobeli Limited | Professional & scientific | 2014 |
| Todd Construction & Development Limited | Construction | 2018 |
| Todjom& Co Ltd | Transport & logistics | 2025 |
| Todu Care Services Ltd | Administrative & support | 2023 |
| Together Care Consulting Limited | Professional & scientific | 2021 |
| Together Co-Living Ltd | Real estate | 2025 |
| Together WE Care 24 Healthcare Ltd | Administrative & support | 2019 |
| Toka Properties Limited | Real estate | 2021 |
| Token 4U Limited | Wholesale & retail | 2025 |
| Tollhouse Catering (South West ) Ltd | Hospitality | 2018 |
| Tollon Limited | Information & communication | 1998 |
| TOM Allen Carpentry Ltd | Manufacturing | 2022 |
| TOM, Dick and Harry FAT Sandwiches Ltd | Hospitality | 2024 |
| Tom-Bud Ltd | Manufacturing | 2024 |
| Tombi Steel Fabrications Ltd | Manufacturing | 2020 |
| Tomburn Limited | Manufacturing | 1995 |
| Tommy Phillips Limited | Information & communication | 2026 |
| Toms Motorcycles Ltd | Administrative & support | 2026 |
| Tonic Music for Mental Health Ltd | Health & social care | 2012 |
| Tonic Projects Limited | Real estate | 2022 |
| Tony Car Sales Ltd | Wholesale & retail | 2023 |
| Tony Motors Ltd | Wholesale & retail | 2026 |
| Toob Limited | Information & communication | 2017 |
| Toob Topco Limited | Information & communication | 2023 |
| Tooba Health and Wellbeing Ltd | Health & social care | 2020 |
| Toothwhitening.Co.Uk Limited | Wholesale & retail | 2018 |
| Top Class Property Ltd | Households | 2025 |
| Top Engineers Ltd | Professional & scientific | 2014 |
| Top Line Projects Ltd | Construction | 2019 |
| Top Party Games Ltd | Information & communication | 2021 |
| Top Plumb GAS Division Ltd | Construction | 2025 |
| Top Scissors Ltd | Other services | 2015 |
| Top Tots Day Nursery Fort Purbrook Limited | Education | 2020 |
| Top Tots Day Nursery Hedgerow House Limited | Education | 2019 |
| Top Tots Day Nursery Limited | Administrative & support | 2012 |
| Top Tots Day Nursery MLC Ltd | Education | 2015 |
| Top Tots Day Nursery Northern Parade Ltd | Education | 2025 |
| Top Tots Day Nursery Union Street Ltd | Education | 2023 |
| Top Travel Agent & Cargo Services Ltd | Administrative & support | 2024 |
| Topgun Sealant Limited | Construction | 2019 |
| Topiwanashe Ltd | Health & social care | 2019 |
| Toplana Ltd | Administrative & support | 2025 |
| Topline Windows & Conservatories Southern Limited | Construction | 1999 |
| Topspot Snooker & Pool Ltd | Arts & recreation | 2025 |
| Torq Cinema Ltd | Administrative & support | 2016 |
| Torrington Town Mill Limited | Hospitality | 2021 |
| Tota Steelfixing Ltd | Construction | 2018 |
| Total BMX Ltd | Administrative & support | 2010 |
| Total Car Maintenance Limited | Wholesale & retail | 2014 |
| Total Composite Solutions (TCS) Limited | Professional & scientific | 2018 |
| Total Eclipse Holdings Ltd | Financial services | 2025 |
| Totally Connected Limited | Information & communication | 2019 |
| Totier Global Services Limited | Transport & logistics | 2018 |
| Totier Properties Ltd | Real estate | 2026 |
| Toucan Diversity Training C.I.C. | Education | 2013 |
| Touss International Ltd | Other services | 2015 |
| Towa Healthcare Ltd | Health & social care | 2023 |
| Towardshome Ltd | Health & social care | 2019 |
| Town & Country Covers Limited | Wholesale & retail | 2004 |
| Toys Space Genies Ltd | Wholesale & retail | 2026 |
| TP Marine Consultancy Limited | Professional & scientific | 2025 |
| TPB Holdings Limited | Financial services | 2023 |
| TPC Paltora Ltd | Financial services | 2017 |
| Tphw Ltd | Financial services | 2022 |
| Tpmr Ltd | Professional & scientific | 2020 |
| TPN Baby Bank CIC | Administrative & support | 2025 |
| TPX Academy Ltd. | Professional & scientific | 2017 |
| TPX Group Holdings Ltd. | Financial services | 2022 |
| TPX Planning Ltd. | Professional & scientific | 2012 |
| TR Tickets Limited | Professional & scientific | 2026 |
| Traceinline Limited | Other services | 2013 |
| Tracey Sadler Ltd | Administrative & support | 2015 |
| Traceys Recovery Ltd. | Transport & logistics | 2017 |
| Tracouk Ltd | Water & waste | 2013 |
| Trade Mates Property Developments Limited | Construction | 2014 |