| Three Bridges Football Club Limited | Arts & recreation | 2022 |
| Three Bridges Youth Football Club CIC | Education | 2024 |
| Three Dogs Bakery Limited | Manufacturing | 2026 |
| Three Oaks Family Trust Company Limited(The) | Professional & scientific | 1986 |
| Threeways Care Limited | Health & social care | 2013 |
| Thrift Landscapes Limited | Administrative & support | 2003 |
| Through Tudor Tutoring Ltd | Education | 2022 |
| Thrustssc Team Limited | Arts & recreation | 2007 |
| Tianan Technology UK Co., Ltd | Information & communication | 2021 |
| Tida’S Kitchen Limited | Hospitality | 2025 |
| Tigon Cover Services Limited | Financial services | 2019 |
| Tigris Restaurant Ltd | Hospitality | 2018 |
| Tilakdjs Limited | Households | 2026 |
| Tilgate Bakery Catering Limited | Hospitality | 2019 |
| Tilgate Bakery Limited | Wholesale & retail | 2012 |
| Tilgate Chippy Ltd | Hospitality | 2025 |
| Tilgate Dental Care Limited | Health & social care | 2007 |
| Tilgate Fish Plaice Limited | Hospitality | 2017 |
| Tilgate Metal Recycling Ltd | Wholesale & retail | 2021 |
| Tilgate Park Watersports Ltd | Arts & recreation | 1998 |
| Tilgate Spark Ltd | Wholesale & retail | 2024 |
| Tiltwood (North) Management Company Limited | Households | 2020 |
| Tiltwood (South) Management Company Limited | Other services | 2021 |
| Timbertech (PPS) Limited | Manufacturing | 2013 |
| Time for YOU (Brighton & Sussex) Ltd | Administrative & support | 2022 |
| Time for YOU Cleaning Surrey South East Ltd | Administrative & support | 2024 |
| Time OFF Events Limited | Hospitality | 2019 |
| TIME4AI Ltd | Education | 2026 |
| Timeless Creatives Ltd | Professional & scientific | 2024 |
| Timeoff Rentals Limited | Real estate | 2023 |
| Tina Cleaning Ltd | Administrative & support | 2017 |
| Tinsley Close Management Limited | Households | 1998 |
| Tintin Chef on Wheels Ltd | Wholesale & retail | 2020 |
| Tiriparwendo Private Limited | Health & social care | 2022 |
| TISHO7909 Ltd | Transport & logistics | 2019 |
| Titan Excel Limited | Wholesale & retail | 2025 |
| Tivoli Building Services Limited | Construction | 2006 |
| TJ Gatwick Tours Ltd | Transport & logistics | 2021 |
| TJ Onyx Services Limited | Professional & scientific | 2023 |
| TJD Grab Services Limited | Water & waste | 2016 |
| TJM Fire Safety Ltd | Public administration | 2026 |
| TK London Aura Ltd | Wholesale & retail | 2026 |
| TKS Catering Ltd | Hospitality | 2019 |
| TLB Deliveries Ltd | Transport & logistics | 2025 |
| TLC (Southern) Limited | Wholesale & retail | 1990 |
| Tlem Fine Ltd | Information & communication | 2018 |
| Tlem Properties Ltd | Real estate | 2023 |
| Tllc Wholesale Limited | Wholesale & retail | 2020 |
| TLM Logistics Limited | Transport & logistics | 2025 |
| Tlprints Ltd | Wholesale & retail | 2020 |
| TLT Care Limited | Health & social care | 2024 |
| TM Safety & Transport Solutions Ltd | Transport & logistics | 2023 |
| TMA Global Ltd | Transport & logistics | 2010 |
| Tmaccounts Ltd. | Professional & scientific | 2015 |
| TMR Consult Ltd | Information & communication | 2020 |
| TMS General Building Limited | Construction | 2024 |
| TMT Clearance Ltd | Water & waste | 2020 |
| TN Alton Ltd | Hospitality | 2026 |
| TN Housing Ltd | Real estate | 2026 |
| TNC Group Coffee Ltd | Hospitality | 2023 |
| TNG Transport Ltd | Transport & logistics | 2018 |
| TNS IT Solutions Ltd | Information & communication | 2025 |
| TO Physiotherapy Ltd | Health & social care | 2013 |
| Today's Africa CIC | Wholesale & retail | 2023 |
| Todo Clean Ltd | Administrative & support | 2021 |
| Toga Training Limited | Transport & logistics | 2015 |
| Tollgate Dental Care Limited | Health & social care | 2010 |
| Tollgate Place Management Company Limited | Households | 2004 |
| TOM Bagshaw Associates Ltd | Professional & scientific | 2011 |
| Tomas Refurbishments Ltd | Households | 2019 |
| Tones Paintshop Ltd | Construction | 2024 |
| Tonics Hair Limited | Other services | 2016 |
| Tony Alan Recruitment Ltd | Administrative & support | 2012 |
| Toogood Industrial Limited | Manufacturing | 2003 |
| Toolbox Holding Ltd | Financial services | 2017 |
| Tooth Smart Dental Care Limited | Health & social care | 2010 |
| Top 2 Bottom Property Maintenance Limited | Construction | 2019 |
| Top Cuts (Tracy) Limited | Other services | 2026 |
| Top Dealz RH UK Ltd | Wholesale & retail | 2023 |
| Top Notch Carpentry Contractors Ltd | Construction | 2020 |
| Topcoin UK Buy & Earn Ltd | Wholesale & retail | 2023 |
| Topflight CS Ltd | Transport & logistics | 2006 |
| Topflight Steels Limited | Construction | 2010 |
| Tops Pizza Catering Limited | Hospitality | 2017 |
| Torana Trading Limited | Transport & logistics | 2025 |
| Torch Holdings Co | Administrative & support | 2024 |
| Torchsound Properties Limited | Administrative & support | 1981 |
| Torin Limited | Manufacturing | 1919 |
| Torin Sifan Limited | Manufacturing | 2002 |
| Torquez Ltd | Wholesale & retail | 2024 |
| Torrent Pharma (UK) Ltd | Wholesale & retail | 2010 |
| Total Fleet Solutions Limited | Professional & scientific | 2020 |
| Total FM Support and Advisory Ltd | Professional & scientific | 2026 |
| Total Requirements Management Ltd | Information & communication | 2014 |
| Total Support Solutions Limited | Information & communication | 1998 |
| Total Works Solutions Limited | Construction | 2026 |
| Totally Mint Condition Cleaning Ltd | Administrative & support | 2025 |
| Totallygonkers Ltd | Administrative & support | 2022 |
| Totton Dental Care Limited | Health & social care | 2011 |
| Tour Help Group Ltd | Administrative & support | 2023 |