| Telos Blockchain Solutions Ltd | Information & communication | 2019 |
| Telos Healthcare Limited | Health & social care | 2024 |
| TEM Foods NH Limited | Hospitality | 2024 |
| Tembe Trading Ltd | Wholesale & retail | 2020 |
| Temenos Associates Ltd | Professional & scientific | 2016 |
| Templar Associates Ltd | Information & communication | 2021 |
| Templar UK Properties Limited | Real estate | 2023 |
| Templars 84 Ltd | Real estate | 2019 |
| Templars Management Group Ltd | Real estate | 2020 |
| Temple AV Limited | Other services | 2018 |
| Temple Foods Limited | Wholesale & retail | 2019 |
| Templebell Limited | Information & communication | 1996 |
| Temples Corporation Limited | Hospitality | 2019 |
| Templeton Consultants Limited | Information & communication | 1995 |
| Templeton Legal Services Ltd | Professional & scientific | 2020 |
| Templewood (Ealing) Limited | Households | 1969 |
| Templin Limited | Real estate | 1999 |
| Tempo Mechanical Ltd | Construction | 2016 |
| Tempting Recruitment Solutions Limited | Professional & scientific | 2018 |
| Tempus TEN (Management) Limited | Real estate | 2004 |
| TEN TEN Developments Ltd | Construction | 2021 |
| TEN Zero Limited | Other services | 2004 |
| Tenavik Technologies Ltd | Information & communication | 2022 |
| TENCO1 Limited | Professional & scientific | 2023 |
| Tenderleaf Properties Limited | Real estate | 2017 |
| Tenmax Limited | Information & communication | 2022 |
| Tennent Homes 2019 Limited | Real estate | 2019 |
| Tennisnuts Limited | Wholesale & retail | 2007 |
| Tenolol Limited | Administrative & support | 1999 |
| Tenwell Innovations Limited | Administrative & support | 2015 |
| Tenx Strategy Ltd | Professional & scientific | 2025 |
| TEO Construct Services Ltd | Construction | 2019 |
| TEO Interiors Limited | Construction | 2019 |
| TEP 1988 Management Company Limited | Real estate | 1994 |
| Teper Limited | Information & communication | 2015 |
| TEQ Choice Limited | Information & communication | 2017 |
| Teqnologix Ltd | Construction | 2017 |
| Tequila Wharf RTM Company Limited | Households | 2018 |
| Tera Consulting Limited | Information & communication | 2005 |
| Terea Properties Ltd | Construction | 1999 |
| Teresa Pinto Fashion & Design Ltd | Wholesale & retail | 2023 |
| Teresa's Mobile Homes Limited | Hospitality | 2022 |
| Teri Asees Ltd | Wholesale & retail | 2024 |
| Termarvol Limited | Real estate | 2016 |
| Termhouse (Hendon Park Mansions) Management Limited | Households | 1976 |
| Terra Firma Foods Ltd | Wholesale & retail | 2022 |
| Terra Kanso Limited | Construction | 2025 |
| Terra Nova (Kenton) Limited | Real estate | 2018 |
| Terra Nova (Pinner) Limited | Real estate | 2018 |
| Terrafirma Immigration Limited | Professional & scientific | 2009 |
| Terravolt Energy Ltd | Construction | 2026 |
| Terry & Stephens Limited | Construction | 2008 |
| Terry Russell Limited | Professional & scientific | 2024 |
| Tesaa Properties Ltd | Households | 2024 |
| Tesaal Impex Ltd | Wholesale & retail | 2025 |
| Test Equipment Asset Management Limited | Professional & scientific | 2006 |
| Tetbury Industrial Estate Limited | Real estate | 2022 |
| Tethys Europe Ltd | Information & communication | 2007 |
| Tex-Mex Burger Ltd | Hospitality | 2023 |
| Texstyle & Co (UK) Limited | Wholesale & retail | 2019 |
| Teya Construction Ltd | Construction | 2016 |
| Tezaur Folcloric CIC | Other services | 2023 |
| TF Foods Limited | Hospitality | 2019 |
| TFB Limited | Hospitality | 2001 |
| TFM 89 Lighting Limited | Construction | 2021 |
| TFS Accounts and Tax Services Limited | Professional & scientific | 2025 |
| TG Associates Limited | Professional & scientific | 2011 |
| TGA Utilities Ltd | Construction | 2026 |
| TGC Exchange Ltd | Financial services | 2020 |
| TGE Elegance Ltd | Health & social care | 2023 |
| TGG Commercial Ltd | Real estate | 2022 |
| TGL Holdings Limited | Financial services | 2019 |
| TGN Capital Ltd | Wholesale & retail | 2017 |
| TGS Building Ltd | Construction | 2019 |
| TGS Estate Limited | Real estate | 2020 |
| TGS Retail Limited | Wholesale & retail | 2023 |
| TH Engineering Solutions Limited | Professional & scientific | 2025 |
| TH Marketing Limited | Professional & scientific | 2022 |
| TH Prime Clean Ltd | Administrative & support | 2026 |
| Thai Bite Catering Ltd | Hospitality | 2022 |
| Thai Food Express Limited | Hospitality | 2005 |
| Thai Haven Limited | Other services | 2018 |
| Thai Spa Aylesbury Ltd | Other services | 2025 |
| Thakar Commercial Properties Ltd | Real estate | 2025 |
| Thakar Investments Ltd | Real estate | 2022 |
| Thaleia Care Homes Ltd | Health & social care | 2026 |
| Thame Road Haddenham Limited | Households | 1992 |
| Thames Dismantling Limited | Construction | 2006 |
| Thames Enterprise (UK) Limited | Wholesale & retail | 2002 |
| Thames Medics Limited | Health & social care | 2024 |
| Thames Pharma Ltd | Wholesale & retail | 2025 |
| Thames Pro Heating Ltd | Construction | 2023 |
| Thames Property Services Limited | Real estate | 2019 |
| Thames Rental Ltd | Administrative & support | 2026 |
| Thames Stockholding Ltd | Other services | 2023 |
| Thameside Developments Limited | Households | 2009 |
| Thami & Theni Ltd | Real estate | 2026 |
| Than & Siva Ltd | Financial services | 2025 |
| Thangaat Events Ltd | Arts & recreation | 2025 |
| Thank-Aks Ltd | Wholesale & retail | 2023 |