| Taverns by Taylor Limited | Hospitality | 2025 |
| Tavola DI Famiglia Osteria Limited | Hospitality | 1999 |
| Tax Island Ltd | Professional & scientific | 2019 |
| Taylor & FOX Ltd | Hospitality | 2019 |
| Taylor Automotive Engineering Limited | Professional & scientific | 2019 |
| Taylor Berry Limited | Information & communication | 2022 |
| Taylor COX Associates Limited | Professional & scientific | 2009 |
| Taylor Grace Ltd | Health & social care | 2010 |
| Taylor Michael Limited | Real estate | 2024 |
| Taylor Scaffold Ltd | Construction | 2025 |
| Taylormade Carpentry Limited | Construction | 1997 |
| Taylors Beauty Group Ltd | Other services | 2026 |
| Tazpoint Limited | Information & communication | 2024 |
| TB Kitchens & Carpentry Limited | Manufacturing | 2025 |
| TBG Fusion Limited | Administrative & support | 2018 |
| TBG Harmony Resources Ltd | Administrative & support | 2018 |
| TBR Property Management Ltd | Real estate | 2024 |
| Tbrar Roofing Ltd | Construction | 2020 |
| TCM IP Services Limited | Information & communication | 2020 |
| Tdah Services Limited | Professional & scientific | 2026 |
| Tdhc Heating Limited | Construction | 2017 |
| TDS London Limited | Information & communication | 2019 |
| Tea for Two Films Ltd | Information & communication | 2023 |
| Teachallaboutit Ltd. | Education | 2019 |
| Teak Ventures Limited | Extraterritorial | 2007 |
| Team Liquid Enterprises (UK) Ltd | Arts & recreation | 2021 |
| Team Miles Ltd | Professional & scientific | 2019 |
| Team Royall Ventures Ltd | Information & communication | 2025 |
| Teamgb Holdings Ltd | Other services | 2021 |
| Teamrev Ltd | Information & communication | 2023 |
| Teamwork Homes Limited | Real estate | 2015 |
| Teamwork Properties Limited | Real estate | 2004 |
| Teamyo Ltd | Other services | 2019 |
| Teaseme Limited | Wholesale & retail | 2015 |
| TEB Services Limited | Construction | 2025 |
| TEC Container Solutions Limited | Extraterritorial | 2015 |
| TEC Projects Ltd | Construction | 2009 |
| Tech FIX LAB Limited | Other services | 2018 |
| TECH75 Limited | Information & communication | 2009 |
| Technical Solutions Audio Visual Limited | Administrative & support | 2009 |
| Technilink Data Limited | Information & communication | 1998 |
| Technologies and Solutions Limited | Information & communication | 2009 |
| Tecnet Consultancy Ltd | Professional & scientific | 2017 |
| Tecnet Utilities Limited | Extraterritorial | 2021 |
| Tectonic Analysis Limited | Other services | 1998 |
| Tectonic Media Limited | Information & communication | 2025 |
| TEE Project Services Ltd | Professional & scientific | 2023 |
| TEKCOR4 Limited | Information & communication | 2023 |
| TEKCOR4 Trustees Limited | Financial services | 2023 |
| Tekla Solutions Ltd | Professional & scientific | 2023 |
| Teknotek Limited | Professional & scientific | 1990 |
| Telefonica Digital Limited | Information & communication | 2011 |
| Telefonica Germany Holdings Limited | Information & communication | 2012 |
| Telefonica O2 Holdings Limited | Information & communication | 2004 |
| Telefonica O2 UK Limited | Information & communication | 2001 |
| Telefonica UK Holdings Limited | Information & communication | 1999 |
| Telepathic Limited | Professional & scientific | 1992 |
| Telescope Creative Limited | Arts & recreation | 2011 |
| Telligo UK Limited | Administrative & support | 2008 |
| Telljo Limited | Information & communication | 2017 |
| Telonexus Limited | Agriculture & fishing | 2003 |
| Tempada Ltd | Wholesale & retail | 2022 |
| Temper Films Ltd | Information & communication | 2020 |
| Temperature Applied Sciences Limited | Manufacturing | 1987 |
| Temple Marine Ltd | Financial services | 2020 |
| TEN Tigers Studio Limited | Information & communication | 2011 |
| TEN10 Life Limited | Financial services | 2021 |
| Tender, Love and Clean Ltd | Administrative & support | 2024 |
| Tennis Brothers Ltd | Information & communication | 2016 |
| Tennyson House RTM Company Ltd | Professional & scientific | 2012 |
| Tente Limited | Professional & scientific | 2012 |
| Tentmax Hire Ltd | Other services | 2025 |
| Tern Restaurants Ltd | Hospitality | 2023 |
| Terrasight AI Ltd | Information & communication | 2025 |
| Tesla Health Ltd | Professional & scientific | 2017 |
| Tesseract Investments Limited | Real estate | 2020 |
| Tessychuks Ltd | Health & social care | 2020 |
| Testemp Limited | Manufacturing | 1965 |
| Testmouse Productions Ltd | Information & communication | 2020 |
| Teville Limited | Real estate | 2023 |
| Texas Pizza Ltd | Hospitality | 2021 |
| Texel Engineering Ltd | Professional & scientific | 2016 |
| Teza Holdings Limited | Financial services | 2024 |
| TGM Materials Ltd | Wholesale & retail | 2024 |
| Thai Stirfry Icecream Ltd | Manufacturing | 2023 |
| Thames Publishing Services Limited | Information & communication | 2010 |
| Thanescroft FIC Limited | Financial services | 2024 |
| Thank Collagen Limited | Wholesale & retail | 2021 |
| That Glam Bar Ltd | Other services | 2019 |
| That Glam LAB Ltd | Other services | 2024 |
| That's Entertainment! Media & Events Ltd | Administrative & support | 2022 |
| That's Showbiz Ltd | Arts & recreation | 2019 |
| Thatcher Hobbs Langridge LLP | | 2013 |
| Thats HOW WE Roll Ltd | Construction | 2018 |
| Thats What SHE Made Ltd | Wholesale & retail | 2025 |
| THE 14 Sackville Road (Hove) Company Limited | Households | 1996 |
| THE Academy for Business Solutions Limited | Professional & scientific | 2023 |
| THE Academy World Limited | Administrative & support | 2024 |
| THE Accounting Workshop Ltd | Professional & scientific | 2018 |
| THE Adur and Worthing Business Partnership | Administrative & support | 1997 |