| TAD Property Investments Ltd | Real estate | 2024 |
| Tailor Made Mortgages & Protection Ltd | Financial services | 2020 |
| Tait Aesthetics Limited | Other services | 2026 |
| Taizhou Jabal Mould Co., Ltd | Administrative & support | 2024 |
| Take Away the Payne Ltd | Other services | 2023 |
| Take ME to Candles Limited | Other services | 2021 |
| Takoma Estates 2025 Ltd | Real estate | 2025 |
| Taks Lounge Limited | Professional & scientific | 2021 |
| Talent Bible Limited | Administrative & support | 2026 |
| Tales by Timber Ltd | Manufacturing | 2024 |
| Taoh Limited | Other services | 2013 |
| Tarka Trading Ltd | Wholesale & retail | 2025 |
| Tarzinge UK Ltd | Information & communication | 2018 |
| TAS Solutions (UK) Limited | Extraterritorial | 1996 |
| TAS Solutions Limited | Information & communication | 1994 |
| Taste of Norfolk Limited | Professional & scientific | 2005 |
| Taste of Northamptonshire Limited | Professional & scientific | 2005 |
| Taste of Nottinghamshire Limited | Professional & scientific | 2005 |
| Taste of Oxfordshire Limited | Professional & scientific | 2005 |
| Taste of Rutland Limited | Professional & scientific | 2005 |
| Taste of Scotland Limited | Professional & scientific | 2005 |
| Taste of Shropshire Limited | Professional & scientific | 2005 |
| Taste of Staffordshire Limited | Professional & scientific | 2005 |
| Taste of Suffolk Limited | Professional & scientific | 2005 |
| Taste of Surrey Limited | Professional & scientific | 2005 |
| Taste of Sussex Limited | Professional & scientific | 2005 |
| Taste of Warwickshire Limited | Professional & scientific | 2005 |
| Taste of Westmorland Limited | Professional & scientific | 2005 |
| Taste of Wiltshire Limited | Professional & scientific | 2005 |
| Taste of Worcestershire Limited | Professional & scientific | 2005 |
| Taste of Yorkshire Limited | Professional & scientific | 2005 |
| Tavern Hire Limited | Administrative & support | 1979 |
| Tavern Skips Limited | Extraterritorial | 1988 |
| Tax Consulting Limited | Professional & scientific | 2003 |
| Taylor Construction Plant Limited | Wholesale & retail | 1989 |
| Taylor Finishes Limited | Construction | 2024 |
| Taylormade Films Limited | Information & communication | 2016 |
| TBD Florist Ltd | Wholesale & retail | 2023 |
| TBK Holdings Limited | Transport & logistics | 2003 |
| TC Nails Ltd | Other services | 2025 |
| TCK Property Management Limited | Real estate | 2016 |
| Tcou Group Ltd | Health & social care | 2021 |
| TDR Computers Ltd | Wholesale & retail | 2021 |
| Teacup Ltd | Health & social care | 2025 |
| Teal Court (Maylandsea) Management Company Limited | Households | 1991 |
| Team LB2 Limited | Arts & recreation | 2026 |
| Tec-Supplies Group Limited | Extraterritorial | 2014 |
| Tec-Supplies Kent Ltd | Wholesale & retail | 2022 |
| Tec-Supplies Limited | Wholesale & retail | 1992 |
| Tech Lube Support Limited | Professional & scientific | 2019 |
| Techni-Plas (UK) Limited | Construction | 2007 |
| Technology Consulting Limited | Information & communication | 2020 |
| Tecmasters Security Services Limited | Administrative & support | 2010 |
| Teenage Dirtbag Ltd | Wholesale & retail | 2025 |
| Temme English Basildon Limited | Real estate | 2020 |
| Temme English Lettings & Management Ltd | Real estate | 2018 |
| Temme English Limited | Real estate | 2010 |
| Temme English Maldon Limited | Real estate | 2020 |
| Temporary Water Solutions Limited | Water & waste | 2021 |
| Tempro Ltd | Extraterritorial | 2013 |
| TEN Digit Electronics Ltd | Information & communication | 2016 |
| Tenth Dimension Ltd | Extraterritorial | 2011 |
| Termhouse (Park House) Management Limited | Households | 1977 |
| Terra Meats Ltd | Manufacturing | 2025 |
| Terra Therma Limited | Construction | 2002 |
| Terra Therma Renewables Limited | Construction | 2025 |
| Territory Limited | Information & communication | 2014 |
| Texo Development & Investments Ltd | Real estate | 2020 |
| Texo Scaffolding (London) Ltd | Administrative & support | 2017 |
| TFP (Holdings) Ltd | Financial services | 2020 |
| TFP Financial Planning Ltd. | Financial services | 2012 |
| TGM Electrical Limited | Construction | 2024 |
| Thamesis Consulting Limited | Professional & scientific | 2023 |
| Thaonguyen Ltd | Real estate | 2023 |
| That Lighting Company Ltd | Wholesale & retail | 2021 |
| THE ALE House Limited | Hospitality | 2021 |
| THE Asset Group Ltd | Information & communication | 2024 |
| THE Barges Residents Company Limited | Real estate | 2013 |
| THE Beacon Hill Bunker Co Limited | Real estate | 2010 |
| THE Bell & Olive Ltd | Hospitality | 2019 |
| THE Big Sheep Ltd | Arts & recreation | 2004 |
| THE Blackwater Barge Company Limited | Transport & logistics | 1992 |
| THE Blackwater Clinic Limited | Professional & scientific | 2008 |
| THE Bookie Hunters Ltd | Other services | 2023 |
| THE British HAT Guild | Manufacturing | 2019 |
| THE Bull & Willow Limited | Hospitality | 2016 |
| THE Bull at Great Totham Ltd | Hospitality | 2021 |
| THE Charis Trust | Professional & scientific | 2010 |
| THE Chelmer Blackwater Reserve CIC | Arts & recreation | 2021 |
| THE Clean Leaf Company Limited | Administrative & support | 2025 |
| THE Coaching Chambers Ltd | Education | 2025 |
| THE Colchester Consulting Group Ltd | Education | 2016 |
| THE Courtyard Clinic Property Limited | Real estate | 2022 |
| THE Croft Wfdb Ltd | Hospitality | 2025 |
| THE Crown (Bristol) Limited | Hospitality | 2021 |
| THE Dawn Sailing Barge Trust Limited | Professional & scientific | 1996 |
| THE Dog Club HQ Limited | Financial services | 2026 |
| THE DRY Cleaning Company (Essex) Limited | Other services | 2009 |
| THE Elms Dental Practice Limited | Health & social care | 2006 |
| THE Elms Holding Limited | Financial services | 2014 |