| Tacky Central Limited | Agriculture & fishing | 2018 |
| Tahdah Limited | Arts & recreation | 2021 |
| Tahi UK Ltd | Wholesale & retail | 2022 |
| Tailcomb Limited | Information & communication | 2012 |
| Tailored Life Limited | Administrative & support | 2025 |
| Tailored Pathways Ltd | Health & social care | 2023 |
| Tailored Transitions Ltd | Health & social care | 2015 |
| Take 2 Events Ltd | Information & communication | 2011 |
| Talahasse Limited | Wholesale & retail | 1958 |
| Tallandbridge Ltd | Real estate | 2004 |
| Tamasi Ltd | Construction | 2017 |
| Tangible Investments Limited | | 1987 |
| Tattico Management Consulting Ltd | Financial services | 2019 |
| TCA Ventures Limited | Professional & scientific | 2013 |
| Tclc Properties Limited | Construction | 2017 |
| TCR Construction Ltd | Construction | 2026 |
| TDP QA Specialist Ltd | Information & communication | 2025 |
| TDR Electrical Ltd | Construction | 2025 |
| TDR Property Solutions Limited | Real estate | 2026 |
| Tdta Investments Limited | Manufacturing | 2019 |
| Team Evenflow Ltd | Arts & recreation | 2020 |
| TEC Capital Management Ltd | Wholesale & retail | 2023 |
| Technology Transfer Solutions Limited | Professional & scientific | 2020 |
| Technosys Limited | Information & communication | 2002 |
| Ted's Sheds (UK) Limited | Construction | 2007 |
| TEI the Capital Ltd | Wholesale & retail | 2020 |
| Telematiques Global Ltd | Information & communication | 2020 |
| Temco D.B.S. (UK) Limited | Professional & scientific | 2022 |
| Temptation (Gifts) Limited | Wholesale & retail | 1988 |
| Temptation (Holdings) Ltd | Financial services | 2025 |
| Tensile Spectrum Ltd | Professional & scientific | 2025 |
| TEO & Andy Ltd | Transport & logistics | 2017 |
| Tera Shingaar Ltd | Other services | 2024 |
| Terra Firma Ground Investigation Limited | Construction | 2003 |
| Thaison Consulting Ltd | Information & communication | 2023 |
| Thaison Investment Ltd | Real estate | 2017 |
| Thakar Trading Ltd | Wholesale & retail | 2018 |
| Thames Valley Coffee Ltd | Manufacturing | 2024 |
| Thamesis Asset Management Limited | Real estate | 2009 |
| That'Ll DO PIG Limited | Information & communication | 2013 |
| That's Figures Ltd | Professional & scientific | 2024 |
| THE 50PLUS Organisation Limited | Administrative & support | 1998 |
| THE Bell Cafe Corner & Restaurant Limited | Hospitality | 2022 |
| THE Bertie & Baird Collective Ltd | Information & communication | 2026 |
| THE Burger Box Holdings Ltd | Professional & scientific | 2021 |
| THE Chiltern Hills Academy | Education | 2011 |
| THE Chiltern Society | Other services | 2001 |
| THE Coffee Edit With Gather by Gray Limited | Hospitality | 2026 |
| THE Communication Solution Limited | Professional & scientific | 2007 |
| THE Crew Café Limited | Hospitality | 2021 |
| THE Diet LAB Ltd | Health & social care | 2025 |
| THE DRY Aged Meat Company Ltd | Manufacturing | 2020 |
| THE DRY Ageing Meat Company Ltd | Manufacturing | 2020 |
| THE Executive Change Partnership Limited | Professional & scientific | 2011 |
| THE Extra Inch Podcast Limited | Information & communication | 2023 |
| THE Fencing Firm Ltd | Construction | 2022 |
| THE Fishandchips One Ltd | Hospitality | 2019 |
| THE Garnett Foundation Ltd. | Professional & scientific | 2003 |
| THE Green Building Company Ltd | Real estate | 2000 |
| THE Habit Ilfracombe Ltd | Hospitality | 2016 |
| THE HER Solidarity CIC | Professional & scientific | 2025 |
| THE Hilltop Group Limited | Administrative & support | 2009 |
| THE Innovation Farm & Associates Ltd | Professional & scientific | 2023 |
| THE Innovation Farm LP | | 2016 |
| THE IR Group Limited | Administrative & support | 2021 |
| THE Junction (Chesham) Limited | Hospitality | 2019 |
| THE Kokum Limited | Hospitality | 2026 |
| THE Leadership Bridge Limited | Professional & scientific | 2025 |
| THE London Motion Control Company Limited | Information & communication | 2014 |
| THE Loved LUX Ltd | Wholesale & retail | 2023 |
| THE M-Word Ltd | Professional & scientific | 2026 |
| THE Malaika Foundation | Health & social care | 2021 |
| THE Marchhare Limited | Professional & scientific | 2019 |
| THE Meat Hook Limited | Wholesale & retail | 2018 |
| THE Metatech Group Limited | Information & communication | 2018 |
| THE Minted Edge Ltd | Information & communication | 2024 |
| THE Mitre PUB Limited | Wholesale & retail | 2017 |
| THE Mortgages & Protection Center Limited | Financial services | 2018 |
| THE Nail Drop Ltd | Wholesale & retail | 2019 |
| THE Old Crown (Marshfield) Limited | Households | 2021 |
| THE Old Curiosity Shop Ltd | Wholesale & retail | 2010 |
| THE Original Biltong Company Ltd | Administrative & support | 2016 |
| THE Pool Girl Ltd | Administrative & support | 2023 |
| THE Printed Wallpaper Company Ltd | Professional & scientific | 2012 |
| THE Printed Window Film Company Limited | Professional & scientific | 2012 |
| THE Probate Network Ltd | Professional & scientific | 2020 |
| THE Psychology Network Limited | Health & social care | 2021 |
| THE Rail Team Ltd | Construction | 2020 |
| THE Shoe Shack (TSS) Limited | Wholesale & retail | 2020 |
| THE Sign Place Ltd | Wholesale & retail | 2019 |
| THE Sign Place West London Limited | Wholesale & retail | 2023 |
| THE Sound Forge Limited | Information & communication | 2023 |
| THE Squad Group Ltd | Public administration | 2023 |
| THE Stove Store Supplies Chesham Limited | Wholesale & retail | 2017 |
| THE Surrey Landscaper Limited | Construction | 2019 |
| THE Theatre Shed Limited | Arts & recreation | 2005 |
| THE Unit Driver Ltd | Information & communication | 2014 |
| THE Unorthodox Kitchen Ltd | Hospitality | 2015 |
| THE Very Cloudy Company Limited | Information & communication | 2025 |
| THE Waste Monkeys Limited | Water & waste | 2022 |