| THE Only Chauffeur Limited | Transport & logistics | 2016 |
| THE Optics Room Ltd | Health & social care | 2022 |
| THE Orchard Exeter Day Nursery Limited | Education | 2026 |
| THE Orchard Hampton Day Nursery Limited | Education | 2023 |
| THE Orchard Kentish Town Day Nursery Limited | Education | 2025 |
| THE Orchard KEW Day Nursery Limited | Education | 2019 |
| THE Organic Pet Food Company Limited | Manufacturing | 2007 |
| THE Outlier Collective Ltd | Professional & scientific | 2022 |
| THE Parry Charitable Foundation | Extraterritorial | 1993 |
| THE Petra & Co(Uk) Ltd | Wholesale & retail | 2025 |
| THE Pink Shop International Limited | Wholesale & retail | 2025 |
| THE Policy Company Limited | Professional & scientific | 2002 |
| THE Policy Organisation Limited | Administrative & support | 2007 |
| THE Portfolio Framework Ltd | Information & communication | 2026 |
| THE Prime Drive Watford Ltd | Wholesale & retail | 2025 |
| THE Resonant Leadership Consultancy Ltd | Professional & scientific | 2026 |
| THE Roof Crew Limited | Construction | 2025 |
| THE Roomstudio Limited | Professional & scientific | 2015 |
| THE Rubber TOE Sneaker Co Ltd | Wholesale & retail | 2024 |
| THE Sacred Seed Ltd | Health & social care | 2025 |
| THE Safety Prism Limited | Professional & scientific | 2024 |
| THE Salon by Jasmine Limited | Other services | 2022 |
| THE Sanctuary Residents Company Limited | Households | 2005 |
| THE Sasta Foundation | Health & social care | 2012 |
| THE Shine Academy Ltd | Education | 2022 |
| THE Skapes International Limited | Administrative & support | 2025 |
| THE Sketch Studio London Limited | Professional & scientific | 2007 |
| THE Software Development Corporation Ltd | Information & communication | 2009 |
| THE Street Food Cafe Ltd | Hospitality | 2026 |
| THE Study School Limited | Education | 1998 |
| THE TAB Renovation Ltd | Construction | 2018 |
| THE Tactic Bike Company Limited | Manufacturing | 1997 |
| THE Tiny Titans Limited | Health & social care | 2024 |
| THE Training Ground (London) Limited | Education | 2025 |
| THE Trust Properties London Ltd | Real estate | 2024 |
| THE Tutor Academy Limited | Education | 2011 |
| THE Vineyard Restaurants Limited | Real estate | 2003 |
| THE Visualiser Limited | Information & communication | 2006 |
| THE W.F.T.G. LLP | | 2003 |
| THE Walpole Street Practice Limited | Health & social care | 2010 |
| THE Wardrobe Edit Limited | Wholesale & retail | 2019 |
| THE Wedding Society Limited | Hospitality | 2023 |
| THE White Canvas Designs Ltd | Information & communication | 2015 |
| THE World Federation of Khoja Shia Ithna-Asheri Muslim Communities Limited | Other services | 2026 |
| THE Wright Key Lettings Ltd | Real estate | 2020 |
| THE £100K Club Ltd | Professional & scientific | 2023 |
| Theatre Crossroads | Arts & recreation | 2001 |
| Thef Joinery Ltd | Construction | 2005 |
| Thekeyguy Ltd | Wholesale & retail | 2022 |
| Thenos Ltd | Professional & scientific | 2011 |
| Thermatron Ltd | Construction | 2021 |
| Thesaemma Ltd | Health & social care | 2021 |
| Theseus Capital Ltd | Financial services | 2022 |
| Thetilescompany Ltd | Wholesale & retail | 2020 |
| Thevsha Ltd | Real estate | 2017 |
| Third Time Properties Ltd | Real estate | 2019 |
| Thirteen Assets Ltd | Real estate | 2023 |
| Thirteen Group Limited | Other services | 2018 |
| Thirteen Property Consultants Limited | Professional & scientific | 2023 |
| This IS Digital.Ink Ltd | Information & communication | 2018 |
| Thistle Imagination Ltd | Other services | 2018 |
| Thomas & Forrest Construction Ltd | Construction | 2019 |
| Thothaal Group Limited | Wholesale & retail | 2005 |
| Thothaal Powergen Ltd | Extraterritorial | 2014 |
| Three Amigos Investments Limited | Real estate | 2021 |
| Three Bears Limited | Professional & scientific | 2025 |
| Three Counties Care Services Ltd | Health & social care | 2008 |
| Three Jewels Limited | Arts & recreation | 2010 |
| Three Ways Properties Limited | Real estate | 2018 |
| THREE9S Talent Limited | Administrative & support | 2024 |
| Thyrvia - Wellness Ltd | Other services | 2025 |
| Tibi Delivery Ltd | Transport & logistics | 2021 |
| Ticket Store Limited | Administrative & support | 2008 |
| Tides Restaurant Limited | Hospitality | 2006 |
| Tidy Money Ltd | Professional & scientific | 2008 |
| Tigo 11 Ltd | Transport & logistics | 2021 |
| Tigris Pharma Limited | Professional & scientific | 2018 |
| Tigris Trading (UK) Limited | Wholesale & retail | 2021 |
| Tilquick Solutions Limited | Information & communication | 2018 |
| Time Investment Management Limited | Real estate | 2011 |
| Timebase Industrial Properties Limited | Professional & scientific | 2013 |
| Timebase Investments Limited | Professional & scientific | 2012 |
| Timeblock Industrial Properties Limited | Professional & scientific | 2013 |
| Timeblock Investments Limited | Professional & scientific | 2012 |
| Timeboard Industrial Properties LLP | | 2013 |
| Timeboard Investments LLP | | 2012 |
| Timeboard IP (Bristol) Limited | Real estate | 2016 |
| Timeboard IP Investments Limited | Real estate | 2016 |
| Timeboard Properties Ltd | Real estate | 2019 |
| Timemoneypatience Ltd | Real estate | 2025 |
| Tina's Nursery Ltd | Health & social care | 2026 |
| Tinley Media Ltd | Information & communication | 2008 |
| Tiny Talk Speech & Language Therapy Limited | Health & social care | 2017 |
| TIP of the Iceberg Limited | Administrative & support | 2010 |
| Tiso Digital Ltd | Professional & scientific | 2024 |
| Titanbase Construction Ltd | Construction | 2026 |
| Tixx Analytics Limited | Information & communication | 2024 |
| Tjay Limited | Wholesale & retail | 2022 |
| TKS Collective Limited | Professional & scientific | 2009 |
| TLB Kitchen Limited | Hospitality | 2022 |