| Tantrum Boutiques Ltd | Other services | 2019 |
| Tanush Software Limited | Information & communication | 2014 |
| Tanyard Lane Ltd | Hospitality | 2021 |
| Targeted Strategies Limited | Professional & scientific | 2006 |
| Tarzina Ltd | Wholesale & retail | 2025 |
| Task Concepts Limited | Construction | 2006 |
| Taste Catering Limited | Hospitality | 2023 |
| TAU Limited | Real estate | 2021 |
| Taubase Limited | Information & communication | 2023 |
| Taurak Holdings Limited | Financial services | 2016 |
| Taurak IT Limited | Information & communication | 2016 |
| Tava Services Limited | Professional & scientific | 2010 |
| Tax & Accounting Services Ltd | Professional & scientific | 2020 |
| Tax Affinity Management Ltd | Manufacturing | 2022 |
| Taxteam Partners Limited | Professional & scientific | 2018 |
| Taylor Biden Limited | Construction | 2020 |
| Taylored Electrical Solutions Ltd | Construction | 2025 |
| TB Plumbing & Construction Ltd | Construction | 2026 |
| TB Property Solutions Ltd | Construction | 2021 |
| Tbar Services Ltd | Wholesale & retail | 2023 |
| Tchibo Coffee International Limited | Wholesale & retail | 1963 |
| Tcsingh Limited | Professional & scientific | 2026 |
| TDK Dalston Retail Limited | Manufacturing | 2023 |
| TDK Dalston Wholesale Limited | Manufacturing | 2014 |
| TDK Harringay Retail Limited | Wholesale & retail | 2021 |
| TDK Holdings Limited | Financial services | 2023 |
| TDK Site 3 Takeaway Limited | Manufacturing | 2024 |
| Tdki Services Limited | Construction | 2012 |
| TDM Marine Limited | Arts & recreation | 2005 |
| Teaceylan Ltd | Wholesale & retail | 2018 |
| Teach Edge Software Ltd | Information & communication | 2011 |
| Teamwork & Maintenance Ltd | Construction | 2023 |
| Tech Database Solutions Limited | Information & communication | 2011 |
| Tech Help Limited | Other services | 2022 |
| Tech Talent Global Limited | Information & communication | 2024 |
| Tech Talent Hub Ltd | Administrative & support | 2023 |
| Technical Building Design Limited | Construction | 2002 |
| Technical Essentials (London) Limited | Information & communication | 2025 |
| Technology Transport Solutions Ltd | Extraterritorial | 2016 |
| Technoras Ltd | Wholesale & retail | 2022 |
| Techtalent Resourcing Limited | Administrative & support | 2023 |
| Techtonic Trade Ltd | Wholesale & retail | 2024 |
| Techtonix Group Ltd | Information & communication | 2026 |
| Tecnomarine Limited | Manufacturing | 2016 |
| Teecee Electrical Ltd | Construction | 2016 |
| Tekno Zone Ltd | Wholesale & retail | 2014 |
| Tekton Building Services Ltd | Construction | 2023 |
| Telegate Consulting Limited | Professional & scientific | 2012 |
| Telling Photography Limited | Professional & scientific | 2009 |
| Templemere Trading Company Ltd | Wholesale & retail | 2017 |
| Tempo and Time Ltd | Wholesale & retail | 2015 |
| TEN Opal Square Ltd | Professional & scientific | 2022 |
| Tend Legal Ltd | Professional & scientific | 2020 |
| Tenniethresh Ltd | Manufacturing | 2023 |
| Tennyson Court ( Hindhead ) Management Company Limited | Households | 2006 |
| Tenscare Trustee Limited | Professional & scientific | 2017 |
| Teresa Kiely Limited | Education | 2019 |
| Terrakay Transport Solutions Limited | Transport & logistics | 2024 |
| Terrestrial Trades Ltd | Wholesale & retail | 2023 |
| Tessa Helen Aesthetics Limited | Health & social care | 2024 |
| Tezgel & Sons Ltd | Hospitality | 2023 |
| TFA Management Limited | Administrative & support | 2018 |
| TFS Jewellers Ltd | Wholesale & retail | 2024 |
| TGB Insurance Services Limited | Financial services | 1984 |
| TGB Vehicle Contracts Limited | Wholesale & retail | 1986 |
| Tgfm Limited | Manufacturing | 2005 |
| Thai Cafe Ltd | Hospitality | 2019 |
| Thai Taste Epsom Ltd | Hospitality | 2025 |
| Thames (Ditton) Marina Limited | Extraterritorial | 1957 |
| Thames Street Properties Limited | Real estate | 2017 |
| Thames Systems Limited | Information & communication | 1996 |
| Thatmakers Limited | Information & communication | 2020 |
| Thaya Ltd | Real estate | 2014 |
| Thba Holdings Ltd | Financial services | 2024 |
| Thba Ltd | Professional & scientific | 2024 |
| THE 1875 Society Ltd | Arts & recreation | 2026 |
| THE 2MCS Properties Limited | Real estate | 2023 |
| THE Accounting House Company Ltd | Professional & scientific | 2007 |
| THE Adventure Network Limited | Administrative & support | 2018 |
| THE AGG Syndicate Limited | Information & communication | 2017 |
| THE AIM Team Limited | Manufacturing | 2023 |
| THE Alpine Bakehouse Limited | Manufacturing | 2025 |
| THE Ameca Trust | Other services | 2007 |
| THE Answer Limited | Professional & scientific | 2015 |
| THE B Street Deli Limited | Wholesale & retail | 2013 |
| THE Back and Health Clinic Ltd | Health & social care | 2002 |
| THE Baking Tree Ltd | Manufacturing | 2012 |
| THE Baring Hall Hotel Ltd | Hospitality | 2020 |
| THE Barnes Fund Trustee Limited | Other services | 2017 |
| THE Beach Group (Surrey) Limited | Other services | 2019 |
| THE Beauty Lounge (Stoneleigh) Limited | Administrative & support | 2018 |
| THE Bertrand's Kitchen Limited | Hospitality | 2019 |
| THE Bespoke Designer Ltd | Professional & scientific | 2024 |
| THE Big Blue Print Company Limited | Manufacturing | 2007 |
| THE Black Card Company Ltd | Wholesale & retail | 2020 |
| THE Blonde Collective Ltd | Education | 2025 |
| THE Blooms Boutique Ltd | Wholesale & retail | 2018 |
| THE Bridge (Farnham) Limited | Households | 2021 |
| THE Britain-China Local Economic and Trade Cooperation Promotion Association Ltd | Professional & scientific | 2017 |
| THE Brow Convenience Super Stores Limited | Wholesale & retail | 2012 |