| Targett Chemist Limited | Wholesale & retail | 1999 |
| Tasolutionsuk Limited | Information & communication | 2024 |
| Tattooma Ltd | Arts & recreation | 2021 |
| Taxi Marshall Limited | Transport & logistics | 2014 |
| Taxi Rentals Holdings Ltd. | Transport & logistics | 2016 |
| Taylex Power Limited | Construction | 2021 |
| Taylor Burton Electrical Limited | Construction | 2015 |
| Taylor Elevator Services Ltd | Manufacturing | 2025 |
| Taylor Stanley Lifts Limited | Manufacturing | 2024 |
| Taylor Technology Systems Limited | Administrative & support | 2011 |
| Taylorburton Homes Limited | Real estate | 2021 |
| Taylored Construction Solutions (Kent) Limited | Professional & scientific | 2025 |
| Taylormade Interpreting Limited | Professional & scientific | 2017 |
| Taylorview Limited | Real estate | 2014 |
| Tayyar Catering Limited | Hospitality | 2023 |
| TB Innovest Ltd | Construction | 2025 |
| TBE by M Limited | Other services | 2025 |
| TCG Paradise Ltd | Wholesale & retail | 2024 |
| Tcmd Electrical Limited | Manufacturing | 2019 |
| TDA Decs Ltd | Construction | 2017 |
| TDM Enterprise Group Limited | Hospitality | 2023 |
| TDN Project Consultants Ltd | Construction | 2023 |
| TDW Group Limited | Administrative & support | 2020 |
| Teachtotop Group Limited | Education | 2025 |
| Team IT Training Limited | Information & communication | 2015 |
| Team JW Gyms Limited | Administrative & support | 2018 |
| Team JW Training Ltd | Administrative & support | 2024 |
| Team PIE Limited | Professional & scientific | 2007 |
| Teapot Cafe (Romford) Ltd | Administrative & support | 2009 |
| Teasemedia Limited | Information & communication | 2003 |
| Tech and Print Ltd | Manufacturing | 2026 |
| Tech Car Clinic Limited | Wholesale & retail | 2023 |
| Tech Rendering Limited | Construction | 2022 |
| Techcom Enterprise Ltd | Information & communication | 2015 |
| Technautica Ltd | Information & communication | 2025 |
| Technic Interiors Ltd | Construction | 2014 |
| Technical Engineering Solutions Limited | Professional & scientific | 2016 |
| Technically Elevator Services Limited | Manufacturing | 2026 |
| Techniical Engineering Group Limited | Administrative & support | 2022 |
| Techniical Limited | Administrative & support | 2022 |
| Teemo Group Ltd | Wholesale & retail | 2018 |
| Temple Levy Properties Limited | Professional & scientific | 2007 |
| Tenarts Building Limited | Construction | 2023 |
| Tendax Ltd | Hospitality | 2022 |
| Terra Marketing Limited | Wholesale & retail | 1987 |
| Terraqua Limited | Professional & scientific | 2004 |
| Terri Leary Limited | Administrative & support | 2017 |
| Terry Waite Investments Limited | Administrative & support | 2007 |
| TES Consultancy Ltd | Administrative & support | 2023 |
| Test Runner Consulting Limited | Information & communication | 2009 |
| Testmatch Limited | Professional & scientific | 1999 |
| Tettmar Water and GAS Limited | Construction | 2023 |
| Textured European Finishes Limited | Wholesale & retail | 1972 |
| TFJ GAS & Heating Ltd | Construction | 2024 |
| TG Plumbing Ltd | Construction | 2025 |
| TH3PROC3$$ Ltd | Wholesale & retail | 2025 |
| Thai Healing Ltd | Administrative & support | 2020 |
| Thai Serenity Ltd | Health & social care | 2026 |
| Thames Electrical Holdings Limited | Financial services | 2023 |
| Thames Electrical Supplies Ltd | Wholesale & retail | 2015 |
| Thanet Build Development Limited | Construction | 2017 |
| Thanet Build Limited | Construction | 2023 |
| Thanet Build Property Limited | Real estate | 2023 |
| THE 400 Studio Limited | Information & communication | 2019 |
| THE AD Construction Group Limited | Professional & scientific | 2002 |
| THE Adminity Projects Ltd | Administrative & support | 2026 |
| THE Apple Tree (Cakes) Ltd | Hospitality | 2013 |
| THE Ashcott Inn Ltd | Administrative & support | 2024 |
| THE ASS Group Limited | Construction | 2008 |
| THE Avenues Trust Group | Health & social care | 1999 |
| THE BBQ Barn Ltd | Wholesale & retail | 2012 |
| THE Beard of Attraction Ltd | Professional & scientific | 2018 |
| THE Beauty Rooms (London) Ltd | Administrative & support | 2009 |
| THE Bexley Clinic Limited | Health & social care | 2014 |
| THE Black Network Group Ltd | Professional & scientific | 2019 |
| THE Blend Edit Ltd | Wholesale & retail | 2022 |
| THE Bolthole Micropub Limited | Hospitality | 2019 |
| THE Bridal Beauty Festival Limited | Administrative & support | 2019 |
| THE Bucklands Lodges Ltd | Administrative & support | 2024 |
| THE Bull Bowling Garden Limited | Administrative & support | 2024 |
| THE Butcher's SON Ltd | Wholesale & retail | 2016 |
| THE Butter Suite Ltd | Wholesale & retail | 2026 |
| THE Centre for Making Things Better Ltd | Administrative & support | 2009 |
| THE Chelsea Flower School Ltd | Wholesale & retail | 2025 |
| THE Chestnuts (Bromley) Management Company Limited | Households | 1988 |
| THE Chestnuts Freehold Limited | Households | 2018 |
| THE Chevenings Management Company Limited | Households | 1990 |
| THE Chiswick Electrician Limited | Administrative & support | 2010 |
| THE Chore Concierge Ltd | Administrative & support | 2026 |
| THE Chunky Teapot Limited | Hospitality | 2024 |
| THE Class House Limited | Education | 2025 |
| THE Coffee MAN Limited | Wholesale & retail | 2014 |
| THE Cognitive Room Ltd | Health & social care | 2025 |
| THE Conscious Archive Limited | Wholesale & retail | 2026 |
| THE Cotswolds Property Company Limited | Real estate | 2023 |
| THE Crew Experience (Beckenham) Limited | Professional & scientific | 2013 |
| THE Crew Expo Limited | Other services | 2024 |
| THE Crystal Valley London Ltd | Wholesale & retail | 2022 |
| THE Curiosity Carnival Limited | Administrative & support | 2025 |
| THE CUT Male Grooming Limited | Other services | 2021 |