| Timbertop Services (Sidcup) Limited | Construction | 2025 |
| Timbertop Services Limited | Construction | 2000 |
| Timbertops Equestrian Centre Limited | Other services | 2003 |
| Titmuss Window Machinery Ltd | Professional & scientific | 2022 |
| TJE Associates Ltd | Professional & scientific | 2025 |
| TJG Building Services Limited | Construction | 2009 |
| TLC Water Solutions Limited | Construction | 2017 |
| TM Plumbing & Heating Limited | Construction | 2025 |
| Tmlawn Limited | Administrative & support | 2021 |
| TMP Healthcare Limited | Wholesale & retail | 2023 |
| Tokyo Tatemono UK Ltd | Real estate | 2025 |
| TOM Whipps Photography Limited | Professional & scientific | 2014 |
| Tomelis Group Ltd | Professional & scientific | 2025 |
| Tomillie Services Ltd | Construction | 2026 |
| Tomrichi Medical Services Ltd | Health & social care | 2022 |
| Topcook Ltd | Wholesale & retail | 2026 |
| Torbrook Ltd | Construction | 2004 |
| Torr Cooling Solutions Limited | Construction | 2022 |
| Total Engineering & Maintenance Limited | Construction | 2025 |
| Tourlite Design Limited | Arts & recreation | 2018 |
| Towlin Developments Ltd | Real estate | 2025 |
| TR Imaging Ltd | Professional & scientific | 2015 |
| TRA Aneesha Limited | Construction | 2024 |
| Track Communications Limited | Information & communication | 2003 |
| Trade Plumbing Supplies Limited | Wholesale & retail | 2011 |
| Trademark Building Services Limited | Construction | 2013 |
| Transmission Consulting Limited | Professional & scientific | 2022 |
| Travoca Ltd | Wholesale & retail | 2026 |
| Trays Electrical Limited | Administrative & support | 2003 |
| Trev's Beans Limited | Wholesale & retail | 2021 |
| Trevi Construction Ltd | Construction | 2020 |
| Trikleen Limited | Wholesale & retail | 2016 |
| Trilok Limited | Manufacturing | 2009 |
| Trinu Technologies Ltd | Information & communication | 2025 |
| Triple J Trading Limited | Administrative & support | 2023 |
| Triplepm Advisory Ltd | Professional & scientific | 2025 |
| Tripple D International Limited | Professional & scientific | 2017 |
| Troika Solutions Ltd | Construction | 2021 |
| Trojan Roofing & Building Ltd | Construction | 2025 |
| Trovix AI Ltd | Information & communication | 2026 |
| TS Portfolios Limited | Construction | 2024 |
| TS Rope Access Ltd | Administrative & support | 2016 |
| TSA Heating Services Ltd | Administrative & support | 2010 |
| TSH Projects Limited | Construction | 2009 |
| Tshp Property Holdings Limited | Real estate | 2024 |
| TSO Hospitality Ltd | Hospitality | 2026 |
| TT Pony Management Limited | Other services | 2023 |
| TTF London Ltd | Real estate | 2025 |
| TTS Division Ltd | Wholesale & retail | 2025 |
| Tucco Ltd | Professional & scientific | 2022 |
| Tudor Court (Sidcup) RTM Co Ltd | Households | 2019 |
| Tully Carpentry Limited | Construction | 2020 |
| Tunnel Vision Construction Ltd | Construction | 2023 |
| Tutionhut Ltd | Real estate | 2021 |
| TWE Consultancy Limited | Professional & scientific | 2022 |
| TWE Investments Limited | Real estate | 2020 |
| TWH Professional Services Limited | Administrative & support | 2024 |
| Twincoast Limited | Wholesale & retail | 1985 |
| UCA Support Ltd | Other services | 2021 |
| Uchenna Abulume & Associates Ltd. | Health & social care | 2018 |
| UK Admission Service & Training Ltd | Education | 2024 |
| UK Chongqing Business Association | Other services | 2014 |
| UK Lift Repairs Limited | Construction | 2023 |
| Ultimate Flooring Systems Limited | Construction | 2020 |
| Umdc Limited | Hospitality | 2018 |
| Umthi Ltd | Manufacturing | 2022 |
| Umtv Limited | Arts & recreation | 2002 |
| Umtv Studios Limited | Arts & recreation | 2022 |
| Unboxd Properties Ltd | Real estate | 2021 |
| Uncrewed Systems Limited | Information & communication | 2022 |
| Undefinable Living Limited | Professional & scientific | 2023 |
| Undercliffe Residents Association Limited | Households | 1986 |
| Underwood Private Wealth Ltd | Financial services | 2025 |
| Uniglobal Employment Skills Development Limited | Professional & scientific | 2015 |
| Unite Decor Services Ltd | Construction | 2020 |
| United Hurst House Limited | Administrative & support | 1992 |
| Uplift Developments Ltd | Construction | 2022 |
| Upscale Access Ltd. | Construction | 2021 |
| Urban Squid Ltd | Information & communication | 2014 |
| USP Properties Ltd | Construction | 2021 |
| V Pharma Limited | Wholesale & retail | 2012 |
| V-Mic Energy and Lighting Solutions Ltd | Professional & scientific | 2025 |
| V.B.U.S.S.R. Limited | Construction | 1982 |
| Vagon Ltd | Real estate | 2018 |
| Valerio Travel Ltd | Administrative & support | 2017 |
| Valpre Capital DC Greece Finco Limited | Other services | 2026 |
| Valpre Capital DC Greece Limited | Financial services | 2026 |
| Valpre Capital UK Limited | Financial services | 2019 |
| Vanguard Heating Ltd | Construction | 2026 |
| Vaughan King Ltd | Administrative & support | 2025 |
| VC PBSA1 Limited | Financial services | 2024 |
| VC PCL1 Limited | Construction | 2023 |
| VC TKY Limited | Financial services | 2021 |
| Vdubradio Ltd | Information & communication | 2021 |
| Velvet Whip Ltd | Manufacturing | 2026 |
| VER Consultancy Ltd | Professional & scientific | 2019 |
| Verdata Ltd | Professional & scientific | 2021 |
| Veritas Private Wealth Limited | Financial services | 2025 |
| Verma Consultancy Services Limited | Real estate | 2018 |
| Verma Housing Ltd | Real estate | 2024 |