| TMB Homes Limited | Real estate | 2020 |
| TMN Services Limited | Manufacturing | 2016 |
| Toby Levy Celebration Catering Limited | Hospitality | 2024 |
| Toddler Sense (Essex) Limited | Education | 2014 |
| Tonia HR Consulting & Mediation Solution Ltd | Administrative & support | 2023 |
| Total Sensory Ltd | Extraterritorial | 2010 |
| Totalsensoryuk Ltd | Manufacturing | 2022 |
| Tower Environmental Services Ltd | Other services | 2021 |
| TPJ Controls Ltd | Professional & scientific | 2017 |
| Trade Angel Ltd | Professional & scientific | 2023 |
| Trademark Digital Ltd | Professional & scientific | 2024 |
| Trafalgar Green Residents Association Limited | Households | 2000 |
| Tramezzini LDN Ltd | Construction | 2019 |
| Transport More Goods TMG Ltd | Transport & logistics | 2023 |
| Travel Assistance International Limited | Administrative & support | 1996 |
| Travers Bikes Limited | Manufacturing | 2013 |
| Treble Blue Limited | Information & communication | 2005 |
| Trendly AI Ltd | Information & communication | 2025 |
| Tributary Consultants Limited | Professional & scientific | 2015 |
| Trim Consultancy Limited | Information & communication | 1994 |
| Trinity Investment Properties Limited | Real estate | 2024 |
| Triny Cars Limited | Transport & logistics | 2022 |
| Triple Two Tattoos Ltd | Arts & recreation | 2024 |
| Trouvaille Travel Limited | Administrative & support | 2016 |
| Truth Fitness Limited | Health & social care | 2024 |
| TSW Property Services Ltd | Construction | 2025 |
| Tudor Air-Conditioning Limited | Manufacturing | 1979 |
| TUK TUK Fareast Rochford Ltd | Hospitality | 2023 |
| Tuning Solutions Ltd | Construction | 2015 |
| Turner & Pooch Ltd | Agriculture & fishing | 2011 |
| Turner Bros (Rochford) Limited | Construction | 2002 |
| Turners Furries Ltd | Other services | 2017 |
| Twelve Month Hill Solar Farm Limited | Construction | 2021 |
| Twenty Twenty Doors Limited | Construction | 2019 |
| TWENTYSIX19 Developments Ltd | Real estate | 2025 |
| TWENTYSIX19 Ltd | Administrative & support | 2014 |
| Twinnys Boxing Limited | Arts & recreation | 2022 |
| Two Rivers Research and Management Limited | Real estate | 1999 |
| TWR Watch Repairs Ltd | Other services | 2007 |
| Tyde's Creations Limited | Wholesale & retail | 2020 |
| U K Systems Limited | Construction | 2007 |
| U&M Investments Ltd | Real estate | 2025 |
| UK Heat Limited | Construction | 2019 |
| UK Medical Screening Ltd | Health & social care | 2026 |
| UK Town Maps Ltd | Professional & scientific | 2010 |
| Umacs Limited | Professional & scientific | 2007 |
| Uncle Tom's Service Station & MOT Centre Limited | Wholesale & retail | 2014 |
| Union Hire Ltd | Administrative & support | 2015 |
| Unite Construction Solutions Limited | Construction | 2014 |
| Urban INK (Brentwood) Limited | Other services | 2007 |
| Urgentprinting.London Limited | Administrative & support | 2008 |
| Usedcarsdelivered.Com Limited | Wholesale & retail | 2022 |
| Utilitymove Ltd | Real estate | 2016 |
| V & B Holdings Limited | Professional & scientific | 2015 |
| V Betts Consultancy Limited | Professional & scientific | 2018 |
| Vaelo Limited | Professional & scientific | 2026 |
| Vale Utilities Ltd | Construction | 2015 |
| Valentina Hall Limited | Financial services | 2024 |
| Valerie Wilkins Limited | Information & communication | 2022 |
| Van Sales Essex Limited | Wholesale & retail | 2026 |
| Vandenberg Golf Ltd | Arts & recreation | 2014 |
| Vandenberg Travel Ltd | Administrative & support | 2024 |
| Vanilla Goose Limited | Wholesale & retail | 2016 |
| Vantage Board Advisors Limited | Administrative & support | 2023 |
| VBI Holdings Limited | Financial services | 2019 |
| Vedant Consulting Services Limited | Information & communication | 2013 |
| Velmos Ltd | Real estate | 2024 |
| Venner Consultancy Ltd | Administrative & support | 2023 |
| Venthams Trustees Limited | Professional & scientific | 1986 |
| Venton Properties Ltd | Real estate | 2019 |
| Ventura Technology Solutions Limited | Information & communication | 2011 |
| Vercroft Limited | Wholesale & retail | 1999 |
| Veritas College International | Other services | 1992 |
| Vermuteria Holdings Limited | Extraterritorial | 2022 |
| Vermuteria Limited | Administrative & support | 2018 |
| Verrier Consulting Limited | Professional & scientific | 2024 |
| Versatile Recovery Limited | Transport & logistics | 2021 |
| Very Cherry Ltd | Real estate | 2019 |
| VFT Management Co Limited | Real estate | 2002 |
| Victual Group Ltd | Hospitality | 2017 |
| Vintage Classic Restorations Ltd | Manufacturing | 2024 |
| Virascape Ltd | Other services | 2025 |
| Viridis Spa Ltd | Other services | 2026 |
| Visage Medispa Ltd | Other services | 2024 |
| Viscourt Consulting Limited | Administrative & support | 2017 |
| Viscourt Limited | Administrative & support | 1987 |
| Visionary Dining Limited | Administrative & support | 2025 |
| VM Projects Limited | Construction | 2022 |
| Voiceway Limited | Professional & scientific | 2016 |
| Volbroker.Com Limited | Professional & scientific | 1999 |
| VT Consulting Limited | Information & communication | 2005 |
| Vtac Technical Limited | Professional & scientific | 2019 |
| VW MAD UK Limited | Wholesale & retail | 2022 |
| W & K (1997) Ltd | Real estate | 1963 |
| W D Greenhill & Co Limited | Other services | 2020 |
| W.H.Whittingham & Sons Limited | Wholesale & retail | 1945 |
| Wallace Mackenzie Limited | Other services | 2026 |
| Walley Limited | Extraterritorial | 2014 |
| Walman House Management Co. Ltd. | Households | 1999 |
| Warm-A-Lite Windows Limited | Construction | 2026 |