| TR Limited | Extraterritorial | 2007 |
| Trademaster Innovations Ltd | Manufacturing | 2024 |
| Tradetracks Limited | Professional & scientific | 2016 |
| Trailer 8 Ltd | Wholesale & retail | 2025 |
| Tramar Import & Export Services Limited | Wholesale & retail | 2012 |
| Trans Continental Express Ltd | Transport & logistics | 2018 |
| Transdime Technologies Ltd | Professional & scientific | 2010 |
| Trauma Clean 24SEVEN Ltd | Extraterritorial | 2011 |
| Travel With Charles Limited | Administrative & support | 2024 |
| Trencrom Holdings Ltd | Financial services | 2020 |
| Treyford Energy Ltd | Administrative & support | 2020 |
| Tria Sourcing Limited | Manufacturing | 2025 |
| Tribe Training Haverhill Ltd | Arts & recreation | 2021 |
| Tribe Training Saffron Walden Ltd | Arts & recreation | 2021 |
| Tridensa Ltd | Wholesale & retail | 2013 |
| Triform Estates Limited | Real estate | 2025 |
| Triform Properties Limited | Construction | 2011 |
| Trihr Solutions Limited | Administrative & support | 2025 |
| Trinity Managed Services Ltd | Information & communication | 2018 |
| Truckhiato Ltd | Hospitality | 2024 |
| True Companionship Care Givers Solutions Ltd | Health & social care | 2025 |
| True Luxury Gifthaus London Ltd | Wholesale & retail | 2024 |
| Truequest Consultancy Services Limited | Professional & scientific | 2015 |
| TTF Taxation Limited | Professional & scientific | 2015 |
| TTK UK Ltd | Wholesale & retail | 1997 |
| Tubs Limited | Wholesale & retail | 2012 |
| Tudor Park (Saffron Walden) Management Company Limited | Households | 2014 |
| Tugra Barber Ltd | Other services | 2018 |
| Tundra Developments Limited | Construction | 2025 |
| Tuneful Limited | Information & communication | 2023 |
| Tuoc Ltd | Professional & scientific | 2024 |
| Turpin's Indoor Bowling Club Limited | Arts & recreation | 1996 |
| TVZ Limited | Administrative & support | 2010 |
| TW Services (Herts) Ltd | Manufacturing | 2019 |
| TW Visions Ltd | Professional & scientific | 2023 |
| Twenty First Century Properties Limited | Real estate | 1999 |
| Twenty Two Consulting Ltd | Professional & scientific | 2021 |
| Tydeman NAR Ltd | Information & communication | 2025 |
| Tyson Manor Limited | Financial services | 2014 |
| U GOT This Consulting Ltd | Information & communication | 2025 |
| U&G Metal Works Ltd | Manufacturing | 2021 |
| UAG First Advisors Limited | Wholesale & retail | 2025 |
| UGO Scooters Ltd | Administrative & support | 2017 |
| UI Ltd | Extraterritorial | 2009 |
| UK Crushing & Development Limited | Professional & scientific | 2005 |
| UK Grab Hire Limited | Professional & scientific | 2005 |
| UK Wholesale Plants Ltd | Wholesale & retail | 2019 |
| Ultima Business Support Limited | Administrative & support | 2017 |
| Ultimate I.T. Solutions Limited | Information & communication | 1997 |
| Ultimate One Limited | Wholesale & retail | 2015 |
| Umbrella Print Ltd | Information & communication | 2012 |
| UNA Tights Ltd | Wholesale & retail | 2022 |
| Under One Moon Ltd | Manufacturing | 2022 |
| Underwood Clinics Limited | Other services | 2009 |
| Underwood Groundworks Ltd | Construction | 2004 |
| Union PUB Group Ltd | Hospitality | 2019 |
| Uniqua Goods Ltd | Transport & logistics | 2024 |
| Unique Health and Fitness Gym Limited | Arts & recreation | 2020 |
| Uniquely Local Experiences Limited | Wholesale & retail | 2021 |
| Universal Aunts Limited | Other services | 1922 |
| Universal Tiles Limited | Extraterritorial | 2019 |
| Universal Tiling Projects Limited | Construction | 2017 |
| Unknown - Untitled Limited | Professional & scientific | 2024 |
| Upper Westfields Limited | Households | 2009 |
| Upward Design & Marketing Limited | Information & communication | 2014 |
| Upware Marina Limited | Construction | 1966 |
| UQ Limited | Extraterritorial | 2008 |
| Urban Edge Services Ltd | Administrative & support | 2025 |
| Urban ERA Productions Limited | Information & communication | 2011 |
| Urban Landscape Properties Ltd | Real estate | 2024 |
| Urban Larder Cambridge Limited | Hospitality | 2024 |
| Urban Retreat by Acti Labs Ltd | Other services | 2020 |
| Utter East Limited | Information & communication | 2016 |
| UVS UK Limited | Information & communication | 2009 |
| Van Slooten International Limited | Wholesale & retail | 2017 |
| Vance Industries Limited | Wholesale & retail | 2016 |
| Vanishing Twin LLP | | 2022 |
| Vantace Limited | Information & communication | 2026 |
| Various Projects Property Ltd | Construction | 2025 |
| Vault Vermouths Ltd | Manufacturing | 2017 |
| Vciso Consulting Ltd | Extraterritorial | 2020 |
| Vedral Capital Ltd | Professional & scientific | 2024 |
| Venning's Limited | Hospitality | 2026 |
| Venturer Limited | Arts & recreation | 1987 |
| Venue Ventures Limited | Other services | 2012 |
| Verde Tiles Ltd | Wholesale & retail | 2019 |
| Veroli Consulting Limited | Professional & scientific | 2019 |
| Vertical Vineyard Ltd | Agriculture & fishing | 2025 |
| Vespertine Limited | Wholesale & retail | 2023 |
| Vetlig Limited | Wholesale & retail | 2012 |
| Victoria Charles Properties Ltd | Real estate | 2019 |
| Victory Consultants Ltd | Professional & scientific | 2018 |
| Vigilant Aviation Ltd | Administrative & support | 2018 |
| Vigilant Maritime Services Limited | Professional & scientific | 2017 |
| Viking Airport Equipment Ltd | Administrative & support | 2018 |
| Vinery Mews Ltd | Construction | 2017 |
| Vinley Limited | Education | 2005 |
| Vintage Fabrics Aircraft Maintenance (Essex) Ltd | Construction | 2014 |
| Vintage Fabrics Ltd | Manufacturing | 2003 |
| Vinyl MAN Enterprises Ltd | Wholesale & retail | 2023 |