| Top Gear (Bridport) Limited | Wholesale & retail | 2004 |
| Top Gear (International Holdings) Ltd | Financial services | 2017 |
| Total Contract Carpenters Limited | Construction | 2001 |
| Touch of Mythos Limited | Hospitality | 2021 |
| Toucies Limited | Wholesale & retail | 2013 |
| Townsend Therapy Ltd | Health & social care | 2013 |
| Trade Works Telecommunication Ltd | Information & communication | 2025 |
| Traditional Stanbool Barber Ltd | Other services | 2024 |
| Train Natural Limited | Professional & scientific | 2017 |
| Tratteon Engineering Ltd | Financial services | 2025 |
| Tratteon Ltd | Financial services | 2023 |
| Travel BUG Ltd | Households | 2024 |
| Traymade Limited | Hospitality | 1990 |
| Trelayne Limited | Professional & scientific | 2013 |
| Tremgo Holdings Limited | Real estate | 2019 |
| Trevassack Marsh Digital Ltd | Information & communication | 2024 |
| Tribe Hair and Beauty Ltd | Other services | 2022 |
| Trident Advisory Group Ltd | Administrative & support | 2025 |
| Trinity Care & Support 24/7 Limited | Health & social care | 2023 |
| Trinity ST Christmas Trees Ltd | Wholesale & retail | 2020 |
| Triple SC & MN Walker Holdings Ltd | Construction | 2023 |
| Tristan G Murless Limited | Construction | 2001 |
| Tristan Town Stays Ltd | Real estate | 2025 |
| Truffle UK Limited | Wholesale & retail | 1999 |
| Trumpet Gold UK Ltd | Agriculture & fishing | 2024 |
| Trustpoint Digital Health Ltd | Information & communication | 2026 |
| Tsar Training Limited | Professional & scientific | 2006 |
| TSR Moto Ltd | Extraterritorial | 2024 |
| TT Plumbing and Heating Weymouth Limited | Construction | 2022 |
| Tudas Consulting Ltd | Extraterritorial | 2021 |
| Tudor Rose Masonry and Conservation Ltd | Manufacturing | 2013 |
| Tudorose GB Limited | Administrative & support | 1996 |
| Tuks a WEY Limited | Administrative & support | 2010 |
| Turner Associates Survey & Design Limited | Professional & scientific | 2015 |
| Turner Building Design Limited | Professional & scientific | 2002 |
| Turner Digital Media Ltd | Information & communication | 2018 |
| Turrell Limited | Construction | 1989 |
| Turton Street Flats Limited | Households | 2008 |
| Twenty Twenty Developments Limited | Real estate | 2016 |
| Twin Cliff Developments Ltd | Construction | 2025 |
| Two Harbours Healthcare Limited | Health & social care | 2014 |
| UDL Security Limited | Administrative & support | 2014 |
| UK Landlords Group Limited | Administrative & support | 2023 |
| Ukplumbers Limited | Agriculture & fishing | 2023 |
| Ultimate Roofing (South West) Limited | Construction | 2012 |
| Ultrawey Ltd | Real estate | 2022 |
| Umbrellarz Limited | Wholesale & retail | 2018 |
| Unbearable Design Ltd | Professional & scientific | 2018 |
| Uncle Michael Limited | Wholesale & retail | 2004 |
| Uniswell Ltd | Professional & scientific | 2024 |
| Unity Dorset Limited | Health & social care | 2013 |
| Unorthodoxmindsetretreats Ltd | Hospitality | 2025 |
| Upstairs Downstairs Cafe Ltd | Hospitality | 2012 |
| Upton Glen Limited | Construction | 2004 |
| Upwater Property Limited | Real estate | 2019 |
| Upwey Marine Consultants Limited | Administrative & support | 2008 |
| Upwey Motors Limited | Wholesale & retail | 2008 |
| Urban Mobile Limited | Wholesale & retail | 2019 |
| Urban Top Ltd | Wholesale & retail | 2022 |
| V.H-P Dorset Limited | Health & social care | 2025 |
| V.M.T Portland Ltd | Arts & recreation | 2020 |
| Vandals at Work Limited | Administrative & support | 2025 |
| Vanguard Engineering Design Limited | Professional & scientific | 2024 |
| Vanstones Cookers Limited | Wholesale & retail | 2002 |
| Vape D'Ami Limited | Wholesale & retail | 2020 |
| Vaughans Bistro Weymouth Limited | Hospitality | 2016 |
| VEB Lettings Ltd | Real estate | 2024 |
| Venture Away Music Limited | Arts & recreation | 2016 |
| Verena Consulting Ltd | Professional & scientific | 2021 |
| Verena Holdings Ltd | Financial services | 2022 |
| Verena Ltd | Real estate | 2018 |
| Versatile Bathrooms and Tiles Limited | Construction | 2024 |
| VH Electrical Limited | Construction | 2002 |
| Videowithollie Ltd | Information & communication | 2025 |
| Vinders Limited | Public administration | 2014 |
| Vine Mews Management Limited | Households | 2024 |
| Vines House Parfum Ltd | Manufacturing | 2019 |
| Viney Bridge Mills Heritage Limited | Construction | 2022 |
| Vintage Carp Fishing Tackle Limited | Wholesale & retail | 2019 |
| VIP Carp Holidays Ltd | Administrative & support | 2021 |
| Virtuocial Limited | Professional & scientific | 2023 |
| Virtus Event Production Ltd | Information & communication | 2024 |
| Vision Decor Limited | Construction | 2004 |
| Viva Flame Limited | Hospitality | 2023 |
| Vivid Commercial Interiors Ltd | Administrative & support | 2003 |
| VLC Communications Ltd | Information & communication | 2012 |
| Voltawood Limited | Households | 1988 |
| Vulcan Health and Safety Limited | Public administration | 2023 |
| W H Developments Dorset LLP | | 2021 |
| W Ronald Landscapes Limited | Administrative & support | 2014 |
| W&T Autosmart Ltd | Wholesale & retail | 2022 |
| W. ASH Plumbing,Heating & GAS Ltd | Construction | 2019 |
| W. Hicks Enterprises Limited | Transport & logistics | 2022 |
| W. Taylor and Co. Limited | Real estate | 1986 |
| W.C.P.P. Ltd | Construction | 2016 |
| Waddon Professional Services Ltd | Administrative & support | 2022 |
| Wafflicious (Weymouth) Ltd | Hospitality | 2020 |
| Wafflicious Ltd | Hospitality | 2021 |
| Walpole Court Weymouth Limited | Households | 1995 |
| Walter George Dickson Limited | Households | 2024 |