| Threshold Farming Limited | Hospitality | 2025 |
| Thrive Dorset Limited | Arts & recreation | 2025 |
| TIP Top Roofing Ltd | Construction | 2014 |
| Tony Viney Holding Limited | Real estate | 2025 |
| Tornay Court Flats Limited | Households | 2006 |
| Torni Construction Ltd | Construction | 2016 |
| Torro Ventures Ltd | Professional & scientific | 2014 |
| Tournay Limited | Professional & scientific | 2014 |
| Town & Country Laundry Services Limited | Administrative & support | 2017 |
| TPM Supplies Ltd | Administrative & support | 2019 |
| Treasure Masters Limited | Extraterritorial | 1993 |
| Treats@Swanage Ltd | Wholesale & retail | 2023 |
| Trend Trucks Ltd | Wholesale & retail | 2017 |
| Trevor Jones Consulting Ltd | Financial services | 2009 |
| Tribute Automotive Ltd | Wholesale & retail | 2015 |
| Trijon Services Ltd | Construction | 2003 |
| Trix Enterprises Ltd | Hospitality | 2018 |
| Trocadero Flats (Swanage) Limited | Households | 2000 |
| Trueline Roofing Ltd | Construction | 2025 |
| Twerpshed Ltd | Arts & recreation | 2018 |
| Twinseas Engineering Ltd | Agriculture & fishing | 2014 |
| Tyrol Court Limited | Households | 2007 |
| Ulwell Builders Limited | Construction | 2015 |
| Ulwell Park Limited | Hospitality | 2004 |
| Undercovers TV Limited | Information & communication | 2013 |
| Unmanned Aerial Solutions Ltd | Professional & scientific | 2024 |
| V a North & SON Ltd | Agriculture & fishing | 2014 |
| Vanstone Rail Ltd | Construction | 2011 |
| Vantage Yachting Ltd | Administrative & support | 2020 |
| VAS Works Ltd | Wholesale & retail | 2011 |
| VAT Resource Company Limited | Professional & scientific | 2017 |
| Victoria Court (Purbeck) Limited | Households | 2004 |
| Victoria Road Freehold Limited | Real estate | 2013 |
| Vision D&D Ltd | Construction | 2021 |
| Vocation Online Limited | Education | 2004 |
| Vocationally Allsort'D C.I.C. | Wholesale & retail | 2024 |
| Voltaware Limited | Professional & scientific | 2015 |
| Voltaware Services Limited | Professional & scientific | 2015 |
| Voyce Builders Limited | Construction | 2006 |
| Vulcan Commercial Ltd | Real estate | 2019 |
| Vulcan Group Holdings Ltd | Construction | 2019 |
| W F Snook and SON Limited | Construction | 2002 |
| W H Residents Management Company Limited | Households | 2026 |
| Waddlewaddle Ltd | Administrative & support | 2016 |
| Wareham Property Management Limited | Households | 2013 |
| Wareham Roofing and Carpentry Limited | Construction | 2023 |
| Waverley Court (Swanage) Freehold Ltd | Households | 2007 |
| Waverley Court (Swanage) Management Company Limited | Households | 1988 |
| Waves & Whimsy Ltd | Manufacturing | 2024 |
| WCA Management Company Limited | Households | 2003 |
| WE ARE Ampl Ltd | Professional & scientific | 2024 |
| WE Elevate UK Scaffolding Ltd | Construction | 2025 |
| Wessex Court (Management) Company Limited | Households | 1984 |
| Wessex Survey and Design Limited | Professional & scientific | 1994 |
| Wessex Training & Assessment Ltd | Education | 2002 |
| Westover Court (Swanage) Management Company Limited | Households | 1986 |
| White Lines Sunbeds Ferndown Ltd | Other services | 2024 |
| White Lines Sunbeds Ltd | Other services | 2024 |
| Whizzbits Limited | Professional & scientific | 2006 |
| Wilde Home Ltd | Information & communication | 2021 |
| Wilkswood Farm Ltd. | Professional & scientific | 2013 |
| William Keith Limited | Wholesale & retail | 2023 |
| Wilmer Inspection Services Limited | Administrative & support | 2006 |
| Wilmor Ltd | Other services | 2014 |
| Winterborne Zelston Fencing Ltd | Construction | 2000 |
| Winterfold Properties Ltd | Construction | 2023 |
| Wipeout World Ltd | Arts & recreation | 2020 |
| Wmtr Ltd | Hospitality | 2012 |
| Woodrow House Limited | Professional & scientific | 2007 |
| Woodstock Management Company (Swanage) Ltd | Households | 2024 |
| Woodston Resources Limited | Professional & scientific | 2010 |
| Woodtek Ltd | Construction | 2014 |
| Woodyhyde Ltd | Hospitality | 2005 |
| Wooloomooloo Grosvenor Road Limited | Households | 2003 |
| Worcester Lodge (Swanage) Management Company Limited | Households | 1993 |
| Worcester Lodge Limited | Hospitality | 1998 |
| Word Pictures Limited | Professional & scientific | 1990 |
| Wordsworth Court Swanage Limited | Households | 2014 |
| Work Force Staff Solutions Ltd | Administrative & support | 2017 |
| Worth Farm Barns Limited | Households | 2008 |
| Yacht Design Technology Ltd | Manufacturing | 2014 |
| YG Wellbeing Ltd | Wholesale & retail | 2022 |
| Zalman Realty Ltd | Real estate | 2022 |
| Ziggyzag Ltd | Transport & logistics | 2025 |