| Susan Cross Financial Services Ltd | | 1988 |
| Swanage Railway Company Limited | Transport & logistics | 1979 |
| Swansea Meat Trader Limited | Real estate | 1987 |
| Sweet House Bournemouth Limited | Hospitality | 2023 |
| Swift Signs Weymouth LLP | | 2002 |
| System Mentor Limited | Information & communication | 1992 |
| Systems Hitech Ltd | Information & communication | 2025 |
| T & R Direct Ltd | Financial services | 2003 |
| T F Builders Limited | Administrative & support | 2003 |
| T Fraser Building Limited | Construction | 2007 |
| T. Ensor & SON (Dorchester) Limited | Other services | 1994 |
| T. Ensor & SON Limited | Wholesale & retail | 1993 |
| T. Speer Ltd | Construction | 2002 |
| Takdeer Ltd | Hospitality | 2024 |
| Tasnim's Kitchen Ltd | Hospitality | 2026 |
| Tasty House Ltd | Hospitality | 2019 |
| Tate Transport Limited | Transport & logistics | 2005 |
| Tattersalls Management (Bournemouth) Ltd. | Real estate | 1997 |
| Taunton PPP Limited | Real estate | 2002 |
| Tax Facilities Limited | Financial services | 1997 |
| Taylor Made (UK) Limited | Real estate | 2007 |
| TCT Consultancy Ltd. | Information & communication | 2000 |
| Tcvs Limited | Wholesale & retail | 2005 |
| TDS Construction Ltd | Construction | 1998 |
| Team Burn Ltd | Information & communication | 2019 |
| Technic Engineering Limited | Manufacturing | 2007 |
| Teezel Ltd | Construction | 2014 |
| Tempogrand Limited | Wholesale & retail | 1982 |
| Tempus Homes Limited | Real estate | 2001 |
| Texmain Limited | Information & communication | 1991 |
| Thai and PIE Limited | Hospitality | 2026 |
| THE 6 Alderbrook Road Residents Association Limited | Real estate | 1996 |
| THE 7 Warren Road Management Company Limited | Hospitality | 1995 |
| THE Advertising Hub Ltd | Information & communication | 2006 |
| THE Air Conditioning Agency Limited | Energy | 1993 |
| THE Anglebury House Limited | Hospitality | 2003 |
| THE Bakehouse (Brock) Limited | Manufacturing | 2007 |
| THE Beeches (Poole) Ltd. | Administrative & support | 1997 |
| THE Beehive Management Company (Christchurch) Limited | Households | 2011 |
| THE Bored Gamer Store & Cafe Limited | Wholesale & retail | 2022 |
| THE Bryanston Society Limited | Other services | 1998 |
| THE Bythesea Road Management Company Ltd | Real estate | 2018 |
| THE Catholic Schools Trust | Education | 1986 |
| THE Chantry Freehold Limited | Households | 2002 |
| THE Decorative Fabrics Gallery Limited | Professional & scientific | 2001 |
| THE Deeds Depository Limited | Administrative & support | 2007 |
| THE Design Unit Limited | Professional & scientific | 2003 |
| THE Ferns (Ferndown) Management Limited | Households | 2003 |
| THE Fine Food Company UK Limited | Wholesale & retail | 2003 |
| THE Fridge Fine Foods Limited | Wholesale & retail | 2004 |
| THE Gardens Group Limited | Wholesale & retail | 1998 |
| THE Grove Car Sales Dorchester Ltd | Wholesale & retail | 2023 |
| THE Incredible Expanding Box Limited | Information & communication | 2006 |
| THE Kutting Station Limited | Other services | 2002 |
| THE Learning Quest Limited | Administrative & support | 2005 |
| THE Maitlands Management Limited | Households | 2007 |
| THE Mess Dress Limited | Wholesale & retail | 2001 |
| THE Old Guest House Limited | Hospitality | 2002 |
| THE Old Slaughterhouse Limited | Construction | 2019 |
| THE Priest's House Museum Trust | Arts & recreation | 1998 |
| THE Regent (Christchurch) Limited | Arts & recreation | 2000 |
| THE Royal Signals Museum | Arts & recreation | 2007 |
| THE Screen Talent Agency Ltd | Administrative & support | 2005 |
| THE Sherborne School Foundation | Education | 1998 |
| THE Swanage Railway Trust | Arts & recreation | 2000 |
| THE Tiger Inn Limited | Hospitality | 2000 |
| THE Towans Freehold Company Limited | Real estate | 2001 |
| THE Write Choice Limited | Information & communication | 2004 |
| Thefamilyshoppers Ltd | Wholesale & retail | 2026 |
| Thejdhgroup Ltd | Wholesale & retail | 2023 |
| Therapy Listening Counselling Ltd | Health & social care | 2025 |
| Third Code Ltd | Wholesale & retail | 2023 |
| Thomas & Woolven Limited | Professional & scientific | 1999 |
| Thompson Valves Limited | Manufacturing | 1993 |
| Thornhill Farm (Dorset) Limited | Agriculture & fishing | 2005 |
| Thunderbolt Boat Charters Ltd. | Arts & recreation | 2007 |
| Tilleys Limited | Wholesale & retail | 2003 |
| Tilleys Wessex Riders Limited | Education | 2003 |
| Timoszenko Limited | Wholesale & retail | 2025 |
| TLS Group Holdings Limited | Manufacturing | 2008 |
| Toft Mansions Property Investments Limited | Households | 2001 |
| Toller Down Farms Limited | Real estate | 1996 |
| Tony Smith Kitchens & Appliances Ltd | Construction | 2003 |
| Topal Bookkeeping Services Ltd | Professional & scientific | 2019 |
| Total Programme Control Limited | Professional & scientific | 2007 |
| Tough Plant Hire Limited | Administrative & support | 2007 |
| Trade Tanks Limited | Professional & scientific | 2005 |
| Trap Hairly Ltd | Other services | 2019 |
| Travel West Inns Limited | Hospitality | 1973 |
| TRC Capital Limited | Real estate | 2020 |
| Treasurer Ltd | Hospitality | 2023 |
| Tree Structures Ltd | Manufacturing | 2021 |
| Trevor Coffen Construction Limited | Administrative & support | 2005 |
| Trinity Consultancy Limited | Information & communication | 1999 |
| Triple G 21 Limited | Construction | 2021 |
| Trumprelay Limited | Transport & logistics | 1987 |
| TSH Mgmt Ltd | Hospitality | 2025 |
| Tulloch & Maslin Limited | Agriculture & fishing | 1946 |
| Turn of the Century Productions Limited | Information & communication | 1999 |
| Turning Point School of Motoring Limited | Professional & scientific | 2006 |