| THE Retreat (Christchurch) Management Company Limited | Households | 2006 |
| THE Safety Coach Academy Limited | Professional & scientific | 2007 |
| THE Showhouse Co. Ltd | Professional & scientific | 2016 |
| THE Skip Factory Limited | Manufacturing | 2009 |
| THE Snug TAP House Limited | Hospitality | 2020 |
| THE Sock Drop Co. Limited | Manufacturing | 2025 |
| THE SUP Store Ltd | Wholesale & retail | 2019 |
| THE Tidy Crew Limited | Administrative & support | 2025 |
| THE Travel Franchise Limited | Administrative & support | 2012 |
| THE Two Sawyers Pett Ltd | Hospitality | 2023 |
| THE Vertex Connection Limited | Professional & scientific | 2025 |
| THE Willow Garden (Fowey) Limited | Real estate | 2018 |
| THE Window & Conservatory Centre Ltd. | Construction | 2019 |
| THE Window Centre Ltd | Construction | 2021 |
| Thebennets Limited | Financial services | 2014 |
| Themusicclub CIC | Arts & recreation | 2025 |
| Theophany Ltd | Wholesale & retail | 2021 |
| Thepmuclinic Ltd | Other services | 2024 |
| Thermal & Acoustic Solutions Limited | Administrative & support | 2007 |
| Thesolarcompany Ltd | Construction | 2023 |
| Think Tangible Ltd | Information & communication | 2024 |
| Thirteen Mudeford Development Limited | Real estate | 2025 |
| Thomas Pardy Removals & Storage Ltd | Transport & logistics | 2021 |
| Thomas Tripp Events Limited | Hospitality | 2024 |
| Thorney Hill Community Centre Association Ltd | Health & social care | 2002 |
| Thousand Hands Ltd | Information & communication | 2018 |
| Tide Accounting Ltd | Professional & scientific | 2011 |
| Tide Therapy Ltd | Health & social care | 2026 |
| Tiger Global Limited | Wholesale & retail | 2008 |
| Tigerstorm Limited | Information & communication | 2024 |
| Till Properties Limited | Real estate | 2021 |
| Tiltonbrook Limited | Financial services | 2019 |
| TIM Bremner Coaching Ltd | Health & social care | 2025 |
| TIM Moore Limited | Wholesale & retail | 2015 |
| Timeframe Solutions Limited | Information & communication | 2016 |
| Timeless Retail Limited | Wholesale & retail | 2014 |
| Tiogo Limited | Wholesale & retail | 2004 |
| TJ Crane Parts Ltd | Wholesale & retail | 2022 |
| TJL Distribution Limited | Wholesale & retail | 2017 |
| TLS Fire & Security LLP | | 2010 |
| Toku Property Management Ltd | Real estate | 2024 |
| TOM Harris Estates Limited | Real estate | 2020 |
| TOM Robinson Electrical Ltd | Construction | 2019 |
| TOM Whiteley Limited | Construction | 2019 |
| Tommy's Plumbing & Heating Limited | Construction | 2020 |
| Tonchev Engineering Ltd | Administrative & support | 2016 |
| Tony FOX Limited | Information & communication | 2019 |
| Tony Hairdressing Limited | Professional & scientific | 2002 |
| Tony Robinson Projects Ltd | Construction | 2017 |
| Top Mark Windscreens Ltd | Wholesale & retail | 2015 |
| Torchcc Ltd | Wholesale & retail | 2023 |
| Toredo Property Ltd | Hospitality | 2025 |
| Total Distribution and Retail Solutions Ltd | Information & communication | 2001 |
| Total Reward Services Limited | Professional & scientific | 2021 |
| Totally Moving Limited | Information & communication | 2013 |
| Tour DE Forest Ltd | Wholesale & retail | 2025 |
| TPM Cleaning & Facilities Ltd | Administrative & support | 2017 |
| Trade Rush Limited | Wholesale & retail | 2018 |
| Trade Tech Consulting Limited | Information & communication | 2025 |
| Trade-Secret.App Ltd | Professional & scientific | 2024 |
| Trademark 25 Limited | Wholesale & retail | 2009 |
| Trades Marketing Ltd | Extraterritorial | 2025 |
| Trans - YAR Ltd | Health & social care | 2015 |
| TRE Kronor Fika Ltd | Other services | 2021 |
| Treenspirit Limited | Manufacturing | 2022 |
| Tregoad Holiday Park Limited | Hospitality | 2020 |
| Trevlaura Limited | Wholesale & retail | 2020 |
| Trevor Ames Limited | Other services | 2002 |
| Trewly Ltd | Information & communication | 2026 |
| Triangle Headlease Ltd | Real estate | 2022 |
| Tribe Alternative Stage School CIC | Education | 2022 |
| Trident Training and Consultancy Ltd | Health & social care | 2019 |
| Trident USV Services Ltd | Professional & scientific | 2025 |
| Tring Care Dorset Limited | Health & social care | 2024 |
| Triple G Developments Limited | Construction | 2014 |
| Triple W Software Ltd | Information & communication | 2009 |
| Truefruitcolour Ltd | Wholesale & retail | 2023 |
| Truelife Science Consulting Ltd | Professional & scientific | 2023 |
| Trust IT Group LLP | | 2024 |
| Trustus Trades Limited | Wholesale & retail | 2024 |
| TTL Digital Ltd | Information & communication | 2016 |
| Tubular Techniques 3D Ltd | Real estate | 2010 |
| Tuckton Foot Clinic LLP | | 2022 |
| Tudor Tree Specialists Ltd | Agriculture & fishing | 2019 |
| Turbo Dynamics Limited | Manufacturing | 1992 |
| Turkish BBQ Kitchen Ltd | Hospitality | 2022 |
| Turnack Limited | Construction | 1977 |
| Tutography Limited | Education | 2023 |
| Tutoring by the C Ltd | Education | 2022 |
| TWC1978 Ltd | Construction | 2020 |
| Twenty Residential Design Ltd | Professional & scientific | 2017 |
| Two Caribou Limited | Professional & scientific | 2019 |
| Twynham Carpentry Limited | Manufacturing | 2008 |
| Twynham Church for the Community | Education | 2007 |
| Twynham Learning | Education | 2011 |
| Twynham Manor Residents Association Limited | Households | 1996 |
| Twynham Motor Services Limited | Wholesale & retail | 2008 |
| Tymar Services Limited | Professional & scientific | 1998 |
| Tyres Gogo Ltd | Wholesale & retail | 2026 |
| UCT Electrical Limited | Education | 2008 |