| Tamerton Management Ltd | Households | 1991 |
| Tamerton Property Limited | Real estate | 2026 |
| Tamerton Village Stores Ltd | Wholesale & retail | 2016 |
| Tammy Vehicles Ltd | Wholesale & retail | 2025 |
| TAN LAB Plymouth Ltd | Other services | 2020 |
| TAN Properties Limited | Construction | 2009 |
| Tangible Solutions Limited | Professional & scientific | 2006 |
| Tanglin 2000 Limited | Real estate | 1998 |
| Tanners Holdings Limited | Professional & scientific | 2005 |
| Tanners Restaurants Limited | Extraterritorial | 2002 |
| Tanning Booths Limited | Other services | 2011 |
| Tantalus Technologies Limited | Information & communication | 2010 |
| Tapemate UK Ltd | Wholesale & retail | 2024 |
| Tapson Residents Limited | Households | 1985 |
| Tarabut Gateway UK Limited | Information & communication | 2020 |
| Tarantula Digital Ltd | Information & communication | 2026 |
| Tarc Property Ltd | Real estate | 2017 |
| Tarc Solutions Ltd | Manufacturing | 2012 |
| Taseen Cuisine Limited | Hospitality | 2015 |
| Tashi Delek Limited | Manufacturing | 2023 |
| Task Force Distribution Limited | Wholesale & retail | 2011 |
| Tasty Express Limited | Hospitality | 2018 |
| Tasty Kitchen (SW) Ltd | Hospitality | 2025 |
| Tasty Terra Ltd | Wholesale & retail | 2024 |
| Tasty Town Food Ltd | Hospitality | 2024 |
| Tatam Plate’S Ltd | Manufacturing | 2023 |
| Tatam Properties Ltd | Real estate | 2025 |
| Tattoo Topia Ltd | Other services | 2022 |
| Taurus Contracts Limited | Construction | 2018 |
| Taurus Events Limited | Administrative & support | 2016 |
| Taurus Projects Ltd | Professional & scientific | 2019 |
| Tavistock Building Solutions Limited | Construction | 2023 |
| Tavistock Fasteners Ltd | Wholesale & retail | 2024 |
| Tavistock House Freehold Ltd | Hospitality | 2015 |
| Tavistock House Management Co Ltd | Professional & scientific | 2015 |
| Tavistock Motor Company (Devon) Limited | Wholesale & retail | 2016 |
| Tavistock Roofing Solutions Limited | Construction | 2017 |
| Tavistock Salvage Centre Limited | Other services | 2003 |
| Tavistock Service Station Limited | Wholesale & retail | 2025 |
| Taviton Ltd | Professional & scientific | 2017 |
| Tavysoft Limited | Information & communication | 2003 |
| Tax Agency Ltd | Professional & scientific | 2023 |
| Tax Angels Limited | Professional & scientific | 1995 |
| Taxi Services (Plymouth) Limited | Transport & logistics | 2011 |
| Taxibank Limited | Arts & recreation | 2001 |
| Taylor Consulting (FMG) Limited | Professional & scientific | 2022 |
| Taylor Made Developments (Gosport) Ltd | Construction | 2016 |
| Taylor Morgan Engineering Ltd | Professional & scientific | 2025 |
| Taylormade Poultry Ltd | Wholesale & retail | 2012 |
| Taypra Ltd | Information & communication | 2026 |
| Tbhbeb Property Investments Ltd | Real estate | 2025 |
| TBP Plumbing & Heating Ltd | Construction | 2024 |
| Tbrb Events Ltd | Arts & recreation | 2019 |
| TBS Hardware Limited | Wholesale & retail | 2023 |
| TC ACC Ltd | Real estate | 2025 |
| TC Bricklaying (SW) Ltd | Construction | 2026 |
| TC Bromhead Limited | Professional & scientific | 2010 |
| TC Carpentry & Developments Limited | Construction | 2026 |
| TC Executive Hire Ltd | Transport & logistics | 2026 |
| TC Photography Plymouth Ltd | Professional & scientific | 2025 |
| TC23 Limited | Wholesale & retail | 2023 |
| TC4LIFE Ltd | Health & social care | 2022 |
| TCG Management Limited | Administrative & support | 2019 |
| Tcmk Media Ltd | Information & communication | 2018 |
| TCT Marine Limited | Manufacturing | 2022 |
| TDB Ltd | Professional & scientific | 2026 |
| Tea & BUN Limited | Hospitality | 2019 |
| Tea Tree Houses Limited | Hospitality | 2024 |
| Teachhealth Ltd | Education | 2025 |
| Team Conqueror (Holdings) Limited | Construction | 2012 |
| Team Conqueror Limited | Administrative & support | 2006 |
| Team Tilley Limited | Real estate | 2022 |
| Team Tobin Limited | Administrative & support | 2026 |
| TEAM3 Ltd | Information & communication | 2021 |
| Teamwork Security and Training Services Limited | Education | 2022 |
| Teba Services Ltd | Construction | 2021 |
| TEC Construction (Holdings) Limited | Construction | 1997 |
| TEC Group (Holdings) Limited | Professional & scientific | 2012 |
| TEC Packaging Services Limited | Wholesale & retail | 2012 |
| TEC Plus Snap Ltd | Wholesale & retail | 2026 |
| Tecalemit Workshop Equipment Ltd | Manufacturing | 2024 |
| Tech Surveys UK Ltd | Real estate | 2025 |
| Tech Team Repairs Ltd | Other services | 2013 |
| Techconnext Ltd | Professional & scientific | 2024 |
| Techlan Holdings Ltd | Professional & scientific | 2019 |
| Technical Marine Supplies Limited | Professional & scientific | 2014 |
| Technical Marketing Services Limited | Professional & scientific | 2019 |
| Technical MEP Support Ltd | Professional & scientific | 2025 |
| Technical Partners (UK) Limited | Information & communication | 2018 |
| Tectona Trust Ltd | Health & social care | 2009 |
| TED Design Limited | Information & communication | 2011 |
| TED Properties Limited | Hospitality | 2015 |
| Teddy's Village Ltd | Hospitality | 2024 |
| Tedson Holdings Limited | Information & communication | 2019 |
| TEE & JAY Ltd | Transport & logistics | 2021 |
| TEE Homes Ltd | Real estate | 2026 |
| Teesside Property Agent Limited | Real estate | 2016 |
| Tekrix Ltd | Wholesale & retail | 2026 |
| Tekum Limited | Information & communication | 2019 |
| Telebizz Holdings Limited | Financial services | 2015 |