| Thomson Entertainment Limited | Administrative & support | 2025 |
| Thomson Financial Limited | Professional & scientific | 2020 |
| Thomson Park Car Centre Limited | Wholesale & retail | 2009 |
| Thomson Plumbing & Heating Services Limited | Construction | 2018 |
| Thomson Price Limited | Other services | 2026 |
| Thomson-Leng Provident Fund Nominees Limited | Financial services | 1998 |
| Thomson-Leng Superannuation Fund Nominees Limited | Administrative & support | 1998 |
| Thomson/Miller Properties Ltd | Real estate | 2025 |
| Thomsons Solutions Limited | Manufacturing | 2020 |
| Thon Maritime Ltd | Transport & logistics | 2020 |
| Thorntons Discretionary Holdings Limited | Financial services | 2024 |
| Thorntons Financial Planning Holdings Limited | Financial services | 2026 |
| Thorntons Financial Planning Limited | Financial services | 2025 |
| Thorntons Investment Holdings Limited | Financial services | 2020 |
| Thorntons Law LLP | | 2004 |
| Thorntons Policy Trustees Limited | Professional & scientific | 2012 |
| Thorntons Properties Limited | Professional & scientific | 1988 |
| Thorntons Trustees Ltd. | Professional & scientific | 1994 |
| Thorntons Wealth Management Limited | Financial services | 2003 |
| Three Lens Advisory Ltd | Professional & scientific | 2026 |
| Three SIX Nine Ltd | Administrative & support | 2017 |
| Three Solutions Limited | Professional & scientific | 2008 |
| Threesbee Limited | Administrative & support | 2025 |
| Thriepley Limited | Manufacturing | 2023 |
| Thriving Life Ltd | Wholesale & retail | 2025 |
| Throughline Clothing Ltd | Wholesale & retail | 2026 |
| Thrums Letting Limited | Real estate | 2017 |
| Thundersilver L.P. | | 2015 |
| Thyme OUT Limited | Hospitality | 2016 |
| TIA Barty Ltd | Transport & logistics | 2025 |
| Tialt - There IS an Alternative Ltd | Professional & scientific | 2022 |
| Tibea Limited | Other services | 2021 |
| Tideline Investments Ltd | Agriculture & fishing | 2021 |
| Tidy JOB Ltd | Administrative & support | 2021 |
| Tiel Consulting Ltd | Professional & scientific | 2022 |
| Tiga Properties Limited | Real estate | 1989 |
| Tiger Feet (Scotland) Ltd | Wholesale & retail | 2014 |
| Tigh-Na-Muirn Limited | Households | 2010 |
| Tilnic Ltd | Other services | 2025 |
| Tilotia Ltd | Transport & logistics | 2025 |
| Timber Engineering UK Ltd | Manufacturing | 2020 |
| Timber Tree Surgery Ltd | Agriculture & fishing | 2022 |
| Timberframe Automation Consultancy Ltd | Wholesale & retail | 2019 |
| Timelapse Pro Ltd | Professional & scientific | 2019 |
| Timex Impex L.P. | | 2015 |
| Timmergreens Store Ltd | Wholesale & retail | 2022 |
| Timms Taxis Ltd | Transport & logistics | 2009 |
| Timoil Accents LP | | 2017 |
| Timorous Beastie Productions Ltd | Arts & recreation | 2022 |
| TIN Roof | Arts & recreation | 2011 |
| Tina Welsh Advisory Limited | Professional & scientific | 2026 |
| Tinsmiths Inns Ltd | Hospitality | 2021 |
| Tiny Creations Limited | Arts & recreation | 2016 |
| Tiree Investments Limited | Real estate | 2000 |
| Tirobio Ltd | Professional & scientific | 2023 |
| Tissue Solutions Limited | Health & social care | 2007 |
| Tissywu Limited | Arts & recreation | 2009 |
| Titanic Pizza Co Limited | Hospitality | 2015 |
| TJG Business Services Ltd | Professional & scientific | 2014 |
| TJG Ltd | Hospitality | 2021 |
| Tjgir Ltd | Health & social care | 2023 |
| TJL Services Ltd | Health & social care | 2015 |
| TKY Consults Limited | Professional & scientific | 2025 |
| TL Inns Limited | Extraterritorial | 2014 |
| TL Restaurants (C) Ltd | Hospitality | 2018 |
| TL Restaurants Limited | Extraterritorial | 2014 |
| TLA Homes Ltd | Real estate | 2025 |
| TLA Housing Services Ltd | Construction | 2020 |
| TLA Neighbourhood Services Limited | Health & social care | 2017 |
| TLA Trading Limited | Hospitality | 2025 |
| TLC Pet Care & Dog Walking Services Ltd | Other services | 2022 |
| TLR (Scotland) Limited | Construction | 2013 |
| TLT Investments Limited | Professional & scientific | 2014 |
| TM P Distributions Ltd | Wholesale & retail | 2026 |
| Tm&R Ltd | Information & communication | 2015 |
| TMA Accountants and Taxation Advisers Limited | Professional & scientific | 2009 |
| TMG Advisory Services Ltd | Professional & scientific | 2023 |
| Tmrpharm Ltd | Health & social care | 2023 |
| TNC Family Investment Co Ltd | Other services | 2024 |
| TO the Moon and Back Travel Ltd | Administrative & support | 2026 |
| Tobby Ventures LP | | 2017 |
| Tobg Limited | Extraterritorial | 2018 |
| Tocco LP | | 2012 |
| Todd Joinery Ltd | Construction | 2018 |
| Toeandheel Entries Limited | Information & communication | 2020 |
| Toeandheel.Com Ltd | Information & communication | 2003 |
| Toeandheelgold Ltd | Wholesale & retail | 2003 |
| TOG3 Ltd | Real estate | 2025 |
| Together Tayside C.I.C. | Health & social care | 2026 |
| TOM Daly Limited | Information & communication | 2007 |
| TOM Pigeon Ltd | Arts & recreation | 2015 |
| Tone of Voice Nerd Ltd | Professional & scientific | 2022 |
| Tooling & Equipment Services Ltd. | Wholesale & retail | 2009 |
| Top BUN Ltd | Hospitality | 2026 |
| Top Chef Delivery Limited | Hospitality | 2022 |
| Top Chef Ltd | Hospitality | 2022 |
| Top Dog Sports Limited | Hospitality | 2024 |
| Top Nail and Spa Limited | Other services | 2024 |
| Top Rope UK Ltd. | Professional & scientific | 2008 |
| Toplist Trade LP | | 2019 |