| TSI Structures EOT Ltd | Administrative & support | 2023 |
| TSK Engineering Ltd | Professional & scientific | 2025 |
| Tskr Fitness Ltd | Arts & recreation | 2024 |
| Tsl-Engraving Ltd | Wholesale & retail | 2023 |
| Tslm Limited | Wholesale & retail | 2024 |
| TSM Marine Consultants Ltd | Other services | 2022 |
| TSO Software Ltd | Information & communication | 2011 |
| TSP Global Limited | Extraterritorial | 2013 |
| TT Construction (East Anglia) Ltd | Construction | 2014 |
| TT Investments (Norfolk) Ltd | Real estate | 2021 |
| TT Jones Electrical Limited | Construction | 2003 |
| Ttg-Xtra Ltd | Professional & scientific | 2007 |
| TTP Devices Ltd | Manufacturing | 2009 |
| TTT Builder Ltd | Construction | 2019 |
| Tubbs SON Giles & Co Limited | Professional & scientific | 2006 |
| Tubcat Property Ltd | Real estate | 2017 |
| Tuck's Wood Joinery Limited | Manufacturing | 2015 |
| Tuck's Wood Roof Lanterns Limited | Extraterritorial | 2021 |
| Tucker Equity Limited | Extraterritorial | 2019 |
| Tucker Estates Limited | Real estate | 2022 |
| TUD Developments Limited | Real estate | 1990 |
| Tuddies Convenience Stores Limited | Wholesale & retail | 2005 |
| Tudor Clinical Limited | Health & social care | 2017 |
| Tudor Homecare Services Ltd | Health & social care | 2026 |
| Tufts Developments Ltd | Construction | 2018 |
| Tufts of Bradenham Ltd | Administrative & support | 2018 |
| Tula Food Limited | Hospitality | 2019 |
| Tulastra Ltd | Professional & scientific | 2024 |
| Tully Wakeman Ltd | Information & communication | 2024 |
| Tullybeg Ltd | Real estate | 2025 |
| Tullyillion Ltd | Extraterritorial | 2015 |
| Tulum Beach Ltd | Information & communication | 2011 |
| Tumbles Well House Limited | Real estate | 2019 |
| Tungsten Publishing Ltd | Information & communication | 2017 |
| Tunmore Automatics Limited | Real estate | 1966 |
| Tunmore Farm Services Limited | Administrative & support | 2010 |
| Tunmore Leisure Limited | Administrative & support | 1991 |
| Tunnel Ltd | Wholesale & retail | 2023 |
| Tunstall Takeaways Limited | Hospitality | 2019 |
| Tunstead IFC Limited | Extraterritorial | 2006 |
| Tunstead Road Development Land Ltd | Construction | 2022 |
| Turbow Holdings Limited | Financial services | 2020 |
| Turbulent Brewing Company Ltd | Hospitality | 2019 |
| Turf Solutions Ltd | Administrative & support | 2006 |
| Turks and Caicos Vacations Limited | Other services | 2020 |
| Turkuaz Restaurant (Norwich) Limited | Hospitality | 2026 |
| Turn 01 Ltd | Professional & scientific | 2022 |
| Turn IT Tropical Limited | Wholesale & retail | 2019 |
| Turn the Tides EA Ltd | Administrative & support | 2020 |
| Turnaround Hydrographic Services Limited | Professional & scientific | 2011 |
| Turnbull and De'Ath Limited | Hospitality | 2004 |
| Turner & Buxton Ltd | Real estate | 2023 |
| Turner Building & Electrical Ltd. | Construction | 2007 |
| Turner Capital Limited | Financial services | 2021 |
| Turner Entertainment Ltd | Arts & recreation | 2023 |
| Turner European Consulting Limited | Administrative & support | 2005 |
| Turner Maintenance Limited | Construction | 2010 |
| Turner Media Ltd | Professional & scientific | 2021 |
| Turner Property Investments and Home Lettings Ltd | Real estate | 2018 |
| Turner Tyres Ltd | Wholesale & retail | 2021 |
| Turners for MEN Limited | Wholesale & retail | 1994 |
| Turners Garage (Norwich) Limited | Wholesale & retail | 2011 |
| Turners Occupational Health & Wellbeing Services Limited | Health & social care | 2017 |
| Turnham-Crewe Services Ltd | Construction | 2014 |
| Turning Factor Limited | Administrative & support | 2009 |
| Turning Pictures Ltd | Information & communication | 2023 |
| Turnkey HR Ltd | Administrative & support | 2022 |
| Turntable Telecom Services Limited | Information & communication | 2007 |
| Tuskan Thai Limited | Hospitality | 2016 |
| Tuskan Thai Property Limited | Real estate | 2021 |
| Tusker Properties Ltd | Real estate | 2024 |
| TV Sound Limited | Other services | 2011 |
| TW (Southwold) Freehold Limited | Households | 2013 |
| TW Partnership LLP | | 2007 |
| TW Tennis Coaching Limited | Arts & recreation | 2021 |
| Twana Hand Car Wash Ltd | Other services | 2020 |
| Tweed House (Norfolk) Management Limited | Households | 2006 |
| Tween Farming Limited | Agriculture & fishing | 1974 |
| Twelve Modular Systems Ltd | Manufacturing | 2020 |
| TWELVE12 Limited | Wholesale & retail | 2023 |
| Twenty Red Lions Limited | Administrative & support | 2021 |
| Twenty Seven Unthank Road Limited | Real estate | 2007 |
| TWENTY55 Design Ltd | Construction | 2016 |
| TWF Roller Garage Door Installations Ltd | Construction | 2020 |
| TWH Services (Norfolk) Limited | Construction | 2025 |
| Twickenham Restaurants Ltd | Hospitality | 2024 |
| Twin Peaks Distillery Limited | Manufacturing | 2024 |
| Twin Rivers Holiday Park Ltd | Hospitality | 2007 |
| Twinfold Consultancy Limited | Professional & scientific | 2026 |
| Twinkle Time Cleaning Limited | Administrative & support | 2026 |
| Twinkle's SEN Activity Days CIC | Health & social care | 2020 |
| Twins Touch Ltd | Administrative & support | 2023 |
| Twinsbakes Limited | Manufacturing | 2022 |
| Twist Development Limited | Information & communication | 2013 |
| Twisted Pendant Ltd | Wholesale & retail | 2021 |
| Twlmc Ltd | Health & social care | 2017 |
| TWM Construction Ltd | Real estate | 2013 |
| TWM Norfolk Limited | Hospitality | 2022 |
| TWM Residential Ltd | Administrative & support | 2020 |
| Two Jays Farm Ltd | Hospitality | 2021 |