| Trisky Ltd | Wholesale & retail | 2025 |
| Tristans Mortgage Services Limited | Financial services | 2023 |
| Trithermatech Ltd | Administrative & support | 2025 |
| Trium a Limited | Information & communication | 2025 |
| Triwater Ltd | Construction | 2016 |
| TRN Solutions Limited | Construction | 2012 |
| Trojan Barbers Ltd | Hospitality | 2021 |
| Trojan Construction and Environmental Services Ltd | Water & waste | 2013 |
| Trojan Timber Products Ltd | Manufacturing | 2009 |
| Trouvaille Properties Ltd | Real estate | 2022 |
| TRP (Chichester) Ltd | Construction | 2014 |
| Truck and Trailer Specialist's Limited | Wholesale & retail | 1989 |
| True North Trading Ltd | Wholesale & retail | 2026 |
| Truly Gorgeous Bridalwear Limited | Wholesale & retail | 2009 |
| Trump Holdings Ltd | Real estate | 2024 |
| Trusstec Limited | Manufacturing | 1988 |
| Trust Advice Ltd | Professional & scientific | 2018 |
| Trusted Game Scheme Ltd | Professional & scientific | 2021 |
| Tsbc Propagation Limited | Agriculture & fishing | 2012 |
| TSV Enterprise Limited | Wholesale & retail | 2012 |
| TT Fencing and Garden Maintenance Ltd | Administrative & support | 2018 |
| TTA Equine Ltd | Agriculture & fishing | 2023 |
| Tubular Engineering Ltd | Information & communication | 2016 |
| Tuck N'Snug Ltd | Wholesale & retail | 2014 |
| Tudor Clearance Services Limited | Administrative & support | 2023 |
| Tudor Lodge Residents Property Management Limited | Households | 2019 |
| Turf Management Solutions Chichester Limited | Administrative & support | 2006 |
| Turn Quay Ltd | Real estate | 2022 |
| Turnbull & Associates Limited | Professional & scientific | 2025 |
| Turner's Pies Limited | Manufacturing | 2012 |
| Turnwell Kitchens Ltd | Wholesale & retail | 2023 |
| Tusker Services LLP | | 2022 |
| Tutman Fund Solutions Limited | Financial services | 1985 |
| Tutman LLP | | 2011 |
| Tutti Frutti Kitchen Ltd | Wholesale & retail | 2024 |
| TV Healthcare Group Ltd | Health & social care | 2018 |
| TVC Visual Limited | Manufacturing | 1997 |
| TW Display LLP | | 2003 |
| Twelvetrees Properties Limited | Real estate | 2025 |
| Twentynine Investments Ltd | Real estate | 2024 |
| Twin-Cam Consultancy Ltd | Wholesale & retail | 2025 |
| TWL Holdings Ltd | Financial services | 2025 |
| TWN Holdings Limited | Financial services | 2019 |
| Two Harbours Farmers Ltd | Professional & scientific | 2024 |
| Two Paths Consultancy Ltd | Professional & scientific | 2021 |
| TWT Florence Holdings Ltd | Real estate | 2025 |
| TWT Grange RD Holdings Ltd | Real estate | 2026 |
| TWT Valletta Holdings Ltd | Real estate | 2025 |
| Twyford Moors Classic Cars Limited | Wholesale & retail | 2005 |
| Tydel UK Limited | Professional & scientific | 2019 |
| Tylney Jayne Ltd | Wholesale & retail | 2025 |
| Tympany Limited | Manufacturing | 1981 |
| Typical Ltd | Information & communication | 2020 |
| Ubuntu Cycling CIC | Education | 2025 |
| UC Prop 1 Limited | Construction | 2016 |
| Ucontrol Systems Ltd | Information & communication | 2014 |
| UK Base Construction Ltd | Construction | 2026 |
| UK ISP Ltd | Information & communication | 2019 |
| UK Krakow Mini Market Ltd | Wholesale & retail | 2024 |
| UK Structures Ltd | Construction | 2020 |
| UK Year CIC | Education | 2012 |
| Ukindo Creative Limited | Information & communication | 2023 |
| Ukmedequip Ltd | Wholesale & retail | 2017 |
| Ukswa CIC | Education | 2017 |
| Ultimate Fertilizers Limited | Agriculture & fishing | 2011 |
| ULTRA4C Ltd | Arts & recreation | 2024 |
| Ultrasurgical Solutions Ltd | Wholesale & retail | 2024 |
| Ultravino Limited | Wholesale & retail | 2017 |
| UMB H Ltd | Real estate | 2024 |
| UMI3 Limited | Other services | 2024 |
| Unagi Ltd | Information & communication | 2011 |
| Unapologetik AF Ltd | Wholesale & retail | 2024 |
| Unboxed Development Ltd | Professional & scientific | 2025 |
| Unchained PEN Ltd | Information & communication | 2014 |
| Under and Over Flooring and Building Solutions Ltd | Construction | 2025 |
| Unfurled Group Ltd | Wholesale & retail | 2025 |
| UNI Motors Ltd | Wholesale & retail | 2024 |
| Unichoice Brands Ltd | Extraterritorial | 2023 |
| Unique African Food Store Ltd | Wholesale & retail | 2025 |
| Unique Steel Windows Ltd | Manufacturing | 2020 |
| Uniqueleaf Consultancy Limited | Administrative & support | 2015 |
| Unit One Oakwood Ltd | Financial services | 2026 |
| United Fire Extinguishers Limited | Manufacturing | 2010 |
| Unity Worldwide Ltd | Wholesale & retail | 2020 |
| Universal Supplies Limited | Wholesale & retail | 2005 |
| University of Chichester (Multi) Academy Trust | Education | 2013 |
| University of Chichester Students' Union | Education | 2019 |
| Unseeded Ltd | Professional & scientific | 2025 |
| UP and Running Consultancy Limited | Professional & scientific | 2020 |
| UP Marden Farms Limited | Agriculture & fishing | 2023 |
| Upperton Farm Ltd | Real estate | 2026 |
| Uptakemed Limited | Education | 2026 |
| Uptivise Ltd | Professional & scientific | 2024 |
| Urban & Suburban Architecture Studio Ltd | Professional & scientific | 2018 |
| Urban Coast Property Limited | Real estate | 2015 |
| Urban Homes & Property Ltd | Real estate | 2019 |
| Urban Nature Garden Services Limited | Administrative & support | 2014 |
| Urban Nature Tree Surgery Limited | Agriculture & fishing | 2014 |
| Urban Specialists Ltd | Construction | 2020 |
| Urban Tile Design Ltd | Construction | 2025 |