| Tilton & Thomas Care Ltd | Education | 2021 |
| TIM Kenny Surveying Ltd | Professional & scientific | 2016 |
| TIM Wonnacott and Associates Limited | Professional & scientific | 2003 |
| TIM Wonnacott Media Services Limited | Administrative & support | 2003 |
| Timberley Groundworks Group Limited | Construction | 2014 |
| Timberley Projects Limited | Construction | 2014 |
| Time to Shine Agency Limited | Arts & recreation | 2015 |
| Timlick Scaffolding Ltd | Construction | 2023 |
| Timpasu Ltd | Real estate | 2016 |
| Timports Limited | Agriculture & fishing | 2008 |
| Tint-Art Ltd | Wholesale & retail | 2013 |
| Tintcraft Ltd | Construction | 2024 |
| Tinwood Estate Limited | Agriculture & fishing | 2009 |
| Tinwood Group Limited | Agriculture & fishing | 2015 |
| Tipton Project Management Ltd | Professional & scientific | 2015 |
| Tiptop Permanent Makeup Ltd | Other services | 2022 |
| Tiptop SKI Coaching Ltd | Arts & recreation | 2014 |
| Titania Properties Limited | Real estate | 2021 |
| TJ Interiors Ltd | Construction | 2020 |
| TJ Maintenance & Refurbishment Limited | Construction | 2020 |
| TJL Electrical Ltd | Construction | 2020 |
| Tjss Ltd | Wholesale & retail | 2004 |
| TL Sailing Ltd | Transport & logistics | 2022 |
| TLC Beauty Studio Ltd | Other services | 2024 |
| TM Hutch Holdings Ltd | Real estate | 2026 |
| TMB Properties (2018) Ltd | Real estate | 2018 |
| Tmcc Holdings Ltd | Real estate | 2025 |
| Tmdm Trading Limited | Professional & scientific | 2023 |
| TMG Composites LTS Ltd | Manufacturing | 2025 |
| TMS Tyres (Sussex) Limited | Wholesale & retail | 2015 |
| TMT Catering (Sussex) Ltd | Hospitality | 2024 |
| TNT Engineering Solutions Limited | Manufacturing | 2021 |
| TO YOU Hire Ltd | Administrative & support | 2016 |
| Toby Fieldhouse Ltd | Professional & scientific | 2022 |
| Toby Salt Consulting Limited | Professional & scientific | 2019 |
| Toby Wilsher Training Ltd | Education | 2012 |
| TOD Anstee LLP | | 2009 |
| TOD Anstee Property Consultants Limited | Real estate | 2016 |
| Tolworth Construction Surrey Limited | Construction | 2025 |
| TOM Creswick Podiatry Limited | Health & social care | 2025 |
| TOM Lishman Sound Design Ltd | Arts & recreation | 2003 |
| TOM W Chapman Ltd | Other services | 2019 |
| Tom's Framing Limited | Wholesale & retail | 2017 |
| Tomasa Foods Ltd | Manufacturing | 2025 |
| Tombolo Africa Limited | Financial services | 2024 |
| Tomicasa Ltd | Real estate | 2023 |
| Tomm Jewellery Limited | Manufacturing | 2019 |
| Tony Clarke Music Limited | Arts & recreation | 2008 |
| Tony Partridge Autos Ltd | Wholesale & retail | 2015 |
| Tony's Plumbing & Heating Services Limited | Construction | 2006 |
| TOO Many Kitchens Limited | Hospitality | 2023 |
| Top Marks Business Services Limited | Professional & scientific | 2025 |
| Top Field Consulting Limited | Information & communication | 2024 |
| Topheat Ltd | Construction | 2019 |
| TOR Equine Limited | Professional & scientific | 2016 |
| Torus Industrial Finance Limited | Financial services | 2017 |
| Total Build & Construction Limited | Construction | 2018 |
| Total Computer Support (Systems) Limited | Other services | 1986 |
| Total Computer Support Limited | Information & communication | 1984 |
| Total Custom Conversions Limited | Wholesale & retail | 2017 |
| Total Foot Protection Limited | Agriculture & fishing | 1999 |
| Total Tool Hire Limited | Professional & scientific | 2004 |
| Totally Blocked Ltd | Water & waste | 2015 |
| Towergold Limited | Wholesale & retail | 1986 |
| Townguilds Limited | Real estate | 1979 |
| Townsmart Property Management Limited | Households | 1992 |
| Toys for Big Boys Limited | Wholesale & retail | 2019 |
| TPA (Sussex) Ltd | Wholesale & retail | 2026 |
| TPJ Developments Limited | Real estate | 2018 |
| TRACE37 Limited | Information & communication | 2025 |
| Tracked Spider Sales (TSS) Ltd | Wholesale & retail | 2019 |
| Trade Guys Ltd | Construction | 2018 |
| Tradecliff Limited | Transport & logistics | 1978 |
| Tradermate Ltd | Professional & scientific | 2021 |
| Tradesconnect Global Limited | Other services | 2024 |
| Trading Floor Solutions Limited | Administrative & support | 2019 |
| Trading Post TCG Ltd | Wholesale & retail | 2025 |
| Traditional Twist and Sweep Limited | Construction | 2016 |
| Trafalgar Court (Worthing) Limited | Households | 2005 |
| Training Excellence Ltd | Education | 2007 |
| Trans EL Limited | Transport & logistics | 2019 |
| Transflora LLP | | 2009 |
| Transformative Pharmaceutical Solutions UK Limited | Administrative & support | 2023 |
| Transmation Limited | Construction | 1988 |
| Trap DEV Limited | Construction | 2016 |
| Trap NOR Limited | Professional & scientific | 2016 |
| Travel Reference Limited | Information & communication | 2008 |
| Travillas Limited | Administrative & support | 1995 |
| Tree Cutting LP | | 2000 |
| Trees Court Management Company Limited | Households | 1982 |
| Trendmap Limited | Manufacturing | 2024 |
| Tres Joli Gite Limited | Hospitality | 2023 |
| Trfj Holdings Ltd | Real estate | 2024 |
| Triangle Consignment Ltd | Wholesale & retail | 2024 |
| Trienergy Solutions Ltd | Wholesale & retail | 2013 |
| Trimspeed Ltd | Manufacturing | 2014 |
| Trinity Insurance Services Limited | Financial services | 2000 |
| Trio Estates Limited | Real estate | 1998 |
| Trip Electrical Contractors Ltd | Construction | 2006 |
| Tripplesfoods Ltd | Hospitality | 2023 |