| THE Scribbling Shop Limited | Wholesale & retail | 2005 |
| THE Seasons Art Class Canada Limited | Professional & scientific | 2023 |
| THE Seasons Art Class International Limited | Professional & scientific | 2014 |
| THE Seasons Art Class UK Limited | Professional & scientific | 2014 |
| THE Secret Linen Store Ltd | Wholesale & retail | 2013 |
| THE Shrubbery (Bognor Regis) Management Limited | Households | 2000 |
| THE Sign Shop Horsham Limited | Professional & scientific | 1999 |
| THE Sign Shop Portsmouth Limited | Real estate | 1999 |
| THE Speakers Platform Ltd | Administrative & support | 2022 |
| THE Spires (Yapton) Management Company Limited | Households | 2020 |
| THE Sussex Heating Care Company Ltd | Construction | 2018 |
| THE Tech FAM Limited | Wholesale & retail | 2025 |
| THE Thatching GUY Ltd | Construction | 2024 |
| THE Tool Armoury Ltd | Wholesale & retail | 2025 |
| THE Vatcompany Limited | Professional & scientific | 2018 |
| THE Wellness Tribe Hub CIC | Health & social care | 2026 |
| THE Woodlands (Sayers Common) Management Company Limited | Households | 2025 |
| Theatre (Bognor) Limited | | 1947 |
| Thesteelbookshop Ltd | Wholesale & retail | 2019 |
| Thesweethouse.Co Limited | Hospitality | 2026 |
| Think Design & Build Limited | Construction | 2022 |
| Thinkly Group Limited | Information & communication | 2020 |
| Thirst Link (CGB) Limited | Administrative & support | 2016 |
| Thompson Civils Engineering Ltd | Construction | 2018 |
| Thompson Electrical Surrey Limited | Construction | 2014 |
| Three Point Properties Limited | Real estate | 2022 |
| Threeeightnine Limited | Wholesale & retail | 2019 |
| Thrive UK and Europe Limited | Health & social care | 2019 |
| Ticon UK Limited | Information & communication | 2003 |
| Tidy Property Maintenance Limited | Administrative & support | 2017 |
| Tidy&Co Enterprises Ltd | Construction | 2021 |
| Tielen Ltd | Professional & scientific | 2023 |
| Tigerlily Tattoos Ltd | Professional & scientific | 2018 |
| Tilleys Accountancy Limited | Professional & scientific | 2012 |
| Timbertype Limited | Administrative & support | 2001 |
| Time and Away Ltd | Hospitality | 2023 |
| Timperley & Owens Ltd | Wholesale & retail | 2017 |
| Timperley & Owens Properties Ltd | Real estate | 2024 |
| Tingis Holiday Cottage Limited | Real estate | 2017 |
| Tirulescu Ltd | Health & social care | 2016 |
| Titaruela Ltd | Wholesale & retail | 2016 |
| TJ Detailing Ltd | Administrative & support | 2025 |
| TJ Open Ltd | Construction | 2026 |
| TJE Solutions Limited | Construction | 2016 |
| TMO Property Group Ltd | Construction | 2026 |
| TMO Property Solutions Ltd | Construction | 2026 |
| Toby Mullins Consulting Ltd | Professional & scientific | 2025 |
| Toddington Nurseries Limited | Agriculture & fishing | 2011 |
| Token House (Management) Limited | Real estate | 1988 |
| TOM Ball Copywriting Limited | Administrative & support | 2023 |
| Tombik Fast Food Limited | Wholesale & retail | 2020 |
| Tomlet Sussex Ltd | Real estate | 2022 |
| Tommy Block Decorating Limited | Construction | 2023 |
| Tonsley Heights Management Co. Limited | Households | 1987 |
| Top Barber Bognor Ltd | Other services | 2021 |
| Top Forker Services Limited | Other services | 2017 |
| Top Guard Roofing and Paving Limited | Construction | 2026 |
| Top Notch Renovation & Installation Ltd | Construction | 2024 |
| Topalli AI Consultancy Limited | Information & communication | 2018 |
| Topmop Cleaners Ltd | Administrative & support | 2018 |
| Topmop Cleaning Ltd | Other services | 2018 |
| Topserve Limited | Education | 2002 |
| Total Heatcare Limited | Construction | 2003 |
| Total Recore Ltd | Professional & scientific | 2026 |
| Touch the Sky Limited | Health & social care | 2004 |
| Tour Pride Ltd | Manufacturing | 2026 |
| Town and Country Rigging Limited | Information & communication | 2025 |
| Toyz-N-Teds Ltd | Wholesale & retail | 2024 |
| TPS Realisations 2024 | Education | 2014 |
| Trace Recruitment Ltd | Administrative & support | 2022 |
| Track and Boom Ltd | Professional & scientific | 2022 |
| Traditional Secretary Limited | Administrative & support | 2016 |
| Trainermind Ltd | Arts & recreation | 2019 |
| Tranquil Distribution Ltd | Wholesale & retail | 2022 |
| TRANS4MATION Business Services Ltd | Administrative & support | 2020 |
| Transitional Compliance Limited | Health & social care | 2017 |
| Travel&Trims Ltd | Other services | 2025 |
| Travelling Together (IG) Ltd | Professional & scientific | 2017 |
| Travers Property Services Ltd | Construction | 2026 |
| Tremula Network Ltd | Information & communication | 2024 |
| Trent House Management Company Limited | Extraterritorial | 1975 |
| Trevellyn Limited | Real estate | 1992 |
| Tribe Carpentry Ltd | Construction | 2011 |
| Trident Menswear Ltd | Wholesale & retail | 2023 |
| Trifestyle Ltd | Information & communication | 2023 |
| Trimenia Ltd | Other services | 2019 |
| Trimmer Consulting Limited | Professional & scientific | 2023 |
| Trimstone Holdings Ltd | Financial services | 2026 |
| Trinity Consultants West Sussex Limited | Professional & scientific | 2017 |
| Tripletonics Ltd | Hospitality | 2023 |
| Tristan Independent Traders Ltd | Wholesale & retail | 2026 |
| Trojan Taverns Ltd | Hospitality | 2024 |
| Trok Limited | Real estate | 2021 |
| Trompeta Limited | Manufacturing | 2019 |
| Trucktrain Industries Limited | Transport & logistics | 2010 |
| True Strength Repair Limited | Arts & recreation | 2020 |
| Tsyds Ltd | Construction | 2026 |
| Tudor Rose Mobile Home Park Limited | Hospitality | 2024 |
| Tugwell and Baker Ltd | Construction | 2025 |
| Tulip Live-In Care Limited | Health & social care | 2019 |