| THE Holwood Trust Limited | Agriculture & fishing | 2004 |
| THE Hughes Brand Group Ltd | Financial services | 2026 |
| THE Kindness Cooperation CIC | Health & social care | 2024 |
| THE Kingswood Law Partnership Limited | Financial services | 2000 |
| THE Kitchen Agency Ltd | Professional & scientific | 2025 |
| THE Lodge Coffee Shops Ltd | Hospitality | 2015 |
| THE Lodge Tea and Coffee Company Limited | Wholesale & retail | 2026 |
| THE Market Square Food & Wine Company Limited | Wholesale & retail | 2010 |
| THE Matt Ratana Rugby Foundation | Education | 2020 |
| THE Medi-Derm Company Limited | Manufacturing | 1997 |
| THE Modern Property Company (UK) Ltd | Real estate | 2019 |
| THE Mount (East Grinstead) 1991 Limited | Households | 1991 |
| THE MUG Tree Limited | Wholesale & retail | 2013 |
| THE Nest (E G) Ltd Ltd | Hospitality | 2026 |
| THE Nest (Sussex) Ltd | Hospitality | 2021 |
| THE Oaks (East Grinstead) Management Limited | Hospitality | 2004 |
| THE Olympian Group Limited | Professional & scientific | 1990 |
| THE Place Brand Academy Ltd | Education | 2023 |
| THE Real Food Cafe Limited | Hospitality | 2004 |
| THE Self Build House Company Limited | Construction | 1998 |
| THE Session MAN Limited | Information & communication | 2019 |
| THE Sign Company (E.G) Ltd | Manufacturing | 2017 |
| THE Sportsman Public House Limited | Hospitality | 2020 |
| THE Stagg PUB Co Limited | Hospitality | 2022 |
| THE Star Lingfield Ltd | Hospitality | 2013 |
| THE Sustainable Food Company Ltd | Manufacturing | 2026 |
| THE Village Garage EG Ltd | Wholesale & retail | 2020 |
| THE Weight Loss Centre Ltd | Health & social care | 2011 |
| THE49 Ltd | Information & communication | 2022 |
| Then Tham Ltd | Hospitality | 2023 |
| Theopenarms Ltd | Hospitality | 2021 |
| Theta Properties Limited | Construction | 2003 |
| Thinkspace Technologies Ltd. | Manufacturing | 2015 |
| Thompson Tree Care Ltd | Administrative & support | 2020 |
| Three Old Birds Ltd | Wholesale & retail | 2024 |
| Threeec-R Ltd | Wholesale & retail | 2025 |
| Thrive Accountants LLP | | 2013 |
| Thrive Renew Retreats Ltd | Arts & recreation | 2026 |
| Thriveworks Limited | Professional & scientific | 2016 |
| Throva Limited | Professional & scientific | 2026 |
| Thunders Enterprises Limited | Information & communication | 2013 |
| Thyssenkrupp Krause | Manufacturing | 1981 |
| Tick App Ltd | Information & communication | 2026 |
| Tickled Moon Ltd | Extraterritorial | 2024 |
| Tigerbee Media Limited | Professional & scientific | 2017 |
| Timley Limited | Hospitality | 2025 |
| Timofey Ltd | Information & communication | 2023 |
| Tiny Tigers Day Nurseries Limited | Education | 2020 |
| Tiny Tigers Day Nursery Ltd. | Education | 2003 |
| Tithe Orchard Management Company Limited | Households | 1997 |
| TJ Chatterton Consulting Ltd | Professional & scientific | 2018 |
| TJ Lock Ltd | Professional & scientific | 2023 |
| TK Build & Designs Limited | Construction | 2025 |
| TLC Construction Group Ltd | Construction | 2023 |
| TLG Holdings (UK) Ltd. | Professional & scientific | 2004 |
| TMC Advisory Services Ltd | Professional & scientific | 2012 |
| TNK Engineering Ltd | Wholesale & retail | 2007 |
| Tobias Trust Limited | Education | 2003 |
| Todd Hairdressing Ltd | Other services | 2023 |
| TOM AZ Atom Ltd | Transport & logistics | 2024 |
| TOM Wheelhouse Consulting Ltd | Professional & scientific | 2023 |
| Tom-Wood Ltd | Manufacturing | 2025 |
| Tomarlex Ltd | Professional & scientific | 2020 |
| Tomary Projects Ltd | Professional & scientific | 2025 |
| Tonham Property LLP | | 2015 |
| Top Marks Tuition Ltd | Education | 2008 |
| Topbuyseu Ltd | Wholesale & retail | 2023 |
| Topstitch Upholstery Limited | Other services | 2019 |
| Torosaur Limited | Arts & recreation | 2015 |
| Total Health Osteopathy Limited | Health & social care | 2014 |
| Toucan Electrical Services Ltd | Construction | 2013 |
| Touring Club of Great Britain and Ireland Limited | Other services | 1966 |
| Townsend Consulting (South East) Limited | Extraterritorial | 2014 |
| TR Finds Properties Ltd | Real estate | 2025 |
| Trade Glazing Ltd | Construction | 2025 |
| Trademate AI Ltd | Information & communication | 2025 |
| Traianvs Investment Ltd | Financial services | 2016 |
| Training Compliance Ltd | Financial services | 2021 |
| Transbright Ltd | Professional & scientific | 2021 |
| Trattoria Santino Limited | Hospitality | 2024 |
| Travel Fiveo Limited | Administrative & support | 2018 |
| Treasure of Silver Lake Ltd | Construction | 2025 |
| Treasure Trove East Grinstead Ltd | Wholesale & retail | 2019 |
| Tredgett's Tree Work Limited | Administrative & support | 2002 |
| Treegarden Software Ltd | Information & communication | 2026 |
| Trend Cosmetics & Laboratory Ltd | Wholesale & retail | 2023 |
| Trevelyan Building Services Limited | Construction | 2019 |
| Trohn Ltd | Wholesale & retail | 2024 |
| True Build (Warlingham) Limited | Construction | 2016 |
| Trueman Concepts Limited | Professional & scientific | 2024 |
| Truly Happy Products Ltd | Wholesale & retail | 2019 |
| Truly Happy Supplies Ltd | Manufacturing | 2019 |
| Trust ME BOY Limited | Financial services | 2015 |
| Trusted Tutors | Education | 2020 |
| Trusted Tutors School Services Ltd | Education | 2024 |
| Trustee Management Services Ltd | Professional & scientific | 2015 |
| Truu Water UK Ltd | Wholesale & retail | 2019 |
| TSC Graphics Ltd | Manufacturing | 2015 |
| Tubbys Tyres Garage Ltd | Wholesale & retail | 2016 |
| Tubeservices Limited | Information & communication | 2019 |