| Sure Safety Consultancy Limited | Professional & scientific | 2015 |
| Suri's Enterprises Limited Liability Partnership | | 2011 |
| Sussex Business Support Ltd | Administrative & support | 2021 |
| SW Burger Land Ltd | Hospitality | 2026 |
| SW Collective Investments Ltd | Financial services | 2026 |
| SW Collective Ltd | Administrative & support | 2025 |
| SW Drainage & JET Solutions Ltd | Administrative & support | 2025 |
| Sweenie Enterprises Limited | Administrative & support | 2016 |
| Swift Taxi Services Limited | Transport & logistics | 2025 |
| Swpd Ltd | Real estate | 2023 |
| Syla Community Project CIC | Education | 2024 |
| T J Fencing Ltd | Construction | 2014 |
| T J P Electrical Limited | Construction | 2011 |
| T Pesci Equestrian Services Ltd | Agriculture & fishing | 2025 |
| T4 Technical Services Ltd | Professional & scientific | 2017 |
| Tactical Medical Rescue Ltd | Health & social care | 2020 |
| Taeo Robinson Ltd | Professional & scientific | 2018 |
| Taggie Limited | Wholesale & retail | 2019 |
| Tailift & Shutter Door Specialists Limited | Manufacturing | 2007 |
| Talley (Asia) Limited | Professional & scientific | 1948 |
| Talley Group Limited | Manufacturing | 1953 |
| Tamplin Contracting Limited | Construction | 2018 |
| Tamplin Estates Ltd | Real estate | 2018 |
| Tavener Electrical Ltd | Construction | 2025 |
| Tavener Properties Ltd | Real estate | 2026 |
| Tawny View 2 Limited | Professional & scientific | 2025 |
| Taybill Properties Limited | Real estate | 2021 |
| Tazz Studio Limited | Information & communication | 2025 |
| TC Digital Group Ltd | Wholesale & retail | 2026 |
| TCI Futures Limited | Financial services | 2021 |
| TD Electrical Limited | Construction | 2018 |
| Teacrate Limited | Financial services | 2002 |
| Teacrate Rentals Limited | Administrative & support | 1898 |
| Team Coaching Network Limited | Professional & scientific | 2003 |
| Team Metalogic Limited | Information & communication | 2005 |
| Team Rees Ltd | Arts & recreation | 2017 |
| Teaming Consultancy Limited | Administrative & support | 2026 |
| TECHNI3 Limited | Manufacturing | 2008 |
| Techonique Innovation Company Ltd | Information & communication | 2025 |
| Teepro Auto Ltd | Wholesale & retail | 2026 |
| Tekeez Limited | Information & communication | 2016 |
| Tenberry Limited | Extraterritorial | 1999 |
| Terra Bella Gems Ltd | Manufacturing | 2017 |
| Terratherm Limited | Construction | 2021 |
| Tewson Developments Limited | Real estate | 2024 |
| TH Philip Sarah Limited | Administrative & support | 2017 |
| Thando Limited | Health & social care | 2018 |
| THE Aber Sports & Social Club Ltd | Hospitality | 2015 |
| THE Athlete Program Ltd | Arts & recreation | 2016 |
| THE Band Merch Club Ltd | Wholesale & retail | 2024 |
| THE Caerphilly Woodlands Trust Limited | Other services | 2004 |
| THE Cleaning Fairy (Caerphilly) Limited | Administrative & support | 2024 |
| THE Coffee Shop (Llantwit Fardre) Limited | Hospitality | 2023 |
| THE Construction Training Consultancy Ltd | Administrative & support | 2018 |
| THE Curious Dog Limited | Other services | 2020 |
| THE Detail Haus Supplies Ltd | Wholesale & retail | 2026 |
| THE Empowered Healing Company Ltd | Health & social care | 2025 |
| THE Etch Shed Limited | Wholesale & retail | 2025 |
| THE Garage Bedwas Ltd | Wholesale & retail | 2024 |
| THE Gentleman Bear Brewing Company Ltd | Manufacturing | 2017 |
| THE Glass Fibre Roofing Company Limited | Wholesale & retail | 1998 |
| THE Grand LUX Hotels Ltd | Hospitality | 2024 |
| THE Helix Training Centre Ltd | Education | 2023 |
| THE Hidden Crystal Sports Bar and Grill Ltd | Hospitality | 2025 |
| THE Kirton Healthcare Group Limited | Extraterritorial | 1980 |
| THE Lady Paint & Decor Ltd | Construction | 2024 |
| THE Masons Brand Ltd | Hospitality | 2024 |
| THE Mobile Coffee Van Ltd | Hospitality | 2026 |
| THE Mortgage Team Ltd | Financial services | 2020 |
| THE Motor City Trade Centre Limited | Wholesale & retail | 2021 |
| THE Nudge Safety Group Ltd | Professional & scientific | 2024 |
| THE Old Library Caerphilly Ltd | Hospitality | 2015 |
| THE Old Sail Loft (Crowlas) Management Limited | Households | 2006 |
| THE Outcome Practice Ltd | Professional & scientific | 2026 |
| THE Renovo Clinic Ltd | Other services | 2026 |
| THE Sky Life Project Limited | Administrative & support | 2019 |
| THE Softer Butter Co. Limited | Professional & scientific | 2015 |
| THE Sylvan Corporation Limited | Wholesale & retail | 1992 |
| THE Vape House Limited | Wholesale & retail | 2015 |
| THE Way of the Warriors | Health & social care | 2020 |
| THE Wood & Wire Fence Company Limited | Manufacturing | 2009 |
| Themockjitoclub Limited | Public administration | 2026 |
| Theopshouse Ltd | Administrative & support | 2025 |
| Therapaws Wellbeing Services C.I.C. | Education | 2026 |
| Thermal Energy Group Ltd | Financial services | 2021 |
| Think Fractional Ltd | Administrative & support | 2025 |
| Thinkedi Ltd | Administrative & support | 2023 |
| Thomas Carroll Brokers Swansea Limited | Financial services | 2017 |
| Thomas Carroll Limited | Financial services | 2021 |
| Thomas Central Limited | Hospitality | 2013 |
| Thomas, Carroll (Brokers) Limited | Financial services | 2000 |
| Thomas, Carroll Group PLC | Professional & scientific | 1966 |
| Thomas, Carroll Management Services Limited | Professional & scientific | 2006 |
| Thomas, Carroll Private Clients Limited | Financial services | 2000 |
| Thomas, Carroll Properties Limited | Real estate | 1997 |
| Thomas, Carroll Trustees Limited | Professional & scientific | 2023 |
| THR Simracing Limited | Arts & recreation | 2025 |
| Timber Tech Holdings Limited | Financial services | 2015 |
| Timeless Capture Limited | Professional & scientific | 2025 |
| Title Verso Ltd | Information & communication | 2020 |