| Sycamore Property Investments Ltd | Real estate | 2019 |
| Syed 2020 Ltd | Hospitality | 2021 |
| Syedmatch Limited | Other services | 2021 |
| Syhiba Restaurant (Wakefield) Limited | Hospitality | 2025 |
| Sykes Property Holdings Ltd | Real estate | 2024 |
| Sykesthompson Limited | Real estate | 2019 |
| SYL Events Ltd | Hospitality | 2025 |
| Syllogic Ltd | Professional & scientific | 2024 |
| Symmetry Recruitment Ltd | Administrative & support | 2023 |
| Synapsis Properties Limited | Real estate | 2010 |
| SYNC2SITE Ltd | Information & communication | 2026 |
| Syncrisis Ltd | Professional & scientific | 2025 |
| Syndicate Design Limited | Professional & scientific | 2008 |
| Synergy Distribution Services Ltd | Wholesale & retail | 2024 |
| Syneveo Limited | Information & communication | 2026 |
| Systematic Governance Limited | Information & communication | 2023 |
| Sytech IT Limited | Information & communication | 2015 |
| SZ Property Limited | Real estate | 2022 |
| SZJ H Limited | Real estate | 2026 |
| T & I Interiors Limited | Construction | 2015 |
| T and L Business Enterpise Ltd | Hospitality | 2016 |
| T G Heating and Plumbing (Wakefield) Ltd | Construction | 2021 |
| T G L Limited | Transport & logistics | 2013 |
| T Gething Groundcare Ltd | Administrative & support | 2022 |
| T Gill Ltd | Hospitality | 2025 |
| T H Chicken Ltd | Hospitality | 2023 |
| T K Properties Liverpool Ltd | Real estate | 2025 |
| T P Garner Limited | Professional & scientific | 2022 |
| T Ruane and SON Construction Ltd | Construction | 2020 |
| T&J Industries Ltd | Hospitality | 2024 |
| T&Kco Ltd | Hospitality | 2026 |
| T&M House Clearance & Cleaning Specialists Limited | Water & waste | 2009 |
| T&R Blue Bell S26 Ltd | Hospitality | 2024 |
| T,B.S Fitters Ltd | Construction | 2018 |
| T. Mullen (Properties) Limited | Administrative & support | 1994 |
| T.A.S. Ltd | Professional & scientific | 2007 |
| T.E Cool Limited | Transport & logistics | 2024 |
| T.S.Booker & SON Limited | Professional & scientific | 1963 |
| T1 Crew Ltd | Information & communication | 2025 |
| T3 Farm Challenge Limited | Other services | 2019 |
| T4 T5 Transformations Limited | Wholesale & retail | 2016 |
| T4T Construction Ltd | Construction | 2025 |
| TA Mash Ltd | Health & social care | 2023 |
| Tabbert AS HLD Ltd | Extraterritorial | 2020 |
| Tabitha Care Group Limited | Health & social care | 2022 |
| Table Top Limited | Wholesale & retail | 2016 |
| Tactical Mobility Solutions Ltd | Manufacturing | 2024 |
| Tagent Ltd | Administrative & support | 2009 |
| TAGTIV8 Limited | Education | 2013 |
| Taho Properties Ltd | Construction | 2020 |
| Tailored Care Services Ltd | Health & social care | 2019 |
| Tailoredcarmats.Com Limited | Wholesale & retail | 2014 |
| TAJ Mahal (Castleford) Ltd | Hospitality | 2018 |
| TAJ Supermarket Kirkgate Limited | Wholesale & retail | 2025 |
| Talent Fields UK Consulting Limited | Professional & scientific | 2023 |
| Talkiru Communications Ltd | Information & communication | 2026 |
| Talyx Search Ltd | Administrative & support | 2026 |
| Tamhalime Ltd | Professional & scientific | 2021 |
| TAN Lines & Sandy Toes Ltd | Administrative & support | 2023 |
| TAN Lines (Castleford) Ltd | Other services | 2026 |
| TAN Lines (Dewsbury) Ltd | Other services | 2024 |
| TAN Lines (Wakefield) Ltd | Other services | 2024 |
| TAN Lines Collection Ltd | Wholesale & retail | 2024 |
| TAN Lines Group Ltd | Hospitality | 2023 |
| Tanfastique (Rothwell) Limited | Other services | 2006 |
| Tanfastique Outwood Limited | Other services | 2017 |
| Tanfastique Rentals Limited | Administrative & support | 2010 |
| Tanfastique Tanning & Beauty Leisure Supplies Limited | Other services | 2017 |
| Tango Business Limited Partnership | | 2008 |
| Tango Services Limited | Transport & logistics | 2025 |
| Tanlines (Barnsley) Ltd | Other services | 2024 |
| Tanlines Hunslet Ltd | Other services | 2026 |
| Tantastic Leisure Limited | Other services | 2015 |
| Tapejoint: Specialists in Taping & Jointing Ltd | Construction | 2023 |
| TAR & Reeds Ltd | Real estate | 2021 |
| TAR Trans Ltd | Wholesale & retail | 2025 |
| Tarar Tastydish Ltd | Hospitality | 2026 |
| Tarnside Cattery Limited | Agriculture & fishing | 2024 |
| Tasca Tankers Limited | Manufacturing | 1994 |
| Taste of China Leeds Ltd | Hospitality | 2022 |
| Taste Talu Ltd | Wholesale & retail | 2023 |
| Tate Quality Management Ltd | Construction | 2023 |
| Tattoo Journey Limited | Other services | 2019 |
| Tattry Design Limited | Transport & logistics | 2014 |
| TAU Europe Limited | Administrative & support | 2018 |
| Tauu Limited | Wholesale & retail | 2025 |
| Tavastechs Ltd | Information & communication | 2023 |
| Tawakul Clinic Ltd | Health & social care | 2025 |
| Tax Remedy Ltd | Professional & scientific | 2018 |
| Tax Saving Accountancy Limited | Professional & scientific | 2021 |
| TAX4ALL Ltd | Professional & scientific | 2026 |
| Taydamit Ltd | Real estate | 2025 |
| Taylor & Taylor Digital Ltd | Information & communication | 2018 |
| Taylor Commerce Ltd | Wholesale & retail | 2022 |
| Taylor Falconbridge Limited | Professional & scientific | 2011 |
| Taylor Homes Ltd | Real estate | 2019 |
| Taylor House Holdings Ltd | Real estate | 2025 |
| Taylor Residential Estates Limited | Real estate | 2021 |
| Taylor Roofing Holdings Ltd | Financial services | 2025 |
| Taylor Staffing Services Limited | Administrative & support | 2012 |