| Steel Facilities Ltd | Professional & scientific | 2018 |
| Steel's Luxury Coaches Limited | Transport & logistics | 2003 |
| Stegghouse Farm Ltd | Financial services | 2020 |
| Stella Energy Group Ltd | Financial services | 2025 |
| Steve Cockerham Limited | Construction | 2003 |
| Steve Mann Caravans Limited | Wholesale & retail | 2012 |
| Stevens Associates Limited | Health & social care | 2019 |
| Stevenson Wealth Management Limited | Financial services | 2010 |
| STO Pro VER Limited | Households | 2022 |
| Stompa Limited | Extraterritorial | 2019 |
| Stott Decorating Contractors Limited | Construction | 2014 |
| Stourton LEA (Management) Limited | Households | 1988 |
| Stoy Holdings Limited | Health & social care | 2024 |
| Stradkonnect Limited | Professional & scientific | 2017 |
| Stratagem Security Ltd | Information & communication | 2025 |
| Stratreal Limited | Professional & scientific | 2023 |
| Strulch Limited | Manufacturing | 2004 |
| Stuart Hyde Associates Limited | Information & communication | 2013 |
| Stuart Lloyd Ltd | Professional & scientific | 2018 |
| Stubham Court Management Company (Ilkley) Limited | Households | 2000 |
| Stubham Lodge Ltd | Real estate | 2016 |
| Studio Bushi Limited | Professional & scientific | 2024 |
| Studiooh Limited | Professional & scientific | 2026 |
| Stunning Property Ltd | Real estate | 2025 |
| Stupa Hills 3A Limited | Real estate | 2022 |
| Subsaharan Properties Ltd | Real estate | 2024 |
| Sugar Bean Ltd | Wholesale & retail | 2025 |
| Sun Brace Ltd | Wholesale & retail | 2021 |
| Sun Street Eats Ltd | Hospitality | 2025 |
| Sunny Pegg Properties Ltd | Real estate | 2025 |
| Sunny Prospect Properties Ltd | Real estate | 2024 |
| Sunnymead Ltd | Agriculture & fishing | 2018 |
| Sunrise Domestic Cleaning Limited | Administrative & support | 2019 |
| Sunshine (Ilkley) Ltd | Hospitality | 2025 |
| Sunshine Health and Well-Being Limited | Health & social care | 2021 |
| Super Ninja Waspinator UK Ltd | Wholesale & retail | 2008 |
| Superior Properties 4 U Ltd | Real estate | 2023 |
| Surekill Pest Control Limited | Administrative & support | 2016 |
| Suspro Limited | Professional & scientific | 2016 |
| Sussex Rope Access Ltd | Construction | 2010 |
| Sustain Solutions Limited | Professional & scientific | 2025 |
| Sustainable Final Mile Ltd | Professional & scientific | 2020 |
| Suzanne Watson Communications Ltd | Administrative & support | 2002 |
| Swafi Ltd | Information & communication | 2025 |
| Swap and Play Wharfedale Ltd | Administrative & support | 2026 |
| Sweeney Investments LLP | | 2011 |
| Sweet Scoops IOW Limited | Wholesale & retail | 2013 |
| SWIM2BIRDS Ltd | Information & communication | 2014 |
| SWITCH2DAY Utilities Ltd | Professional & scientific | 2016 |
| Syke-Ing Properties Ltd | Real estate | 2025 |
| T & R E.C at BL1 Ltd | Hospitality | 2025 |
| T D Faulkner Business Training Limited | Professional & scientific | 1996 |
| T. H. Greenbank Limited | Construction | 1980 |
| T.L.G. Properties Limited | Financial services | 1995 |
| T7N Technology Ltd | Information & communication | 2024 |
| Tabitha Thomas Limited | Real estate | 2015 |
| Tagz Limited | Information & communication | 1994 |
| Tailored Electrical Projects Ltd | Construction | 2026 |
| Tailored Property Investments Ltd | Administrative & support | 2022 |
| Tails on Trails Ilkley Ltd | Other services | 2021 |
| Talisflow Ltd | Information & communication | 2026 |
| Talk Straight Group Limited | Information & communication | 2009 |
| Talk Straight Holdings Limited | Information & communication | 2022 |
| Talk Straight Limited | Information & communication | 2005 |
| Tall Oaks Investments Ltd | Real estate | 2026 |
| Tamaron GAP Limited | Wholesale & retail | 2023 |
| Tanglewood House Limited | Information & communication | 2025 |
| Tanrec Ltd | Energy | 2015 |
| TAO Care Group Ltd | Financial services | 2025 |
| TAO Complex Care Ltd | Administrative & support | 2022 |
| TAO Futures Limited | Health & social care | 2025 |
| TAO Holding Limited | Financial services | 2024 |
| TAO Housing Limited | Real estate | 2024 |
| TAO Staffing Solutions Limited | Administrative & support | 2021 |
| TAO Supported Living Ltd | Real estate | 2025 |
| Taos Publishing Ltd | Information & communication | 2014 |
| Tardis UK Limited | Professional & scientific | 2005 |
| Tarn Site Ltd | Extraterritorial | 2021 |
| Tarn Villas Management Company Limited | Households | 1990 |
| Tatty's Dog Walking Ltd | Other services | 2022 |
| Taylor GAS Services (Leeds) Limited | Construction | 2018 |
| TCI Property Ltd | Real estate | 2025 |
| TDM Estates Ltd | Real estate | 2022 |
| Tea and Crumpets Ltd | Health & social care | 2025 |
| Team 36 UK Ltd | Real estate | 2025 |
| Tech 39 Laboratory Ltd | Health & social care | 2020 |
| Tedbo Limited | Professional & scientific | 2021 |
| TEN2TWO Consulting Limited | Professional & scientific | 2026 |
| Tennant & Darragh Jewellery Workshop Limited | Wholesale & retail | 2018 |
| Tennant&Tennant Ltd | Wholesale & retail | 2014 |
| Textile IQ Limited | Professional & scientific | 2025 |
| Textile Trade Services Limited | Administrative & support | 2009 |
| Thai Street Ltd | Hospitality | 2017 |
| Thames Event Management Limited | Administrative & support | 2009 |
| That's the Badger Productions Ltd | Arts & recreation | 2025 |
| THE Airedale Knee Clinic Ltd | Health & social care | 2019 |
| THE Art Shop (Northallerton) Ltd | Wholesale & retail | 2016 |
| THE Bishop Wheeler Catholic Academy Trust | Education | 2013 |
| THE Books MAN Ltd | Professional & scientific | 2024 |
| THE Box Tree Restaurant Holdings Limited | Financial services | 2022 |