| SUE Watson Limited | Education | 1994 |
| Suefa Jerk Centre Ltd | Hospitality | 2022 |
| Sueno Ltd | Wholesale & retail | 2020 |
| Sufaxsf Ltd | Transport & logistics | 2025 |
| Suffield Motors Limited | Wholesale & retail | 2006 |
| Sufyaan Property Ltd | Real estate | 2026 |
| Sugar Kiss Ltd | Hospitality | 2025 |
| Sugar Rush Sweeties Ltd | Wholesale & retail | 2020 |
| Suggitt Real Estate Limited | Real estate | 2025 |
| Sugra Limited | Health & social care | 2014 |
| SUI Saddlery Limited | Wholesale & retail | 2025 |
| Suite Dreams Ltd | Hospitality | 2025 |
| Suite Trends Limited | Wholesale & retail | 2005 |
| Suiteweb Limited | Information & communication | 2020 |
| Sukaran Ltd | Information & communication | 2006 |
| Sukhada Ltd | Real estate | 2021 |
| Sukhmani Coaching Ltd | Professional & scientific | 2017 |
| Sukho Group Limited | Financial services | 2019 |
| Sukho Limited | Hospitality | 2003 |
| Sukho Properties Limited | Real estate | 2019 |
| Sukho Zaap Holdings Limited | Financial services | 2026 |
| Sukhothai Restaurants (Leeds) Limited | Hospitality | 2011 |
| Sukhothai Restaurants Harrogate Limited | Hospitality | 2010 |
| Sulaco Services Ltd | Information & communication | 2022 |
| Sulaimani Restaurant Ltd | Hospitality | 2025 |
| Sulastar Limited | Real estate | 1974 |
| Suleman Associates Ltd | Professional & scientific | 2009 |
| Suli Beauty Ltd | Other services | 2024 |
| Suli Fade Limited | Other services | 2024 |
| Sulki Limited | Real estate | 2023 |
| Sulltan Cuts Ltd | Other services | 2025 |
| Sully's Dog Grooming Ltd | Other services | 2024 |
| Sultan Globalinx Ltd | Wholesale & retail | 2025 |
| Sultan Sweet House Ltd | Hospitality | 2022 |
| Sultan Takeaway Leeds Ltd | Hospitality | 2024 |
| Sultas Auto Specialists Limited | Wholesale & retail | 2010 |
| Sulzer Limited | Professional & scientific | 1993 |
| Sulzer Services (UK) Limited | Administrative & support | 1932 |
| SUM HUP Limited | Hospitality | 2026 |
| SUM Limited | Professional & scientific | 2002 |
| Suma Foods Limited | Wholesale & retail | 2020 |
| Suma Infotech Ltd | Information & communication | 2023 |
| Suma OFF Licence Ltd | Wholesale & retail | 2024 |
| Suma Software Solutions Limited | Information & communication | 2021 |
| Sumaco Cleaning Services Ltd | Administrative & support | 2026 |
| Suman Property Solutions Ltd | Real estate | 2021 |
| Sumara Technologies Limited | Professional & scientific | 2017 |
| Sumayya Hair & Cosmetics Ltd | Other services | 2020 |
| Sumika Ltd | Real estate | 2026 |
| Summat Sweet Ltd | Hospitality | 2024 |
| Summer Cross Limited | Health & social care | 2021 |
| Summer RAE Hill Ltd | Real estate | 2022 |
| Summerfield (Ilkley) Management Limited | Households | 1998 |
| Summerhill Amenities Limited | Households | 1982 |
| Summerhill Court Management Company Limited | Households | 2009 |
| Summerhose Limited | Transport & logistics | 1997 |
| Summerhouse Edits Limited | Administrative & support | 2005 |
| Summers Co Holdings Ltd | Financial services | 2025 |
| Summers Co Investments Ltd | Real estate | 2025 |
| Summers Medical Services Ltd | Health & social care | 2026 |
| Summertown Martials Arts Hub Ltd | Arts & recreation | 2024 |
| Summit Healthcare (Dudley) Limited | Administrative & support | 2001 |
| Summit Holdings (Dudley) Limited | Financial services | 2001 |
| Summit IT Group Ltd | Wholesale & retail | 2026 |
| Summit Networks Ltd | Information & communication | 2025 |
| Summit Properties Yorkshire Ltd | Real estate | 2025 |
| Summit Select Ltd | Administrative & support | 2025 |
| Summit Works Ltd | Manufacturing | 2024 |
| Summitline Developments Ltd | Administrative & support | 2025 |
| Sumner Technology Services Ltd | Information & communication | 2023 |
| Sun Bibi Limited | Wholesale & retail | 2021 |
| Sun Business Consulting Ltd | Information & communication | 2004 |
| Sun Centre (NE) Limited | Professional & scientific | 2003 |
| Sun Corp Ltd | Real estate | 2025 |
| Sun in the Garden Limited | Information & communication | 2015 |
| Sun Power Group Ltd | Wholesale & retail | 2017 |
| Sun Rays Security Services Limited | Administrative & support | 2014 |
| Sun Station Leeds Ltd | Other services | 2022 |
| Sun Suites UK Ltd | Real estate | 2021 |
| Sun Therapy Ltd | Other services | 2025 |
| Suna Healthcare Ltd | Health & social care | 2025 |
| Sunbeam Digital Ltd | Information & communication | 2025 |
| Sunbeams Early Years Limited | Education | 2015 |
| Sunbridge Finance Limited | Professional & scientific | 1964 |
| Sunbridge Properties Limited | Real estate | 1999 |
| Sunbridge Wells Limited | Real estate | 2012 |
| Suncap Visa Ltd | Professional & scientific | 2023 |
| Sunday's Desserts Limited | Wholesale & retail | 2024 |
| Sundays Travel Ltd | Information & communication | 2026 |
| Sundayskin-Uk Ltd | Other services | 2023 |
| Sunderland Car Centre Limited | Wholesale & retail | 2007 |
| Sunderland Energy Limited | Construction | 2025 |
| Sundridge Search Limited | Administrative & support | 2018 |
| Sundrop Marketing Ltd | Information & communication | 2025 |
| Sunfield Harrison Limited | Manufacturing | 1939 |
| Sunflower Audio Ltd | Manufacturing | 2026 |
| Sunflower Bakery (Thirsk) Limited | Hospitality | 2023 |
| Sunflower Bakery Limited | Manufacturing | 2017 |
| Sunflower Environmental Limited | Professional & scientific | 2026 |
| Sunflower Garden Cash and Carry Ltd | Agriculture & fishing | 2019 |