| Sett Mortgages Limited | Financial services | 2024 |
| Setten Holdings Limited | Professional & scientific | 1920 |
| Setting OUT Solutions Group Limited | Administrative & support | 2024 |
| Sevans Holdings Limited | Financial services | 2022 |
| Sevans Investments Limited | Financial services | 2024 |
| Sevans Property Limited | Real estate | 2025 |
| Sevastian Ltd | Construction | 2021 |
| Seven Arts Leeds C.I.C. | Arts & recreation | 2003 |
| Seven by Jordan Limited | Wholesale & retail | 2025 |
| Seven Crystal Limited | Construction | 2023 |
| Seven Executive Ltd | Administrative & support | 2020 |
| Seven Hills Point (Morley) Management Company Limited | Households | 2009 |
| Seven Oceans Technologies Group Limited | Energy | 2023 |
| Seven Oceans Technology Ltd | Information & communication | 2023 |
| Seven Reasons Ltd | Professional & scientific | 2020 |
| Seven Search & Selection Limited | Administrative & support | 2009 |
| Seven Shield Security Ltd | Administrative & support | 2026 |
| Seven Signs Ltd | Construction | 2022 |
| Seventy 17 Ltd | Real estate | 2020 |
| Seventy Three Consulting Limited | Professional & scientific | 2025 |
| SEVENTY3 Group Holdings Ltd | Financial services | 2025 |
| SEVENTY3 Group Ltd | Education | 2025 |
| Seventyone Interiors Ltd | Professional & scientific | 2019 |
| Severin Programmes Limited | Professional & scientific | 2022 |
| SEW UP North Ltd | Wholesale & retail | 2025 |
| Sewa Medical Ltd | Health & social care | 2022 |
| Sewa Services Ltd. | Real estate | 2022 |
| Sewerline Ltd | Water & waste | 2020 |
| Sewertech Ltd | Water & waste | 2016 |
| Sewn Together Ltd | Wholesale & retail | 2021 |
| Sexton Capital Limited | Professional & scientific | 2021 |
| Seyh Ltd | Information & communication | 2008 |
| Seymour (C.E.C.) Holdings Limited | Professional & scientific | 2003 |
| Seymour (Civil Engineering Contractors) Ltd. | Construction | 1978 |
| Seymour Capital Limited | Hospitality | 1993 |
| SEZ Limited | Financial services | 2019 |
| SF Global Events Ltd | Arts & recreation | 2022 |
| SF Harker Builder and Developer Ltd | Construction | 2014 |
| SF Screening and Vaccination Service Ltd | Health & social care | 2016 |
| Sf-Tuning Ltd | Wholesale & retail | 2022 |
| SF13 Store Ltd | Wholesale & retail | 2022 |
| SFA Electrical Ltd | Construction | 2019 |
| SFA Solutions Ltd | Information & communication | 2022 |
| Sfam Properties Ltd | Real estate | 2026 |
| SFM Consultants Limited | Professional & scientific | 2019 |
| SFM Electrical and Security Systems Limited | Construction | 2015 |
| SFM Property Services Ltd | Administrative & support | 2023 |
| Sfmr Medical Limited | Health & social care | 2010 |
| SFP Real Estates Limited | Real estate | 2025 |
| SFR Plumbing & Heating Limited | Other services | 2018 |
| SFR Plumbing & Heating (Leeds) Ltd | Other services | 2021 |
| SFR Trading Ltd | Construction | 2017 |
| SFS Wealth Management Limited | Financial services | 2012 |
| SFT Structure Service Ltd | Construction | 2024 |
| SFX Joinery Limited | Construction | 2023 |
| SFZ Gary Griffiths Ltd | Professional & scientific | 2020 |
| SG Cars Limited | Wholesale & retail | 2015 |
| SG Commercial Street Ltd | Real estate | 2023 |
| SG Decorators Limited | Construction | 2020 |
| SG Eastgate Ltd | Real estate | 2025 |
| SG Heating and Air CON Ltd | Energy | 2024 |
| SG Inns Ltd | Hospitality | 2019 |
| SG M & E Ltd | Construction | 2026 |
| SG Oxford Place Ltd | Real estate | 2023 |
| SG Securities Ltd | Financial services | 2025 |
| SG Specialist Cars Ltd | Wholesale & retail | 2019 |
| SG07 Advisory Limited | Professional & scientific | 2025 |
| SGC Associates Limited | Information & communication | 2016 |
| SGG Consulting Limited | Professional & scientific | 2009 |
| SGH Sporting Events Limited | Administrative & support | 2015 |
| SGI Management Ltd | Administrative & support | 2017 |
| Sgibsonproperties Limited | Real estate | 2024 |
| SGM 2020 Ltd | Wholesale & retail | 2010 |
| SGM Machinery Ltd | Real estate | 2007 |
| SGM Sales Ltd | Wholesale & retail | 2015 |
| SGP Estates Ltd | Real estate | 2020 |
| SGP Maintenance Ltd | Construction | 2021 |
| SGR Business Limited | Administrative & support | 2025 |
| SGS Leeds Ltd | Administrative & support | 2019 |
| SGS Motors Ltd | Wholesale & retail | 2017 |
| Sgt-Global Talent Ltd | Arts & recreation | 2019 |
| SGT. Pepper Ltd | Hospitality | 2009 |
| Sgt.Smith Limited | Manufacturing | 2008 |
| SGW Graphic Design Limited | Information & communication | 2009 |
| SGW Properties Limited | Administrative & support | 2014 |
| Sgwl (Right to Manage) Company Limited | Households | 2023 |
| SH (10) Ltd | Real estate | 2024 |
| SH Building & Landscape Ltd | Construction | 2025 |
| SH Consultancy Leeds Ltd | Professional & scientific | 2026 |
| SH Consultancy Oakwood Limited | Professional & scientific | 2024 |
| SH Couriers Ltd | Transport & logistics | 2026 |
| SH Healthcare Services Limited | Financial services | 2015 |
| SH Ventures Ltd | Real estate | 2024 |
| Shaam Property Group Ltd | Construction | 2025 |
| Shaanz Crispy Ltd | Hospitality | 2026 |
| Shaas Creatives Ltd | Information & communication | 2026 |
| Shabab Express Limited | Hospitality | 2009 |
| Shabamber Ltd | Professional & scientific | 2021 |
| Shabir Healthcare Limited | Real estate | 2021 |
| Shack Fabs Limited | Manufacturing | 2024 |