| St.Bernards Mills Limited | Construction | 1959 |
| ST87 Media Ltd | Information & communication | 2023 |
| Staa Consulting Limited | Administrative & support | 2023 |
| Stabby (Leeds) Ltd | Other services | 2025 |
| Stable Garage (Leeds) Limited | Wholesale & retail | 2010 |
| Stable Maintenance Limited | Households | 2001 |
| Stable View Equestrian Centre Limited | Agriculture & fishing | 2019 |
| Stacey Pelham Partnership Limited | Professional & scientific | 2014 |
| Stacey Travel Consultants Ltd | Administrative & support | 2024 |
| Stacey-Ebby Limited | Extraterritorial | 1956 |
| Stacey-Emily Financial Services Limited | Financial services | 2020 |
| Stack Architects Limited | Professional & scientific | 2010 |
| Stacked Brands Ltd | Professional & scientific | 2012 |
| Stacked Catering Ltd | Hospitality | 2025 |
| Stacked House of Food Ltd | Hospitality | 2025 |
| Stackrise Ltd | Information & communication | 2025 |
| Stackwork Limited | Administrative & support | 2025 |
| Stadium Electrical Products Limited | Manufacturing | 1984 |
| Staff Cleaning Ltd | Administrative & support | 2022 |
| Staff Personal Recruitment Ltd | Administrative & support | 2025 |
| Staff Point Services Ltd | Administrative & support | 2016 |
| Stafflytics Ltd | Administrative & support | 2026 |
| Staffs Metal Recycling Limited | Water & waste | 2012 |
| Stag Cabinet Company Limited(The) | Professional & scientific | 1963 |
| Stag Mackenzie Holdings Ltd | Financial services | 2023 |
| Stag PCT (Holdco) Limited | Health & social care | 2008 |
| Stag PCT (Projectco) Limited | Health & social care | 2008 |
| Stag Properties Leeds Limited | Real estate | 2023 |
| Stag Wood Investments Limited | Financial services | 2019 |
| Stage & Event Joinery Ltd | Construction | 2016 |
| Stage 1 Motors Ltd | Wholesale & retail | 2025 |
| Stage Coffee Ltd | Hospitality | 2016 |
| Stage Door Tenby Bar Ltd | Hospitality | 2020 |
| Stage Door Tenby Ltd | Hospitality | 2019 |
| Stage Kidz Performing Arts School Ltd | Education | 2022 |
| Stagslax Limited | Manufacturing | 1989 |
| Stagsvshens Limited | Administrative & support | 2019 |
| Stahream Ltd | Information & communication | 2017 |
| Stainbeck Property Investments Limited | Real estate | 2019 |
| Stainburn Electrical and Entertainment Services Limited | Construction | 1991 |
| Stainburn Limited | Wholesale & retail | 2018 |
| Stainless Hub Limited | Wholesale & retail | 2018 |
| Stainless Steel Vessels Holdings Ltd | Financial services | 2022 |
| Stainless Steel Vessels Limited | Manufacturing | 2014 |
| Stak Softwares Limited | Wholesale & retail | 2024 |
| Stakes IS High Property Limited | Real estate | 2024 |
| Stalbet Ltd | Professional & scientific | 2019 |
| Stama Cleaning Ltd | Administrative & support | 2025 |
| Stamat Developments Limited | Real estate | 2005 |
| Stamford and Hart Limited | Real estate | 2023 |
| Stamina Handling Limited | Manufacturing | 2005 |
| Stamp Duty Experts Ltd | Other services | 2024 |
| Stampede Global UK Limited | Wholesale & retail | 2005 |
| Stampers Craft Sponge Shapes Ltd | Manufacturing | 2025 |
| Stan Somers (Racing) Limited | Arts & recreation | 1999 |
| Stan Weston LLP | | 2015 |
| Stanation Limited | Administrative & support | 2008 |
| Stanbrook Morgan Limited | Administrative & support | 2020 |
| Stanbrook Morgan Properties Limited | Real estate | 2023 |
| Stancliffe Pharmacy Limited | Wholesale & retail | 2002 |
| Stand Magazine Limited | Information & communication | 1981 |
| Stand OUT Enterprises Limited | Wholesale & retail | 2022 |
| Stand Sure Property Ltd | Real estate | 2023 |
| Stand UP People Limited | Information & communication | 2026 |
| Standah Properties Ltd | Real estate | 2019 |
| Standard Parts Distribute Centre (UK) Ltd | Manufacturing | 2017 |
| Standard Procedure Ltd | Information & communication | 2023 |
| Standeven Developments Limited | Construction | 2012 |
| Standit Displays Ltd | Administrative & support | 2008 |
| Standout Interior Designs Limited | Professional & scientific | 2025 |
| Stanford Finance Ltd | Financial services | 2022 |
| Stanford Group Holdings Ltd | Financial services | 2023 |
| Stanford Medical Ltd | Health & social care | 2023 |
| Stanhope Contractors Ltd | Construction | 2025 |
| Stanhope Court RTM Company Limited | Households | 2013 |
| Staniforth Electrical Ltd | Construction | 2018 |
| Stanley & Co. Studio Ltd | Professional & scientific | 2022 |
| Stanley D Ltd | Construction | 2023 |
| Stanningley Cars (Leeds) Ltd | Transport & logistics | 2019 |
| Stanningley Food Limited | Extraterritorial | 2017 |
| Stanningley Hall Limited | Real estate | 2007 |
| Stanningley Wine Shop Ltd | Wholesale & retail | 2020 |
| Stannum Resources Limited | Mining & quarrying | 2010 |
| Stantons GM Ltd | Wholesale & retail | 2021 |
| Staple Hill Investments Ltd | Professional & scientific | 2024 |
| Staple Hill Management Ltd | Professional & scientific | 2024 |
| Stapleton Gardner Limited | Professional & scientific | 2014 |
| Star a Ltd | Administrative & support | 2025 |
| Star Asset Holdings Limited | Real estate | 2022 |
| Star Biotech and Health Ltd | Wholesale & retail | 2026 |
| Star Care Group Ltd | Financial services | 2024 |
| Star Carers Ltd | Health & social care | 2023 |
| Star Ccompany Limited | Health & social care | 2024 |
| Star East Wakefield Limited | Hospitality | 2025 |
| Star Executive Travel Limited | Administrative & support | 2022 |
| Star Fabric Limited | Other services | 2006 |
| Star Geomatics Ltd | Construction | 2022 |
| Star Group of Companies Limited (the) | Hospitality | 1975 |
| Star Healthcare Solutions Limited | Health & social care | 2016 |
| Star Marquees Ltd | Administrative & support | 2025 |