| Square Kitchens & Bathrooms Limited | Construction | 2014 |
| Square Land & Buildings Limited | Administrative & support | 2021 |
| Square One Advertising and Design (2008) Limited | Professional & scientific | 2008 |
| Square Orange Creative Limited | Professional & scientific | 2010 |
| Square Pear Landscaping Limited | Administrative & support | 2023 |
| Square Space Design Ltd | Professional & scientific | 2016 |
| Square Tours Limited | Administrative & support | 2024 |
| Squeaky Cleaners Sheffield Limited | Households | 2022 |
| Squeaky Group UK Limited | Administrative & support | 2022 |
| Squire Interiors Limited | Construction | 2003 |
| Squires Decorating Services Ltd | Construction | 2004 |
| Squires Tyres Ltd | Manufacturing | 2024 |
| Squirrel Investments Ltd | Financial services | 2023 |
| SR & SR Holdings Ltd | Professional & scientific | 2014 |
| SR Asian Cuisine Ltd | Hospitality | 2025 |
| SR Bridge Consulting Limited | Professional & scientific | 2015 |
| SR Clay Properties Ltd | Real estate | 2024 |
| SR Electrical (Yorkshire) Limited | Manufacturing | 2017 |
| SR Futures Ltd | Administrative & support | 2015 |
| SR Hird Plant Ltd | Construction | 2013 |
| SR Partnership Ltd | Administrative & support | 2004 |
| SR Paving & Groundworks Limited | Construction | 2005 |
| SR Raja Continental Foods Ltd | Wholesale & retail | 2025 |
| SR Smiles & Aesthetics Ltd | Health & social care | 2024 |
| SR Telecommunications Limited | Transport & logistics | 2022 |
| SRA Project & Cost Management Limited | Professional & scientific | 2015 |
| SRA Property Services Limited | Real estate | 2023 |
| Sraep Limited | Real estate | 2007 |
| SRB Joinery & Kitchen Fitting Limited | Construction | 2024 |
| SRB Surfacing Ltd | Construction | 2020 |
| Srbk Developments Limited | Real estate | 2023 |
| Srcms Ltd | Administrative & support | 2017 |
| Sree Sathya Lakshmi Company PVT Ltd | Health & social care | 2015 |
| Sreehil Ltd | Health & social care | 2017 |
| SRG Services (Yorkshire) Ltd | Wholesale & retail | 2024 |
| SRI Corporation Limited | Health & social care | 2013 |
| SRI Lankan Street Food Ltd | Hospitality | 2023 |
| SRI Mithran Retail Ltd | Wholesale & retail | 2024 |
| SRI Pharma Ltd | Wholesale & retail | 2023 |
| SRI Venkateshwara Healthcare UK Limited | Wholesale & retail | 2023 |
| SRI Vinayaka Healthcare UK Limited | Wholesale & retail | 2025 |
| Srine Services Limited | Hospitality | 2025 |
| Srivari Healthcare Limited | Health & social care | 2024 |
| SRJ Property Ltd | Real estate | 2016 |
| Srjc Limited | Financial services | 2018 |
| Srmg Property Ltd. | Real estate | 2016 |
| Srmg Restaurants Ltd | Hospitality | 2020 |
| SRN Travels Ltd | Transport & logistics | 2026 |
| SRR Golf Ltd | Arts & recreation | 2019 |
| Srrs Services Limited | Construction | 2020 |
| SRS Assets Limited | Financial services | 2023 |
| SRS Stairlift Repair Services Ltd | Manufacturing | 2019 |
| Srsr Enterprise Ltd | Construction | 2014 |
| Srsr Group Ltd | Real estate | 2016 |
| Srsr Properties Limited | Real estate | 2016 |
| SRT Brickwork Solutions Limited | Construction | 2014 |
| SRT Car Service Ltd | Wholesale & retail | 2026 |
| Sruhtiv Group Ltd | Information & communication | 2021 |
| SS (Derbyshire) Limited | Other services | 2019 |
| SS Automotive Cars Ltd | Wholesale & retail | 2019 |
| SS Cladding Ltd | Construction | 2025 |
| SS Electrical Engineering Ltd | Professional & scientific | 2021 |
| SS Investment Property Ltd | Real estate | 2025 |
| SS Loughton Pizzas Ltd | Hospitality | 2026 |
| SS Retreats Ltd | Real estate | 2025 |
| SS Ryan Limited | Wholesale & retail | 2019 |
| SS Sellersoultions Ltd | Wholesale & retail | 2026 |
| SS Shiloh Limited | Health & social care | 2019 |
| SS Transport Services Limited | Wholesale & retail | 2016 |
| SS Vindaloo Ltd | Hospitality | 2025 |
| Ss-Squared Limited | Real estate | 2020 |
| SSA Project Consulting Ltd | Information & communication | 2012 |
| Ssagala Ltd | Health & social care | 2026 |
| SSB Compliance Ltd | Professional & scientific | 2016 |
| SSD Construction Ltd | Construction | 2014 |
| Ssglabs Ltd | Information & communication | 2012 |
| SSH Solutions Ltd | Information & communication | 2014 |
| Sshafia Limited | Hospitality | 2025 |
| SSI (Britain) Limited. | Information & communication | 1997 |
| Ssind Trading Limited | Wholesale & retail | 2025 |
| Ssnc 24HR Caring Solutions PVT Ltd | Health & social care | 2021 |
| Ssource Ltd | Wholesale & retail | 2021 |
| Ssow Health and Safety Consultants Ltd | Professional & scientific | 2023 |
| SSP Estates Ltd | Real estate | 2023 |
| SSP Property Group Ltd | Real estate | 2025 |
| Sspp Property Investment Limited | Real estate | 2026 |
| SSS Casson Developments Ltd | Construction | 2019 |
| SSS Super Alloys Limited | Wholesale & retail | 2004 |
| Ssst Investments Ltd | Real estate | 2023 |
| SST (SY) Limited | Hospitality | 2015 |
| ST Albans Apartments Limited | Households | 2009 |
| ST Analytics Ltd | Professional & scientific | 2025 |
| ST Andrew's Court Health Care Limited | Health & social care | 2019 |
| ST Andrews Construction Limited | Construction | 2015 |
| ST Andrews Plaza Limited | Households | 2005 |
| ST Bridget Limited | Real estate | 2019 |
| ST Cecilias Social Club Ltd | Hospitality | 2017 |
| ST Clare Catholic Multi Academy Trust | Education | 2021 |
| ST CON Services Ltd | Construction | 2017 |
| ST Dunstan Homes Limited | Extraterritorial | 2014 |