| Sisterqueen Ltd | Manufacturing | 2022 |
| Sisuu Technologies Ltd | Information & communication | 2023 |
| SIT Stay Walkies Ltd | Other services | 2020 |
| SIT With ME Companionship Limited | Other services | 2025 |
| Sitara Restaurant (UK) Limited | Hospitality | 2007 |
| Site & Stay Ltd | Real estate | 2025 |
| Site Engineer Training Ltd | Professional & scientific | 2022 |
| Site Manager Services Limited | Administrative & support | 2015 |
| Site Supplies Direct Limited | Manufacturing | 2013 |
| Sitevision Limited | Construction | 2025 |
| Sitra Accommodation Ltd | Real estate | 2021 |
| Sitra Driving School Ltd | Professional & scientific | 2014 |
| Sitting Duck Ltd | Wholesale & retail | 2011 |
| Sivanandan Doctors Ltd | Health & social care | 2025 |
| SIX Degrees Associates Limited | Professional & scientific | 2021 |
| SIX Degrees Derby Ltd | Construction | 2021 |
| SIX Degrees Leicester Ltd | Construction | 2022 |
| SIX Degrees Loughborough Ltd | Construction | 2021 |
| SIX Degrees Nottingham Ltd | Real estate | 2016 |
| SIX Degrees S1 Ltd | Construction | 2022 |
| SIX Degrees Sheff Ltd | Financial services | 2016 |
| SIX EZ Limited | Professional & scientific | 2017 |
| SIX Hills Welding Supplies Limited | Professional & scientific | 2022 |
| SIX Housing Ltd | Real estate | 2025 |
| SIX Minutes Past Nine Ltd | Education | 2023 |
| SIX Pines Limited | Administrative & support | 2020 |
| SIX Richmond House Ltd | Hospitality | 2022 |
| SIX Serving MEN Limited | Information & communication | 2007 |
| SIX Telecom Limited | Information & communication | 2025 |
| SIX Till SIX Ltd. | Administrative & support | 2014 |
| SIX- Sycamore Limited | Financial services | 2024 |
| Sixteen Iris Ltd | Arts & recreation | 2024 |
| Sixteen Millicent Road Management Limited | Households | 1990 |
| Sixth Gear Solutions Limited | Professional & scientific | 2017 |
| Sixtous Company Ltd | Manufacturing | 2021 |
| Sixty Shilling Brewing Ltd | Manufacturing | 2006 |
| SIXTY6 Services Limited | Wholesale & retail | 2018 |
| Sizewell Property Limited | Hospitality | 2024 |
| Sizzler Grill House Ltd | Hospitality | 2019 |
| Sizzler Grill House Notts Ltd | Hospitality | 2020 |
| Sizzling Shack Ltd | Hospitality | 2024 |
| SJ Garden Maintenance Ltd | Administrative & support | 2026 |
| SJ Logans PCB Ltd | Hospitality | 2025 |
| SJ OWL Management Services Ltd | Information & communication | 2010 |
| SJ Pickering Consulting Limited | Professional & scientific | 2023 |
| SJ Solutions PVT Ltd | Information & communication | 2018 |
| SJ Telford Consultancy Limited | Information & communication | 2021 |
| SJ Telford Investments Ltd | Real estate | 2024 |
| SJ Therapy Services Limited | Education | 2016 |
| SJ Thomson Ltd | Information & communication | 2022 |
| Sj&T Care Solutions Ltd | Administrative & support | 2024 |
| SJA Inavations Ltd | Hospitality | 2025 |
| SJA Lettings Limited | Real estate | 2022 |
| SJB Aviation Ltd | Professional & scientific | 2025 |
| SJB SRB Ventures Limited | Professional & scientific | 2025 |
| SJC 14 Limited | Real estate | 1997 |
| SJC 15 Limited | Hospitality | 1997 |
| SJG Project Solutions Limited | Professional & scientific | 2025 |
| SJG Surveying Limited | Administrative & support | 2012 |
| SJH Property Management Ltd | Real estate | 2024 |
| SJJ Trading Ltd | Wholesale & retail | 2022 |
| Sjjw Automotive Limited | Wholesale & retail | 2018 |
| SJK Services Limited | Construction | 2004 |
| SJL Plumbing and Bathrooms Ltd | Construction | 2024 |
| Sjlh Group Ltd | Professional & scientific | 2026 |
| SJM Management Limited | Professional & scientific | 2009 |
| Sjmilham Consulting Limited | Professional & scientific | 2021 |
| Sjmsy Limited | Wholesale & retail | 2020 |
| SJN Catering Ltd | Hospitality | 2024 |
| SJN Vending Ltd | Hospitality | 2023 |
| Sjot Ltd | Health & social care | 2013 |
| SJP Comms Limited | Information & communication | 2011 |
| Sjri Consultancy Limited | Professional & scientific | 2023 |
| Sjri Freehold Limited | Real estate | 2022 |
| Sjri Property Limited | Real estate | 2022 |
| Sjrn Property Ltd | Real estate | 2024 |
| SJS Direct Limited | Wholesale & retail | 2009 |
| SJS Nottingham LLP | | 2023 |
| SJS PUB Limited | Hospitality | 2015 |
| SJS Referral Ltd | Health & social care | 2023 |
| Sjtbodyworks Ltd | Wholesale & retail | 2026 |
| SJV Consultants Limited | Professional & scientific | 2019 |
| SJW Property Portfolio Ltd | Real estate | 2016 |
| Sjwatson Electrical Services Limited | Construction | 2025 |
| SJY Limited | Manufacturing | 2004 |
| Sj’S Kitchen Ltd | Hospitality | 2024 |
| SK & KK Property Portfolio Ltd | Real estate | 2026 |
| SK Accounting Solutions Limited | Professional & scientific | 2006 |
| SK Beauty Nottingham Ltd | Other services | 2026 |
| SK Builds Ltd | Construction | 2024 |
| SK Clothing Wholesale Limited | Wholesale & retail | 2020 |
| SK Colourhill Ltd | Other services | 2019 |
| SK Desserts Ltd | Hospitality | 2026 |
| SK Energy Consulting Ltd | Administrative & support | 2015 |
| SK HR and Payroll Consultancy Services Ltd | Professional & scientific | 2018 |
| SK Legal Solutions Ltd | Professional & scientific | 2018 |
| SK Management & Consultancy Limited | Professional & scientific | 2026 |
| SK Medical Solutions Ltd | Health & social care | 2024 |
| SK Nottingham Ltd | Real estate | 2016 |
| SK Oral Health Ltd | Health & social care | 2025 |