| S & N Cleaners Limited | Administrative & support | 2026 |
| S & P Projects and Developments Limited | Construction | 2007 |
| S & P Your Local Store Ltd | Wholesale & retail | 2024 |
| S & R Northants Ltd | Construction | 2015 |
| S & R Operations Limited | Administrative & support | 2023 |
| S & V Irving & Sons Ltd | Real estate | 2026 |
| S a Cars 24 Limited | Transport & logistics | 2025 |
| S a Kellegher Limited | Financial services | 2016 |
| S and a Finance Limited | Financial services | 2017 |
| S Burton Limited | Construction | 2007 |
| S C (Northampton) Limited | Construction | 2025 |
| S C James Ltd | Construction | 2019 |
| S C LEE Accountant Limited | Professional & scientific | 2007 |
| S Chaudhury Accountancy Services Limited | Professional & scientific | 2020 |
| S D Price Limited | Information & communication | 2008 |
| S Fenning Property and Maintenance Services Limited | Construction | 2005 |
| S G & Associates Limited | Professional & scientific | 2006 |
| S Gidwani Ltd | Health & social care | 2014 |
| S H Adderley Limited | Information & communication | 1997 |
| S Hillyards Ltd | Transport & logistics | 2025 |
| S Hogben Services Limited | Professional & scientific | 2015 |
| S J & M Hammon Ltd | Real estate | 2021 |
| S J & M J Nightingale Limited | Construction | 2004 |
| S J Brown Engineering Limited | Wholesale & retail | 2009 |
| S J Building Group Limited | Construction | 2019 |
| S J Scott & Associates Ltd | Health & social care | 2016 |
| S K Tiling Ltd | Construction | 2017 |
| S Macswan Building & Design Ltd | Construction | 2016 |
| S Mcube Ltd | Wholesale & retail | 2024 |
| S Moorhouse Construction Limited | Construction | 2026 |
| S Morari Ltd | Transport & logistics | 2022 |
| S P S Speciality Painting Service Ltd | Construction | 2019 |
| S R Rugge Consultancy Ltd | Information & communication | 2014 |
| S Reynolds Electrical Contractors Ltd | Construction | 2025 |
| S Run Ltd | Transport & logistics | 2024 |
| S S Developments (Northampton) Ltd | Construction | 2016 |
| S S Properties (Northampton) Ltd | Real estate | 2017 |
| S V Roofing Services Ltd | Construction | 2019 |
| S W Quinn Consultancy Ltd | Professional & scientific | 2019 |
| S Wilkinson Consulting Ltd | Information & communication | 2014 |
| S&A Interiors Limited | Construction | 2015 |
| S&A Rusu Co. Ltd | Construction | 2026 |
| S&A Skip Hire Limited | Water & waste | 2019 |
| S&B Worldwide Limited | Hospitality | 2024 |
| S&C Beauty Treatment Ltd | Other services | 2019 |
| S&C Workwear and Embroidery Solutions Ltd | Manufacturing | 2026 |
| S&Duk Limited | Real estate | 2021 |
| S&G Team Limited | Wholesale & retail | 2019 |
| S&J Consultancy Ltd | Administrative & support | 2016 |
| S&L Catering Limited | Hospitality | 2020 |
| S&M Cars Northampton Limited | Wholesale & retail | 2025 |
| S&M Investment Properties Ltd | Real estate | 2026 |
| S&M Property Group Ltd | Real estate | 2026 |
| S&N Electrical Group Ltd | Construction | 2024 |
| S&O Solution Limited | Information & communication | 2023 |
| S&P Property Maintenance Ltd | Real estate | 2026 |
| S&P Store Ltd | Wholesale & retail | 2017 |
| S&Q Solutions Limited | Construction | 2013 |
| S&S Electrical Installations Ltd | Construction | 2017 |
| S&S Flooring Limited | Construction | 2022 |
| S&S Minimarket Ltd | Wholesale & retail | 2026 |
| S&S Northampton Limited | Wholesale & retail | 2025 |
| S&S Roofing Installations Ltd | Construction | 2021 |
| S&T Building & Maintenance Ltd | Construction | 2026 |
| S&T Group Ltd | Wholesale & retail | 2016 |
| S&T(Uk) Limited | Construction | 2011 |
| S&V Couriers Ltd | Transport & logistics | 2019 |
| S-Impl Innovate Limited | Information & communication | 2026 |
| S-Thete Ltd | Agriculture & fishing | 2022 |
| S. & J. Graveson Limited | Construction | 1982 |
| S. H. J. Engineering Limited | Professional & scientific | 2011 |
| S. Lancho Roofing Ltd | Construction | 2023 |
| S. R. Gill Builders Limited | Construction | 2016 |
| S.A.F. Co (Services) Limited | Transport & logistics | 1999 |
| S.A.T. Salons Limited | Other services | 2013 |
| S.A.Z.E Property Ltd | Real estate | 2024 |
| S.C Evans Property Services Ltd | Households | 2025 |
| S.Curtis & Sons (Roofing & Property Maintenance) Ltd | Construction | 2008 |
| S.D Fair Shipping Ltd | Transport & logistics | 2018 |
| S.D.D. Nitu Ltd | Transport & logistics | 2019 |
| S.D.D.Brickwork Ltd | Construction | 2023 |
| S.E. Advanced Builder Ltd | Construction | 2021 |
| S.E.C. Electrical Limited | Construction | 1955 |
| S.H.I.P.P. Limited | Energy | 2008 |
| S.M.P Focused Ltd | Construction | 2015 |
| S.Maniam Ltd | Real estate | 2025 |
| S.O.R Signal Engineer Support Services Limited | Administrative & support | 2025 |
| S.P Haulage Ltd | Transport & logistics | 2019 |
| S.P Transport & Logistics Limited | Transport & logistics | 2026 |
| S.P.Jelley Ltd | Administrative & support | 2006 |
| S.R.Z. Limited | Construction | 2011 |
| S.T.A.K Installations & Servicing Ltd | Professional & scientific | 2025 |
| S.T.A.R Northampton Ltd | Administrative & support | 2014 |
| S.U.P. Contracting Limited | Extraterritorial | 2019 |
| S.W. Wreford Holdings Limited | Financial services | 2025 |
| S.W. Wreford Warehousing Company Limited | Other services | 1951 |
| S.W.Wreford & Sons.Limited | Transport & logistics | 1941 |
| S/G Removals Ltd | Transport & logistics | 2023 |
| S1GMA Ltd | Information & communication | 2023 |
| S2A2S Limited | Professional & scientific | 2012 |