| Stable Hire Holdings Limited | Financial services | 2026 |
| Stable Hire Vehicle Services Ltd | Manufacturing | 1998 |
| Stablehire Ltd | Administrative & support | 2002 |
| Stacey Simms Ltd | Real estate | 2020 |
| Stagecraft Visual Communications Limited | Administrative & support | 1999 |
| Stamford Carpet Co. Ltd | Construction | 2024 |
| Standby Operations Ltd | Extraterritorial | 2023 |
| Star Radiology Services Limited | Health & social care | 2024 |
| Starling Ltd | Professional & scientific | 2009 |
| Stef & COS Concept Limited | Transport & logistics | 2018 |
| Sterling Polymers Ltd | Water & waste | 2021 |
| Sterling Safetywear Limited | Wholesale & retail | 1998 |
| Stevie & T Educational Services Ltd | Education | 2022 |
| Stonebreak Design Consultants Limited | Administrative & support | 2002 |
| Storage Design Services Ltd | Administrative & support | 2024 |
| Streetwise Directory Ltd | Professional & scientific | 2025 |
| Strs PVT Ltd | Wholesale & retail | 2024 |
| Style News Ltd | Information & communication | 2018 |
| Success Local Limited | Information & communication | 2016 |
| Summer Breeze Holidays Ltd | Administrative & support | 2018 |
| Supply Recruitment Group Limited | Real estate | 2011 |
| Supply Technical Limited | Administrative & support | 2011 |
| Suresh Optics Ltd | Health & social care | 2025 |
| Sutherland Fundraising Limited | Professional & scientific | 2017 |
| Sutherland Williams Ltd | Professional & scientific | 2025 |
| Swedish Kitchen (Wellingborough) Limited | Hospitality | 2021 |
| Sweetie Darling Ltd | Information & communication | 2020 |
| Sworks Management LLP | | 2023 |
| Symons Solutions Ltd | Administrative & support | 2017 |
| Szczygielpina Ltd | Transport & logistics | 2021 |
| T C Coomber Limited | Wholesale & retail | 2018 |
| T R Lawman (Holdings) Limited | Professional & scientific | 2005 |
| T W Squared Developments Limited | Construction | 2013 |
| T W Squared Properties Limited | Real estate | 2015 |
| T.K.Speed Ltd | Transport & logistics | 2025 |
| T.R.Lawman Limited | Manufacturing | 1964 |
| T3 Signs Limited | Manufacturing | 2014 |
| Tado Prime Ltd | Construction | 2026 |
| Tafani Investment Ltd | Real estate | 2025 |
| Talbot Lettings Limited | Real estate | 2019 |
| Tarnya's DA Service Ltd | Administrative & support | 2025 |
| Taste Designer Ltd | Hospitality | 2024 |
| Tatt Plumbing & Heating Limited | Construction | 2016 |
| Tavara Limited | Professional & scientific | 2004 |
| Tax & Services Limited | Administrative & support | 2019 |
| Taylormade CMM Solutions Ltd | Professional & scientific | 2015 |
| TBF Services Limited | Professional & scientific | 2018 |
| TC Polishing Ltd | Wholesale & retail | 2026 |
| TCE Services Ltd | Construction | 2020 |
| Teaching 4 Business Limited | Information & communication | 2004 |
| Teather Aviation Services Limited | Manufacturing | 2004 |
| Tebro (Nationwide) Construction Limited | | 1982 |
| TED Epic Ltd | Financial services | 2024 |
| Teeq Supplements Ltd. | Wholesale & retail | 2026 |
| Telephone and More Ltd | Administrative & support | 2019 |
| Temify Ltd | Hospitality | 2024 |
| Tenn Ltd | Wholesale & retail | 2024 |
| Teodor Security Services Ltd | Administrative & support | 2013 |
| TGI Developments Limited | Construction | 2022 |
| Thabo Ltd | Health & social care | 2012 |
| THE Accounts Ladies Limited | Education | 2021 |
| THE Accounts Office Limited | Education | 2023 |
| THE Albion Asset Services Ltd | Professional & scientific | 2022 |
| THE Auden Musical Instrument Company Limited | Manufacturing | 2013 |
| THE Bajan Trading Company Limited | Wholesale & retail | 2007 |
| THE Clear Brief Ltd | Professional & scientific | 2025 |
| THE Cream Horne Limited | Hospitality | 2003 |
| THE Deli (Rushden) Limited | Hospitality | 2024 |
| THE Digital Build Company Ltd | Construction | 2019 |
| THE Electronic Gate Company Limited | Construction | 2024 |
| THE Eliminator Ltd | Agriculture & fishing | 2016 |
| THE European Shoe Machinery Company Limited | Manufacturing | 1996 |
| THE Event of Champions Ltd | Other services | 2016 |
| THE Evolve Skills Academy Ltd | Education | 2015 |
| THE Fatherhood Project C.I.C. | Education | 2023 |
| THE Good Oval Ltd | Hospitality | 2026 |
| THE Heartspace Project Limited | Health & social care | 2018 |
| THE Hedges Inc Ltd | Wholesale & retail | 2024 |
| THE Hewitt Building Company Limited | Construction | 2010 |
| THE Hilly Farm Management Company Limited | Households | 2007 |
| THE Home Improvement Studio (Trade) Limited | Manufacturing | 2016 |
| THE King Billy Bar Limited | Hospitality | 2021 |
| THE Misco Group Limited | Information & communication | 2019 |
| THE Moody COW Higham Ferrers Ltd | Hospitality | 2026 |
| THE Old Band LLP | | 2020 |
| THE Old Growlers Garage Limited | Wholesale & retail | 2021 |
| THE Osteopathy Clinic (Hendon) Ltd | Health & social care | 2016 |
| THE Pet Transpawter Limited | Administrative & support | 2025 |
| THE Phoenix Resource Centre (Northampton) Limited | Water & waste | 2009 |
| THE Phoenix Resource Centre Ltd | Water & waste | 2009 |
| THE Pleasure Gardens Distilling Company Ltd. | Administrative & support | 2016 |
| THE Printing Shed Ltd | Manufacturing | 2025 |
| THE Property Builder Ltd | Real estate | 2024 |
| THE River Nene Canoe Hire Co. Ltd | Arts & recreation | 2009 |
| THE Self Building Ltd | Construction | 2021 |
| THE Squires Gate Lakeside Management Company Limited | Households | 2004 |
| THE Strength and Conditioning Gym Ltd | Extraterritorial | 2022 |
| THE SUP Centre Ltd | Arts & recreation | 2022 |
| THE Three Kernels Ltd | Hospitality | 2025 |
| Think Hatch Limited | Administrative & support | 2012 |