| Nene Valley Accountancy Services Ltd | Professional & scientific | 2025 |
| Nola Hire Limited | Other services | 2019 |
| Northants Executive Travel Ltd | Transport & logistics | 2023 |
| Numbers Work Limited | Professional & scientific | 2011 |
| NUT Property Limited | Real estate | 2021 |
| Orchard House Clinic Ltd | Health & social care | 2009 |
| Partsbay Ltd | Wholesale & retail | 2018 |
| Paul Dakers Prophecy Limited | Professional & scientific | 2019 |
| PJH Brickwork Contractors Limited | Construction | 2017 |
| Plano Z Limited | Information & communication | 2016 |
| Portitor Ltd | Professional & scientific | 2018 |
| Pridmora Ltd | Administrative & support | 2025 |
| Print My Plates Ltd | Wholesale & retail | 2021 |
| Prior Park Properties Ltd | Real estate | 2019 |
| Priscy Limited | Health & social care | 2020 |
| Private Aesthetics Limited | Health & social care | 2018 |
| PROP8Y Ltd | Real estate | 2018 |
| Qualogy (2002) Limited | Professional & scientific | 2002 |
| R.Goodfellow (Builders) Limited | Construction | 1975 |
| Rectory Farm BA Limited | Construction | 2021 |
| Redstar Plumbing and Mechanical Services Limited | Administrative & support | 2010 |
| Rhsm Capital Limited | Financial services | 2021 |
| Rushden Osteopathic Clinic Limited | Health & social care | 2004 |
| Rutland Stone Ltd | Administrative & support | 2011 |
| S.O. Standbuilders Ltd | Administrative & support | 2025 |
| Scottco Holdings Limited | Manufacturing | 2013 |
| Scotts Timber Engineering Limited | Manufacturing | 2012 |
| Selectdec Ltd | Administrative & support | 2014 |
| Sellers Contracting Limited | Agriculture & fishing | 2020 |
| Sevastopol Advisors Limited | Administrative & support | 2013 |
| Sideshow Broadcast Limited | Professional & scientific | 2011 |
| Silverstone Material Handling Limited | Manufacturing | 2005 |
| Simply Tax Work Limited | Professional & scientific | 1996 |
| Simpson & Partners Holdings Limited | Professional & scientific | 2014 |
| Simpson & Partners Lettings Limited | Real estate | 2013 |
| Simpson & Partners Limited | Real estate | 2014 |
| Simpson & Partners New Homes Limited | Real estate | 2025 |
| Simpson & Weekley Limited | Real estate | 2003 |
| Simpson Ellson Limited | Real estate | 2025 |
| SLH Carpentry Services Ltd | Construction | 2023 |
| Snclr Ltd | Information & communication | 2026 |
| Sorabjee-Jones Ltd | Real estate | 2018 |
| Stamco BID Solutions Limited | Administrative & support | 2023 |
| Stoneyber Limited | Administrative & support | 2013 |
| Stratesgy Ltd | Professional & scientific | 2024 |
| Strawberry Media Marketing Ltd | Professional & scientific | 2025 |
| Swift Property 2 Ltd | Real estate | 2023 |
| T.W. Groundworks Ltd | Construction | 2018 |
| THE Brooke Weston Trust | Education | 1989 |
| THE Brotherhood B Limited | Other services | 2017 |
| THE Cascade Fund | | 2001 |
| THE KIN Tribe Limited | Administrative & support | 2014 |
| THE Little Gidding Trust Limited | Other services | 2004 |
| THE Mediation House Limited | Other services | 2024 |
| Thrive Strategic HR Solutions Limited | Administrative & support | 2018 |
| TIP Top Recordings Limited | Administrative & support | 2010 |
| TO Suit Limited | Real estate | 2000 |
| Top Corner Editorial and Design Limited | Information & communication | 2005 |
| TPM Social Work Consultancy Ltd | Administrative & support | 2012 |
| Trademark Polythene Ltd | Administrative & support | 2011 |
| Twywell BA Limited | Construction | 2021 |
| Unicorn Transport Limited | Transport & logistics | 2022 |
| Walker’S Flat Roofing Ltd | Construction | 2018 |
| Welland Design and Build Limited | Administrative & support | 2011 |
| Whitco UK Corporation Limited | Administrative & support | 2023 |
| Woodtech Paints Ltd | Wholesale & retail | 2019 |
| World Rubber Ltd | Administrative & support | 2011 |
| World Rubber UK Ltd | Administrative & support | 2011 |
| Yumyum Creative Limited | Administrative & support | 2009 |