| 24 Capra Trans Limited | Transport & logistics | 2022 |
| 24 Church Street RTM Company Limited | Households | 2020 |
| 24 SE7EN Accountants Limited | Professional & scientific | 2005 |
| 24 Seven Taxi Northampton Ltd | Transport & logistics | 2016 |
| 24 Yards Ltd | Arts & recreation | 2016 |
| 247 Transport Limited | Transport & logistics | 2021 |
| 247 VIP Ltd | Transport & logistics | 2024 |
| 2471SERVICES Ltd | Transport & logistics | 2020 |
| 24A Church Street RTM Company Limited | Households | 2020 |
| 25-31 Woodlands Court RTM Company Ltd | Households | 2026 |
| 27 to 29 Henry Bird Way RTM Company Limited | Households | 2024 |
| 27-33 Southgate Drive RTM Company Limited | Households | 2018 |
| 274 Holloway Road Ltd | Hospitality | 2017 |
| 28 Knots Ltd | Administrative & support | 2011 |
| 28 Portland Place Limited | Real estate | 2026 |
| 2911 Management Limited | Professional & scientific | 2026 |
| 2AGES Projects Ltd | Manufacturing | 2024 |
| 2B Fixing Limited | Construction | 2014 |
| 2BROTHER4OLIVES UK Ltd | Wholesale & retail | 2024 |
| 2C Design Consultants Limited | Professional & scientific | 2004 |
| 2CEDARS Ltd | Professional & scientific | 2018 |
| 2CFUTURES Ltd | Professional & scientific | 2022 |
| 2COND Chance Bargain Limited | Wholesale & retail | 2025 |
| 2G Management Consultants Ltd | Transport & logistics | 2021 |
| 2NWEST Builders and Decorators Ltd | Construction | 2012 |
| 2P Solutions Ltd | Education | 2012 |
| 2YE Limited | Professional & scientific | 2023 |
| 3 Buffalo Security Services Ltd | Administrative & support | 2020 |
| 3 Cranwood Street Property Limited | Real estate | 2024 |
| 3 Dogs & Cat Ltd | Agriculture & fishing | 2024 |
| 3 Seagulls Transport Solutions Ltd | Transport & logistics | 2018 |
| 3 Spencer Parade Limited | Real estate | 2022 |
| 3 Teign Street Limited | Hospitality | 2017 |
| 3 V Gold Ltd | Construction | 2025 |
| 3 V Medicolegal Services Limited | Health & social care | 2019 |
| 3 Ways Transport Limited | Transport & logistics | 2010 |
| 3-7 Hazelwood Road Northampton Freehold Limited | Households | 2015 |
| 3-D CAD Creations Limited | Information & communication | 2007 |
| 32 the Guild Limited | Wholesale & retail | 2012 |
| 33 Enterprises Ltd | Other services | 2022 |
| 33 Reasons Ltd | Arts & recreation | 2022 |
| 33BH Ltd | Information & communication | 2024 |
| 33LONDON Limited | Administrative & support | 2006 |
| 345-VQ (UK) Limited | Information & communication | 2020 |
| 35 Semilong Road Ltd | Households | 2020 |
| 36 Inkerman Road London Limited | Households | 2003 |
| 360 Degree Brewing Company Ltd | Manufacturing | 2003 |
| 360 Eco Energy Ltd | Construction | 2023 |
| 360 Food Partners (Buy) Ltd | Wholesale & retail | 2026 |
| 360 Food Partners (Procurement) Limited | Wholesale & retail | 2024 |
| 360 Food Partners Limited | Professional & scientific | 2017 |
| 360 HR Consultancy Ltd | Administrative & support | 2022 |
| 360 Kare Ltd | Administrative & support | 2018 |
| 360 Wellness Ltd | Health & social care | 2024 |
| 368 Cottage Limited | Hospitality | 2025 |
| 369Q Limited | Information & communication | 2026 |
| 378-380 Kettering Road Residents Limited | Administrative & support | 2008 |
| 381 Food Limited | Hospitality | 2017 |
| 385 North Limited | Transport & logistics | 2003 |
| 39-41 Boutport Street Limited | Extraterritorial | 2023 |
| 3A&V Construction Ltd | Manufacturing | 2025 |
| 3ANDB Limited | Construction | 2016 |
| 3B Business Branding Ltd | Information & communication | 2026 |
| 3D Human Solutions Ltd | Health & social care | 2025 |
| 3D INK Limited | Administrative & support | 2002 |
| 3D Sons Limited | Transport & logistics | 2025 |
| 3DI Consulting Limited | Professional & scientific | 2004 |
| 3JES Properties Ltd | Real estate | 2021 |
| 3KP Limited | Information & communication | 2020 |
| 3PLE OSA Property Group Ltd | Real estate | 2025 |
| 3PUL4 UK Ltd | Extraterritorial | 2022 |
| 3RD Rail Limited | Manufacturing | 2013 |
| 3RIPLE N Limited | Financial services | 2013 |
| 3S Northampton (Holdings) Limited | Financial services | 2022 |
| 3S Northampton Limited | Construction | 2015 |
| 3SIXTY Outsourcing Limited | Professional & scientific | 2021 |
| 3SIXTY Talent Management Ltd | Administrative & support | 2018 |
| 3SIXTYWRAPS Ltd | Manufacturing | 2014 |
| 3TI Energy Hubs Ltd | Construction | 2019 |
| 3XL Aviation Limited | Administrative & support | 2014 |
| 4 Cogs Development Management Limited | Construction | 2022 |
| 4 in 1 Express Takeaway Ltd | Hospitality | 2018 |
| 4 Mauldeth Road West RTM Company Ltd | Households | 2023 |
| 4 Point Projects Ltd | Construction | 2025 |
| 4 Sales Growth Ltd | Professional & scientific | 2016 |
| 4 Seasons Cafe Ltd | Hospitality | 2021 |
| 4 the Drive Management Limited | Households | 2016 |
| 41 East Park Parade Limited | Households | 1986 |
| 41 Semilong Road Limited | Real estate | 1999 |
| 43SST Limited | Households | 2024 |
| 44 Knox Road Freehold Limited | Real estate | 2022 |
| 48 East Park Parade Management Limited | Households | 2010 |
| 48.3 Scaffold Design (Leeds) Limited | Construction | 2009 |
| 48.3 Scaffold Design Limited | Professional & scientific | 2011 |
| 49 Miles More Ltd | Information & communication | 2026 |
| 49-51 Kildare Road (Freehold) Limited | Real estate | 2019 |
| 4D Baby and Fertility Scans Ltd | Health & social care | 2026 |
| 4D Studio Limited | Professional & scientific | 1998 |
| 4KO Ltd | Transport & logistics | 2014 |
| 4M Business Limited | Construction | 2016 |