| 1st Class Installations Ltd | Joiners & carpenters | NN6 0RQ | 2022 |
| 1st Clever Choice Ltd | Garages & mechanics | NN2 6EE | 2016 |
| 3active Ltd | Plumbing & heating | NN2 7AZ | 2002 |
| 4 Point Projects Ltd | Builders | NN2 7FE | 2025 |
| 7 Districts Flooring Ltd. | Flooring & tiling | NN2 6NP | 2023 |
| A & F Crash Repairs Ltd | Garages & mechanics | NN2 7AZ | 2014 |
| A & G Conservatories Ltd | Plasterers | NN6 8RW | 2001 |
| A & V Norfolk Ltd | Builders | NN2 7AZ | 2025 |
| A Chereches Ltd | Builders | NN2 7DU | 2016 |
| A Grade Building Solutions Ltd | Builders | NN6 7RR | 2020 |
| A Grade Drainage Ltd | Cleaners | NN6 7RR | 2020 |
| A Handful of Reasons Ltd | Hair & beauty | NN2 7JF | 2023 |
| A J Cooke & Son Ltd | Builders | NN2 7AZ | 2007 |
| A J Mcnair Carpentry Services Ltd | Builders | NN6 0LP | 2005 |
| A Razmus Transport Ltd | Garages & mechanics | NN2 6AA | 2024 |
| A&W Contractors Ltd | Builders | NN2 7DQ | 2023 |
| A-Star Flooring Services Ltd | Flooring & tiling | NN6 0PZ | 2024 |
| A-Star Gardening & Landscaping Ltd | Gardeners & landscapers | NN2 7AZ | 2024 |
| A.B.Y. Artisans Ltd | Builders | NN2 7SS | 2026 |
| A.Bell & Co,Ltd | Builders | NN2 6LT | 1905 |
| A.J. Jones Tipper & Grab Hire Ltd | Builders | NN2 7AZ | 2003 |
| A.J.R. Electrical Services (Banbury) Ltd | Electricians | NN2 7AZ | 2007 |
| A1 Mot Centre Northampton Ltd | Garages & mechanics | NN2 6EE | 2019 |
| Aaj Building Ltd | Builders | NN2 7FU | 2024 |
| Abbotts Langley Properties Ltd | Builders | NN2 6RP | 2017 |
| Abi Plumbing and Bathrooms Ltd | Plumbing & heating | NN2 6JY | 2022 |
| Aca Interiors Ltd | Builders | NN2 7DU | 2019 |
| Acp Formwork Ltd | Builders | NN2 6RQ | 2020 |
| Acre Contracting Ltd | Electricians | NN6 7GA | 2006 |
| Acts 9 Developments Ltd | Builders | NN6 0BN | 2021 |
| Ada Autocare Ltd | Garages & mechanics | NN2 6LJ | 2024 |
| Adam Wells Flooring Ltd | Flooring & tiling | NN2 7AZ | 2022 |
| Address Barber Ltd | Hair & beauty | NN2 7SL | 2024 |
| Aeroclean Energy Ltd | Cleaners | NN2 7QA | 2026 |
| Agrilec Ltd | Electricians | NN6 7TF | 2013 |
| Ahmed Construction (Northampton) Ltd | Builders | NN2 7ET | 2018 |
| Aitken Electrical Contractors Ltd | Electricians | NN2 7AZ | 2014 |
| Albert Watts Hairdressers Ltd | Hair & beauty | NN2 7AZ | 2008 |
| Alconstruction Brickwork Ltd | Builders | NN6 0TF | 2026 |
| Alderman Roofing Ltd | Roofers | NN6 7PF | 2003 |
| Alliance Lofts Ltd | Builders | NN6 9LB | 2025 |
| Allied Landscapes Ltd | Gardeners & landscapers | NN6 0BG | 2002 |
| Allin Paint Ltd | Garages & mechanics | NN2 6NE | 2024 |
| Allseasons Property Services Ltd | Builders | NN2 6LJ | 2022 |
| Almey Roofing Services Ltd | Builders | NN6 0LJ | 2022 |
| Alpha Pro Cleaners Ltd | Cleaners | NN2 6HR | 2023 |
| Aluma Electrical Contractors Ltd | Electricians | NN2 7QJ | 2026 |
| Amc Electrical (Northants) Ltd | Electricians | NN6 9EE | 2018 |
| Amend-A-Home UK Ltd | Builders | NN2 7AZ | 2024 |
| Andi Construction Ltd | Builders | NN2 7TN | 2025 |
| Andrew A Woodfield Ltd | Plumbing & heating | NN6 0BG | 2016 |
| Andrew Smedley Ltd | Plumbing & heating | NN6 7TX | 2014 |
| Andy Bass Electrical Ltd | Electricians | NN6 9DD | 2018 |
| Andy Essam Carpentry Ltd | Builders | NN2 7AZ | 2016 |
| Ang Motors Garage Ltd | Garages & mechanics | NN2 8BA | 2018 |
| Angell Plumbing Services Ltd | Plumbing & heating | NN6 8HS | 2014 |
| Aperture Cleaning Services Ltd | Cleaners | NN6 7GF | 2019 |
| Aperture Commercial Cleaning Services Ltd | Cleaners | NN6 7GF | 2019 |
| Aperture Contract Services Group Ltd | Cleaners | NN6 7GF | 2019 |
| Aperture Window Cleaning (Suburban) Ltd | Cleaners | NN6 7GF | 2025 |
| Aperture Window Cleaning (Urban) Ltd | Cleaners | NN6 7GF | 2025 |
| Apex Block Cutters Ltd | Flooring & tiling | NN2 7AZ | 1995 |
| Aquagrace Ltd | Gardeners & landscapers | NN2 6HW | 2023 |
| Arcbase Ltd | Plumbing & heating | NN6 7QP | 2024 |
| Ark Plumbing & Heating Ltd | Plumbing & heating | NN2 7AZ | 2014 |
| Art Construct 88 Ltd | Builders | NN2 8TX | 2025 |
| As Design & Builders Ltd | Builders | NN2 8NR | 2026 |
| As15 Ltd | Garages & mechanics | NN2 6EE | 2025 |
| Ashton Plastering Contractors Ltd | Builders | NN2 7AZ | 2019 |
| Ashway Civil Engineering Ltd | Builders | NN6 7RR | 2024 |
| Ashway Electrical Ltd | Electricians | NN6 9HZ | 2024 |
| Ask4driver Ltd | Builders | NN2 7FF | 2022 |
| Asm Beauty Ltd | Hair & beauty | NN2 8QA | 2024 |
| Aspect Glazing Ltd | Glaziers | NN2 6LJ | 2012 |
| Atkinson Commercial & Domestic Services Ltd | Painters & decorators | NN2 8QS | 2026 |
| Aura Commercial Cleaning Services Ltd | Cleaners | NN2 6EZ | 2014 |
| Auto Centre Northampton Ltd | Garages & mechanics | NN2 6LJ | 2016 |
| Auto Detailing Studio Ltd | Garages & mechanics | NN6 0TF | 2025 |
| Auto Refinement Ltd | Garages & mechanics | NN6 7UY | 2024 |
| Automotive Engineering (Northants) Ltd | Garages & mechanics | NN2 6EE | 2016 |
| Autoplus Northampton Ltd | Garages & mechanics | NN2 6EE | 2012 |
| Autosphere Ltd | Garages & mechanics | NN2 6EE | 2022 |
| Autosprays 15 Ltd | Garages & mechanics | NN2 6EE | 2025 |
| Azure Plumbing & Heating Ltd | Plumbing & heating | NN2 8PE | 2005 |
| Bailey & Jones Hair Ltd | Hair & beauty | NN2 7SL | 2017 |
| Bailey'S & Co. Company Ltd | Hair & beauty | NN2 8ET | 2022 |
| Barkli Ltd | Builders | NN2 6JG | 2022 |
| Barnes Brick Cutting Services Ltd | Builders | NN2 7AZ | 2024 |
| Barton Roofing Ltd | Roofers | NN2 7AZ | 2026 |
| Barwell Body Repairs Ltd | Garages & mechanics | NN2 6NE | 2019 |
| Bawn Construction Ltd | Builders | NN2 6LS | 2016 |
| Bay Tree Fencing Ltd | Builders | NN6 8FE | 2020 |
| Bazan Investment Ltd | Builders | NN2 6NS | 2026 |
| Beautique Aesthetics Ltd | Hair & beauty | NN2 7HJ | 2019 |
| Bee Safe Fire Services Ltd | Cleaners | NN2 7AZ | 2010 |
| Beebond Ltd | Builders | NN2 8ET | 2020 |
| Belgrade Consultants Ltd | Builders | NN6 7AW | 2015 |
| Bentley Displays Ltd | Builders | NN6 0JF | 2026 |
| Bergari Group Ltd | Builders | NN2 6NE | 2024 |
| Bergari Ltd | Builders | NN2 6NE | 2018 |
| Berrywood Timber Installations Ltd | Joiners & carpenters | NN6 0HU | 2025 |
| Bertie Blue Ltd | Painters & decorators | NN2 6QA | 2017 |
| Besjan Construction Ltd | Builders | NN2 6EW | 2026 |
| Bespoke Grains Ltd | Joiners & carpenters | NN6 6JG | 2024 |
| Bh K Sutton Ltd | Builders | NN6 8FB | 2014 |
| Blockwell Paving Ltd | Builders | NN2 6PD | 2021 |
| Bloom Beauty Rby Ltd | Hair & beauty | NN2 6BG | 2026 |
| Boffo Ltd | Builders | NN2 7QX | 2017 |
| Bond Hair Ltd | Hair & beauty | NN6 0BN | 2011 |
| Bott the Builder (Lb) Ltd | Builders | NN6 0BG | 2006 |
| Boughton Tree and Landscapes Ltd | Gardeners & landscapers | NN2 7AZ | 2026 |
| Brampton Electrical Services Ltd | Electricians | NN6 9WP | 2010 |
| Brave Brickwork Ltd | Builders | NN2 8SY | 2022 |
| Brickplans Construction Ltd | Builders | NN2 6BF | 2026 |
| Briggs & Forrester Energy Ltd | Plumbing & heating | NN2 6LZ | 2011 |
| Briggs & Forrester Engineering Ltd | Builders | NN2 6LZ | 2012 |
| Briggs & Forrester Engineering Services Ltd | Electricians | NN2 6LZ | 1973 |
| Briggs & Forrester Living Ltd | Electricians | NN2 6LZ | 1984 |
| Briggs & Forrester Special Projects Ltd | Electricians | NN2 6LZ | 1990 |
| Bright Sparks Lighting Ltd | Electricians | NN6 0BN | 2010 |
| Britcari Construction Ltd | Builders | NN2 8FF | 2026 |
| Briton Building & Services Ltd | Builders | NN6 9UB | 1992 |
| Buckby Plant & Construction Ltd | Builders | NN6 7PP | 2023 |
| Build Pluss UK Ltd | Builders | NN2 8QE | 2024 |
| Building Deluxe Ltd | Builders | NN2 8EZ | 2016 |
| Bulldog and Bear Barbershop Ltd | Hair & beauty | NN6 9BU | 2018 |
| Bulldog and Bear Hair Replacement Ltd | Hair & beauty | NN6 9BU | 2020 |
| Burghfam Ltd | Builders | NN2 7RR | 2017 |
| Butterworth Heating Ltd | Plumbing & heating | NN2 7LH | 2009 |
| Bvs Rescue Services Ltd | Garages & mechanics | NN6 0BG | 2008 |
| Bw3 Electrical Ltd | Electricians | NN2 8PF | 2024 |
| Byron & Partners Ltd | Plumbing & heating | NN2 7JE | 2023 |
| C & S Eyre Consulting Ltd | Builders | NN6 7TT | 2025 |
| C A Mclellan Ltd | Electricians | NN2 6NN | 2009 |
| C D Blinds Ltd | Builders | NN2 8RG | 2015 |
| C J Ground Works & Civil Engineering Ltd | Builders | NN2 7QX | 2003 |
| C&A Construction Services Ltd. | Builders | NN2 8AJ | 2017 |
| C&D Plastering Contractors Ltd | Plasterers | NN2 7AZ | 2022 |
| C&O Start-Up Ltd | Electricians | NN2 7AY | 2021 |
| C.R. Garden Maintenance and Clearance Ltd | Gardeners & landscapers | NN2 7TJ | 2026 |
| Carpettt. Ltd | Painters & decorators | NN2 7EE | 2024 |
| Carrino Flooring Ltd | Flooring & tiling | NN2 7AZ | 1994 |
| Carter Sbm Ltd | Builders | NN2 7AZ | 2008 |
| Catalyst Heating and Cooling Services Ltd | Plumbing & heating | NN2 7AZ | 2019 |
| Cavaedium Ltd | Builders | NN2 7JF | 2024 |
| Cavalry Cleaning Ltd | Cleaners | NN6 9DU | 2015 |
| Cb Recovery Ltd | Garages & mechanics | NN2 7HN | 2023 |
| Cba Construction Ltd | Builders | NN2 8TR | 2025 |
| Ch Broadnook P1 Ltd | Builders | NN6 8DT | 2024 |
| Ch St Ives Ltd | Builders | NN6 8DT | 2024 |