| A & T Holdings Limited | Professional & scientific | 2017 |
| A & V Norfolk Ltd | Construction | 2025 |
| A &L Paving 2009 Limited | Construction | 2009 |
| A 2 Z Personalised Care Limited | Health & social care | 2019 |
| A a PAT Testing Limited | Public administration | 2014 |
| A Advanta Limited | Professional & scientific | 2024 |
| A and a Indoor Cycles Limited | Wholesale & retail | 2017 |
| A Batty Enterprises Ltd | Education | 2007 |
| A BEE Contracts Limited | Construction | 2025 |
| A C Financial Ltd | Financial services | 1999 |
| A C Lofts Limited | Construction | 2014 |
| A Call for Love Ltd | Information & communication | 2022 |
| A Catlow Civil Engineering Limited | Construction | 2001 |
| A Chereches Ltd | Construction | 2016 |
| A Creative Haus Ltd | Professional & scientific | 2025 |
| A Cross Production Ltd | Information & communication | 2016 |
| A CUT Above Landscape & Treecare Limited | Administrative & support | 2017 |
| A D Ceramics Ltd. | Administrative & support | 2016 |
| A D Engineering Design Ltd | Professional & scientific | 2008 |
| A D Hodson Transport Services Limited | Transport & logistics | 2012 |
| A Duffield Motorsports Ltd | Transport & logistics | 2025 |
| A Duggan Build & Development Limited | Construction | 2019 |
| A E Hire Ltd | Administrative & support | 2022 |
| A E Wilson (Commercials) Ltd | Transport & logistics | 1986 |
| A Eureka Moment Limited | Professional & scientific | 2019 |
| A FEW of My Favourite Gifts Ltd | Wholesale & retail | 2024 |
| A G H Tyres Limited | Wholesale & retail | 2010 |
| A G I Plus Ltd | Professional & scientific | 2019 |
| A Good Old Yarn CIC | Manufacturing | 2026 |
| A GOP Limited | Transport & logistics | 2021 |
| A Grade Building Solutions Ltd | Construction | 2020 |
| A Grade Drainage Limited | Administrative & support | 2020 |
| A H Paving Ltd | Construction | 2018 |
| A Handful of Reasons Limited | Other services | 2023 |
| A Harley Ltd | Manufacturing | 2015 |
| A I Roberts Carpentry Ltd | Construction | 2016 |
| A J Bentley Limited | Real estate | 1955 |
| A J Cooke & SON Ltd | Construction | 2007 |
| A J Fabrications (Northampton) Limited | Manufacturing | 2005 |
| A J Mackaness Group Limited | Professional & scientific | 2012 |
| A J Mackaness Holdings Limited | Professional & scientific | 2005 |
| A J Mcnair Carpentry Services Ltd | Construction | 2005 |
| A J Super Store Ltd | Wholesale & retail | 2018 |
| A K Biomedical & Healthcare Limited | Wholesale & retail | 2025 |
| A K Land & Property Investment Limited | Real estate | 2022 |
| A K P Tax Advisory Services Limited | Professional & scientific | 2010 |
| A L F Plant Ltd | Administrative & support | 2012 |
| A Little Extra Help Limited | Health & social care | 2016 |
| A Load of BS Ltd | Information & communication | 2024 |
| A M J Driving School Ltd | Education | 2025 |
| A M Kitchens & Carpentry Limited | Construction | 2014 |
| A M Samy Limited | Health & social care | 2007 |
| A M Training Solutions Limited | Education | 2026 |
| A M Water Services Limited | Construction | 2016 |
| A MAN WHO CAN - Northampton Ltd | Water & waste | 2023 |
| A Marks Electrical Limited | Construction | 2021 |
| A Mcgregor Private Clients Limited | Health & social care | 2014 |
| A P Customs Ltd | Wholesale & retail | 2019 |
| A P M Construction Limited | Construction | 2015 |
| A P Pressure Wash Ltd | Administrative & support | 2020 |
| A Prendi Construction Ltd | Construction | 2020 |
| A R Roofing Services Limited | Construction | 2016 |
| A Razmus Transport Ltd | Wholesale & retail | 2024 |
| A RUS Electrical Ltd | Construction | 2024 |
| A S Harrington Electrical & Property Services Ltd | Construction | 2016 |
| A Skilled Hines Limited | Information & communication | 2013 |
| A Sturgess Decorators Limited | Construction | 2014 |
| A T (Northampton) Limited | Construction | 2025 |
| A T Jones Building Services Ltd | Construction | 2023 |
| A Team Cleaning Group Ltd | Administrative & support | 2025 |
| A Thakur Limited | Professional & scientific | 2012 |
| A Tysoe Electrical Services Limited | Construction | 2016 |
| A Very Special Journey Limited | Other services | 2018 |
| A Void Collective CIC | Arts & recreation | 2026 |
| A W Music Limited | Professional & scientific | 2021 |
| A Weissenburger Ltd | Construction | 2023 |
| A Yummy Pizza Ltd | Hospitality | 2017 |
| A Z Spray & DEC Ltd | Construction | 2025 |
| A&A Care Services Ltd | Health & social care | 2024 |
| A&A Central Limited | Hospitality | 2021 |
| A&A Investment Properties Ltd | Real estate | 2025 |
| A&A Premier Interiors Ltd | Construction | 2026 |
| A&A Properties Investment Ltd | Hospitality | 2026 |
| A&B Construction and Development GB Ltd | Construction | 2014 |
| A&B Same Day Removal and Storage Ltd | Transport & logistics | 2016 |
| A&C Art and Beauty Salon Ltd | Other services | 2023 |
| A&C Building Services Ltd | Construction | 2019 |
| A&C Communications Ltd | Construction | 2018 |
| A&C Couriers Ltd | Transport & logistics | 2016 |
| A&C Transport Group Ltd | Transport & logistics | 2025 |
| A&E ADT Properties Limited | Real estate | 2024 |
| A&E Construction Ltd | Construction | 2020 |
| A&E Couriers Limited | Transport & logistics | 2016 |
| A&E Medical Limited | Extraterritorial | 2007 |
| A&F Psychological Services Ltd | Other services | 2022 |
| A&G Cleaning Ltd | Administrative & support | 2017 |
| A&G Driver Ltd | Transport & logistics | 2024 |
| A&G Nikolli Ltd | Real estate | 2022 |
| A&G Projects Ltd | Hospitality | 2021 |
| A&H Cargo Ltd | Transport & logistics | 2026 |