| 4NINE Trading Limited | Manufacturing | 2016 |
| 4ORTY Forty Ltd | Wholesale & retail | 2024 |
| 4RTUNE Solutions Limited | Wholesale & retail | 2024 |
| 4SECURE Limited | Information & communication | 2003 |
| 4TH Dimension Technology Limited | Information & communication | 2018 |
| 4X4 Limited | Wholesale & retail | 2022 |
| 5 Akhis Northampton Ltd | Hospitality | 2024 |
| 5 Star Loos Ltd | Administrative & support | 2015 |
| 50 Charles Limited | Wholesale & retail | 2022 |
| 50 Hackford Road Management Company Limited | Households | 1996 |
| 50 Minutes for YOU Ltd | Health & social care | 2025 |
| 505 Games Ltd | Information & communication | 2005 |
| 51 Broadmead Avenue Ltd | Health & social care | 2025 |
| 51R Ltd | Health & social care | 2018 |
| 52EFM Ltd | Real estate | 2022 |
| 53 Havelock Street RTM Company Limited | Real estate | 2016 |
| 54 Cyril Street Management Limited | Households | 2025 |
| 54 London Limited | Arts & recreation | 2016 |
| 54 STG Freehold Limited | Households | 2018 |
| 54 STG LLP | | 2015 |
| 56 Sheep Street Limited | Real estate | 2021 |
| 569 Property Ltd | Real estate | 2023 |
| 57MG Limited | Professional & scientific | 2017 |
| 58/60 Avarn Road Management Company Ltd | Households | 2017 |
| 5T IDM Limited | Professional & scientific | 2022 |
| 5T Property Limited | Real estate | 2026 |
| 5Z Limited | Hospitality | 2025 |
| 6 Cheyne Walk Limited | Construction | 2022 |
| 60 Miles by Road OR Rail Ltd | Arts & recreation | 2019 |
| 61 Billing Road Management Company Limited | Households | 2019 |
| 66UBS Services Ltd | Professional & scientific | 2018 |
| 69 Global Ltd | Administrative & support | 2025 |
| 69 the Avenue Northampton (Freehold) Ltd | Extraterritorial | 2014 |
| 6AM Property Limited | Households | 2026 |
| 7 Districts Flooring Ltd. | Construction | 2023 |
| 7 Knots Ltd | Wholesale & retail | 2024 |
| 7 Oak Catering Ltd | Hospitality | 2019 |
| 7 Star Minimarket Ltd | Wholesale & retail | 2024 |
| 7 Star Unisex Salon and Cosmetics Products Limited | Other services | 2025 |
| 7 TM Ltd | Other services | 2024 |
| 71GHS Limited | Financial services | 2024 |
| 74 Manorfield Close (Rentals) Ltd | Real estate | 2026 |
| 74SDN Limited | Construction | 2024 |
| 75 the Avenue Limited | Real estate | 2021 |
| 76 Fairhazel Gardens Limited | Real estate | 2024 |
| 765 Investments Ltd | Real estate | 2023 |
| 77 Real Estate Limited | Real estate | 2021 |
| 78 Amundsen Management Ltd | Real estate | 2014 |
| 78-88 Finney Drive RTM Company Limited | Households | 2024 |
| 79DE Holdings Ltd | Real estate | 2023 |
| 79DE Ltd | Administrative & support | 2016 |
| 7C'S Consulting Engineers Limited | Professional & scientific | 2011 |
| 7RUDDER Consulting Limited | Wholesale & retail | 2016 |
| 7W7 Limited | Administrative & support | 2016 |
| 8 Barrels Club Ltd | Wholesale & retail | 2018 |
| 8 Watkin Terrace Northampton Limited | Real estate | 1994 |
| 82 Portland Place (Flat a) Limited | Real estate | 2025 |
| 888 Solutions Ltd | Professional & scientific | 2019 |
| 92-98 Woodpecker Way RTM Company Limited | Households | 2024 |
| 92AS Limited | Real estate | 2026 |
| 93 Sterndale Road Management Limited | Households | 1981 |
| 94-96 Midland Road Ltd. | Real estate | 2006 |
| 990 Solutions Limited | Information & communication | 2021 |
| 999 Plumbing Heating and Drainage Ltd | Construction | 2021 |
| 999PLUS Ltd | Extraterritorial | 2020 |
| 99PLUZ Ltd | Information & communication | 2026 |
| 99T Specialist Services Limited | Wholesale & retail | 2018 |
| 9DRW Ltd | Information & communication | 2014 |
| 9M Construction Limited | Construction | 2012 |
| 9SECONDS Ltd | Information & communication | 2023 |
| @Cute Consultancy Ltd | Professional & scientific | 2022 |
| A & a Crack & Sons Limited | Wholesale & retail | 2013 |
| A & a Duncan Properties Ltd | Real estate | 2020 |
| A & a Healthcare Ltd | Health & social care | 2018 |
| A & a Landscapes Limited | Administrative & support | 2003 |
| A & a Project 2025 Ltd | Professional & scientific | 2024 |
| A & C Aerials Limited | Administrative & support | 2004 |
| A & C Logistics Limited | Transport & logistics | 2015 |
| A & C Property (Kettering) Ltd | Real estate | 2013 |
| A & C Thompson Limited | Information & communication | 2024 |
| A & D Joinery Limited | Manufacturing | 1993 |
| A & D Mini Market Ltd | Wholesale & retail | 2007 |
| A & D Roofing and Clading Ltd | Construction | 2020 |
| A & ES Britain Ltd | Construction | 2021 |
| A & F Crash Repairs Limited | Wholesale & retail | 2014 |
| A & F Foster Holdings Limited | Financial services | 2022 |
| A & F IT Consultancy Limited | Information & communication | 2016 |
| A & G (Family Butchers) Limited | Real estate | 1974 |
| A & H Meats Limited | Wholesale & retail | 2016 |
| A & I Fraser Limited | Agriculture & fishing | 1973 |
| A & I Trans Ltd | Transport & logistics | 2019 |
| A & K Enterprise and Services Ltd | Administrative & support | 2025 |
| A & L Mason Holdings Limited | Financial services | 2026 |
| A & L Paving Limited | Construction | 2005 |
| A & M Contract Services Limited | Construction | 1999 |
| A & M Leisure Ltd | Extraterritorial | 2009 |
| A & N Fireplace Services Limited | Construction | 2007 |
| A & N Skips Limited | Water & waste | 2013 |
| A & S Karavadra Limited | Wholesale & retail | 2007 |
| A & S Transport Solutions Ltd | Professional & scientific | 2017 |