| Moulton Beauty Barn Ltd | Other services | 2023 |
| Moulton Developments Northampton Limited | Construction | 2016 |
| Moulton Domestic Services Limited | Administrative & support | 2010 |
| Moulton Grange Limited | Real estate | 2020 |
| Moulton Homes Ltd | Construction | 2019 |
| Moulton Investments Ltd | Administrative & support | 2015 |
| Moulton Kitchens & Interiors Ltd. | Construction | 2023 |
| Moulton Kitchens Ltd. | Construction | 2016 |
| Moulton Main Garage Automotive Ltd | Wholesale & retail | 2026 |
| Moulton Main Garage Ltd | Wholesale & retail | 2022 |
| Moulton Minibus Service Limited | Transport & logistics | 2023 |
| Moulton Park Management Company Limited | Other services | 1987 |
| Moulton Park Office Village (Northampton) Limited | Administrative & support | 1988 |
| Moulton Plumbing and Heating Ltd | Construction | 2026 |
| Moulton School and Science College | Education | 2011 |
| Moulton Solar Ltd | Construction | 2022 |
| Moulton Village Festival CIC | Arts & recreation | 2023 |
| Mount Moriah Organisation CIC | Health & social care | 2020 |
| Mountlogic AV Limited | Professional & scientific | 2011 |
| Mountview Private Limited | Health & social care | 2014 |
| Mountview SA Ltd | Hospitality | 2020 |
| Mountvision Ltd | Wholesale & retail | 2021 |
| Move Modestly Ltd | Wholesale & retail | 2025 |
| Move Productions Ltd | Information & communication | 2000 |
| Move Prop Estate Agents Limited | Real estate | 2009 |
| MOVE4 Physiotherapy Ltd | Other services | 2016 |
| Movement Clinic Northampton Ltd | Health & social care | 2021 |
| Movement Medicine Ltd | Information & communication | 2024 |
| Moventis Group Limited | Transport & logistics | 2025 |
| Movesnap Limited | Real estate | 1999 |
| Moving on UP (Northampton) Ltd. | Health & social care | 2009 |
| Movingtobarcelona.Com Limited | Extraterritorial | 2016 |
| Movxpress Ltd | Transport & logistics | 2025 |
| Moware Limited | Information & communication | 2006 |
| Mowen Ltd | Transport & logistics | 2025 |
| Mower's ARK CIC | Education | 2019 |
| Moyeb Company Limited | Health & social care | 2014 |
| Moynasprops Ltd | Real estate | 2025 |
| MP (Central Administration) LLP | | 2006 |
| MP Construction Services Ltd | Construction | 2024 |
| MP Consulting Business Services Ltd | Administrative & support | 2021 |
| MP Developments Northants Limited | Real estate | 2014 |
| MP Drywall Limited | Construction | 2002 |
| MP Firewall Limited | Construction | 2019 |
| MP Gold Properties Ltd | Real estate | 2016 |
| MP Health Projects Limited | Professional & scientific | 2012 |
| MP Investments & Properties Ltd | Real estate | 2021 |
| MP Platinum Investment Holding Ltd | Financial services | 2025 |
| MP Tax Planning Limited | Professional & scientific | 2010 |
| Mpacs (Northampton) Limited | Professional & scientific | 2010 |
| Mpacs Properties Limited | Real estate | 2017 |
| MPB Tiling Ltd | Construction | 2021 |
| MPD Living Limited | Real estate | 2025 |
| MPG Autos Limited | Manufacturing | 2012 |
| MPH Hotel Limited | Hospitality | 2017 |
| MPI Group Limited | Financial services | 2021 |
| Mpira Ltd | Wholesale & retail | 2020 |
| Mpm&Family Limited | Construction | 2017 |
| Mprisk Ltd | Professional & scientific | 2019 |
| MPS Painting Contractors Limited | Construction | 2005 |
| MPS Trucks Ltd | Transport & logistics | 2026 |
| MPW Hospitality Limited | Professional & scientific | 2025 |
| MPW Plumbing & Heating Limited | Construction | 2016 |
| Mqlegal Limited | Professional & scientific | 2014 |
| MR Barber Box Limited | Other services | 2024 |
| MR Chippy 58 Ltd | Hospitality | 2022 |
| MR Clickk Limited | Wholesale & retail | 2025 |
| MR D Logistics (Northants) Limited | Transport & logistics | 2015 |
| MR Gadget Repair Limited | Wholesale & retail | 2026 |
| MR LIU Kitchen Ltd | Hospitality | 2022 |
| MR8 Ltd | Transport & logistics | 2025 |
| MRD Installations Ltd | Construction | 2015 |
| MRE 3D Ltd | Professional & scientific | 2023 |
| MRE Utilities Group Limited | Construction | 2025 |
| MRE Utilities Limited | Construction | 2022 |
| MRG Construction Ltd | Construction | 2025 |
| MRJ Consulting Services Ltd | Professional & scientific | 2003 |
| MRK Transport Ltd | Transport & logistics | 2015 |
| MRM Consultancy Limited | Professional & scientific | 2005 |
| MRP Property Services Limited | Construction | 2003 |
| MRT Project Solutions Ltd | Construction | 2014 |
| MRV Transport Ltd | Transport & logistics | 2025 |
| MS @ NN1 Conference Rooms Ltd | Arts & recreation | 2023 |
| MS Car & Van Repair Specialists Limited | Real estate | 2025 |
| MS Health and Cosmetics Limited | Other services | 2019 |
| MS Kube Limited | Manufacturing | 2013 |
| MS Moto Ltd | Transport & logistics | 2013 |
| MS Pro Flooring Ltd | Construction | 2026 |
| MS Rail Consultants Ltd | Professional & scientific | 2020 |
| MS Sols Holdings Limited | Construction | 2016 |
| MS Trans Inc Ltd | Transport & logistics | 2016 |
| MS Van&Car Solution Ltd | Wholesale & retail | 2025 |
| MSA Properties Limited | Construction | 2014 |
| MSA Residential Properties Ltd | Construction | 2025 |
| MSA Topco Limited | Real estate | 2026 |
| Msas Activities Limited | Arts & recreation | 2026 |
| MSC Aviation Limited | Professional & scientific | 2015 |
| MSC Healthcare Solutions Ltd | Health & social care | 2023 |
| MSD Food Services Ltd | Hospitality | 2018 |
| MSG Composites Limited | Manufacturing | 2026 |