| MP Automotive Ltd | Wholesale & retail | 2015 |
| MRA Pest Control Ltd | Professional & scientific | 2020 |
| Mrk's Prestige Motors Ltd | Wholesale & retail | 2026 |
| MRW Brickwork Ltd | Construction | 2017 |
| MS Roofing Contractors Ltd | Construction | 2017 |
| MSL Cable Contractors Limited | Construction | 2012 |
| Msnnv Ltd | Wholesale & retail | 2024 |
| MTI Midlands Ltd | Construction | 2026 |
| MTS Ilkeston Midlands Limited | Financial services | 2025 |
| Muddy Paws Crew Ltd | Other services | 2023 |
| Musclepanda Fitness Ltd | Education | 2020 |
| Music and Lights Entertainment Ltd | Arts & recreation | 2023 |
| Musical & Electrical Supplies (Ilkeston) Limited | Manufacturing | 1964 |
| Muskett Joinery Ltd | Construction | 2025 |
| MV Animal Physiotherapy Ltd | Other services | 2023 |
| MW Management Solutions Ltd | Construction | 2014 |
| Mwda Property Management Ltd | Real estate | 2025 |
| MX Hive Limited | Wholesale & retail | 2025 |
| MXM Auto Repairs Ltd | Wholesale & retail | 2026 |
| My Pet Pawtraits Ltd | Arts & recreation | 2021 |
| My Place Group Services Limited | Extraterritorial | 2024 |
| My Place Lets Limited | Wholesale & retail | 2008 |
| Mydean Properties Limited | Construction | 1989 |
| Mysunshinedrc Ltd | Other services | 2023 |
| Mythco Ltd | Professional & scientific | 2024 |
| N S Agriculture Limited | Agriculture & fishing | 2021 |
| N&B Surfacing Limited | Construction | 2025 |
| NAC Hire Limited | Construction | 2018 |
| Nafy International Ltd | Wholesale & retail | 2026 |
| Nagwal Holdings Limited | Financial services | 2018 |
| Nails Bar 88 Ltd | Other services | 2026 |
| Nana Foods INT Limited | Hospitality | 2024 |
| Narvi Group Ltd | Transport & logistics | 2026 |
| National Airport Transfer Ltd | Transport & logistics | 2024 |
| Navdeep Limited | Real estate | 1990 |
| Nb&S Power Ltd | Professional & scientific | 2025 |
| NDB Window Blinds Limited | Construction | 2019 |
| NDL Electrical Installations Ltd | Construction | 2017 |
| NDL Investments Ltd | Real estate | 2017 |
| Needham's Croft Ltd | Households | 2019 |
| Nelson's Ride's and Attraction's Ltd | Arts & recreation | 2023 |
| NEP Inspections Limited | Professional & scientific | 2017 |
| Nepal Dine Ilkiston Ltd | Hospitality | 2025 |
| Nestcare Limited | Hospitality | 2009 |
| Nestrock Limited | Arts & recreation | 2023 |
| NETBALL4U Limited | Arts & recreation | 2026 |
| Netlink Technical Limited | Information & communication | 1999 |
| Netsmark Limited | Real estate | 2016 |
| Netsmark Residential Limited | Real estate | 2019 |
| New Magic WOK Ltd | Hospitality | 2025 |
| New Marble 168 Ltd | Hospitality | 2021 |
| New Vision Double Glazing Ltd | Construction | 2026 |
| Newbold Hearing Care Limited | Wholesale & retail | 2012 |
| Newbutt and Robertson Limited | Construction | 2005 |
| Newlook by Natasha Limited | Professional & scientific | 2025 |
| Newrise Construction PVT Ltd | Construction | 2022 |
| Newvision Happy Ltd | Wholesale & retail | 2022 |
| Nexsis Comms Limited | Information & communication | 2009 |
| Nexsis Property Services Limited | Real estate | 2020 |
| Next Level Leisure Limited | Arts & recreation | 2025 |
| Next Life Workforce Limited | Construction | 2026 |
| NG10 Property Ltd | Real estate | 2020 |
| NG11 Housing Ltd | Real estate | 2025 |
| Nibby PIT MCS Limited | Wholesale & retail | 2017 |
| NIC Jones Agility Ltd | Administrative & support | 2017 |
| Nice Construction & Developments Ltd | Households | 2018 |
| Nice Human Consultancy Ltd | Professional & scientific | 2024 |
| Nicola Hinitt Personal Estate Agent Limited | Real estate | 2025 |
| Nicoobu Ltd | Arts & recreation | 2025 |
| NIJ Locum Limited | Health & social care | 2014 |
| Nimova Limited | Wholesale & retail | 2024 |
| Ninety Works Ltd | Professional & scientific | 2026 |
| NK FM Ltd | Construction | 2026 |
| NMS Welding Limited | Construction | 2016 |
| Nokotech Group Ltd | Wholesale & retail | 2021 |
| None of Your Business Ltd | Financial services | 2023 |
| Northwest Plabs Ltd | Education | 2019 |
| Norton Plastics Limited | Manufacturing | 1942 |
| Nottingham Carpets and Blinds Ltd | Wholesale & retail | 2023 |
| Nottingham Developments Limited | Construction | 2003 |
| Nottingham Packaging Supplies Ltd | Professional & scientific | 1999 |
| Nottingham Rock Asphalt Company Limited | Extraterritorial | 2001 |
| Nottingham Sports Car Club Limited | Arts & recreation | 1951 |
| Nottingham Stamp Centre Limited | Wholesale & retail | 2015 |
| Nottinghamshire Build Co Ltd | Construction | 2025 |
| Nottinghamshire Stairlifts UK Ltd | Other services | 2025 |
| Nourishandgrow Ltd | Wholesale & retail | 2020 |
| Novapath Healthcare Limited | Health & social care | 2025 |
| NR Montrecan Limited | Transport & logistics | 2025 |
| NRA Construct Limited | Construction | 2016 |
| NRA Group Limited | Financial services | 2017 |
| NRA Roofing & Flooring Services Limited | Construction | 1986 |
| NSG Education Services Ltd | Administrative & support | 2017 |
| Nueva Design Limited | Manufacturing | 2010 |
| Nursery Hollow Management Company Limited | Households | 2015 |
| Nurture Hands Ltd | Health & social care | 2025 |
| Nutbrook Garage Equipment Limited | Manufacturing | 2025 |
| Nutbrook Ltd | Construction | 2016 |
| Nutbrook Sales & Marketing Limited | Professional & scientific | 2012 |
| Nutview Limited | Real estate | 2013 |