| Millpledge Europe Ltd | Professional & scientific | 2012 |
| Millpledge Group Limited | Administrative & support | 1996 |
| Millpledge Limited | Manufacturing | 1976 |
| Millpledge Pharmaceuticals Limited | Professional & scientific | 1981 |
| Millpledge Surgicals Limited | Manufacturing | 1988 |
| Millpledge Systems Limited | Manufacturing | 1987 |
| Milnercroft 1959 Limited | Extraterritorial | 2014 |
| Miran Group Holdings Ltd | Professional & scientific | 2025 |
| Misterton Bathrooms Ltd | Construction | 2022 |
| Misterton Holiday Park Limited | Hospitality | 2020 |
| Mitchconsult Ltd | Other services | 2023 |
| Mitton & Dixon Ltd | Construction | 2024 |
| MJB Insight Ltd | Professional & scientific | 2023 |
| MLR Internazionale Ltd | Professional & scientific | 2019 |
| MMC Inns Limited | Hospitality | 2020 |
| MMC Lettings Limited | Real estate | 2025 |
| MMS (Retford) Ltd | Administrative & support | 2017 |
| MND Associates Limited | Information & communication | 2009 |
| Mobile Soil Testing Ltd | Water & waste | 2024 |
| Modular Property Maintenance Ltd | Administrative & support | 2025 |
| Moleworks Limited | Information & communication | 2017 |
| Molis Broadcasting Services Ltd | Information & communication | 2022 |
| Mollusc Limited | Extraterritorial | 2004 |
| Montana Marketing Limited | Administrative & support | 2004 |
| Moody Auctions Holdings Limited | Financial services | 2015 |
| Moody Auctions Limited | Wholesale & retail | 2000 |
| Moody Process Equipment Limited | Wholesale & retail | 2017 |
| Morgan Lowe Bucknall Ltd | Construction | 2022 |
| Morgan Lowe Homes Ltd | Construction | 2020 |
| Morning Club Clothing Limited | Wholesale & retail | 2020 |
| Morton Michel Holdings Limited | Financial services | 2011 |
| Morton Michel Limited | Administrative & support | 2004 |
| Morton Nurseries Ltd | Wholesale & retail | 2008 |
| Mortons Building Services Ltd | Construction | 2022 |
| Moss Vehicle Movements Limited | Wholesale & retail | 2022 |
| Motatsi Properties Limited | Real estate | 2022 |
| Moth and Lantern Limited | Hospitality | 2012 |
| Motivational Training Limited | Other services | 2000 |
| Motus Promotions Ltd | Administrative & support | 2019 |
| Move Better Run Better Limited | Education | 2018 |
| MP Pallets Limited | Administrative & support | 2011 |
| MPT Services and Equipment Ltd | Professional & scientific | 2023 |
| MR Handy Limited | Construction | 2017 |
| MR Handy Local Limited | Construction | 2017 |
| MR Handy.Com Limited | Other services | 2015 |
| MS & MS Limited | Real estate | 2006 |
| MS Sporthorses Ltd | Arts & recreation | 2019 |
| MSP Case Management Ltd | Administrative & support | 2015 |
| MTS Civil Engineering Limited | Construction | 2023 |
| MUD PIE Properties Ltd | Real estate | 2024 |
| Mulberry House Wealth Management Ltd | Professional & scientific | 2023 |
| Mulberry Sports and Classics Limited | Wholesale & retail | 2024 |
| Multi Core Communications Ltd | Information & communication | 2021 |
| Mumpath Limited | Information & communication | 2026 |
| Musson Limited | Construction | 2022 |
| MV Construction (GB) Limited | Construction | 2009 |
| MV Investment Properties Limited | Real estate | 2020 |
| My Brush Box UK Limited | Wholesale & retail | 2025 |
| My Dog Rocks Ltd | Wholesale & retail | 2025 |
| My First Style Ltd | Construction | 2021 |
| My Playful World Limited | Arts & recreation | 2020 |
| N & P Property Services Limited | Administrative & support | 2022 |
| N & S Projects Limited | Financial services | 2023 |
| Naish (Wheatley) Limited | Construction | 1954 |
| Napkin Schematics Ltd | Wholesale & retail | 2025 |
| Nath Engineering Limited | Manufacturing | 2021 |
| Naylor & Wagstaff Ltd | Financial services | 2023 |
| NCI Consultants Limited | Financial services | 2000 |
| NCI Insurance Services Limited | Financial services | 2003 |
| Neskara Ltd | Wholesale & retail | 2022 |
| Netalawyer Ltd | Professional & scientific | 2014 |
| New Cloud Properties Ltd | Hospitality | 2020 |
| New IS Nice Ltd | Wholesale & retail | 2019 |
| Newark Glass Group Limited | Administrative & support | 1998 |
| Newbert Equine Limited | Manufacturing | 2006 |
| Newfield Distribution Limited | Transport & logistics | 2018 |
| Newfield Warehousing Ltd | Transport & logistics | 2025 |
| Newman Agricultural Limited | Agriculture & fishing | 2018 |
| Next Level Renovations Ltd | Construction | 2024 |
| NGB Fitness Ltd | Arts & recreation | 2017 |
| Nguyen HA Ltd | Real estate | 2025 |
| Niagara Escarpment Limited | Arts & recreation | 2022 |
| Nicanor Properties Limited | Real estate | 2020 |
| Nicholsons Estate Agents Ltd | Real estate | 2023 |
| Nick Bland & SON Installations Limited | Manufacturing | 2016 |
| Nick Spires Holdings Ltd | Wholesale & retail | 2023 |
| Nigel Doughty Accounting Services Ltd | Professional & scientific | 2021 |
| Niko Chesterfield Ltd | Hospitality | 2024 |
| NO 5 Restaurant & Wine Bar Ltd | Hospitality | 2023 |
| NO Worries Exterior Cleaning Limited | Administrative & support | 2021 |
| NO38 Lettings Ltd | Hospitality | 2026 |
| Nominus Limited | Professional & scientific | 2006 |
| Nordis Financial Planning Limited | Professional & scientific | 2024 |
| Noreen Wilkinson Ltd | Education | 2013 |
| North American Boarding Schools Workshop Ltd | Education | 2007 |
| North Nottinghamshire Physiotherapy Ltd | Public administration | 2018 |
| North Notts & Lincs CRP CIC | Transport & logistics | 2020 |
| North Notts Artisan and Tourist Information Centre C.I.C. | Wholesale & retail | 2015 |
| North Notts Communication Limited | Information & communication | 2018 |
| North Notts Health Ltd | Real estate | 2020 |