| LTR Remapping Ltd | Manufacturing | 2026 |
| Lucanol Productions Limited | Information & communication | 2018 |
| Lucky Monty Ltd | Transport & logistics | 2016 |
| Luna LUX Design Ltd | Wholesale & retail | 2022 |
| Lunascan Limited | Health & social care | 2025 |
| Luxor Real Estate Limited | Real estate | 2024 |
| Luxta Limited | Hospitality | 2018 |
| LW Barker Transport Services Limited | Transport & logistics | 2016 |
| LW Barkers Holdings Limited | Financial services | 2023 |
| LYB Melts and More Ltd | Wholesale & retail | 2022 |
| Lynher Associates Limited | Professional & scientific | 1994 |
| Lyran Construction Ltd | Construction | 2026 |
| M & B Container Hire & Sales Limited | Wholesale & retail | 2006 |
| M & C Sheldon Limited | Agriculture & fishing | 2008 |
| M & G Energy Limited | Energy | 2014 |
| M & K Barkas Ltd | Agriculture & fishing | 2025 |
| M & P Export Limited | Professional & scientific | 2012 |
| M & R Systems Ltd | Other services | 2023 |
| M & S Contractors (Newark) Limited | Agriculture & fishing | 2014 |
| M Harris (Spiritus) Limited | Health & social care | 2004 |
| M J Connole Limited | Administrative & support | 2003 |
| M Jackson Electrical Limited | Construction | 2003 |
| M O'Boyle Joinery Limited | Construction | 2017 |
| M P Glass (Ollerton) Limited | Construction | 2023 |
| M Peet Ltd | Wholesale & retail | 2020 |
| M R Steel and Lifting Limited | Construction | 2023 |
| M S Lapa Ltd | Transport & logistics | 2019 |
| M Welch Supplies Limited | Wholesale & retail | 2007 |
| M&C Property Transformations Ltd | Construction | 2025 |
| M&J Super Houses Ltd | Hospitality | 2021 |
| M&K Ward Property Services Ltd | Real estate | 2024 |
| M&N Building Service Limited | Construction | 2019 |
| M.E. Mechanical Ltd | Construction | 2020 |
| M.I.N. Company Group Limited | Construction | 2025 |
| M.L. Furnaces Limited | Manufacturing | 2002 |
| MA MA Thai Express Ltd | Hospitality | 2024 |
| Macs Occupational Health Ltd | Health & social care | 2012 |
| Madamesophia Ltd | Wholesale & retail | 2025 |
| Made in Nottingham Ltd | Professional & scientific | 2008 |
| Madison Court (Salford) Management Company Limited | Real estate | 2006 |
| Mae's Boutique Limited | Wholesale & retail | 2025 |
| Magnet Insurance Services Ltd | Financial services | 2008 |
| Magnum Opus Management Limited | Households | 2004 |
| Mahraj Ltd | Hospitality | 2020 |
| Maideyi Janda Ltd | Health & social care | 2023 |
| Mailprint (UK) Limited | Financial services | 1998 |
| Mainly Wood Ltd | Manufacturing | 2021 |
| Maison Freeholds Ltd | Real estate | 2026 |
| Maison MAE Ltd | Real estate | 2021 |
| MAJ Consultancy Ltd | Professional & scientific | 2020 |
| Majestic Roofing & Cladding Ltd | Construction | 2016 |
| Major Oak Developments Limited | Construction | 2020 |
| Major Oak Food Associates Limited | Hospitality | 2009 |
| Major Oak Hire & Sales Limited | Wholesale & retail | 2024 |
| Majors Construction Limited | Water & waste | 2005 |
| Malbec 59 Ltd | Administrative & support | 2021 |
| Mallion Property Ltd | Real estate | 2020 |
| Management Company IVY Gardens Bilsthorpe Limited | Households | 2021 |
| Mander Coaching Ltd | Professional & scientific | 2023 |
| Manitou Consulting Limited | Professional & scientific | 2024 |
| Manksco Limited | Construction | 2017 |
| Manksco Properties Ltd | Real estate | 2011 |
| Manor Farm Holdings (Dunham) Limited | Agriculture & fishing | 2025 |
| Manor Farming Limited | Agriculture & fishing | 2003 |
| Manor House Fitness (Notts) Limited | Arts & recreation | 2019 |
| Manor Site Services Limited | Extraterritorial | 2009 |
| Manor View Caunton Limited | Households | 2001 |
| Maple Court (Kingston) Limited | Households | 2019 |
| Maplebeck Farming Ltd | Agriculture & fishing | 2001 |
| Mapperley Electrical Services Ltd | Construction | 2013 |
| Marchbuild Limited | Construction | 2017 |
| Marchman Properties Limited | Real estate | 2013 |
| Marek Kopinski Ltd | Transport & logistics | 2024 |
| Marhaylyn Ltd | Professional & scientific | 2012 |
| Marie G Cctv Ltd | Construction | 2024 |
| Marie G Construct Ltd | Construction | 2024 |
| Mark Brown AEA Limited | Professional & scientific | 2013 |
| Mark Hawkins Limited | Professional & scientific | 2009 |
| Mark Hough Transport Ltd | Transport & logistics | 2026 |
| Mark Innes Consultants Limited | Extraterritorial | 2006 |
| Mark Pritchard Electrical Services Limited | Manufacturing | 2003 |
| Mark Teeder Ltd | Construction | 2019 |
| Mark Trans Delivery Ltd | Transport & logistics | 2020 |
| Mark Watson Consulting Limited | Construction | 2014 |
| Marked Difference Ltd | Professional & scientific | 2021 |
| Markham Moor Transport Limited | Transport & logistics | 1983 |
| Marleah Ltd | Wholesale & retail | 2022 |
| Marleybrowkneez Ltd | Hospitality | 2022 |
| Marsh Lane Stores Ltd | Wholesale & retail | 2024 |
| Marshall & Greaves Music LLP | | 2026 |
| Marshall (Sutton) Holdings Limited | Financial services | 2019 |
| Marshall Quality Management Services Ltd | Administrative & support | 2025 |
| Marshall Walker (Newark) Limited | Professional & scientific | 2012 |
| Marshalls of Sutton-On-Trent Limited | Transport & logistics | 2006 |
| Martin Clurow Fitness Limited | Administrative & support | 2017 |
| Martin Fish Limited | Arts & recreation | 2002 |
| Martins Home Furnishings Limited | Manufacturing | 2018 |
| Marvid Building & Conservation Limited | Construction | 2010 |
| Marylil Group Limited | Financial services | 2016 |
| Mastercraft Interiors Ltd | Construction | 2003 |