| Martin Events Limited | Arts & recreation | 2025 |
| Martin Hill Contracts Ltd | Professional & scientific | 2024 |
| Martin Lloyd Projects Ltd | Professional & scientific | 2013 |
| Martin Trask & Family Funeral Directors Ltd | Other services | 2025 |
| Martin Wynn James Limited | Health & social care | 2012 |
| Martins Fruits Limited | Wholesale & retail | 2003 |
| Martyn Barratt Transport Limited | Transport & logistics | 2000 |
| Martyn Hanmore Limited | Professional & scientific | 2018 |
| Marusya Limited | Transport & logistics | 2014 |
| Maruvik Ltd | Wholesale & retail | 2026 |
| Marvel Lets Ltd | Hospitality | 2018 |
| Marvel Natural Products Ltd | Manufacturing | 2020 |
| Marvellous Mojo Limited | Professional & scientific | 2021 |
| Marvellous Supreme Security Ltd | Administrative & support | 2022 |
| Marwyn Materials (UK) Limited | Professional & scientific | 2008 |
| Mary.Boris Ltd | Health & social care | 2023 |
| MAS Fire Sure Consultancy Ltd | Public administration | 2026 |
| MAS Plant Hire Limited | Administrative & support | 2014 |
| Masala Derby Limited | Hospitality | 2022 |
| Masala HUT Midlands Limited | Hospitality | 2025 |
| Mascd Ltd | Information & communication | 2020 |
| Mascotta Properties Limited | Extraterritorial | 1990 |
| Masderby Limited | Wholesale & retail | 2025 |
| Mash UP Derby Ltd | Education | 2015 |
| Masif Sports Agency Limited | Arts & recreation | 2025 |
| Masifcs Ltd | Wholesale & retail | 2024 |
| Maso-Udeniny Derby Ltd | Wholesale & retail | 2024 |
| Mason AF Limited | Real estate | 2026 |
| Mason Warden Ltd | Administrative & support | 1999 |
| Massala Nights Derby Ltd | Hospitality | 2024 |
| Massey Ltd | Wholesale & retail | 2025 |
| Masson Property Group Limited | Professional & scientific | 2024 |
| Masst Property Ltd | Real estate | 2019 |
| Master CY Limited | Other services | 2026 |
| Master PK Group Ltd | Financial services | 2026 |
| Mastercars (Derby) Limited | Wholesale & retail | 2003 |
| Mastermind Computers Limited | Administrative & support | 2013 |
| Masterpiece Creations Limited | Manufacturing | 2025 |
| Masters Barber Limited | Other services | 2025 |
| Masteryecom Ltd | Administrative & support | 2022 |
| Mastihari Village (Greycat) Ltd | Administrative & support | 2016 |
| Matal Limited | Health & social care | 2018 |
| Matcpd Limited | Education | 2024 |
| Matelot Fire Protection Ltd | Other services | 2024 |
| Materials Engineering (U.K.) Limited | Professional & scientific | 1996 |
| Materialsstoreonline Ltd | Wholesale & retail | 2026 |
| Mates-Derby Ltd | Transport & logistics | 2016 |
| Matey Pubs Limited | Hospitality | 2026 |
| Mather & Partners Limited | Wholesale & retail | 2025 |
| Mather Developments Ltd | Construction | 2024 |
| Mathers Property Ltd | Real estate | 2022 |
| Mathews Fusion Kitchen Ltd | Hospitality | 2026 |
| Mathieson's Development Ltd | Construction | 2019 |
| Mathis Engineering Ltd | Professional & scientific | 2021 |
| Matik Studio Ltd | Professional & scientific | 2025 |
| Matrix CAD Ltd | Professional & scientific | 2009 |
| Matrix Headgear Ltd | Administrative & support | 2016 |
| Matrix PA Hire Ltd | Administrative & support | 2022 |
| Matrix Protection Gear UK Ltd | Administrative & support | 2016 |
| Matrix Solicitors Limited | Professional & scientific | 2010 |
| Matron Productions Limited | Information & communication | 2009 |
| Mats Property Services Limited | Real estate | 2017 |
| Matsaw Transport Ltd | Transport & logistics | 2021 |
| Matt Barnett (Barrister) Limited | Professional & scientific | 2021 |
| Matt Bestwick Construction Ltd | Construction | 2026 |
| Matt Coleman Limited | Financial services | 2022 |
| Matt Investments Limited | Financial services | 2025 |
| Matt Munday Adventures Ltd | Professional & scientific | 2022 |
| Matt Strafford Limited | Arts & recreation | 2014 |
| Matte Interiors Holdings Limited | Real estate | 2025 |
| Matte Interiors Limited | Construction | 2017 |
| Matter South Yorkshire CIC | Health & social care | 2023 |
| Matthew Adshead Consulting and Events Limited | Professional & scientific | 2014 |
| Matthew Hunter Joinery Ltd | Construction | 2014 |
| Matthew Hyde Engineering Limited | Manufacturing | 2022 |
| Matthew Nuttall Tattoo Limited | Arts & recreation | 2018 |
| Matthew Palmer Online Ltd | Other services | 2014 |
| Mattom Holdings Limited | Financial services | 2025 |
| Maumy and Askham Properties Limited | Real estate | 2025 |
| Maur Music Limited | Information & communication | 2021 |
| Mauve (Eco) Ltd | Agriculture & fishing | 2021 |
| Maverick Wealth Limited | Real estate | 2021 |
| Mavlom Care Ltd | Health & social care | 2015 |
| Mawes Agency Ltd | Transport & logistics | 2018 |
| Mawes Transportation Limited | Construction | 2019 |
| MAX ALI Investments Ltd | Households | 2026 |
| MAX Black Estates Limited | Construction | 2019 |
| MAX Earthworks Ltd | Water & waste | 2021 |
| MAX Plant (Midlands) Limited | Water & waste | 2005 |
| Maxelia Group Ltd. | Professional & scientific | 2025 |
| Maxfix Ltd | Wholesale & retail | 2025 |
| Maxgro Solutions Ltd | Professional & scientific | 2022 |
| Maxillofacial Care Ventures LLP | | 2025 |
| Maxroam Ltd | Information & communication | 2011 |
| Maxwell & Maxwell Associates Ltd | Professional & scientific | 2016 |
| Maxwell H2O Limited | Wholesale & retail | 2025 |
| Maxwell John Property Group Ltd | Real estate | 2019 |
| Maxwell Knight Ltd | Information & communication | 2014 |
| MAY29 Limited | Wholesale & retail | 2017 |
| Maya Grace Properties Ltd | Real estate | 2025 |