| Martin Jarvis Electrical Contractors Ltd | Energy | 2025 |
| Martin Mann Industries Limited | Other services | 2018 |
| Martin Signature Build Ltd | Construction | 2025 |
| Martin Smith Limited | Extraterritorial | 2008 |
| Martin Trans Express Ltd | Transport & logistics | 2020 |
| Martin Williams Music Limited | Arts & recreation | 2006 |
| Martindale Home Improvements Ltd | Construction | 2019 |
| Martins FAB Ltd | Information & communication | 2025 |
| Martrick Limited | Professional & scientific | 2026 |
| Martyn Fisher Limited | Professional & scientific | 2016 |
| Martyn Hawes Property Maintenance Ltd | Construction | 2026 |
| Martyn Shopfitting Ltd | Construction | 2017 |
| Martyns Motorcycles Limited | Wholesale & retail | 2003 |
| Marutham Hub CIC | Education | 2025 |
| Marvel Composites Limited | Professional & scientific | 2018 |
| Marvelet Ltd. | Real estate | 2022 |
| Marvella Properties Ltd | Real estate | 2021 |
| Marvellous Spaces Ltd | Administrative & support | 2020 |
| Marwes Properties Ltd | Households | 2026 |
| Mary Broddle Embroidery Ltd | Manufacturing | 2020 |
| Mary Cockburn Consulting Limited | Professional & scientific | 2022 |
| Mary Williams ANP Limited | Health & social care | 2016 |
| Maryam Maqsood Ltd | Wholesale & retail | 2022 |
| Maryamsaffia Limited | Health & social care | 2019 |
| Marybaby Limited | Transport & logistics | 2016 |
| Marylex Tech Ltd | Information & communication | 2026 |
| Marys Jewellery Limited | Wholesale & retail | 2017 |
| Marz Trading Ltd | Administrative & support | 2021 |
| Marzyfloyd Limited | Construction | 2020 |
| MAS Fitness Ltd | Extraterritorial | 1997 |
| Masa Transport Limited | Transport & logistics | 2014 |
| Masala Bar Ltd | Hospitality | 2018 |
| Masala Catering (Nottingham) Limited | Hospitality | 2017 |
| Masala Grill Beeston Ltd | Hospitality | 2026 |
| Masala Takeaway (Nottingham) Limited | Hospitality | 2017 |
| Masgo Tradings Limited | Health & social care | 2024 |
| Mashworth Electrical Services Limited | Construction | 2024 |
| Masitee Limited | Health & social care | 2024 |
| Masjid Al-Karam Nottingham CIC | Other services | 2026 |
| Masjid Jamia Islamia Nottingham Ltd | Other services | 2024 |
| Mason Alexander Developments Ltd | Real estate | 2019 |
| Mason Alexander Property Group Ltd | Real estate | 2017 |
| Mason Domestic and Commercial Cleaning Services Limited | Administrative & support | 2024 |
| Mason Infotech Ltd. | Information & communication | 2013 |
| Mason Knows Best Limited | Professional & scientific | 2025 |
| Mason Raynor Plastering Ltd | Construction | 2022 |
| Mason White Ltd | Construction | 2025 |
| Masons Building Company Limited | Construction | 2024 |
| Masons Place Management Company Limited | Real estate | 2003 |
| Masp Gadgetvice Ltd | Wholesale & retail | 2021 |
| Mass Architecture Ltd. | Professional & scientific | 2017 |
| Mass Health Solutions Ltd | Health & social care | 2015 |
| Mass Prestige Cars Ltd | Wholesale & retail | 2025 |
| Mass Timber Design Ltd | Professional & scientific | 2024 |
| Mass Vehicle Security Ltd | Wholesale & retail | 2022 |
| Massage Therapy Clinic Ltd | Other services | 2019 |
| Massers Limited | Professional & scientific | 2001 |
| Massflinted Ltd | Wholesale & retail | 2018 |
| Massimo's Restaurants Limited | Hospitality | 2022 |
| Massive Geek Ltd | Manufacturing | 2014 |
| Massive Prizes Limited | Arts & recreation | 2026 |
| Masspro Limited | Administrative & support | 2008 |
| Masta Vape Ltd | Wholesale & retail | 2026 |
| Master Barber EM Ltd | Other services | 2020 |
| Master Barber Notts Ltd | Other services | 2021 |
| Master Building Services Ltd | Construction | 2025 |
| Master Electronic Technology Ltd | Professional & scientific | 2016 |
| Master Garage Nottingham Ltd | Wholesale & retail | 2025 |
| Master Sunny's Tuition Ltd | Education | 2020 |
| Master the Road Driving School Ltd | Education | 2024 |
| Master Your Life Limited | Professional & scientific | 2024 |
| Mastercraft Engineering Ltd | Information & communication | 2022 |
| Mastermind Business Academy Ltd | Administrative & support | 2019 |
| Mastermind Constructions Ltd | Construction | 2017 |
| Mastermind Developers Ltd | Real estate | 2015 |
| Mastermind Finance Ltd | Professional & scientific | 2020 |
| Mastermind Global Investors Ltd | Financial services | 2020 |
| Mastermind International Ltd | Education | 2017 |
| Mastermind Ltd | Extraterritorial | 2013 |
| Mastermind Masterclass Ltd | Education | 2025 |
| Mastermind Network Ltd | Administrative & support | 2019 |
| Mastermind Properties Ltd | Real estate | 2013 |
| Mastermind SPV1 Ltd | Real estate | 2017 |
| Mastermind SPV3 Ltd | Real estate | 2017 |
| Mastermind SPV4 Ltd | Real estate | 2017 |
| Mastermind SPV5 Ltd | Real estate | 2017 |
| Mastermind SPV7 Ltd | Real estate | 2017 |
| Mastermind SPV8 Ltd | Real estate | 2017 |
| Mastermind Trainers Ltd | Professional & scientific | 2020 |
| Masters Management Services Ltd | Real estate | 2003 |
| Masters Management Solutions Ltd | Professional & scientific | 2023 |
| Masters Marshalls Ltd | Professional & scientific | 2017 |
| Mastrick Holdings Ltd | Real estate | 2022 |
| Mastt Limited | Real estate | 2019 |
| Matai Solutions Ltd | Professional & scientific | 2025 |
| Matalytics Ltd | Information & communication | 2023 |
| Matane Sushi (Nottingham) Limited | Hospitality | 2021 |
| Matblack Studio Limited | Manufacturing | 2018 |
| Matbor Properties Ltd | Real estate | 2022 |
| Match Energy Limited | Professional & scientific | 2016 |