| Muntu Circle Ltd | Professional & scientific | 2026 |
| Munyard Commercial Properties Limited | Real estate | 2015 |
| Mupack Ltd | Administrative & support | 2019 |
| Mura Interiors Ltd | Wholesale & retail | 2026 |
| Murden Burton UK Limited | Real estate | 2017 |
| Murfins Joinery and Maintenance Ltd | Construction | 2022 |
| Murfins Plumbing and Heating Ltd | Construction | 2016 |
| Murkin Installations Ltd | Construction | 2023 |
| Murlock Limited | Financial services | 2025 |
| Murlock Properties Ltd | Real estate | 2024 |
| Murphy Design Limited | Construction | 2009 |
| Murrain Building Ltd | Other services | 2025 |
| Murray Leisure Limited | Hospitality | 2018 |
| Murrell & Sons Ltd | Real estate | 2022 |
| Musani Security Ltd | Administrative & support | 2024 |
| Musemakes Ltd | Manufacturing | 2026 |
| Mushore Ltd | Health & social care | 2022 |
| Music & Lights Disco's Ltd | Arts & recreation | 2024 |
| Music & Mind Ltd | Arts & recreation | 2023 |
| Music Shed Studios Ltd | Administrative & support | 2017 |
| Musokiri Ltd | Health & social care | 2023 |
| Musrab Ltd | Wholesale & retail | 2024 |
| Mustafa Ashraf Trading and Investments Ltd | Wholesale & retail | 2025 |
| Mustops Ltd | Information & communication | 2024 |
| Muzi Enterprises Ltd | Health & social care | 2026 |
| MVO Partnership Limited | Real estate | 2022 |
| MVS Auto Service & Repair Limited | Wholesale & retail | 2017 |
| MW Controls & Calibration Ltd | Manufacturing | 2022 |
| MW Procurement and Commercial Ltd | Professional & scientific | 2026 |
| MW Propco (Mids) Ltd | Real estate | 2025 |
| MW Trading Co Limited | Manufacturing | 2020 |
| Mwan Mini Market Limited | Wholesale & retail | 2022 |
| MX Display Group Limited | Financial services | 2014 |
| MX Display Limited | Professional & scientific | 1996 |
| MX Fabrications Limited | Manufacturing | 2010 |
| MX Holdings Limited | Professional & scientific | 2000 |
| My 8ASKET Ltd | Wholesale & retail | 2022 |
| My Cannes Properties Limited | Real estate | 2012 |
| My Choice My Life CIC | Health & social care | 2017 |
| My Cosmetic Surgery Clinic UK Limited | Health & social care | 2026 |
| My Cosmetic Surgery UK Limited | Health & social care | 2010 |
| My Dera Nottingham Limited | Hospitality | 2026 |
| My Digital Ventures Ltd | Wholesale & retail | 2024 |
| My Fave List Limited | Information & communication | 2016 |
| My Finance Friend Limited | Financial services | 2015 |
| My Freedom Coaching Limited | Health & social care | 2023 |
| My Grade Medical Ltd | Other services | 2024 |
| My Great Estate Limited | Real estate | 2020 |
| My Hydrogen Water Ltd | Wholesale & retail | 2025 |
| My Interiors Derby Ltd | Construction | 2020 |
| My Mary Poppins Ltd | Other services | 2011 |
| My Messy Play Ltd | Education | 2020 |
| My Own COP Limited | Administrative & support | 2021 |
| My PAD Derby Ltd | Real estate | 2012 |
| My Pindi Ltd | Hospitality | 2026 |
| My Purple Rose Ltd | Wholesale & retail | 2016 |
| My Skin Aesthetics Ltd | Health & social care | 2023 |
| My Skin Aesthetics Training Academy Ltd | Education | 2023 |
| My Sweet Estate Ltd | Real estate | 2018 |
| My Temporary Nanny Ltd | Administrative & support | 2019 |
| My the Orchards Ltd | Health & social care | 2015 |
| My UK Home Limited | Real estate | 2021 |
| My Virtual Hair Salon Limited | Education | 2022 |
| MY5C'S Ltd | Manufacturing | 2024 |
| Myabode Properties Ltd | Real estate | 2025 |
| Myas Construction Ltd | Construction | 2025 |
| Myaware | Health & social care | 1995 |
| Mybay Ltd | Wholesale & retail | 2025 |
| Mycarexport Ltd | Professional & scientific | 2022 |
| Mychecroft Drive Management Company Limited | Households | 2023 |
| Myco Design Limited | Professional & scientific | 2024 |
| Myco Installations Limited | Construction | 2002 |
| Mycosiauk CIC | Agriculture & fishing | 2024 |
| MYE Renewables Ltd | Construction | 2014 |
| Mygcsemaths Limited | Education | 2025 |
| Myhalalone Ltd | Information & communication | 2026 |
| MYM Properties Ltd | Real estate | 2025 |
| Mynapreneurs Limited | Information & communication | 2015 |
| Mypad 2020 Limited | Construction | 2019 |
| Myrms Ltd | Information & communication | 2026 |
| Mysh and Qooys Ltd | Professional & scientific | 2024 |
| MYTOP3 Ltd | Information & communication | 2015 |
| Mytyk Multi-Gastro Ltd | Hospitality | 2025 |
| Myziu Ltd | Other services | 2017 |
| MZ Asian Collection Ltd | Wholesale & retail | 2025 |
| MZA PVT Ltd | Transport & logistics | 2020 |
| Mzhtrades Ltd | Wholesale & retail | 2025 |
| MZM Estates Ltd | Financial services | 2019 |
| Mâconic Ltd | Professional & scientific | 2024 |
| N & a Logistics Limited | Transport & logistics | 2015 |
| N & D Consult Limited | Professional & scientific | 2018 |
| N & L Stone Property Ltd | Hospitality | 2023 |
| N C Marshall Electrical Contractors Limited | Construction | 2018 |
| N D Redfern Limited | Manufacturing | 2012 |
| N E Pallets Limited | Real estate | 2002 |
| N H Bookkeeping Solutions Limited | Professional & scientific | 2015 |
| N I R (Derby) Limited | Health & social care | 2013 |
| N J Allsop Limited | Manufacturing | 2025 |
| N J Byrne Limited | Construction | 2014 |
| N K Building Contractors Ltd | Professional & scientific | 2006 |