| MR Heer Transport Ltd | Transport & logistics | 2021 |
| MR Legal Limited | Professional & scientific | 2021 |
| MR Mustards Limited | Hospitality | 2015 |
| MR Online Provides Ltd | Wholesale & retail | 2025 |
| MR Pizza (Derby) Limited | Hospitality | 2021 |
| MR Shaw Limited | Wholesale & retail | 2016 |
| MR Shaw's House Ltd | Other services | 2022 |
| MR Singh Haulage Ltd | Other services | 2023 |
| MR Tee's Derby Limited | Hospitality | 2025 |
| MR Tyres Midland Ltd | Wholesale & retail | 2025 |
| MR Whoosh Ltd | Water & waste | 2010 |
| Mr.D.I.Y Property Maintenance Limited | Construction | 2019 |
| MRD CONSTRUCT1ONS Ltd | Construction | 2025 |
| MRF Fire & Safety Solutions Limited | Professional & scientific | 2018 |
| MRH 3 Ltd | Hospitality | 2017 |
| Mrmyst Ltd | Wholesale & retail | 2025 |
| MRP Engineering Limited | Manufacturing | 2017 |
| Mrpiri Limited | Hospitality | 2026 |
| MRS Lady Lorraine and the Navigation Inn 2018 Limited | Hospitality | 2018 |
| Mrsmithgroup Limited | Professional & scientific | 2011 |
| Mrsmithholdings Limited | Administrative & support | 2020 |
| Mrsmithleisure Limited | Other services | 2014 |
| Mrsmithmanagement Limited | Professional & scientific | 2015 |
| Mrsmithproperty Limited | Other services | 2014 |
| Mrsmithresource Ltd | Other services | 2011 |
| MRT Consultancy Services Ltd | Information & communication | 2018 |
| MRW Engineering Consultancy Ltd | Professional & scientific | 2017 |
| MS City Traders UK Ltd | Wholesale & retail | 2024 |
| MS Construction Consultants Limited | Professional & scientific | 2019 |
| MS Jointing Limited | Manufacturing | 2008 |
| MS Media Consulting Ltd | Professional & scientific | 2023 |
| MS O’Brien Holdings Limited | Construction | 2022 |
| MS Panel Solution Ltd | Manufacturing | 2024 |
| MS Paneltech Limited | Manufacturing | 2013 |
| MS Quality Stays Ltd | Real estate | 2025 |
| MS Transformation Consultancy Ltd | Professional & scientific | 2019 |
| Ms-Rt Leasing Limited | Administrative & support | 2021 |
| MS2024 Limited | Construction | 2024 |
| MS28 Ltd | Real estate | 2023 |
| MSA Accountants Limited | Professional & scientific | 2023 |
| Msah Services Ltd | Information & communication | 2021 |
| MSC Corporate Ltd | Professional & scientific | 2018 |
| MSD Building Limited | Construction | 2023 |
| MSD Pest Control Ltd | Agriculture & fishing | 2023 |
| MSG Midlands Construct Limited | Construction | 2025 |
| MSG Tours Ltd | Administrative & support | 2015 |
| MSH (Derby) Limited | Hospitality | 2003 |
| MSH Capital Group Limited | Real estate | 2026 |
| MSJ Consulting Solutions Ltd | Professional & scientific | 2023 |
| MSJ Windows Limited | Construction | 2022 |
| Msjslb Limited | Manufacturing | 2024 |
| MSM Medical Services Ltd | Health & social care | 2016 |
| MSM Transport Derby Ltd | Transport & logistics | 2025 |
| Msmotorgroup Ltd | Extraterritorial | 2024 |
| MSN Actuarial Services Ltd | Financial services | 2018 |
| MSR Real Estate Ltd | Real estate | 2023 |
| MSS One Properties Limited | Financial services | 2025 |
| MSS Properties Limited | Construction | 2015 |
| MST Limited | Transport & logistics | 2024 |
| MST Sports Timing Limited | Extraterritorial | 2026 |
| MST Timing Limited | Professional & scientific | 2005 |
| MSW PUB Company Ltd | Hospitality | 2014 |
| MSZ0985 Ltd | Wholesale & retail | 2014 |
| MT Cleaning Services EMD Ltd | Administrative & support | 2023 |
| MT Everest Restaurant & Bar Ltd | Hospitality | 2019 |
| MT Harvey Projects Ltd | Real estate | 2017 |
| MT Services (Derbyshire) Limited | Administrative & support | 2012 |
| MTD Brickwork Ltd | Construction | 2019 |
| MTK Technology Limited | Manufacturing | 2009 |
| MTL Caravans and Motorhomes Limited | Wholesale & retail | 2025 |
| MTP Homes Limited | Real estate | 2017 |
| Mtshina Ltd | Wholesale & retail | 2025 |
| MTV Consultants Limited | Administrative & support | 2024 |
| MTW Enterprise Limited | Transport & logistics | 2018 |
| Mtzms Limited | Health & social care | 2023 |
| Muca Builders & Joiners Limited | Construction | 2023 |
| Mucky Vagrant Soapery Ltd | Manufacturing | 2026 |
| Mughal Driving School Ltd | Education | 2022 |
| Mughal Intensive Driving School Ltd | Education | 2024 |
| Muhammad Ahvar Ltd | Transport & logistics | 2025 |
| Muhammadismael Ltd | Wholesale & retail | 2025 |
| Mulberry Barn Living Ltd | Wholesale & retail | 2025 |
| Mulberry Beauty Salon Limited | Other services | 2008 |
| Mulberry Court (Supported Living) Limited | Health & social care | 2003 |
| Mulberry Fields (Southwater) Management Company Limited | Households | 2017 |
| Mulcare Limited | Real estate | 2021 |
| Mulholland Automotive Ltd | Manufacturing | 2019 |
| Mulholland Property Investments Ltd | Real estate | 2024 |
| Mullenscote Park Homes Limited | Real estate | 2023 |
| Mullins Equipment Hire Limited | Construction | 2021 |
| Multi Careserv Ltd | Health & social care | 2023 |
| Multi Trades Property Services Ltd | Construction | 2023 |
| MUM Bargains Ltd | Wholesale & retail | 2025 |
| Mums Kitchen & Cafe Ltd | Hospitality | 2026 |
| Mumz Kitchen Ltd | Hospitality | 2024 |
| Munco International Limited | Wholesale & retail | 1993 |
| Mundassery Ltd | Information & communication | 2019 |
| Mundy Structural Steel Company Limited | Construction | 1984 |
| Mundys Malabar Ltd | Hospitality | 2025 |
| Munro Technical Solutions Limited | Information & communication | 2015 |