| MC Pharmaceutical Wholesale Ltd | Wholesale & retail | 2024 |
| MC Property Pioneer Ltd | Construction | 2022 |
| MC Textile Services Ltd | Manufacturing | 2000 |
| Mc's Kitchen Limited | Hospitality | 2025 |
| MC2 Market Research Limited | Professional & scientific | 2004 |
| Mcafee Design Ltd | Professional & scientific | 2006 |
| Mcafee Projects Limited | Construction | 2021 |
| MCB Heating Ltd | Construction | 2020 |
| Mccallan Holdings Limited | Professional & scientific | 2010 |
| Mccallan Marketing Limited | Professional & scientific | 1983 |
| Mccandlish Management Services Ltd | Professional & scientific | 2015 |
| Mccann Holdings Limited | Financial services | 2024 |
| Mccoll Property Services Ltd | Real estate | 2026 |
| Mccrellis & Wilkinson's POP UP Events Ltd | Administrative & support | 2020 |
| Mccrorys Removals Ltd | Transport & logistics | 2010 |
| Mcculloch Jewellery Repairs Limited | Other services | 2021 |
| MCD Contract Services Ltd | Professional & scientific | 2024 |
| MCD Interiors Limited | Construction | 2009 |
| MCD Mechanical Ltd. | Construction | 2016 |
| MCD12 Business Services Ltd | Education | 2026 |
| Mcdaniel Procurement Solutions Limited | Administrative & support | 2010 |
| Mcdonald Building Services Limited | Construction | 2002 |
| Mcdonald Joinery Limited | Construction | 2006 |
| Mcellershaw Leisure Ltd | Arts & recreation | 2026 |
| Mcerlain (Plant) Limited | | 1974 |
| Mcewens Coaches Ltd | Transport & logistics | 2012 |
| Mcfatty Limited | Information & communication | 2018 |
| MCG Line Services Limited | Professional & scientific | 2014 |
| MCG4 Ltd | Real estate | 2020 |
| Mcgoodwin Limited | Information & communication | 2015 |
| Mcgrath Consultancy Services Limited | Health & social care | 2010 |
| Mcguirk Coaching and Consultancy (MCC) | | 2007 |
| MCH Hydraulics Limited | Manufacturing | 2004 |
| Mchale Shopfitting Limited | Construction | 2011 |
| Mcintyre Holdings Limited | Real estate | 2017 |
| MCK Healthcare Consultancy Limited | Professional & scientific | 2012 |
| MCK Legal Ltd | Administrative & support | 2020 |
| Mckenzie Capewell Cleaning Services Ltd | Administrative & support | 2023 |
| Mckenzie Made Ltd | Real estate | 2020 |
| Mckenzie Residential & Property Holdings Limited | Real estate | 2022 |
| Mckenzie Tilson Ltd | Professional & scientific | 2019 |
| Mckenzie Ventures Limited | Information & communication | 2022 |
| Mckenziestudios Ltd | Professional & scientific | 2025 |
| Mckinney Partners Ltd | Professional & scientific | 2020 |
| MCL Deliveries Limited | Hospitality | 2023 |
| Mclaughlins Surveyors Ltd | Professional & scientific | 2020 |
| Mclean & Appleton (Holdings) Limited | Professional & scientific | 1989 |
| Mclean & Appleton Limited | Professional & scientific | 1924 |
| Mclean (West Bridgford) Limited | Real estate | 2018 |
| Mclean Property Services Ltd | Real estate | 2006 |
| Mcloughlan Paving Limited | Construction | 2006 |
| MCM House Ltd | Real estate | 2023 |
| MCM Office Supplies (Holdings) Limited | Administrative & support | 2008 |
| MCM Office Supplies Limited | Wholesale & retail | 1990 |
| MCM Residential Ltd | Real estate | 2018 |
| MCM74 Limited | Construction | 2015 |
| Mcmill Homes Ltd | Construction | 2019 |
| Mcnestry Innovation Limited | Professional & scientific | 2016 |
| Mcnicol Tree Services Limited | Administrative & support | 2025 |
| MCP Development Ltd | Real estate | 2020 |
| Mcp&S: Marjoram Counselling, Psychotherapy & Supervision Ltd | Health & social care | 2019 |
| Mcpherson Property Ltd | Real estate | 2017 |
| Mcquade's Decorators Limited | Construction | 2015 |
| Mcquillan Estates Limited | Real estate | 2024 |
| Mcrai Enterprises Ltd | Health & social care | 2022 |
| Mcrt Investments Ltd | Financial services | 2021 |
| MCS Star Ltd | Wholesale & retail | 2021 |
| Mcturks Medical Ltd | Real estate | 2015 |
| Mctx Beauty Ltd | Other services | 2023 |
| MCV Midlands Limited | Administrative & support | 2005 |
| Mcvitty Civils & Plant Limited | Construction | 2015 |
| Mczhang Studio Ltd | Information & communication | 2026 |
| MD 28 Ltd | Information & communication | 2023 |
| MD Advanced Skin Clinic Eastwood Limited | Other services | 2022 |
| MD Consulting Ltd | Construction | 2025 |
| MD HGV Driver Ltd | Transport & logistics | 2025 |
| MD Legacy | Financial services | 2020 |
| MD Medical Marketing Limited | Wholesale & retail | 2012 |
| MD Sports Limited | Wholesale & retail | 2017 |
| MD Sports Rights (UK) Limited | Other services | 2002 |
| MD Travel Limited | Transport & logistics | 2026 |
| MD.L1984 Limited | Wholesale & retail | 2018 |
| MDA Creations Limited | Other services | 2008 |
| MDB Collections Limited | Construction | 2025 |
| MDB Contractors Ltd | Administrative & support | 2024 |
| MDF Export Ltd | Wholesale & retail | 2020 |
| MDG Living Ltd | Real estate | 2021 |
| MDI Asset Management Ltd | Real estate | 2022 |
| Mdik Consulting Ltd | Professional & scientific | 2024 |
| Mdis Motors Ltd | Wholesale & retail | 2025 |
| MDJ Penguin Properties Ltd | Real estate | 2025 |
| MDJ3591 Ltd | Other services | 2022 |
| Mdlv Homes Ltd | Real estate | 2025 |
| MDM Edge Limited | Health & social care | 2020 |
| MDM Insight Limited | Professional & scientific | 2024 |
| Mdmify Ltd | Information & communication | 2025 |
| MDR People Ltd | Administrative & support | 2023 |
| MDS Boutique Ltd | Wholesale & retail | 2025 |
| MDS Process UK Ltd | Professional & scientific | 2022 |
| MDT Lettings Limited | Real estate | 2021 |