| Mpower Mental Health Ltd | Health & social care | 2023 |
| MPR Communications & Marketing Limited | Professional & scientific | 2013 |
| MPR Security Solutions Limited | Administrative & support | 2012 |
| Mprimo Tech Ltd | Information & communication | 2025 |
| MPS Marketing Services Ltd | Manufacturing | 2007 |
| MPW Electrical Limited | Construction | 2024 |
| MPW Group SW Limited | Construction | 2023 |
| MR Brown's Exclusive Ltd | Wholesale & retail | 2020 |
| MR Computer Edtech Ltd | Education | 2026 |
| MR Fast Transport Ltd | Transport & logistics | 2024 |
| MR G'S Executive Ltd | Transport & logistics | 2023 |
| MR H and Friends Limited | Information & communication | 2022 |
| MR Hall Associates Limited | Other services | 2019 |
| MR Jamie Rhodes Ltd | Construction | 2023 |
| MR Maco Ltd | Construction | 2019 |
| MR O J Bradford Limited | Health & social care | 2019 |
| MR P J Revington Ltd | Public administration | 2021 |
| MR Scaffolder Bristol Limited | Construction | 2022 |
| MR Whippy Bristol Ltd | Hospitality | 2025 |
| MR Wolfs Noodle & Nosh Ltd | Hospitality | 2002 |
| MR Yang Ltd. | Wholesale & retail | 2024 |
| MR. BMW Limited | Wholesale & retail | 2006 |
| MR. Design & Build Ltd | Construction | 2023 |
| MR. Tipsy's PUB Co Ltd | Hospitality | 2026 |
| Mr.Fix-It (Bristol) Limited | Construction | 2013 |
| MR57HAF Ltd | Hospitality | 2026 |
| Mrbmretail Ltd | Wholesale & retail | 2023 |
| MRC Electrical Solutions Ltd | Construction | 2026 |
| MRC Installation Services Limited | Manufacturing | 2016 |
| MRC2014 Ltd | Administrative & support | 2014 |
| MRD Couriers Limited | Administrative & support | 2020 |
| MRD Properties Limited | Real estate | 2000 |
| MRE CAD Solutions Ltd | Construction | 2026 |
| MRF Ceilings & Partitions Ltd | Construction | 2017 |
| MRF Interiors Ltd | Construction | 2024 |
| MRG Driving Services Limited | Transport & logistics | 2008 |
| MRG Electrical Contractors Ltd | Construction | 2025 |
| MRH Security Limited | Administrative & support | 2023 |
| MRL Holdings Ltd | Real estate | 2017 |
| MRL Pharma Group Ltd | Wholesale & retail | 2025 |
| Mrlc Limited | Construction | 2017 |
| MRM Auto Solutions Ltd | Manufacturing | 2021 |
| MRM Building & Maintenance Ltd | Construction | 2024 |
| Mrmicah Ltd | Extraterritorial | 2025 |
| Mrml Software Limited | Information & communication | 2024 |
| Mrmt Retails Ltd | Wholesale & retail | 2023 |
| Mrposta Limited | Transport & logistics | 2016 |
| MRS B'S Coffee Shop Ltd | Hospitality | 2022 |
| MRS Clutterbug Community Interest Company | Households | 2023 |
| MRS Gills Cakes Ltd | Manufacturing | 2013 |
| MRS Potts Chocolate House Limited | Hospitality | 2017 |
| Mrs.Hart Ltd | Extraterritorial | 2016 |
| MRT Properties & Investments Limited | Real estate | 2016 |
| Mrta Enterprise Limited | Other services | 2023 |
| MRW Radiology Limited | Health & social care | 2012 |
| MS Autos Cardiff Ltd | Wholesale & retail | 2017 |
| MS Carpentry Services Limited | Construction | 2006 |
| MS Change Consulting Limited | Administrative & support | 2017 |
| MS Dynamics Consulting Ltd | Information & communication | 2023 |
| MS Plumb Ltd | Construction | 2023 |
| MS Property Holdings Ltd | Real estate | 2017 |
| MS Rosa Limited | Wholesale & retail | 2018 |
| MS Techsolutions Ltd | Information & communication | 2019 |
| MS Turner Limited | Real estate | 2022 |
| MS Younie Limited | Real estate | 2004 |
| MSA Medical Ltd | Professional & scientific | 2024 |
| MSA Valeting Limited | Administrative & support | 2017 |
| Msala Library Limited | Hospitality | 2024 |
| Msala Postcode Ltd | Hospitality | 2025 |
| MSB OPT Ltd | Health & social care | 2023 |
| Msbga Properties Ltd | Real estate | 2025 |
| Msbi Solutions Ltd | Information & communication | 2013 |
| MSC (Derby) Limited | Construction | 1997 |
| MSC Group Enterprise UK Limited | Administrative & support | 2020 |
| MSC PUB Co Limited | Hospitality | 2026 |
| MSD Cornwall Medical Services Limited | Health & social care | 2022 |
| MSD Developments Limited | Construction | 2018 |
| MSD Homes Limited | Real estate | 2005 |
| MSD Security Ltd | Administrative & support | 2019 |
| Msdn-International Ltd | Professional & scientific | 2025 |
| MSH Construction (Bristol) Limited | Professional & scientific | 2018 |
| MSH Studios Ltd | Information & communication | 2021 |
| MSH Telecom Services Limited | Information & communication | 2021 |
| MSI Property Management Ltd | Hospitality | 2025 |
| MSJ Builds Ltd | Construction | 2021 |
| MSJ Developments(Bristol) Limited | Real estate | 2019 |
| MSJ Property Services Limited | Construction | 2023 |
| MSK Convenience Store Ltd | Wholesale & retail | 2021 |
| MSK Imaging Limited | Health & social care | 2016 |
| MSM UK Holdings Limited | Financial services | 2025 |
| MSN Logistic Limited | Transport & logistics | 2025 |
| Msnow Holdings Ltd | Information & communication | 2025 |
| MSP Family Limited | Wholesale & retail | 2026 |
| MSR Energy Limited | Wholesale & retail | 2026 |
| MSS Associates Ltd | Administrative & support | 2007 |
| MSS Medicolegal Ltd | Professional & scientific | 2009 |
| MSS Scaffolding Ltd | Construction | 2024 |
| MSS Wireless Limited | Information & communication | 2016 |
| Mssm Lettings Ltd | Real estate | 2025 |
| Msta Retail Limited | Wholesale & retail | 2025 |