| Mintac Limited | Information & communication | 2011 |
| Mintmotif Ltd | Wholesale & retail | 2023 |
| Minton Communications Ltd | Information & communication | 2007 |
| Minton Property Limited | Real estate | 2020 |
| Mintonfilm Limited | Information & communication | 2013 |
| Minty Noodles Ltd | Professional & scientific | 2023 |
| Minute MAX Ltd | Wholesale & retail | 2023 |
| Mipe Management Ltd | Professional & scientific | 2014 |
| MIR Bristol Ltd | Wholesale & retail | 2025 |
| Mira Propco Limited | Real estate | 2025 |
| Mirabello Kitchens Ltd | Construction | 2023 |
| Miracle International Contracting & Trading Co. Ltd | Manufacturing | 2022 |
| Miradry Limited | Wholesale & retail | 2022 |
| Mirahbell Beauty Ltd | Other services | 2021 |
| Miramar Productions Ltd | Information & communication | 2018 |
| Miranda Hollings Consultancy Limited | Information & communication | 2023 |
| Miraporto Ltd | Other services | 2025 |
| Mirare Limited | Professional & scientific | 2010 |
| Miravos AI Limited | Information & communication | 2026 |
| Mirbeen Ltd | Information & communication | 2025 |
| Mircom Properties Limited | Real estate | 2023 |
| Mireku Marketing Ltd | Professional & scientific | 2021 |
| Mirembe Enterprise Ltd | Health & social care | 2020 |
| Mirfab Ltd | Construction | 2016 |
| Miri Katz Design Ltd | Administrative & support | 2014 |
| Mirkaan Limited | Real estate | 2025 |
| Mirreh Ltd | Construction | 2018 |
| Mirror Barber Ltd | Other services | 2026 |
| Mirwall Ltd | Wholesale & retail | 2005 |
| Mirza Catering Ltd | Hospitality | 2022 |
| Mirzada Fresh Food Ltd | Hospitality | 2025 |
| MIS Accountancy Limited | Professional & scientific | 2022 |
| MIS Fast Food Ltd | Hospitality | 2023 |
| Miscellen Ltd. | Information & communication | 2016 |
| Mischievous Wolf Limited | Professional & scientific | 1986 |
| Miser Limited | Hospitality | 2020 |
| Mishal Care Limited | Health & social care | 2016 |
| Mishmish Properties Limited | Construction | 2014 |
| Misilo Property Management Ltd | Households | 2021 |
| Miskella Construction Limited | Construction | 2016 |
| Mismark Limited | Households | 1973 |
| Misplaced Ltd | Arts & recreation | 2021 |
| Missiato Consultancy Limited | Professional & scientific | 2024 |
| Missiato Estates Limited | Real estate | 2021 |
| Missiato Group Limited | Real estate | 2022 |
| Missiato Limited | Construction | 2015 |
| Mission Collective Ltd | Professional & scientific | 2018 |
| Mission Decisions Ltd | Information & communication | 2023 |
| Mission Essential International UK Limited | Professional & scientific | 2023 |
| Mission Science Ltd | Professional & scientific | 2025 |
| Mission Spiritus Limited | Extraterritorial | 2024 |
| Mission Stem CIC | Education | 2024 |
| Misstpb Ltd | Health & social care | 2025 |
| Mister Car Cosmetics Ltd | Wholesale & retail | 2022 |
| Mister Lemons Limited | Information & communication | 2017 |
| Mister Oven Limited | Administrative & support | 2015 |
| Mistry Build Ltd | Construction | 2026 |
| Mistskill Limited | Extraterritorial | 1982 |
| Misty Falcon Consultancy Limited | Professional & scientific | 2015 |
| Misvi Ltd | Construction | 2025 |
| Mitax Consulting Ltd | Information & communication | 2010 |
| Mitchell & Co Building Services Limited | Construction | 2004 |
| Mitchell Brook Gardens NO. 6 Residents Company Limited | Households | 1989 |
| Mitchell Design & Build Ltd | Construction | 2015 |
| Mitchell Glanville (Bristol) Limited | Professional & scientific | 2013 |
| Mito Bristol Ltd | Wholesale & retail | 2025 |
| Mito Laboratories Ltd | Professional & scientific | 2026 |
| Miton UK Microcap Trust PLC | Financial services | 2015 |
| Mitown Ltd. | Wholesale & retail | 2017 |
| Mitre Restaurant Limited | Hospitality | 2015 |
| Mitre Roofing Group 1 Ltd | Construction | 2025 |
| Mitu Trans Ltd | Transport & logistics | 2019 |
| Mity’S Kitchen Ltd | Hospitality | 2024 |
| Miveh Ltd | Manufacturing | 2026 |
| MIX Plate Ltd | Extraterritorial | 2018 |
| Mixed Developments Ltd | Construction | 2021 |
| Mixi Property Holdings Ltd | Real estate | 2026 |
| Miya Plastering Ltd | Construction | 2023 |
| Mizen Estates Limited | Real estate | 2021 |
| Mizo Associates Limited | Information & communication | 2026 |
| Mizule Property Ltd | Real estate | 2020 |
| MJ and RD Russell Limited | Agriculture & fishing | 2013 |
| MJ Bedford Developments Ltd | Construction | 2023 |
| MJ Bristol Foods Ltd | Wholesale & retail | 2023 |
| MJ Decorating Ltd | Construction | 2023 |
| MJ Electrical and Renewables Limited | Construction | 2015 |
| MJ Events Bristol Ltd | Other services | 2024 |
| MJ Flooring Bristol Ltd | Wholesale & retail | 2022 |
| MJ Holdings Limited | Professional & scientific | 2017 |
| MJ Lewis Medical Limited | Health & social care | 2025 |
| MJ O'Brien Consulting Ltd | Professional & scientific | 2021 |
| MJ Orourke Limited | Professional & scientific | 2024 |
| MJ Parker Project Management Ltd | Construction | 2026 |
| MJ PMO Consulting Services Ltd | Professional & scientific | 2011 |
| MJ Props Ltd | Arts & recreation | 2021 |
| MJ Rimington Ltd | Professional & scientific | 2022 |
| MJ Tomes Roofing Services Ltd | Construction | 2015 |
| Mj's Plumbing Ltd | Construction | 2023 |
| MJ76 Holdings Ltd | Financial services | 2024 |
| MJA Bristol Ltd | Construction | 2023 |