| MM Building & Plumbing Ltd | Construction | 2026 |
| MM Chauffeur Ltd | Transport & logistics | 2024 |
| MM Films Limited | Information & communication | 2011 |
| MM Intelligent Design Solutions Limited | Professional & scientific | 2016 |
| MM Land and Property Ltd | Real estate | 2022 |
| MM Pursuits Ltd | Professional & scientific | 2025 |
| MM Social Media Limited | Information & communication | 2024 |
| MM Southwest Ltd | Construction | 2019 |
| MMA Apparel Ltd | Wholesale & retail | 2009 |
| MMA Bristol Ltd | Hospitality | 2022 |
| MMA Event Productions Limited | Professional & scientific | 2024 |
| MMA Gym KIT Ltd | Wholesale & retail | 2017 |
| MMI Consultancy Limited | Administrative & support | 2005 |
| Mmiracle Limited | Health & social care | 2025 |
| Mmkclothing Limited | Construction | 2025 |
| MMM Delivery Ltd | Transport & logistics | 2019 |
| MMM Foods Ltd | Hospitality | 2023 |
| MMP Bristol Ltd | Manufacturing | 2006 |
| Mmsavs Limited | Professional & scientific | 2017 |
| Mmtv Ltd | Administrative & support | 2024 |
| MN Pro Properties Ltd | Real estate | 2025 |
| MN Wrought Iron Limited | Manufacturing | 2019 |
| MNC Healthcare Services Ltd | Health & social care | 2015 |
| MND Advanced Tech Support Ltd | Manufacturing | 2024 |
| Mnga Holdings Limited | Hospitality | 2024 |
| MNH Developments Ltd | Construction | 2014 |
| MNI Associates Ltd | Real estate | 2024 |
| MNI Bristol Ltd | Hospitality | 2022 |
| Mnkg Limited | Health & social care | 2025 |
| Mnky Ltd | Information & communication | 2020 |
| MNM Electrical Services Ltd | Other services | 2017 |
| Mnmv Limited | Financial services | 2023 |
| Mnmv Travelodge Limited | Hospitality | 2024 |
| Mnmv Yate Limited | Hospitality | 2024 |
| Mnts Construction Ltd | Construction | 2019 |
| MO Farah Property Limited | Real estate | 2025 |
| MO Removals Ltd | Transport & logistics | 2021 |
| MO Seafood and Fresh Fruits Ltd | Wholesale & retail | 2023 |
| Mo-Collective Ltd | Wholesale & retail | 2023 |
| Moai Group Limited | Professional & scientific | 2024 |
| Moatside Ventures Limited | Professional & scientific | 2002 |
| Moay Ltd | Wholesale & retail | 2024 |
| Moayedi Capital Ltd | Financial services | 2026 |
| MOB Electrical Ltd | Construction | 2024 |
| MOBA3 Limited | Information & communication | 2022 |
| Mobel Design Ltd | Manufacturing | 2025 |
| Mobil Limited | Real estate | 2008 |
| Mobile Club Catering Limited | Hospitality | 2023 |
| Mobile Communication Contractors Limited | Information & communication | 1995 |
| Mobile Fleet Services Limited | Wholesale & retail | 2010 |
| Mobile Fleet Shine Ltd | Other services | 2019 |
| Mobile Forklift Services Limited | Wholesale & retail | 2021 |
| Mobile Guru (UK) Ltd | Wholesale & retail | 2010 |
| Mobile Life Consulting Ltd | Information & communication | 2002 |
| Mobile Limited | Wholesale & retail | 2025 |
| Mobile Minds Engineering Ltd | Information & communication | 2018 |
| Mobile Patrol Bristol Limited | Administrative & support | 2018 |
| Mobile PIE Limited | Information & communication | 2005 |
| Mobile Plumbers Limited | Construction | 2006 |
| Mobile Power Cleaning Limited | Other services | 2020 |
| Mobile Surface Restoration Ltd | Administrative & support | 2026 |
| Mobile Tech Bristol Ltd | Other services | 2025 |
| Mobile Working Solutions Limited | Information & communication | 2013 |
| MOBILEMOVERS247 Limited | Transport & logistics | 2024 |
| Mobileworks Limited | Information & communication | 2005 |
| Mobitech Mechanics Ltd | Wholesale & retail | 2016 |
| Mobius Construct Limited | Construction | 2020 |
| Mobius Group Holdings Limited | Financial services | 2023 |
| Mobius Works Ltd | Construction | 2017 |
| Mobivision Ltd | Wholesale & retail | 2021 |
| Mobyclothing Limited | Extraterritorial | 2016 |
| Moca Energy Ltd | Information & communication | 2024 |
| Mocean Adventures Limited | Information & communication | 2014 |
| Mochamocha Franchising Limited | Administrative & support | 2026 |
| Mochamocha Limited | Hospitality | 2024 |
| Mochi Pops Limited | Manufacturing | 2020 |
| Mockridge Bespoke Carpentry Ltd | Construction | 2019 |
| MOD & Heal Ltd | Construction | 2016 |
| Moda Hairdressing (Bristol) Limited | Other services | 2013 |
| Moda Hotel & Resort Management Ltd | Professional & scientific | 2009 |
| Moda JIU Jitsu Academy Ltd | Education | 2025 |
| Modam IT Solutions Ltd | Information & communication | 2012 |
| Modcon Cabin Trader Ltd | Other services | 2017 |
| MODE50 Talent Solutions Ltd | Administrative & support | 2026 |
| Modelu Ltd | Manufacturing | 2022 |
| Modern Baking Systems (Bristol) Limited | Manufacturing | 1984 |
| Modern Estate Visuals Ltd | Professional & scientific | 2025 |
| Modern Glass (Bristol) Limited | Construction | 1979 |
| Modern Living Estate Ltd | Real estate | 2019 |
| Modern Media Limited | Information & communication | 2010 |
| Modern Publishing Limited | Manufacturing | 2003 |
| Modern Pumps Ltd | Extraterritorial | 2014 |
| Modern Queers Ltd | Information & communication | 2023 |
| Modern Scaffolding and Inspection Services Limited | Construction | 2024 |
| Modern Surfaces Online Limited | Wholesale & retail | 2026 |
| Modern Tender Limited | Information & communication | 2023 |
| Modern Works Limited | Professional & scientific | 2018 |
| Moderna Art Galleries Limited | Arts & recreation | 2007 |
| Modernflex Ltd | Information & communication | 2025 |
| Modernise UK Limited | Professional & scientific | 2000 |