| Millies Motors Ltd | Wholesale & retail | 2024 |
| Milliners Guild Limited | Wholesale & retail | 2013 |
| Million Target Ltd. | Manufacturing | 2018 |
| Millpond Care Ltd | Health & social care | 2019 |
| Millpond Housing Ltd | Hospitality | 2020 |
| Mills Court Management Company Limited | Households | 2011 |
| Mills Entertainment Ltd | Arts & recreation | 2018 |
| Mills Property Solutions Limited | Real estate | 2018 |
| Millside Quay (Bristol) NO. 2 Management Limited | Households | 1993 |
| Millside Quay (Bristol) NO. 3 Management Limited | Households | 1993 |
| Millside Quay (Bristol) NO. 4 Management Limited | Households | 1994 |
| Millstone Green Management Company Limited | Households | 2014 |
| Millz Media Ltd | Wholesale & retail | 2026 |
| Milne Standen Financial Planning Ltd | Financial services | 2019 |
| Milo Rose Ltd | Arts & recreation | 2025 |
| Milos Health & Beauty Ltd | Wholesale & retail | 2025 |
| Milton House (Newton Abbot) RTM Company Limited | Households | 2014 |
| Milton Keynes Properties Limited | Construction | 1967 |
| Milton Pharmaceutical Company UK Limited | Manufacturing | 2001 |
| Milverton Education Limited | Education | 2023 |
| MIM Culture Limited | Hospitality | 2025 |
| Mimark Developments Limited | Real estate | 2004 |
| Mimi Bristol Ltd | Other services | 2023 |
| Mimi K Productions Ltd | Information & communication | 2014 |
| Mimi Mellow Ltd | Extraterritorial | 2021 |
| Mimi Yakigar Ltd | Health & social care | 2025 |
| Mimidae Ltd | Hospitality | 2018 |
| Mimishca Private Ltd | Real estate | 2021 |
| Mimko Ltd | Wholesale & retail | 2018 |
| MIN SOL Limited | Wholesale & retail | 2024 |
| Mina Road (Bristol) Estate Management Company Limited | Households | 2001 |
| Mina Xpress Limited | Transport & logistics | 2024 |
| Minahil Subhan Foods Ltd | Wholesale & retail | 2023 |
| Minara Stays Ltd | Hospitality | 2026 |
| Minari Impex LP | | 2012 |
| Mind Body Fitness Ltd | Other services | 2017 |
| Mind Chill Nootropics Limited | Wholesale & retail | 2015 |
| Mind Factory Ltd | Other services | 2025 |
| Mind Mixer Limited | Administrative & support | 2020 |
| Mind Relief 365 Ltd | Administrative & support | 2024 |
| Mind Revolution Ltd | Professional & scientific | 2018 |
| Mind the Move Limited | Administrative & support | 2026 |
| Mind YA Business Theatrics Ltd | Arts & recreation | 2025 |
| Mindflame Capital Ltd | Real estate | 2025 |
| Mindful Leaders Ltd | Professional & scientific | 2016 |
| Mindfulcare Ltd | Health & social care | 2014 |
| Mindfulness Connected Limited | Health & social care | 2016 |
| Mindload Ltd | Arts & recreation | 2019 |
| Mindlume Tech Ltd | Education | 2025 |
| Mindpower Breathwork Ltd | Professional & scientific | 2018 |
| Minds I Ltd | Professional & scientific | 2005 |
| Mindscape Therapies Ltd | Other services | 2018 |
| Mindset in Motion Ltd | Professional & scientific | 2022 |
| Mindset Marketing Consultancy Limited | Professional & scientific | 2009 |
| Mindset Practice Limited | Health & social care | 2017 |
| Mindset Research Limited | Professional & scientific | 2002 |
| Mindsets Group Ltd | Manufacturing | 2026 |
| Mindtend Ltd | Health & social care | 2025 |
| Mineral Resources Professional Limited | Public administration | 2013 |
| Miners Close Management Company Limited | Real estate | 2003 |
| Minerva Accountants Bristol and Somerset Limited | Professional & scientific | 2017 |
| Minerva Technology Limited | Information & communication | 2024 |
| Mines & Quarries Consultancy Ltd | Administrative & support | 2015 |
| Mines Corporation Ltd | Households | 2020 |
| Minestar Limited | | 1983 |
| Ming & Shen Limited | Hospitality | 2020 |
| Ming Dynasty Ltd | Hospitality | 2018 |
| Minh Tien Ltd | Other services | 2023 |
| Mini Go Market Ltd | Wholesale & retail | 2025 |
| Mini Rocks Ltd | Hospitality | 2020 |
| Mini Roots Ltd | Wholesale & retail | 2026 |
| Mini-Meals Catering Limited | Hospitality | 2015 |
| Minidot Concepts Limited | Transport & logistics | 2025 |
| Minimal Barbering Hotwells Ltd | Other services | 2023 |
| Minimal Barbering Ltd | Other services | 2018 |
| Mining & Sustainable Development Ltd | Professional & scientific | 2018 |
| Mining Music Limited | Information & communication | 2016 |
| Minipump (UK) Ltd | Extraterritorial | 2006 |
| Miniso Ltd | Wholesale & retail | 2026 |
| Ministering Angels Ltd | Health & social care | 2010 |
| Ministry of Beauty Limited | Other services | 2016 |
| Ministry of Botany Ltd | Wholesale & retail | 2023 |
| Ministry of Fitness Ltd | Arts & recreation | 2007 |
| Ministry of Reggae Ltd | Arts & recreation | 2024 |
| Ministry of Software Limited | Information & communication | 2012 |
| Ministry of Time Ltd | Information & communication | 2011 |
| Minna Direct Ltd | Health & social care | 2025 |
| Minnow IT Ltd | Information & communication | 2012 |
| Minns Scientific Ltd | Information & communication | 2024 |
| Minns-Hill Properties Limited | Extraterritorial | 1962 |
| Minor to Major Ltd | Health & social care | 2017 |
| Minor Works Architects Ltd | Professional & scientific | 2022 |
| Minsterley Battery Storage Limited | Energy | 2023 |
| Minsz Ltd | Wholesale & retail | 2024 |
| Mint Accounts Ltd | Professional & scientific | 2026 |
| Mint Campers Ltd | Manufacturing | 2020 |
| Mint Health Clinic Ltd | Health & social care | 2023 |
| Mint Living Limited | Construction | 2013 |
| Mint Plants Limited | Wholesale & retail | 2022 |
| Mint Stays Ltd | Real estate | 2022 |