| Millenoki Ltd | Information & communication | 2010 |
| Miller & RIX Associates Limited | Professional & scientific | 2014 |
| Miller Developments (Norfolk) Ltd | Real estate | 2022 |
| Miller's Fitness Limited | Wholesale & retail | 2023 |
| Millican Consultancy Limited | Professional & scientific | 2025 |
| Millie Kelly Limited | Professional & scientific | 2021 |
| Millie Manders Ltd | Arts & recreation | 2013 |
| Millie MAY Limited | Other services | 2012 |
| Millie’S Flowers Ltd | Wholesale & retail | 2025 |
| Milligen Mcleod Contracting Limited | Agriculture & fishing | 2010 |
| Milligen Mcleod Homes Limited | Construction | 2020 |
| Millmoores Ltd | Financial services | 2022 |
| Millnet Limited | Administrative & support | 2023 |
| Millor Management Ltd | Real estate | 2022 |
| Mills & Reeve (Nominees) Limited | Extraterritorial | 1997 |
| Mills & Reeve Limited | Professional & scientific | 1988 |
| Mills & Reeve Services Limited | Administrative & support | 2009 |
| Mills & Reeve Trust Corporation Limited | Professional & scientific | 2005 |
| Mills Knight Limited | Real estate | 2012 |
| Millside Place Residents Association (Isleworth) Limited | Households | 1986 |
| Milltech Precision Engineering Limited | Manufacturing | 1999 |
| Milltings Limited | Financial services | 2024 |
| Millview Estate Management Co Limited | Real estate | 2016 |
| Millview Properties Limited | Construction | 2003 |
| Milo Bedini Ltd | Information & communication | 2026 |
| MILO159 Ltd | Hospitality | 2019 |
| Milsome Arts & Publishing Limited | Wholesale & retail | 2021 |
| Milton Analyst Services Limited | Administrative & support | 2024 |
| Mimarcare Ltd | Health & social care | 2022 |
| Mimi Estates Limited | Hospitality | 2014 |
| Mimic Box Ltd | Manufacturing | 2025 |
| Mimis Daughters Ltd | Wholesale & retail | 2018 |
| Mimoco Property Holdings Ltd. | Real estate | 2012 |
| Mims Developments Ltd | Real estate | 2024 |
| Mimshach Management Services Ltd | Real estate | 2019 |
| Minara Enterprises Limited | Hospitality | 1996 |
| Minard Road Ltd | Professional & scientific | 2013 |
| Mincon Ltd | Real estate | 2024 |
| Mind Alike UK Ltd | Administrative & support | 2019 |
| Mind Associates Ltd | Professional & scientific | 2024 |
| Mind Your Own Business Ltd | Professional & scientific | 2026 |
| Mindful Family Ltd | Wholesale & retail | 2024 |
| Mindham Properties Limited | Real estate | 2024 |
| Mindhive Ltd | Information & communication | 2013 |
| Mindmerge Ltd | Administrative & support | 2016 |
| Mindoro Desserts Ltd | Hospitality | 2018 |
| Mindset Media Group Ltd | Information & communication | 2025 |
| Mindset Reset Limited | Other services | 2014 |
| Mindset-Hr Ltd | Administrative & support | 2022 |
| Mindtree Consultancy Limited | Professional & scientific | 2013 |
| Mindy’S Property GY Ltd | Real estate | 2025 |
| Minerva Advisory Group Limited | Administrative & support | 2007 |
| Minerva Training and Consultancy Ltd | Education | 2024 |
| Mini Grab Hire Limited | Extraterritorial | 2020 |
| Mini Maison Ltd | Wholesale & retail | 2015 |
| Mini Market Daily Fresh Ltd | Wholesale & retail | 2025 |
| Mini ME Clothing Ltd | Wholesale & retail | 2020 |
| Mini-Tanks Limited | Professional & scientific | 1999 |
| Miniature Donkeys for Wellbeing Ltd | Other services | 2017 |
| Minka Properties Ltd | Real estate | 2023 |
| Minnow Leisure Ltd | Education | 2023 |
| Minns Property Ltd | Real estate | 2020 |
| Minors & Brady Limited | Real estate | 2015 |
| Minors & Brady Properties Ltd | Real estate | 2021 |
| Minotaur CM Ltd | Construction | 2022 |
| Minoux Limited | Professional & scientific | 2021 |
| Mint Brand Consultancy Limited | Professional & scientific | 2015 |
| Mint Consult Limited | Professional & scientific | 2009 |
| Mint Consultancy Limited | Professional & scientific | 2012 |
| Mintech Semiconductors Limited | Extraterritorial | 2001 |
| Minter Property Management Limited | Extraterritorial | 2018 |
| Miraa Services Limited | Professional & scientific | 2017 |
| Mirage Creative Ltd | Arts & recreation | 2026 |
| Mirage Worldwide Productions Ltd | Arts & recreation | 2026 |
| Miran Barber Norwich Ltd | Other services | 2026 |
| Mirea Spedition Ltd | Transport & logistics | 2017 |
| Mirha Traders Ltd | Wholesale & retail | 2024 |
| Mirror Image (Norwich) Ltd. | Manufacturing | 2000 |
| Mirror Image Plastering Limited | Construction | 2015 |
| Mirror Labs Ltd | Information & communication | 2025 |
| Mirus Holdings UK Ltd | Financial services | 2024 |
| Mirusa Mortgages Ltd | Financial services | 2020 |
| Mishka Grooming Ltd | Other services | 2019 |
| Mishti GOR Ltd | Hospitality | 2025 |
| Miss Fluffy and Trixie-Belle Music Publishers Limited | Arts & recreation | 2021 |
| Missing Elephant Ltd | Professional & scientific | 2014 |
| Mist Fire Ltd | Construction | 2019 |
| Mist Foods (Midlands) Ltd | Hospitality | 2019 |
| Mister Fied Limited | Extraterritorial | 2002 |
| Mister G R Ltd | Other services | 2025 |
| Mister Pizza Ltd | Hospitality | 2020 |
| Misty Morning Property Ltd | Real estate | 2016 |
| Mitaa Limited | Hospitality | 2020 |
| Mitch's Recipes Ltd | Hospitality | 2020 |
| Mitchell Group EA Limited | Extraterritorial | 2007 |
| Mitchell Holdings (Norwich) Limited | Financial services | 2018 |
| Mitchell Marine Services Ltd | Professional & scientific | 2018 |
| Mitchell Piling Ltd | Construction | 2015 |
| Mitchell Property (Norwich) Limited | Real estate | 2018 |
| Mitchell Reclaim Ltd | Wholesale & retail | 2018 |