| Michael Michelle Fashions Limited | Hospitality | 1972 |
| Michael Whitaker Fabrics Limited | Wholesale & retail | 1996 |
| Michalina Kulesza Ltd | Extraterritorial | 2024 |
| Michel Michel Ltd | Health & social care | 2011 |
| Michele Taylor Ltd | Professional & scientific | 2010 |
| Michele's Maids Ltd | Other services | 2008 |
| Michelle O'Shea & Co Limited | Professional & scientific | 2011 |
| Michelle Walters Property Limited | Real estate | 2025 |
| Michelson Diagnostics Ltd | Manufacturing | 2006 |
| Mick Fearn Mechanical & Electrical Services Ltd | Construction | 2020 |
| Mick Herbert Limited | Construction | 2003 |
| Mick's MOT Centres Ltd | Wholesale & retail | 2017 |
| Micklemeadow Ltd | Real estate | 2023 |
| Mickleover Partners Limited | Health & social care | 2001 |
| Mickmakjerkyattack Limited | Manufacturing | 2026 |
| Mico JR Limited | Information & communication | 2014 |
| Micra Consultancy and Resourcing Ltd | Professional & scientific | 2024 |
| Micro Advanced Technologies Ltd | Professional & scientific | 2026 |
| Micro-Mesh Engineering Limited | Manufacturing | 1968 |
| Microbotany Limited | Professional & scientific | 2023 |
| Microfinish & Co. Limited | Manufacturing | 2021 |
| Microgreens of Nottingham Ltd | Agriculture & fishing | 2024 |
| Microjet Precision Services Limited | Manufacturing | 2013 |
| Microlise Engineering Limited | Information & communication | 1988 |
| Microlise Group PLC | Financial services | 2018 |
| Microlise Limited | Manufacturing | 1995 |
| Micromix Plant Health Limited | Manufacturing | 2006 |
| Microroamers Ltd | Wholesale & retail | 2025 |
| Microscopics Limited | Arts & recreation | 2006 |
| Microtech Filters Limited | Manufacturing | 2011 |
| Microware Limited | Information & communication | 2017 |
| Mictech (Midlands) Ltd | Manufacturing | 2019 |
| Miculit Trans Ltd | Transport & logistics | 2019 |
| MID Access Ltd | Construction | 2021 |
| MID AF Technologies Ltd | Information & communication | 2023 |
| MID City Signage Ltd | Construction | 2016 |
| MID Civils Limited | Construction | 2020 |
| MID Telecommunication Ltd | Information & communication | 2012 |
| Mid-East Spares International Ltd | Wholesale & retail | 2002 |
| Mid-Link Solutions Ltd | Transport & logistics | 2022 |
| Mida Developments Limited | Real estate | 2022 |
| Midas Decorators Limited | Construction | 2003 |
| Midas NG Limited | Health & social care | 2019 |
| Midas Touch Milan Limited | Wholesale & retail | 2026 |
| Midas Touch Publishing Ltd | Professional & scientific | 2007 |
| Middle Lane Cafe Limited | Wholesale & retail | 2022 |
| Middle Lane Property Ltd | Real estate | 2020 |
| Middlebrook Developments Ltd | Construction | 2006 |
| Middlebrook Garage Limited | Wholesale & retail | 2004 |
| Middleby UK Residential Holding Ltd | Professional & scientific | 2015 |
| Middler Property Investments Ltd | Real estate | 2022 |
| Middleton (Worksop) Properties Limited | | 1962 |
| Middleton Composites Ltd | Manufacturing | 2025 |
| Middleton House Management Company Limited | Households | 2023 |
| Middleton Housing Ltd | Real estate | 2025 |
| Middleton Park Management Limited | Real estate | 2017 |
| Midfix (London) Ltd | Wholesale & retail | 2024 |
| Midfix Limited | Extraterritorial | 2004 |
| Midi Maisons UK Limited | Construction | 2019 |
| Midland Auto Services Ltd | Wholesale & retail | 2009 |
| Midland Building Services Ltd | Construction | 2009 |
| Midland Civils, Groundworks and Electrical Ltd | Construction | 2026 |
| Midland Data Recovery Ltd | Information & communication | 2021 |
| Midland Datacomms Limited | Information & communication | 2019 |
| Midland Doors & Loading Bay Systems Ltd | Manufacturing | 2023 |
| Midland Energy Ratings Limited | Administrative & support | 1998 |
| Midland Exclusive Travel Limited | Transport & logistics | 2024 |
| Midland Farm Services Limited | Administrative & support | 1998 |
| Midland Filtration Limited | Manufacturing | 1985 |
| Midland Fire Stopping Limited | Construction | 2023 |
| Midland Fixings Group Ltd | Professional & scientific | 2015 |
| Midland Fixings Ltd | Wholesale & retail | 2015 |
| Midland Fulfilment Hub Limited | Wholesale & retail | 2023 |
| Midland Furniture & Carpets Limited | Wholesale & retail | 2023 |
| Midland Hockey Youth Support Ltd | Arts & recreation | 2020 |
| Midland Holdings Private Ltd | Wholesale & retail | 2022 |
| Midland Improvements Nottingham Ltd | Construction | 2024 |
| Midland Innovation Ltd | Health & social care | 2019 |
| Midland Joinery Limited | Wholesale & retail | 1921 |
| Midland Kebab Notts Ltd | Hospitality | 2026 |
| Midland Land and Investments Ltd | Real estate | 2020 |
| Midland Mandaps Ltd | Other services | 2011 |
| Midland Media Services Ltd | Information & communication | 2019 |
| Midland Metal Windows Limited | Manufacturing | 2012 |
| Midland MOT Services Ltd | Wholesale & retail | 2025 |
| Midland Paper Trading Limited | Wholesale & retail | 2025 |
| Midland Precision Engineering Limited | Manufacturing | 2006 |
| Midland Property and Building Services Limited | Other services | 2012 |
| Midland Regional Printers (Holdings) Limited | Financial services | 2024 |
| Midland Regional Printers (Property) Limited | Real estate | 2024 |
| Midland Regional Printers Limited | Manufacturing | 1969 |
| Midland Reprographics Limited | Wholesale & retail | 1991 |
| Midland Roofing Ltd | Construction | 2022 |
| Midland Stairlifts Limited | Wholesale & retail | 2002 |
| Midland Taxis Ltd | Transport & logistics | 2024 |
| Midland Team Limited | Real estate | 2020 |
| Midland Transport Solutions Ltd | Transport & logistics | 2025 |
| Midland Vectis Ltd. | Transport & logistics | 2019 |
| Midlandpark Ltd | Wholesale & retail | 2025 |
| Midlands Academy of Dance & Drama Limited | Arts & recreation | 1999 |