| Metmix LimitedUnited Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1990 |
| Mevalco LtdBristol, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2007 |
| Mewine LimitedLondon, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Mi Doudou LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Mi-Flues LimitedBlackpool, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1996 |
| Michael A. Newman & Co LimitedBirmingham, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Michael Caines LimitedExmouth, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2003 |
| Michael Sutton's Cellar LimitedDartmouth, United Kingdom · UKmichaelsuttonscellar.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 2015 |
| Michel Roux LimitedBray, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1984 |
| Michelangelo Wines LimitedBarnet, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Microsoft LimitedReading, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1982 |
| Mid Atlantic Productions LtdPyrford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1987 |
| Midas Afi LimitedBournemouth, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Middleton Associates LtdOldham, United Kingdom · UKmiddletonassociates.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 1995 |
| Midwest Machinery LtdLancs, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2012 |
| Milestone LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2003 |
| Milestone Wines LtdClitheroe, United Kingdom · UKmilestonewines.co.uk · checked 1 Nov 2026 | UK | 0 | – | – | –Mid (producers) | 8% | 2014 |
| Millbank Financial Services LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1986 |
| Millbray Contracts LimitedWoodford Green, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2005 |
| Mille Gusti LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2005 |
| Millennium Cash & Carry LtdIlford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1999 |
| Millers Farmshop LimitedAxminster, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2006 |
| Millesima LtdLondon, United Kingdom · UKmillesima.com · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 1998 |
| Millesimes SASUnited Kingdom · UKmillesimes.com · checked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Mills & Reeve LLPLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2007 |
| Milton Sandford Wines LimitedReading, United Kingdom · UKmiltonsandfordwines.com · checked 28 Oct 2026 | UK | 0 | – | – | –Mid (producers) | – | 2006 |
| Mina Farms LimitedLondon, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Mindshare Media UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1997 |
| Ministry of Wine LtdLondon, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| MirabeauGambetta, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Miratoni LtdFeltham, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2010 |
| Mirbel LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2009 |
| Mischief and Mayhem Wines UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2022 |
| Mission Bay LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2011 |
| Mission Express LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1998 |
| Mitchell Potatoes LtdRugby, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1980 |
| Mj Wine Cellars LimitedLeighton Buzzard, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Mjlm LtdOxfordshire, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2002 |
| Mjmk Restaurants LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Mk Wine Art LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2014 |
| Mm Grocery LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| Modal Wines LimitedLondon, United Kingdom · UKmodalwines.com · checked 1 Nov 2026 | UK | 0 | – | – | –Mid (producers) | 35% | 2020 |
| Model Farm Shop Ltd.Bradford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2012 |
| Modern Contradiction LimitedShrewsbury, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2017 |
| Moet Hennessy U.k LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1941 |
| Moguntia Food LimitedMarket Harborough, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2009 |
| Moke Fine Wines LtdCirencester, United Kingdom · UKmokefinewines.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 2010 |
| Molb UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2015 |
| Molson Coors Brewing Company LimitedBurton upon Trent, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1888 |
| Momentum Services LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1999 |