| Monastic Order LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2020 |
| Moncharm LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2007 |
| Mondial Wine LimitedRedhill, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1985 |
| Mondrian LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1998 |
| Monex Europe LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2006 |
| Monolith UK LtdDagenham, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2004 |
| Monopole Wine Portfolio Management LtdLondon, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Montague Fine & Rare Wines LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2009 |
| Montealegre Company LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2015 |
| Montesion LimitedRadstock, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2024 |
| Montres Journe London LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2023 |
| Monty Wines LtdBristol, United Kingdom · UKmontywines.co.uk · checked 1 Nov 2026 | UK | 0 | – | – | –Premium (producers) | 26% | 2006 |
| Monument Group Europe LLPLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2012 |
| Moonpig.com LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1999 |
| More Wine LtdHassocks, United Kingdom · UKmorewine.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 2018 |
| Moreira and Son LtdRoslin, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2018 |
| Moreno Wine Importers Company LimitedCheadle, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1988 |
| Morgan Classic Wines LimitedEast Sussex, United Kingdom · UKmorganclassicwines.com · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 1999 |
| Morgenrot Group PLCManchester, United Kingdom · UKmorgenrot.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | –Mid (producers) | 10% | 1970 |
| Morosini Mills LtdBradford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1977 |
| Morrish & Banham LtdUnited Kingdom · morrishandbanham.com · checked 1 Nov 2026 | | – | 27 | Italy, France, New ZealandCôtes de Thongue, Rías Baixas | –Mid (producers) | 4% | – |
| Mosimanns LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1987 |
| Moss Automotive Storage LtdHarrow, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2018 |
| Mossman Family Import Company LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2014 |
| Motan Colortronic LtdChesterfield, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2009 |
| Mother Farm LimitedLedbury, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Mother London LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2003 |
| Mount Street Caterers LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1959 |
| Mountain Valley LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2011 |
| Mr Drinks LtdLondon, United Kingdom · UKchecked 26 Oct 2026 | UK | 0 | – | – | – | – | – |
| Mr Lawrence Wine Merchants LtdBishop's Stortford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2002 |
| Mr Majestic Drinks LimitedBarking, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2023 |
| Msi-Moving Specialists Int. LtdBedford, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2011 |
| Muckle Brig LimitedEdinburgh, United Kingdom · UKmucklebrig.com · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 2014 |
| Multimarvel UK LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2024 |
| Mundus Wines LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1999 |
| Murassi Winery LtdSouth Croydon, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2023 |
| Murphy & Son LtdNottingham, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1909 |
| Murphy London Communications LtdChislehurst, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2020 |
| Museum Wines LtdSalisbury, United Kingdom · UKmuseumwines.co.uk · checked 1 Nov 2026 | UK | 0 | – | – | –Premium (producers) | 8% | 2006 |
| Musgrave Retail Partners Ni LimitedBelfast, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 1995 |
| Musicmann LtdWalsall, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2006 |
| Musigny LtdLondon, United Kingdom · UKmusigny.wine · checked 28 Oct 2026 | UK | 0 | – | – | –Fine (producers) | 28% | 2021 |
| Must & Lees LtdSheffield, United Kingdom · UKmustandlees.co.uk · checked 28 Oct 2026 | UK | 0 | – | – | – | – | 2021 |
| Must Wines LtdUnited Kingdom · mustwines.co.uk · checked 13 Oct 2026 | | – | 25 | New ZealandMarlborough, Central Otago | –Premium (producers) | 4% | – |
| Mutley Leisure LimitedChesterfield, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2021 |
| Mw Love Trading LtdHitchin, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2025 |
| Mxn Wines LtdFraserburgh, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2025 |
| My Blue Rose LimitedGodalming, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2019 |
| My Dewine LtdAmersham, United Kingdom · UKchecked 28 Oct 2026 | UK | 0 | – | – | – | – | 2021 |