| Muirhead Farm (Scotland) Ltd | Newmilns | 2015 |
| Muirton Consultants Ltd | Laurencekirk | 2005 |
| Mulberry Contractors Limited | Emsworth | 2009 |
| Mulberry Cottage Cat Hotel Limited | Shropshire | 2023 |
| Mulberry Facilities Maintenance Limited | Leamington Spa | 2021 |
| Mulberry Projects Limited | Billingshurst | 2004 |
| Mulberry Tree Management Consultancy Limited | Bury | 2008 |
| Mulberry Tree Services Winchester Limited | Winchester | 2013 |
| Mulboy Farm Ltd | Dungannon | 2025 |
| Mulgrave Street Action Group Community Interest Company | Kington | 2021 |
| Mulholland (SH) Limited | London | 2020 |
| Muliebrity Airedale Terriers Limited | Tamworth | 2019 |
| Mulkeeragh Farms Ltd | Limavady | 2013 |
| Mull and Iona Community Trust | Isle Of Mull | 1997 |
| Mulladry Farm Eggs Ltd | Craigavon | 2023 |
| Mullaghmore Farms Limited | Caledon | 2010 |
| Mullaghmore Ltd | Fivemiletown | 2025 |
| Mullaghmore Milk Ltd | Dungannon | 2025 |
| Mullan Drilling Ltd | Crumlin | 2017 |
| Mullan Family Farm Ltd | Omagh | 2018 |
| Mullan Farms Ltd | Coleraine | 2026 |
| Mullan Poultry Ltd | Co Tyrone | 1999 |
| Mullawhinney Farm Ltd | Omagh | 2015 |
| Muller & Saunders Ltd | Maidstone | 2025 |
| Mulligan Poultry Ltd | Ballygawley | 2021 |
| Mullinmore Poultry Ltd | Carrickmore | 2014 |
| Mullintor Farms Limited | Caledon | 2022 |
| Mullybrannon Poultry Limited | Dungannon | 2025 |
| Mullyneil Poultry Ltd | Caledon | 2023 |
| Mulqueen Farriery and Consultancy Limited | Kenny Hill | 2012 |
| Multa Group Limited | Harpenden | 2021 |
| Multi Mite Ltd | Trowbridge | 2017 |
| Multi Point Constraint Ltd | Rugby | 2013 |
| Multi Roots Services Ltd | Nuneaton | 2016 |
| Multiflora Flowers Ltd | Wisbech | 2017 |
| Multimoon Limited | Peterborough | 2000 |
| Mulu Limited | Ludlow | 2002 |
| Mumbles Oyster Company Limited | Burry Port | 2012 |
| Munderfield Tea Company Limited | Bromyard | 2017 |
| Mundford Poultry Limited | Beccles | 1981 |
| Mundhi Limited | London | 2020 |
| Munkhamar Ltd | London | 2022 |
| Munks Agricultural Contractors Limited | Boston | 2021 |
| Munro Agricultural Consultancy Ltd | Haddington | 2024 |
| Munro Fencing & Forestry Ltd | Invergordon | 2018 |
| Munro Fishing Company Ltd | Thurso | 2017 |
| Munro Harvesting Limited | Dingwall | 2012 |
| Munro Landscape Ltd | Perth | 2011 |
| Munro Priesthill Ltd | Alness | 1978 |
| Munro West Highland Terriers Ltd | Glenrothes | 2021 |
| Munsgore Farm Stables Ltd | Sittingbourne | 2018 |
| Munslow Loft Pigeon Stud Ltd | Birmingham | 2019 |
| Muntham Home Farm Limited | Horsham | 2019 |
| Muntham Farm (Findon) Limited | Chichester | 1978 |
| Muntjactrading Ltd | Bromsgrove | 2008 |
| Murdoch Gardening Services Ltd. | Helensburgh | 2003 |
| Murdoch Sport Horses Ltd | Mayfield | 2021 |
| Murdoch Wood Ltd | Blairgowrie | 2022 |
| Mure Holdings Ltd | Orpington | 2025 |
| Murgitroyd Forestry Investments Ltd | Renfrew | 2020 |
| Murie Kennels Ltd | Glasgow | 2021 |
| Murleywell Farm Limited | Angus | 2024 |
| Murnlay Eggs Ltd | Dungannon | 2016 |
| Murphiehowe Farm Limited | Banchory | 2015 |
| Murphy Bros. (Farming) Limited | Newry | 1989 |
| Murphy Cattle NI Limited | Newry | 2025 |
| Murphy Farming Limited | Newry | 1996 |
| Murphys Tree Service Ltd | Newtownards | 2021 |
| Murray Agriculture Limited | Oswestry | 2022 |
| Murray Brothers Limited | Brechin | 2004 |
| Murray Deeside Marketing Limited | Aberdeenshire | 1986 |
| Murray Duguid Limited | Inverurie | 2003 |
| Murray Farms Limited | Telford | 2013 |
| Murray Forestry Ltd. | Perth | 2015 |
| Murray Grey Beef Cattle Society Limited | Crickhowell | 1985 |
| Murray Hall Farm Ltd | Bildeston | 2023 |
| Murrays Seed Cleaning Limited | Penrith | 2011 |
| Murt's Shellfish Limited | Padstow | 2020 |
| Murthly Fishings (Trustees) Limited | Perth | 1995 |
| Murton Farm Estate Limited | North Shields | 1944 |
| Murton Farm Ltd | Swansea | 2019 |
| Murton Grange Limited | York | 1997 |
| Musarum Limited | Saffron Walden | 2022 |
| Musgrove Willows Limited | Sherborne | 2010 |
| Mush Urban Farm Limited | London | 2026 |
| Mushi Mushi Limited | Guildford | 2026 |
| Mushill Farm Limited | Loughborough | 2022 |
| Mushrome Ltd | Bury St. Edmunds | 2025 |
| Mushroom Complex Ltd | Swadlincote | 2024 |
| Mushroom Producer Organisation Limited | York | 2016 |
| Mushroomery Ltd | Norwich | 2026 |
| Musker Limited | Porthmadog | 2002 |
| Musselwick Trading Co. Ltd | Haverfordwest | 2011 |
| Musson Contracting Limited | Cumnock | 2014 |
| Mustard Sheep Limited | Woodstock | 2017 |
| Musterfield Poultry Growers Ltd | Hexham | 2010 |
| Musuwo Fresh Farm Produce Ltd | Carshalton | 2026 |
| Mutapa Enterprises Ltd | Wigan | 2020 |
| Mutlins Doggy Day Care and Grooming Ltd | Durham | 2025 |
| Muttley’S Doggy Daycare Ltd | Poole | 2022 |