| Moyns Park Estate Limited | Haverhill | 2007 |
| Moyo Fresh Farm Supplies Ltd | Barnsley | 2019 |
| Moyola Eggs Ltd | Magherafelt | 2025 |
| Moyola Farm Ltd | Maghera | 2014 |
| Moyrin Farms Ltd | Banbridge | 2015 |
| Moyse Foods Ltd | Bristol | 2026 |
| MP Forestry Ltd | Wisbech | 2025 |
| MP Poultry Limited | Dungannon | 2014 |
| MPB Bioproducts Limited | Gainsborough | 2007 |
| MPB Contracts Ltd | Ormskirk | 2015 |
| MPC Farriers Ltd | Malvern | 2023 |
| MPC Trading Ltd | Craigavon | 2019 |
| Mpcontractor Scotland Ltd | Perth | 2025 |
| MPF Horse Talent Ltd | Crook | 2012 |
| MPF Stables Ltd | Gillingham | 2016 |
| MPJ Staddon Limited | Holsworthy | 2006 |
| MPS Facility Services Limited | Eastleigh | 2015 |
| MPVETERINARYSERVICES2024 Ltd | Barnsley | 2024 |
| MPW Learning Limited | Bramley | 2007 |
| MQ Pharm Ltd | Feltham | 2022 |
| MR & AS Challinor Ltd | Stoke On Trent | 2003 |
| MR & JL Ritchie Ltd | Dunmow | 2020 |
| MR and MRS Making IT Happen Ltd | New Milton | 2020 |
| MR B'S Trees Ltd | Crawley | 2026 |
| MR Calvin Stroud Ltd | London | 2021 |
| MR David P C Ltd | Redruth | 2025 |
| MR F G, MRS N K and MR a J Gammon Limited | Taunton | 2013 |
| MR Macgregor's Garden Ltd | Norwich | 2025 |
| MR UK Bulls Limited | Leighton Buzzard | 2019 |
| MR Wheeler Limited | Maldon | 2014 |
| Mr&Mrs Paws Limited | Widnes | 2020 |
| MR. Logs Limited | Market Drayton | 2021 |
| MR. Tree Services Ltd | Stockton-On-Tees | 2009 |
| MR. Woofward & Co. Ltd | Sheerness | 2021 |
| MRA Forestry & Cattle Ltd | Cwmbach | 2026 |
| Mrar Farming Limited | Slough | 2023 |
| MRB Agri Ltd | London | 2007 |
| MRB Fishing Limited | Hayle | 2026 |
| MRC Forestry Limited | Hexham | 2025 |
| Mrc-Agri Ltd | Richmond | 2022 |
| MRD Farming Services Limited | Salisbury | 2025 |
| MRG Agri Construction Ltd | Dumfries | 2019 |
| MRG, EJ, JRM & CC Scott Limited | Somerset | 2005 |
| MRH Agri Limited | Melton Mowbray | 2012 |
| MRK MCB Ltd | Shetland | 2019 |
| MRL Vegetable Seeds Ltd | Preston | 2026 |
| MRR Agri Services Ltd | Montrose | 2024 |
| MRR Vegetable Agronomy Limited | Driffield | 2003 |
| MRS Charltons Farm Ltd | Newcastle Upon Tyne | 2023 |
| MRS J & J G Gill & SON Limited | Co Durham | 2006 |
| MRS Kirkhams Lancashire Cheese Limited | Preston | 2004 |
| MRS L.J. Doggrell Limited | Nr Sherborne | 1995 |
| MRS Margaret Mary Dixon Ltd | Liverpool | 2014 |
| MS Crabb Limited | Sherborne | 2003 |
| MS Dolittle Pet Sitting Services Ltd | Manchester | 2017 |
| MS Hunter Farming Ltd | Bridlington | 2021 |
| Msaratuae Ltd | London | 2024 |
| Msarb Limited | Pontypridd | 2020 |
| MSD Pest Control Ltd | Derby | 2023 |
| MSG Caines Agricultural Contractors Ltd | Bruton | 2021 |
| MSK Groundworks and Agricultural Services Limited | Oldham | 2018 |
| MSS Engineering Ltd | Fraserburgh | 2018 |
| MSV Country Life Limited | Buckingham | 2019 |
| MSW Farming Limited | Middlesbrough | 2020 |
| Msymba International Groupe Ltd. | London | 2019 |
| MT Cleaners Ltd | Edinburgh | 2024 |
| MT Equestrian Services Ltd | Exeter | 2022 |
| MT Trails Limited | Lanark | 2025 |
| MTB Group Ltd | Birmingham | 2022 |
| MTC Landcare Services Ltd | Eastleigh | 2020 |
| Mtek Services Ltd | Lerwick | 2023 |
| MTM Contracting Limited | Tenbury Wells | 2011 |
| MTM Fieldsports Ltd | Tadcaster | 2024 |
| MTN Farming Limited | Whitchurch | 2019 |
| Much Hadham Investments Ltd | Sawbridgeworth | 2022 |
| Much Hadham Landscapes Limited | Sawbridgeworth | 2002 |
| Muchshrooms Limited | London | 2025 |
| Muckairn Estate Limited | Aston Clinton | 2012 |
| Muckairn Mussels Limited | Oban | 1993 |
| Muckmasters Limited | North Chailey | 2000 |
| Mucky Pups Dog Grooming Ltd | Walsall | 2026 |
| MUD & Moos CIC | Northampton | 2024 |
| Mudariholdings Ltd | Nottingham | 2026 |
| Muddipuddle Farm Limited | Barnstaple | 2017 |
| Muddsticks Limited | Southall | 2005 |
| Muddy Boots Farm Project Ltd | Nottingham | 2023 |
| Muddy Dog Care Ltd | Letchworth | 2024 |
| Muddy Mule Limited | Carterton | 2018 |
| Muddy Paws Dog Boarding Ltd | Halesowen | 2022 |
| Muddy Pups Dog Walking and Pet Service Ltd | Lydney | 2022 |
| Muddy Souls UK Ltd. | Driffield | 2012 |
| Muddy Waters Limited | Deeside | 2025 |
| Mudie & Troughton Farms Limited | Eye | 1964 |
| Muggleswick Estate Ltd | Horsham | 2005 |
| Mugosa Limited | West Molesey | 2011 |
| Muir Farming Limited | Stafford | 2011 |
| Muir Farrier Services Ltd | Highworth | 2015 |
| Muir of Pert Farms Limited | Angus | 1949 |
| Muirend Farming Company Limited | Kilmarnock | 1959 |
| Muirfield (Scotland) Ltd | Ellon | 2013 |