| Mcconchie Partnership Ltd | Castle Douglas | 2021 |
| Mcconnachie Land & Forestry Services Ltd | Inverurie | 2018 |
| Mcconnell Farms Ltd | Melton Mowbray | 2025 |
| Mccormick Farms Ltd | Enniskillen | 2010 |
| Mccormick Harvesting Services Limited | Maybole | 2016 |
| Mccourt Stables Limited | Oswestry | 2022 |
| Mccrabbe Farms Ltd | Strabane | 2023 |
| Mccracken Farms Ltd | Banbridge | 2015 |
| Mccrea Bros Limited | Londonderry | 2026 |
| Mccreesh Farming Limited | Newry | 2014 |
| Mccreight Potatoes Limited | Rathfriland | 2013 |
| Mccrindleston Farm (Girvan) Limited | | 1964 |
| Mccrory Poultry Farms Ltd | Dungannon | 2011 |
| Mccubbing Timber Harvesting Limited | Dumfries | 2012 |
| Mccune Smith Limited | Isle Of Iona | 2013 |
| Mccurdys Potatoes Limited | Bushmills | 2012 |
| MCD Industries Limited | Ayr | 2009 |
| Mcdermotts (Meols) Limited | Wirral | 1950 |
| Mcdonald Agri Limited | Arbroath | 1995 |
| Mcdonald Developments (NI) Ltd | Armagh | 2013 |
| Mcdonald Farm Services Limited | Abingdon | 2011 |
| Mcdonald Harvesting Ltd | Omagh | 2015 |
| Mcelhatton Poultry Ltd | Co Tyrone | 2006 |
| Mcelroy Limited | Wishaw | 2024 |
| Mcentee Agri Limited | Dumfries | 2024 |
| Mcewan Contractors Limited | Northwich | 2007 |
| Mcewan Livestock Limited | Forfar | 2022 |
| MCF E&B Group Ltd | Kidwelly | 2022 |
| MCF Tree Services Limited | London | 2025 |
| Mcfaddens Equine Ltd | Bathgate | 2018 |
| Mcfagan Ltd | Eastbourne | 2008 |
| Mcfarland Arrochar Ltd | Tarporley | 2023 |
| Mcfarland Contractors Limited | Lincolnshire | 2007 |
| Mcfarland Farming Enterprises Limited | Nr Much Wenlock | 1989 |
| Mcfo (Yorkshire) Limited | Thirsk | 2015 |
| Mcgovern Budgies Limited | Liverpool | 2026 |
| Mcgovern Contracts Ltd | Clogher | 2023 |
| Mcgrade Farms Ltd | Omagh | 2023 |
| Mcgrane Nurseries Ltd | Co. Armagh | 2001 |
| Mcgregor Farms (Coldstream) Limited | Berwickshire | 1976 |
| Mcgregor Livestock Ltd | Kinross | 2023 |
| Mcgregor Maintenance Ltd | London | 2024 |
| Mcguckian Brothers Ltd | Ballymoney | 2017 |
| Mcguirk Fishing Ltd | Maryport | 2004 |
| Mcilroy Farms Limited | Coleraine | 2016 |
| Mcilwraith Contracts Ltd | Ayr | 2022 |
| Mcintosh Asset Management Limited | Dundee | 1984 |
| Mcintosh Farms Ltd | Princes Risborough | 2022 |
| Mcintosh Forestry Limited | Westhill | 2017 |
| Mcintosh Marine Limited | Lerwick | 2023 |
| Mcintyre Fruit Ltd | Blairgowrie | 2005 |
| Mciver Contracting Limited | Dingwall | 2011 |
| Mcivor EGG Farms Ltd | Dungannon | 2014 |
| MCK Forestry Limited | Dumfries | 2015 |
| Mckay & Pocock Ltd | Bridgwater | 2025 |
| Mckay's Fruit Farm (Robertsbridge) Limited | Robertsbridge | 1964 |
| Mckee Enterprises Limited | Norwich | 2010 |
| Mckee's Tree Services Ltd | Newtownards | 2025 |
| Mckeever Forestry Limited | Limavady | 1983 |
| Mckellars of Ayrshire Limited | Newmilns | 2021 |
| Mckelvey Agri Limited | Ballynahinch | 2026 |
| Mckenna (Omagh) Limited | Omagh | 2018 |
| Mckenna Agri Contracts Ltd | Omagh | 2020 |
| Mckenzie Brothers Limited | Alton | 2003 |
| Mckenzie Craiglands Ltd. | Inverness | 2011 |
| Mckenzie North Ltd | Elgin | 2025 |
| Mckeown Holdings Ltd. | Dungannon | 2016 |
| Mckerr Farming Ltd | Forth | 2018 |
| Mckerrow Bros Ltd. | Aberdeenshire | 2026 |
| Mckerrow Farming Ltd | Buxton | 2022 |
| Mckie Farming Ltd | Wimborne | 2025 |
| Mckill Maxwell & Company Limited | Thornhill | 1950 |
| Mckinney Holdings Limited | Cupar | 2021 |
| Mcknight's Forestry & Landscaping Ltd | Ruthin | 2023 |
| Mclaren Agricultural Limited | Inverurie | 2018 |
| Mclaren Growers Limited | Fife | 2006 |
| Mclaren Precision Agriculture Ltd | London | 2026 |
| Mclaughlin & Ling Reforestation Limited | North Shields | 2020 |
| Mclean & Sons Ltd | Shaftesbury | 2009 |
| Mcleish Environmental Ltd | Birmingham | 2019 |
| Mcleod Trawlers Limited | Brixham | 1997 |
| Mclernon Equine Limited | Abingdon | 2024 |
| Mclernon Poultry Ltd | Antrim | 2009 |
| MCM Agri & Plant Ltd | Newry | 2025 |
| MCM Farm Services Limited | Bridlington | 2004 |
| Mcmahon Agri Services Ltd | Enniskillen | 2020 |
| Mcmath Limited | Wigan | 2007 |
| Mcmiken Eggs Ltd | Castle Douglas | 2025 |
| Mcmullan Fishing Company Ltd | Newtownards | 2007 |
| Mcnamara & SON Limited | Barnstaple | 2006 |
| Mcnaughton Fencing and Dyking Limited | Dunoon | 1992 |
| Mcneice Fruit Farm Limited | Armagh | 2017 |
| Mcneice Holdings Limited | Inveran | 2026 |
| Mcneile Bloodstock Ltd | Cheltenham | 2026 |
| Mcneill Estates | Newton Stewart | 1947 |
| Mcneill Poultry Services Ltd | Dyan | 2021 |
| Mcneill Vineyard Management Limited | Billericay | 2011 |
| Mcphee's Goat Company Ltd | Penrith | 2019 |
| Mcquarrie Forestry Limited | Dalbeattie | 2014 |
| Mcqueen & Pearson Ltd | Brough | 2025 |