| MJP Environmental Ltd | Manchester | 2009 |
| MJP Recycling Limited | Brierley Hill | 2012 |
| MJR Auto Salvage Ltd | Cambridge | 2019 |
| MJS Fencing and Waste Removals Ltd | Wakefield | 2019 |
| MJS Recovery & SON (Scunthorpe) Ltd | Pinxton | 2019 |
| MJS Skip Hire Coventry Limited | Coventry | 2025 |
| MK Car Breakers Ltd | Edgware | 2024 |
| MK Drainage and Environmental Limited | Northampton | 2019 |
| MK Plant Hire Ltd | Leigh-On-Sea | 2018 |
| MK Pro Services Ltd | Aberdeen | 2023 |
| MK Recovering Solutions Ltd | Maidstone | 2021 |
| MK Waste Carriers Ltd | Batley | 2026 |
| MK Waste Management Ltd | South Shields | 2025 |
| MKB Earthworks Ltd | Walsall | 2018 |
| Mkdc Services Ltd | Peterborough | 2017 |
| MKI United Limited | London | 2025 |
| MKL Plastic Ltd | Ilford | 2025 |
| Mksquare Ltd | Rainham | 2021 |
| ML Chappory Ltd | Hitchin | 2026 |
| ML Eco Solutions Limited | Sutton | 2025 |
| ML Plant & Toilet Hire Limited | North East Lincolnshire | 1998 |
| ML1 Services Ltd | Glasgow | 2022 |
| Mlas Collections Ltd | Leeds | 2014 |
| MLE Recycling Limited | Stockport | 2003 |
| MLM Ltd | Manchester | 2005 |
| Mlogic Limited | Manchester | 2017 |
| MLS Waste Ltd | Newton Abbot | 2024 |
| MLT Environmental Services Ltd | Maidstone | 2018 |
| MM Rubbish Clearance Ltd | London | 2019 |
| MME Waste Management LDN Limited | London | 2021 |
| MMM94 Ltd | Maidstone | 2017 |
| Mmmb Construction Ltd | Winchester | 2023 |
| Mmrecycling CIC | Paisley | 2026 |
| Mmtt Limited | Doncaster | 2026 |
| MN Clothing Ltd | Kettering | 2015 |
| MN Garden Green Solutions Ltd | Hull | 2025 |
| MN Skip Company Ltd | Romford | 2026 |
| MNA & Sons Limited | Berkshire | 2007 |
| MNF Solutions Limited | Hereford | 2024 |
| MNS Waste Management Limited | Portsmouth | 2014 |
| MNT Plumbing and Drainage Limited | Horley | 2022 |
| MO Water Compliance Ltd | Huddersfield | 2018 |
| Mobel Technic Limited | Lancashire | 1981 |
| Mobile Compactor Services Limited | Polegate | 1998 |
| Mobile Soil Testing Ltd | Retford | 2024 |
| Mobile Tech Solutionn Ltd | Southall | 2020 |
| Mobile Toilet Services Ltd | Cannock | 2012 |
| Mobile Waste Management Ltd | Bromley | 2017 |
| Mobile Waste Recycling Ltd | Ilford | 2020 |
| Mobileoffer Limited | Bryn Road Tondu | 1990 |
| Mobiskip Ltd | Cardiff | 2020 |
| Mobius Energy Ltd | Barnet, Cockfosters | 2022 |
| Mobius Environmental Limited | Camberley | 2009 |
| Mobius Waste Management Ltd | Nottingham | 2024 |
| MOD Waste Management Ltd | Liverpool | 2022 |
| Model Features Limited | Solihull | 1952 |
| Modern Scrap Metals Ltd | London | 2020 |
| Modern Skips 2014 Limited | Southend-On-Sea, | 2014 |
| Modern Water Limited | Gateshead | 2006 |
| Modica Holdings Ltd | Cambridge | 2024 |
| Modivas Limited | Cambridge | 2025 |
| Modus Group Holdings Limited | London | 2026 |
| Modus Recycling C.I.C. | Grimsby | 2017 |
| Modus Site Services Limited | London | 2026 |
| Moeco Ltd | Montrose | 2025 |
| Moey Construction Ltd | Waterlooville | 2014 |
| Moffatt Engineering Limited | Malmesbury | 2004 |
| Mogridge Rosettes Limited | Bristol | 1987 |
| Mogsons Metals Limited | Salisbury | 2025 |
| Mogsonswaste Ltd | Salisbury | 2019 |
| Molehill Waste Clearance Limited | Bath | 2016 |
| Moling Experts Limited | Portsmouth | 2024 |
| Molloy Metals (L) Ltd | Armagh | 2018 |
| Molloy Metals Ltd | Co Armagh | 2008 |
| Molly's Car & Commercial Recycling Ltd | Rochester | 2015 |
| Moloney Stores Ltd | Birmingham | 2013 |
| Molstan Transport Ltd | Sleaford | 2017 |
| Monarch Bedrooms Limited | Manchester | 1978 |
| Monarch Hygiene Limited | Norwich | 2026 |
| Monarch International Solutions Ltd | Southampton | 2014 |
| Monarch Metals Limited | Oldham | 2005 |
| Monarch Metals Oldham Ltd | Oldham | 2025 |
| Mondofin UK Limited | Macclesfield | 2020 |
| Mondus Waste Management Limited | Dartford | 2020 |
| Monk Mind Disposal Ltd | Tunbridge Wells | 2025 |
| Monks Drain Services Limited | Blackburn | 2017 |
| Monmore Recycling Limited | Dudley | 2009 |
| Monolithic Environmental Services Limited | Skewen | 2004 |
| Monoworld Group PLC | Rushden | 2012 |
| Monoworld Limited | Rushden | 2000 |
| Monoworld Polymers Ltd | Northamptonshire | 2020 |
| Monoworld Recycling Ltd | Rushden | 2007 |
| Monster Grab Hire Ltd | Arundel | 2026 |
| Monster Junk Franchise Limited | Crewe | 2022 |
| Monster Junk Hatfield Ltd | Hatfield | 2023 |
| Monster Junk Limited | Crewe | 2021 |
| Monster Junk Wrexham Ltd | Chepstow | 2024 |
| Monster Skips Limited | Birmingham | 1999 |
| Monster-Removals Ltd | Gloucester | 2021 |
| Montague Waste Management Ltd | Iver | 2025 |