| Merrick & Company UK Limited | Welwyn Garden City | A rating |
| Merridale Medical Centre | Leicester | A rating |
| Merriman Grange Care Home | Worthing | A rating |
| Merriman Ltd | Leicester | A rating |
| Merry Kidz Childcare Limited | Manchester | A rating |
| Merry Poppets Nursery Ltd | Henlow | A rating |
| Merrycare Ltd T/A Merrifield House Care Home | Wootton | A rating |
| Merryfield Home Ltd | Witney | A rating |
| Merryhill Care Ltd | London | A rating |
| Merrywell Care ( Belmont Grange)Ltd | Durham City | A rating |
| Merrywood Education Ltd | Tadworth | A rating |
| Mersen Holytown | Motherwell | A rating |
| Mersey and West Lancashire Teaching Hospitals NHS Trust | Prescot | A rating |
| Mersey Care NHS Trust | Liverpool | A rating |
| MERSEY CONVENIENCE STORE LTD T/A Cheapest Booze Express | Wallasey | A rating |
| Mersey Hospitality Ltd | Liverpool | A rating |
| Mersey shield ltd | Liverpool | A rating |
| MerseyCare Julie Ann Ltd | Liverpool | A rating |
| MERSEYSIDE TAMIL SCHOOL | LIVERPOOL | A rating |
| Merslaugh Farm Ltd | Stranraer | A rating |
| Merson Signs Ltd | Glasgow | A rating |
| Merstow Green Medical Practice | Evesham | A rating |
| Mert (GB) 3 Limited | London | A rating |
| MERTHYR PHONES | MERTHYR | A rating |
| Merthyr Tydfil 2006 Visionplus Limited | Mid Glamorgan | A rating |
| MERTON CARS LTD | Croydon | A rating |
| MERTON COLLEGE LONDON LTD | Walton-on-Thames | A rating |
| MERTON OFF-LICENCE LTD | London | A rating |
| Mertrux limited | Nottingham | A rating |
| Merve Denizalp Consultancy Ltd | London | A rating |
| Merviq Education Ltd | London | A rating |
| Mervyn Stewart Limited | Belfast | A rating |
| Merx Capital Ltd | London | A rating |
| Merx Solutions Ltd | London | A rating |
| Merxin Ltd | King's Lynn | A rating |
| Merz Aesthetics UK Limited | Hemel Hempstead | A rating |
| Merz Pharma UK Ltd | Hemel Hempstead | A rating |
| MES Financial Services Limited | Bath | A rating |
| Mesarete Capital LLP | London | A rating |
| Mesaroli UK Limited | Sandwich | A rating |
| MESC CONTRACTING UK LTD | Manchester | A rating |
| MESD LIMITED | LONDON | A rating |
| MESEME Studio LTD | London | A rating |
| MESH | London | A rating |
| MESH AI LIMITED | LONDON | A rating |
| Mesh Architects Ltd | Leeds | A rating |
| Mesh Energy | Farnham | A rating |
| Mesh Marketing Limited | Billingham | A rating |
| MESH Planning Tools LTD | London | A rating |
| Meshe Ltd | Manchester | A rating |
| Meshprime Technologies Ltd | London | A rating |
| Mesirow Financial International UK, Limited | London | A rating |
| Mesmerise Global Limited | London | A rating |
| Mesmerise Solutions UK Limited | London | A rating |
| Mesnes Road News | Wigan | A rating |
| MESOO DIGITAL LTD | London | A rating |
| MESOX LTD | Birmingham | A rating |
| message heard media ltd | london | A rating |
| Message House | Berkhamsted | A rating |
| MessageBird UK Limited | London | A rating |
| Messana Investments Limited | Ardglass | A rating |
| Messers Aldo Petrucci | Stranraer | A rating |
| Messiah Freight & Distributors UK Ltd. | London | A rating |
| MESSINGHAM TANDOORI LTD | Scunthorpe | A rating |
| Messrs Armstrong | Carlisle | A rating |
| MESSRS BHARDWAJ | Glasgow | A rating |
| Messrs Fisher | Carlisle | A rating |
| Messrs Jones | Llandovery | A rating |
| Messrs M, G & Mrs M Smyth | Ballymena | A rating |
| MESSRS MA & AA PATEL | EAST GRINSTEAD | A rating |
| MESSRS N & C D'ALLEN AND MRS C D'ALLEN T/A THE ORESTONE MANOR HOTEL | Devon | A rating |
| Messrs R McNeil Ltd | Stranraer | A rating |
| Messrs Randev t/a The Eagle Lodge | Glasgow | A rating |
| Messrs Rome | CANONBIE | A rating |
| Messrs S H Purdie Ltd | Stranraer | A rating |
| Messrs Turtle | Stranraer | A rating |
| Messrs William Forrest | Annan | A rating |
| Messums Wiltshire | Tisbury | A rating |
| Messy Chef Ltd. | Portsmouth | A rating |
| Mestag Therapeutics Limited | Cambridge | A rating |
| Mesuro Limited | Pencoed | A rating |
| MET DEVELOPMENT LONDON LTD | LONDON | A rating |
| Met Film School Ltd | London | A rating |
| Met foods ltd | erith | A rating |
| Met GeoEnvironmental Ltd | Leeds | A rating |
| Met Office | Exeter | A rating |
| MET T&S LIMITED | London | A rating |
| Met Traders Limited | London | A rating |
| Meta Data Systems Ltd | London | A rating |
| META HITECH KITCHEN EQUIPMENTS LIMITED | London | A rating |
| META HOSPITALITY LTD | London | A rating |
| Meta Innovative Solutions Ltd | London | A rating |
| META LOOP DESIGN LTD | London | A rating |
| Meta Solution Technologies Ltd | London | A rating |
| Meta Trend Fashion Limited | Salford | A rating |
| Metacell Limited | Cheltenham | A rating |
| Metacompliance Ltd | Derry | A rating |
| METAEDGE (UK) LIMITED | Pontprennau | A rating |
| Metaenterprices LTD | London | A rating |
| Metafan Co LTD | London | A rating |
| Metageni Limited | Guildford | A rating |
| Metagistics Freight Limited | London | A rating |
| METAHIVE LTD | London | A rating |
| Metal Agencies Limited | Byfleet | A rating |
| METAL ART ENGINEERING AND CONSTRUCTION LIMITED | London | A rating |
| Metal Assemblies Ltd | West Bromwich | A rating |
| Metal Inox Limited | Edgefield | A rating |
| Metal London Ltd | London | A rating |
| Metal Solutions Ltd | Bolton | A rating |
| Metal Yapi (UK) Limited | London | A rating |
| Metal Yapi Engineering (UK) Ltd | London | A rating |
| Metalchemy Limited | London | A rating |
| Metaldyne International (UK) Limited | Halifax | A rating |
| METALGIPS SYSTEM LIMITED | London | A rating |
| Metalink Recycling Limited | Reading | A rating |
| metalize | boston | A rating |
| Metallic Inc Ltd | London | A rating |
| Metallico Ltd | London | A rating |
| Metallisation Limited | Dudley | A rating |
| Metalock Engineering UK Limited | Coventry | A rating |
| Metalor Technologies (UK) Ltd | Birmingham | A rating |
| METALS FOCUS DATA LIMITED | London | A rating |
| Metals One PLC | London | A rating |
| MetalTech Roofing & Cladding Ltd | Coatbridge | A rating |
| METAMINDDYNAMICS LIMITED | London | A rating |
| METAPHOR TRADING LTD | LONDON | A rating |
| Metaphysic Limited | London | A rating |
| Metasonixx ltd | Brighton | A rating |
| Metasport Ltd | Sutton Coldfield | A rating |
| METAVERSE ACCOUNTING SERVICES LTD | Birmingham | A rating |
| Metaversegraph Labs (UK) Limited | London | A rating |
| Metaview Global Ltd | London | A rating |
| MetaVirology Ltd | London | A rating |
| METAVIZEN LTD | London, | A rating |
| Metcalfe Metal | HENLEY-ON-THAMES | A rating |
| Metcollect Limited | Lisburn | A rating |
| Metcraft (Lighting) Limited | Middleton | A rating |
| METEO365 LTD | Cardiff | A rating |
| Meteor Capital Group Limited | London | A rating |
| Meteor Communications (Europe) Ltd | Reading | A rating |
| Meteor Inkjet Limited | Harston | A rating |
| METEOR PROTECTION GROUP LTD | Luton | A rating |
| Meteor Rest Home | Westcliff-on-Sea | A rating |
| Meteor Rest Home Limited | Westcliff on sea | A rating |
| Meter Macs Limited | Basildon | A rating |
| Meter Mix Systems Ltd | Rushden | A rating |
| METEX TRADERS LTD | Edinburgh | A rating |
| METFINN LIMITED | DUNGANNON | A rating |
| Method Analytics Ltd t/a HyperFinity | Leeds | A rating |
| Method Apps Limited | Bath | A rating |
| Method Investments & Advisory Ltd | London | A rating |
| Method Music Limited | London | A rating |
| Methode Electronics UK Ltd | Burnley | A rating |
| Methodica Technologies Limited | Nottingham | A rating |
| Methodist Central Hall Coventry | Coventry | A rating |
| Methodist Church | London | A rating |
| Methodist Church in Ireland | Belfast | A rating |
| Methodist International Centre | LONDON | A rating |
| Methods Business and Digital Technology | London | A rating |
| Methusellah Limited T/A Yari Club | London | A rating |
| Methven UK Limited | Warrington | A rating |
| Meti Building Services Limited | Essex | A rating |
| METIA LTD | LONDON | A rating |
| Metica Trading Limited | London | A rating |
| Meticulous Ai Limited | London | A rating |
| Metier London Limited | London | A rating |
| Metis Consultants Limited | Richmond | A rating |
| Metis Consultants Ltd | Richmond | A rating |
| Metis Partners Limited | Glasgow | A rating |
| Metisplan Ltd | Crowthorne | A rating |
| METKA - EGN LIMITED | London | A rating |
| Metlen Energy & Metals S. A. UK Branch | London | A rating |
| MetLife Europe Services Limited | Brighton | A rating |
| Metmix Ltd | London | A rating |
| Metomic | London | A rating |
| Metoro Ltd | London | A rating |
| MetPrint Limited | Leeds | A rating |
| Metra Surveying Ltd | London | A rating |
| Metrasens Limited | Malvern | A rating |
| MetraWeather (UK) Limited | Reading | A rating |
| METREA MANAGEMENT LIMITED | London | A rating |
| Metric Capital Partners LLP | London | A rating |
| Metric Gaming (UK) Ltd | London | A rating |
| Metric Group Ltd | Swindon | A rating |
| Metric Search Limited | Nottingham | A rating |
| METRIC SERVICES (LEICESTER) LIMITED | Leicester | A rating |
| Metricell Ltd | Horsham | A rating |
| Metrics Design Ltd | Henley-on-Thames | A rating |
| Metrics Retails Ltd | Radstock | A rating |
| MetricStream UK Limited | London | A rating |
| Metrikus | London | A rating |
| Metrikus Software Limited | London | A rating |
| Metrion Biosciences Limited | Great Abington, Cambridge | A rating |
| Metris Energy Ltd | London | A rating |
| MetrixLab UK Limited | LONDON | A rating |
| METRO BANK PLC | LONDON | A rating |
| Metro Build Midlands Ltd | Birmingham | A rating |
| Metro C23 Stores Ltd | Hull | A rating |
| Metro C24 Stores | Hull | A rating |
| METRO CARE UK LTD | Romford | A rating |