| MENORAH MIRIELLE LIMITED | Harrow | A rating |
| Menorca Private Owners Ltd | Ashbourne | A rating |
| Menpani Ltd t/as Loome Store | Winterton-On-Sea | A rating |
| Menras Limited | Harrow | A rating |
| MENSPIRE ANSTEY LIMITED | Anstey | A rating |
| Mental Health and Wellbeing Ltd | Shrewsbury | A rating |
| Mental Health Care (U.K) Limited | Denbigh | A rating |
| Mental Health Foundation | London | A rating |
| Mental Health Innovations | London | A rating |
| Mentat Technology Limited | Byfield | A rating |
| Mentaur Limited | Northampton | A rating |
| MENTEC LTD | Bolton | A rating |
| Mentfield Logistics (UK) Ltd | North Finchley | A rating |
| Mention Me Limited | London | A rating |
| MENTMORE CAPITAL PARTNERS LIMITED | London | A rating |
| MENTOR ACCOUNTING SERVICES LTD | SLOUGH | A rating |
| MENTOR ENGINEERING LTD | Teddington | A rating |
| Mentor IMC Ltd | London | A rating |
| MENTOR MERLIN UK LTD | NORTHAMPTON | A rating |
| Mentors Services Limited | Manchester | A rating |
| Menwell Limited | London | A rating |
| Menzies Aviation Holdings Ltd | Hounslow | A rating |
| Menzies LLP | London | A rating |
| MEO 2012 LIMITED | LONDON | A rating |
| Meo Foods Ltd | Dunstable | A rating |
| Meon Health Practice | Fareham | A rating |
| Meopham Tandoori Balti Ltd | Gravesend | A rating |
| Meopham Veterinary Hopsital | Meopham | A rating |
| Mep Measure Limited | Birkenhead | A rating |
| MEP SOLUTIONS UK. LTD | Solihull | A rating |
| Mepani Electrical Limited | Harrow | A rating |
| Mepco UK Limited | Hayes | A rating |
| MEPlace | London | A rating |
| Meplas Ltd | York | A rating |
| MEPS International Ltd | Sheffield | A rating |
| Mer Fleet Service Limited | Consett | A rating |
| MER MARINE TECHNOLOGIES LTD | London | A rating |
| MERABOILER GROUP LTD | London | A rating |
| Meraj Limited | Brentford | A rating |
| MERAJ POLYXT LTD (15445093) | Manchester | A rating |
| Meraki Art Studio Ltd | Dartford | A rating |
| Meraki Group Limited | Heckmondwike | A rating |
| Meraki Inc. International Limited | London | A rating |
| MERAKI THAI THERAPY LTD | Hounslow | A rating |
| Meraki Unique Care Ltd, T/A My Homecare Redbridge | Ilford | A rating |
| Merali Beedle | London | A rating |
| Merali's Chartered Accountants | Harrow | A rating |
| Merative UK Ltd | Preston | A rating |
| Merbani Grove Heating & Plumbing Ltd | Hounslow | A rating |
| MERBEE FOOD LIMITED | Aylesbury | A rating |
| Merc Education UK LTD | London | A rating |
| Mercado Central Ltd | Cambridge | A rating |
| Mercantile & Maritime UK Limited | London | A rating |
| Mercantile Trust Limited | Watford | A rating |
| Mercat Tours | EDINBURGH | A rating |
| Mercato Metropolitano Ltd | London | A rating |
| Mercator IT Solutions Ltd | Crowborough | A rating |
| Mercaux Limited | London | A rating |
| Mercedes AMG High Performance Powertrains Ltd | Northampton | A rating |
| Mercedes-Benz Cars UK Limited | Milton Keynes | A rating |
| Mercedes-Benz Financial Services UK Ltd | Milton Keynes | A rating |
| Mercedes-Benz Grand Prix Ltd | Brackley | A rating |
| Mercer & Hole | Rickmansworth | A rating |
| Mercer and Hughes Ltd | Saffron Walden | A rating |
| Mercer Engineering Ltd | Dereham | A rating |
| Mercer Lewin Ltd | Oxford | A rating |
| Mercer Ltd | London | A rating |
| Mercer Risk Management Limited | London | A rating |
| Merchandising For Life Limited | London | A rating |
| Merchant and Weaver | London | A rating |
| Merchant City Restaurants Ltd | Glasgow | A rating |
| Merchant Finance London Limited | Bristol | A rating |
| Merchant Hub Limited | London | A rating |
| Merchant Mackinlay Simpson Ltd TA Merchant & Co. | London | A rating |
| Merchant Money | London | A rating |
| Merchant saver ltd | London | A rating |
| Merchant Square Capital Ltd | London | A rating |
| Merchant Taylors' Oxfordshire Academy Trust | Wallingford | A rating |
| Merchant Taylors' School and prep School | Northwood | A rating |
| MerchantCantos | London | A rating |
| Merchanting Ltd | Tilbury | A rating |
| Merchants House Limited T/A Alchemilla Restaurant | Nottingham | A rating |
| Merchants News Ltd. Sponsor Licence | Redland | A rating |
| Merchiston Castle School | Edinburgh | A rating |
| Merchiston Surgery, part of Wyvern Health Partnership | Swindon | A rating |
| Merchr Limited | London | A rating |
| Mercia Asset Management PLC | Henley in Arden | A rating |
| Mercia Garden Products Ltd | Newark | A rating |
| Mercier Salon Limited | London | A rating |
| Mercium Ltd | London | A rating |
| Merck Life Science UK Limited | Gillingham | A rating |
| Merck Sharp & Dohme (UK) Limited | London | A rating |
| MERCMILE TRADING UK LTD | Ilford | A rating |
| MERCO CONSULTANCY LTD | Epsom | A rating |
| Mercor Innovations UK Ltd | London | A rating |
| Mercuna Developments Limited | Edinburgh | A rating |
| Mercur Solutions (UK) Ltd | Bracknell | A rating |
| Mercure Thame Lambert Hotel | Watlington | A rating |
| Mercuri Urval Limited | London | A rating |
| MERCURIA UK LLP | London | A rating |
| Mercurius IT Limited | Milton Keynes | A rating |
| Mercury Asia Limited | London | A rating |
| Mercury Capital (W12) LTD | Middlesex | A rating |
| MERCURY CARE SERVICES LIMITED | CROYDON | A rating |
| Mercury Computer Systems Limited | Reading | A rating |
| MERCURY DESIGN & TATTOO LTD | London | A rating |
| MERCURY DIGITAL ASSETS LIMITED | London | A rating |
| Mercury Engineering & Building Services Limited | London | A rating |
| Mercury Musical Developments | London | A rating |
| MERCURY RECYCLING LIMITED | MANCHESTER | A rating |
| MERCURY RESEARCH UK LIMITED | Bristol | A rating |
| Mercury Security and Facility Management | Lisburn | A rating |
| Mercury xRM Ltd | Coleshill | A rating |
| Mercy & Joy Specialist Dentistry Services Limited | Dundee | A rating |
| Mercy Corps Europe | Edinburgh | A rating |
| MERCY FOOD WINE LIMITED | Nottingham | A rating |
| Mercy Foundation CIO Al Manaar | Bradford | A rating |
| Mercy Gold Limited | Grays | A rating |
| MERCY HOME CARE SERVICES LIMITED | BASINGSTOKE | A rating |
| Mercy Ships - U.K. Limited | Stevenage | A rating |
| Mere Dental Practice | Mere | A rating |
| Meren Services Limited | London | A rating |
| Mereside Medical (Ely, Haddenham and Soham) | Ely | A rating |
| Merge Enterprise Ltd | Wakefield | A rating |
| Merge Games Ltd | Macclesfield | A rating |
| Merge Money Ltd | London | A rating |
| MERGEN IT LTD | Colchester | A rating |
| Mergermarket Limited t/a Acuris | London | A rating |
| MergeXR Studio Limited | Luton | A rating |
| Merging Rivers Grange Ltd. | Kingston Upon Thames | A rating |
| Mericrest Limited | London | A rating |
| MERIDALE STORE LTD | Wolverhampton | A rating |
| MERIDEN CATERING LIMITED | Birmingham | A rating |
| Meridian Audio Limited | Huntingdon | A rating |
| Meridian Business Support LTD | Threapwood Road | A rating |
| Meridian Carz Ltd | East Grinstead | A rating |
| Meridian Estates ( west midlands ltd ) | Birmingham | A rating |
| MERIDIAN FRUIT & VEG LIMITED | London | A rating |
| MERIDIAN GRAND LIMITED | London | A rating |
| Meridian Health & Social Care Limited | Wolverhampton | A rating |
| Meridian Hotels Ltd | Sittingbourne | A rating |
| Meridian Impact CIC | Cambridge | A rating |
| Meridian Investment Group Limited t/a Invicta Hotel | Plymouth | A rating |
| MERIDIAN IT SERVICES LIMITED | Barking | A rating |
| Meridian Lightweight Technologies UK Ltd | Sutton-in-Ashfield | A rating |
| Meridian Marketing International Ltd | Sunbury on Thames | A rating |
| MERIDIAN MARLOW LIMITED | BUCKINGHAMSHIRE | A rating |
| MERIDIAN MARLOW LTD | Marlow | A rating |
| Meridian Media Holdings Limited | London | A rating |
| Meridian Medical Limited | Littlehampton | A rating |
| Meridian Peoples Holdings Limited | London | A rating |
| Meridian productivity | London | A rating |
| MERIDIAN READING LIMITED T/A CROWN PLAZA READING | BERKSHIRE | A rating |
| Meridian Restaurants Limited T/A Riverside Cantonese Restaurant | Cardiff | A rating |
| Meridian Risk Solutions Ltd, | LONDON | A rating |
| MERIDIAN SPACE UK LIMITED | London | A rating |
| Meridian Technique Limited | Southampton | A rating |
| Meridian Trust | Sawtry | A rating |
| Meridian Utilities | Belfast | A rating |
| Meridian West ltd | London | A rating |
| Meridians Properties UK Limited | Manchester | A rating |
| Meridiansoft Limited | Reading | A rating |
| Meridien Capital Management Ltd | London | A rating |
| Meridien Modena Limited | Lyndhurst | A rating |
| MERIDYENS INVESTMENT LTD | London | A rating |
| MERIL UK LIMITED | CRAWLEY | A rating |
| Merila P Ltd | Hailsham | A rating |
| Merisant UK Limited | High Wycombe | A rating |
| Merit Group Plc | London | A rating |
| Merit HealthCare Ltd | Royal Wooton Basset | A rating |
| Merit Homes Ltd | Bangor | A rating |
| Merit Intergrated Services | BEDFORD | A rating |
| Merit Market | Aveley | A rating |
| MERIT SUPPLIES LTD | MORDEN | A rating |
| Merit Tutors LTD | Ilford | A rating |
| Merit Wholesale Ltd | London | A rating |
| Meritcape Ltd | London | A rating |
| Merith House Hotel | Edinburgh | A rating |
| Meritor Heavy Vehicle Braking Systems (UK) Limited | Cwmbran | A rating |
| Meritum Integrated Care LLP | Ashford | A rating |
| MERJ LIMITED | LONDON | A rating |
| MERJE Limited | London | A rating |
| Merk 1 Limited | London | A rating |
| MERKLAND (ABERDEEN) LTD | Aberdeen | A rating |
| Merkle UK Three Ltd | London | A rating |
| Merkur Casino Holdings UK Limited | Milton Keynes | A rating |
| Merliion LTD | London | A rating |
| Merlin Energy Resources Ltd | Ledbury | A rating |
| Merlin Entertainments Group Limited | London | A rating |
| Merlin ERD Ltd | Perth | A rating |
| Merlin Flex Limited | Hartlepool | A rating |
| Merline Healthcare Ltd | Pudsey | A rating |
| Merling Care Limited | London | A rating |
| MERLO UK LTD | Ringwood | A rating |
| Merlyn Electronics Ltd | SALFORD | A rating |
| Mermaid Subsea Services (UK) Ltd | Aberdeen | A rating |
| Merman London Ltd | London | A rating |
| Mermut & Son Ltd trading as SINCE KITCHEN&BAR | SOUTHEND ON SEA | A rating |
| MerQube UK Limited | London | A rating |
| Merranti Accounting Ltd | East Grinstead | A rating |