| Mission EmployAble | Hayes, London | A rating |
| Mission Foods Europe | Middlesex | A rating |
| Mission Ghana Prayer Outreach Ministry Ltd | London | A rating |
| Mission Grove Primary School | London | A rating |
| Mission Health UK Limited | Dartford | A rating |
| Mission Mars Limited | Manchester | A rating |
| Mission Millions Ltd | Hounslow | A rating |
| Mission Produce UK | Dartford | A rating |
| Mission Zero Technologies Ltd | London | A rating |
| Mission44 | London | A rating |
| Missionaries of Charity | London | A rating |
| Missionaries of Charity Brothers | Manchester | A rating |
| MISSIONARIES OF ST FRANCIS DE SALES | HARROGATE | A rating |
| Missionaries of the Sacred Heart of Jesus | London | A rating |
| Missionary Congregation of Evangelizing Sisters of Mary | London | A rating |
| Missionary Sisters of the Immaculate | London | A rating |
| Missionary Society of St Paul | Brixton | A rating |
| Missoma | London | A rating |
| MIST HUT LTD | LONDON | A rating |
| Mister Men Limited | London | A rating |
| Mistev Export Health Certification Limited | Edinburgh | A rating |
| Misti Enterprises (UK) Limited | Dunstable | A rating |
| Mistley Cricket Club | Manningtree | A rating |
| Mistral AI UK Limited | London | A rating |
| Mistral Care Homes | Strathpeffer | A rating |
| Mistras Group Limited | Cambridge | A rating |
| MISTRY CAKES LIMITED | London | A rating |
| Mistura Enterprise Limited | Ashington | A rating |
| Mistvale Ltd | Longfield | A rating |
| Misun Kim T/A Jinny Salon | New Malden | A rating |
| Misya Steveneage Ltd T/A Misya meze grill | Stevenage | A rating |
| MIT HUB LIMITED | Rochester, | A rating |
| MITALI (ACCRINGTON) LTD | ACCRINGTON | A rating |
| Mitcham Building Supplies Ltd T/A MBS Ltd | Kent | A rating |
| Mitcham Dental Care | Mitcham | A rating |
| MITCHAM HEALTHCARE LIMITED | MITCHAM | A rating |
| Mitcham International Dental Centre | Mitcham | A rating |
| MITCHAM PROPERTIES LTD | London | A rating |
| Mitcheldean Surgery | Mitcheldean | A rating |
| Mitchell & Cleary Ltd t/a Your Care | Herne Bay | A rating |
| Mitchell & Murdoch Care Ltd | Dundee | A rating |
| Mitchell and Urwin Brickwork Contractors Limited | Ferrybridge | A rating |
| mitchell partners | taunton | A rating |
| MITCHELL'S NEWSAGENT T/A COSTCUTTER | BOURNEMOUTH | A rating |
| Mitchells & Butlers PLC | Birmingham | A rating |
| Mitchells Chartered Accountants Tax and Business Advisers | Chesterfield | A rating |
| Mitchellson Ltd | Wembley | A rating |
| MiTek Industries Limited | Dudley | A rating |
| Mith Global Ltd | Catcliffe | A rating |
| MITHA (TRAFALGAR) & CO T/A TRAFALGAR FILLING STATION | HUDDERSFIELD | A rating |
| Mithaas Pure Vegetarian Restaurant | Leicester | A rating |
| MITHAI GHAR LIMITED | LONDON | A rating |
| MITHILASMITA UK ARTS LIMITED | London | A rating |
| MITHOMOMO LIMITED | Preston | A rating |
| Mithra Retails Ltd | Gosport | A rating |
| Mithras Underwriting Europe SRL (UK Branch) | London | A rating |
| Mithrasol Limited | London | A rating |
| MITHU LIMITED | YARM | A rating |
| MITHUN ENTERPRISES LTD T/A SUBWAY | WIMBORNE | A rating |
| MITHUS CONTINENTAL MART LTD | Haverhill | A rating |
| Mitie Group Plc | Glasgow | A rating |
| Mitiga-UK Ltd. | London | A rating |
| Mitigate Limited | Southampton | A rating |
| Mitra Innovation Limited | London | A rating |
| Mitratech (UK) Limited | Burnham | A rating |
| Mitratech HotDocs (UK) Ltd. | Burnham | A rating |
| Mitre Maintenance Ltd | Manchester | A rating |
| Mitris Trading Limited | Hull | A rating |
| Mitro Limited T/A Westfield Convenience Store | Leicestershire | A rating |
| Mits UK Limited | London | A rating |
| MITSKILLS LTD | SURREY | A rating |
| Mitsubishi Chemical UK Limited | Hull | A rating |
| Mitsubishi Corporation International (Europe) Plc | London | A rating |
| Mitsubishi Corporation London Branch | London | A rating |
| Mitsubishi Electric Air Conditioning Systems Europe Ltd | Livingston | A rating |
| Mitsubishi Electric Corporation - UK office | London | A rating |
| Mitsubishi Electric Europe B.V. | Hatfield | A rating |
| Mitsubishi Estate London Limited | London | A rating |
| Mitsubishi HC Capital UK PLC | Staines upon Thames | A rating |
| Mitsubishi Heavy Industries EMEA, Ltd. | London | A rating |
| Mitsubishi Materials Corporation, London Office | London | A rating |
| Mitsubishi Pencil Co UK Ltd | Milton Keynes | A rating |
| Mitsubishi Power EMEA, Ltd | London | A rating |
| Mitsubishi UFJ Asset Management (UK) Ltd. | London | A rating |
| Mitsubishi UFJ Baillie Gifford Asset Management Limited | Edinburgh | A rating |
| Mitsubishi UFJ Trust and Banking Corporation | London | A rating |
| MITSUI & CO. ENERGY TRADING SINGAPORE PTE. LTD. (LONDON BRANCH) | London | A rating |
| Mitsui & Co. Europe Ltd | London | A rating |
| Mitsui Bussan Commodities Ltd | London | A rating |
| Mitsui Components Europe Limited | Ammanford | A rating |
| Mitsui E&S Machinery Europe Limited | London | A rating |
| Mitsui Fudosan (U.K.) Ltd | London | A rating |
| MITSUKI GEN LIMITED | LEICESTER | A rating |
| Mitsuryu Hampstead Limited T/A Mitsuryu Hampstead | London | A rating |
| MITTAL CONSULTANCY PVT LTD | Potters bar | A rating |
| Mittal Investments UK Limited | London | A rating |
| Mitto Technologies Limited | London | A rating |
| Mituson Ltd | Smethwick | A rating |
| MITUTOYO (UK) LTD | Andover | A rating |
| MITY'S KITCHEN LTD | Wolverhampton | A rating |
| Miura & Partners UK Limited | London | A rating |
| Mivan Marine Ltd | Antrim | A rating |
| MIX ASSOCIATES LTD | LONDON | A rating |
| Mix Max Motors Limited | Bradford | A rating |
| Mix Store Ltd | Weston Super mare | A rating |
| MiX Telematics Europe Ltd | Birmingham | A rating |
| Mixam UK Ltd | Watford | A rating |
| Mixcloud Limited | London | A rating |
| MIXED WORLD LIMITED T/A HUT BAZAR | Edinburgh | A rating |
| Mixergy Limited | Cassington | A rating |
| Mixode Ltd | London | A rating |
| MIXORCHICKEN LTD | Dudley | A rating |
| Mixpanel UK Ltd | Bristol | A rating |
| MIXWARD LIMITED | London | A rating |
| MIXX MAGIC LTD | Manchester | A rating |
| Miyaki Lounge Limited trading as Miyaki Restaurant & Bar | Leicester | A rating |
| Miyako Teppanyaki Japanese Restaurant | Birmingham | A rating |
| Mizaans of Scotter Limited | Scotter | A rating |
| Mizrahi Ltd | London | A rating |
| Mizrahi-Tefahot Bank Ltd | London | A rating |
| Mizuho Bank, Ltd. | London | A rating |
| Mizuho EMEA Corporate Services Limited | London | A rating |
| Mizuho International plc | London | A rating |
| MIZUKI LTD t/a SAMURAI TEPPANYAKI & SUSHI RESTAURANT | WINCHESTER | A rating |
| Mizuno Corporation (UK) | Wokingham | A rating |
| MIZUNO CORPORATION UK LIMITED | Wokingham | A rating |
| Mizuno Gakuen London Limited | London | A rating |
| MJ & Sons Pvt Ltd | PONTYPRIDD | A rating |
| MJ Abbott Limited | Salisbury | A rating |
| MJ Birtwistle and Co Limited | Irlam | A rating |
| MJ Booze Ltd. T/As Maidenhead Food & Wine | Maidenhead | A rating |
| MJ BRISTOL FOODS LTD | Bristol | A rating |
| MJ BUILDING CONSTRUCTIONS LTD | Bolton | A rating |
| MJ Car Sales (Peterborough) Limited | Peterborough | A rating |
| MJ Convenience Store | Coventry | A rating |
| MJ Data Solutions Ltd | Ruislip | A rating |
| MJ Dent Ltd | Crewe | A rating |
| MJ Dixy Ltd T/A Dixy Chicken | Coventry | A rating |
| MJ Dreams Company Limited | Hounslow | A rating |
| MJ ENERGY SERVICES LTD | DEWSBURY | A rating |
| MJ Family Group Ltd | London | A rating |
| MJ HALAL FOODS LTD | Coventry, | A rating |
| MJ Homecare Staffing Limited | Taunton | A rating |
| MJ LOGISTICS LEICESTER LTD | LEICESTER | A rating |
| MJ PETROLEUM LTD | LEICESTER | A rating |
| MJ Quinn Integrated Services Limited | Liverpool | A rating |
| MJ Signs Limited | Walton on Thames | A rating |
| MJ SOFT DRINKS LTD | SOUTHALL | A rating |
| MJ Williams Ltd | Bristol | A rating |
| MJB MOTOR SERVICES LIMITED | Hinckley | A rating |
| MJES MEC. Y PTAS. EN MARCHA UK, LIMITED | Edinburgh | A rating |
| MJF INTERIORS LIMITED | London | A rating |
| MJH ACCOUNTANTS Limited | Preston | A rating |
| MJH food services ltd | London | A rating |
| MJI Enterprise Ltd | London | A rating |
| MJI Foods Limited | Farnham | A rating |
| MJIT Ltd | Crawley | A rating |
| MJK Resourcing Ltd | Luton | A rating |
| MJM Energy & Safety Services | Stockport | A rating |
| MJM Marine Ltd | Newry | A rating |
| MJMK | London | A rating |
| MJMK RESTAURANTS LIMITED | LONDON | A rating |
| MJP Accountants LLP | TORQUAY | A rating |
| MJP Conveyancing Ltd | Norwich | A rating |
| MJR Controls Ltd | Stockton on Tees | A rating |
| MJS (KENT) Limited T/A Sopranos | Sevenoaks | A rating |
| MJS BUSINESS MANAGEMENT SERVICES LTD | COVENTRY | A rating |
| MJS Care Limited T/A Park Lodge Residential Care Home | St Asaph | A rating |
| MJS Patel T/AS Hillton Dentistry | Sittingbourne | A rating |
| MJS Project Services Ltd | Richmond | A rating |
| MJS Stores Limited | Cardiff | A rating |
| Mjunction Services Limited UK | London | A rating |
| MJZ LTD | London | A rating |
| Mk & Co Services Ltd | London | A rating |
| MK 2017 LTD | Plymouth | A rating |
| MK Accountancy Services Pvt Ltd | Rochdale | A rating |
| MK ALI PEPES LTD | HAMILTON | A rating |
| MK ALL NETWORK COMMUNICATIONS LTD | Cardiff | A rating |
| MK ANALYTICS LTD | Milton Keynes | A rating |
| MK Basketball Foundation | Milton Keynes | A rating |
| MK BEST CAR DEALS LTD | MILTON KEYNES | A rating |
| MK BLUE LTD | TAMWORTH | A rating |
| MK BUILDERS (MIDLANDS) LTD | Nottingham | A rating |
| MK Builders Merchants Limited | Birmingham | A rating |
| MK Care Services | Leeds | A rating |
| MK Complete Joinery Limited | Richmond | A rating |
| MK CONSTRUCTION & RENOVATION LTD | London | A rating |
| MK CONTRACTORS LIMITED | Bedfordshire | A rating |
| MK DENTAL & IMPLANT CLINIC MARKET DENTAL 1 | Brighton | A rating |
| MK Design & Build LTD | London | A rating |
| MK Dosa Corner (Halal) Ltd | Milton Keynes | A rating |
| MK E1 FOOD LTD T/A OODLES CHINESE | Ilford | A rating |
| MK ENGINEERING AND SURVEYS LTD | Liverpool | A rating |
| MK ENGINEERING EXPERT LIMITED | London | A rating |
| MK Enterprize Limited | Grays | A rating |
| MK EURO HALAL LTD | Milton Keynes | A rating |
| MK Fast Food Limited | Reading | A rating |
| MK FILLING STATION LTD | West Drayton | A rating |
| MK FOOD & WINE ELSTOW LTD | Bedford | A rating |
| MK FOOD AND WINE STORE LTD | HUDDERSFIELD | A rating |