| Marposs Limited | Coventry | A rating |
| Marqeta UK Ltd | London | A rating |
| MARQS SPORT LTD | Leicester | A rating |
| Marquee Chameleon Ltd T/A Chameleon Live | Milton Keynes | A rating |
| Marquee Contracting | Waltham Abbey | A rating |
| MARQUESS DESIGN LTD | London | A rating |
| Marquis Technologies Limited | London | A rating |
| Marquiviity Media Limited | Gosport | A rating |
| Marr Contracting International Limited | London | A rating |
| Marrakesh place | Dundee | A rating |
| Marriott Harrison LLP | London | A rating |
| Marriott Hotels Ltd | London | A rating |
| Marriott's Medical Practices | Norwich | A rating |
| MARRIOTTS CONSULTANCY LLP | CHELMSFORD | A rating |
| MARRWELL LTD | Oxford | A rating |
| Marry Food & Wine | Harrow Weald | A rating |
| Marry Harry Limited | Troon | A rating |
| Marry Ltd | Morecambe | A rating |
| Mars & Co Consulting Limited | London | A rating |
| Mars Advisors Limited | London | A rating |
| MARS CARE SERVICES LIMITED | LEICESTER | A rating |
| MARS CHESHIRE LIMITED | Handforth | A rating |
| MARS DIGITAL SOLUTIONS LTD | Manchester | A rating |
| Mars Food UK Limited | Slough | A rating |
| Mars Food UK Limited | Melton Mowbray | A rating |
| MARS HILL GLOBAL LIMITED | Leicester | A rating |
| Mars Hospitality (UK) Limited | Invergarry | A rating |
| Mars Information Services, a division of Mars Wrigley Confectionery UK Limited | Slough | A rating |
| MARS INSTALLATION AND CLADDING LIMITED | Slough | A rating |
| Mars Petcare UK | Melton Mowbray | A rating |
| Mars Secure Transport & Recruitment Service Ltd | Borehamwood | A rating |
| MARS SPACE LTD | Southampton | A rating |
| Mars Wrigley Confectionery UK Limited | Slough | A rating |
| MARS-HILL (AYLESBURY) LTD | AYLESBURY | A rating |
| Marsden Cricket club | South Shields | A rating |
| Marsden Grange 2 Limited | Nelson | A rating |
| Marsden Grange residential care home | Nelson | A rating |
| Marsden Health LTD | Coventry | A rating |
| Marsden Road Health Centre | South Shields | A rating |
| Marse Limited | Winchester | A rating |
| Marsh & Partners Ltd | London | A rating |
| Marsh Design Limited | HUDDERSFIELD | A rating |
| Marsh Farm Hotel LTD | London | A rating |
| MARSH HILL NEWS | LONDON | A rating |
| Marsh House | Stanway | A rating |
| Marsh Keene Limited | Whitchurch | A rating |
| Marsh Services Ltd | London | A rating |
| MARSH SUPERSTORES | LUTON | A rating |
| Marsh Wall Ltd T/A Berry BMW | Hounslow | A rating |
| MARSHAL REMIT LTD | Slough | A rating |
| MARSHAL SHOPFITTERS AND CONSTRUCTION LTD | ENGLAND | A rating |
| Marshall Amplification Plc | Milton Keynes | A rating |
| Marshall Arts Limited | London | A rating |
| Marshall Eaton Holdings Ltd | Farnham | A rating |
| MARSHALL EATON LEISURE LTD T/AS THE FOX INN | FARNHAM | A rating |
| Marshall Land Systems Ltd | Cambridge | A rating |
| Marshall Motor Group | Milton Keynes | A rating |
| Marshall of Cambridge Holdings | Cambridge | A rating |
| Marshall Rosenberg Limited | London | A rating |
| MARSHALL SHOPFRONT LIMITED | Hornchurch | A rating |
| Marshall Street Ltd | LONDON | A rating |
| Marshall Survey Associates Ltd | Chessington | A rating |
| Marshall Wace Asset Management Limited | London | A rating |
| Marshall's Traditional Chippy Ltd | Leicester | A rating |
| Marshalls Coaches LLP | Leighton Buzzard | A rating |
| Marshalls Plc | Elland | A rating |
| Marshalls The Bakers Ltd | Gateshead | A rating |
| Marsheen Limited | London | A rating |
| Marshfield Cricket Club | Chippenham | A rating |
| MARSHFIELD MOTORS LTD | Cardiff | A rating |
| Marshmallow Technology Ltd | London | A rating |
| Marshmead Ltd | Rossendale | A rating |
| MARSHWOOD FARMS LTD | BURNHAM | A rating |
| MARSIN BAKERS LTD | Solihull | A rating |
| Marsm Limited | London | A rating |
| Marsoft Inc. Limited | London | A rating |
| MARSOL CAPITAL INVESTMENT UK LTD | London | A rating |
| MARSON HAM LTD | Tenbury Wells | A rating |
| Marstan BDB LLP | Sawston | A rating |
| MARSTART LTD | LONDON | A rating |
| Marston (Holdings) Limited | London | A rating |
| MARSTON BRASSWARE LIMITED | WOLVERHAMPTON | A rating |
| Mart Network Solutions Limited | West Drayton | A rating |
| Martax Limited t/a Martax Accountants | New Malden | A rating |
| MarTech Alliance Limited (Trading as LXA) | London | A rating |
| Martek Marine Ltd | Rotherham | A rating |
| Martek Motor Services Limited t/a Martek Motor Services | Oldbury | A rating |
| Martello Financial Services Ltd | London | A rating |
| Martha Schwartz Partners Ltd | London | A rating |
| Martha Trust Hereford Ltd | Hereford | A rating |
| Martifer UK Limited | London | A rating |
| Martin & Heller | London | A rating |
| Martin Aitken and Co | Glasgow | A rating |
| Martin and Monica Care Services Limited | Wolverhampton | A rating |
| Martin Arnold Limited | London | A rating |
| Martin B Squires Limited T/A The Green Veterinary Surgery | Penrith | A rating |
| Martin Brudnizki Design Studio | London | A rating |
| Martin Collins Enterprises Ltd | Lambourn Woodlands | A rating |
| Martin Currie Investment Management Limited | Edinburgh | A rating |
| Martin Dairy Ltd | Bodmin | A rating |
| Martin Design Associates Ltd | YORK | A rating |
| Martin Duggan T/A Ensix Turbine Services | Magherafelt | A rating |
| MARTIN FUEL SERVICE LTD | Norwich | A rating |
| Martin James Medical Limited | Truro | A rating |
| Martin Kemp Design Limited | London | A rating |
| Martin Mart Ltd | Ilford | A rating |
| Martin Newsagent | Steyning | A rating |
| MARTIN Renewables Solutions LTD | Wardle | A rating |
| Martin Robeson & Partners Ltd | London | A rating |
| Martin Sklan & Co Chartered Accountants | London | A rating |
| Martin Smith | Isleham | A rating |
| Martin Tolhurst Partnership LLP | Gillingham | A rating |
| Martin Tripp Associates Ltd | Lewes | A rating |
| MARTIN WEST CREATIONS LTD | Aylesbury | A rating |
| Martin-Baker Aircraft Company Limited | Higher Denham, near Uxbridge | A rating |
| Martin-Brower UK Ltd | Hemel Hempstead | A rating |
| Martinez Otero UK, Ltd | London | A rating |
| MARTINS BUILDERS & DECORATORS LIMITED | London | A rating |
| Martins Costa Immigration Ltd | LONDON | A rating |
| Martins Lane Dental Partnership | Wallasey | A rating |
| Martins Maintenance | Manchester | A rating |
| Martlets Visionplus Limited T/A Specsavers Opticians | Crawley | A rating |
| Martley Capital Real Estate Investment Management Ltd | London | A rating |
| Marton Arms Limited T/A The Marton Arms | Carnforth | A rating |
| Marton Care Homes Limited | Carnaby | A rating |
| Marton Care Ltd | Bridlington | A rating |
| marton cricket club | middlesbrough | A rating |
| Marton Mills Co Ltd | Otley | A rating |
| MARTUNIS LTD | Walsall | A rating |
| MARTWORLD CARE SERVICES LIMITED | WOLVERHAMPTON | A rating |
| MARU MAA LTD | CROYDON | A rating |
| Maruang Korat Ltd | London | A rating |
| Marubeni Europe plc | London | A rating |
| MARUGAME UDON (EUROPE) LIMITED | Bristol | A rating |
| Marus Bridge Practice | Wigan | A rating |
| MARUSHIN UK LTD T/A FELT Bakery | London | A rating |
| Marussia Beverages | London | A rating |
| Marut Trading Limited | Huntingdon | A rating |
| Maruthavel Retails Ltd | North Humberside | A rating |
| Maruthi Express trading as Rice and Curry | Middlesex | A rating |
| MARUTHI SERVICES LIMITED | Grimsby | A rating |
| MARUTI ELEVATOR INTERIORS UK LTD | Ashford | A rating |
| Maruti PH Group Limited | Crawley | A rating |
| Maruti Restaurant and Grocery | Cardiff | A rating |
| MARUWA EUROPE LTD | ASHFORD | A rating |
| Marv Studios Limited | London | A rating |
| MARVEL CONSTRUCT LTD | London | A rating |
| MARVEL HOSPITALITY LTD | London | A rating |
| Marvel Prototyping Limited | London | A rating |
| Marvel Tech Business Consulting | Brentford | A rating |
| MARVELLO TRADING | South Ockendon | A rating |
| Marvellous Pharma LTD | Luton | A rating |
| Marvellous Properties Limited | Beckenham | A rating |
| MARVELLOUS SECURITY SERVICES LIMITED | Cheadle | A rating |
| MARVELLOUS TALENT LTD | London | A rating |
| Marvelous Europe Ltd | Aylesbury | A rating |
| MARVGALLUP GROUP LTD | London | A rating |
| MARVGALLUP TRAVELS AND TOURS CONSULTANCY LTD | London | A rating |
| Marvic Textiles Ltd | London | A rating |
| Marville Superstore Limited | Market Deeping | A rating |
| Marvin Miller Solutions Limited | Sheffield | A rating |
| Marvin's Magic Ltd | Hemel Hempstead | A rating |
| MARWA TRADING LIMITED | Slough | A rating |
| MARWALI LTD | Denmead | A rating |
| Marwar Caterers Limited | Hinckley | A rating |
| Marwood Convenience Store Limited T/As Nisa Local | Leicester | A rating |
| Marwood Group Limited | London | A rating |
| Marwood UK Ltd | London | A rating |
| Marwyn Capital LLP | London | A rating |
| Marx Ayur Limited trading as Marx Ayur | Northampton | A rating |
| Marx Technology Consulting Ltd | London | A rating |
| MARY AMBER LTD | Ashton-Under-Lyne | A rating |
| Mary Bilsborough T/A as Cheshire Support Services | Winsford | A rating |
| MARY CONVENIENCE STORES LTD | Coulsdon | A rating |
| mary davey chemists ltd | Bootle | A rating |
| Mary Griffiths T/A Ty Melin Residential Home for the Elderly | Cardiff | A rating |
| Mary Hare School | Newbury | A rating |
| Mary Jayne Jarvis and Peter Jarvis Trading as Rathmore Care Home | Lytham Saint Annes | A rating |
| MARY MATHA ENTERPRISES LTD | BRIDGEND | A rating |
| Mary Mount Limited | Keswick | A rating |
| Mary Oppenheimer Daughters (UK) Limited | London | A rating |
| MARY PETER LIMITED | London | A rating |
| Mary Pritchard | York | A rating |
| Mary Riposta Ltd | London | A rating |
| MARY ROSE HOTEL LIMITED | Orpington, Kent | A rating |
| Mary Rush Care Ltd | Gloucester | A rating |
| Mary Seacole Day Nursery & Family Support Unit | Town | A rating |
| mary the great ltd | Scunthorpe | A rating |
| Mary's Cafe Bistro | Edinburgh | A rating |
| Maryam Kitchen Ltd | Carshalton | A rating |
| Maryam Transport Ltd | Forest Gate | A rating |
| Maryam Welfare Society | Oldham | A rating |
| Maryam's Nursery Ltd | London | A rating |
| MARYAMHOFU LIMITED T/A BENGAL BERTIE'S | West Sussex | A rating |
| Maryculter House Limited T/A Maryculter House Hotel | Aberdeen | A rating |
| Marygold Care UK Ltd | Middlesex | A rating |
| maryhill dispensary Ltd | glasgow | A rating |
| MARYLAND HEALTHCARE LTD | County Down | A rating |
| MARYLAND INTERNET CAFE LTD | LONDON | A rating |
| Marylebone Cricket Club | London | A rating |