| Maylands Enterprises Limited | Hornchurch | A rating |
| MAYLANDS HEALTHCARE | HORNCHURCH | A rating |
| Maymana Market Ltd | Maidstone | A rating |
| MAYMAR BUILDING SERVICES LTD | Castle Vale, Birmingham | A rating |
| Maymask (253) Ltd | Redcar | A rating |
| Maynard and Harris Plastics Limited | Beccles | A rating |
| Maynard Capital Ltd | London | A rating |
| Maynard Design Consultancy Ltd | London | A rating |
| Maynard Leigh Associates | London | A rating |
| Mayo Clinic (UK) Ltd | London | A rating |
| Mayo Clinic Healthcare LLP | London | A rating |
| Mayo Engineering Ltd | March | A rating |
| Mayo Foods Ltd | Bolton | A rating |
| MAYONNAISE TREASURE YORK LIMITED | York | A rating |
| MAYORLYTE LTD | Plymouth | A rating |
| Mayphil (UK) Limited | Merthyr Tydfil | A rating |
| Maypole Dental Surgery | Birmingham | A rating |
| Maypole Therapeutic Education Ltd | Streatham | A rating |
| Maypree Healthcare Limited | Rotherham | A rating |
| Mayra Hosiery Ltd | London | A rating |
| MAYRES TRADING LTD | Manchester | A rating |
| Mayru Gems Ltd. | London | A rating |
| Mays Management Limited | London | A rating |
| MAYSOON DESIGNER LTD | London | A rating |
| Maysprings Limited | Welwyn Garden City | A rating |
| Mayur Catering Services Ltd | West Bromwich, | A rating |
| Mayur Indian Restaurant (Carrickfergus) Ltd | Carrickfergus | A rating |
| Mayuran Nithiyananthan | Worcester, Worcestershire | A rating |
| Mayuran Selvarajah T/A Streatham News & Food | London | A rating |
| Mayuri Consultant Services Limited | Cardiff | A rating |
| MAYURS CATERERS LIMITED | HARROW | A rating |
| Maz & Sons MOT & Auto Repairs | Darlington | A rating |
| Maz and Co Ltd | Ilford | A rating |
| Maz Foods Ltd. T/A Oodles Chinese | London | A rating |
| MAZ SW17 FOODS T/A OODLES CHINESE | London | A rating |
| MAZ786 LTD | ROMFORD | A rating |
| Mazaa Taste Ltd. T/ A Mazaa | Manchester | A rating |
| MAZAH LIMITED T/A FOSSE KEBAB & CURRY HOUSE / PIZZA MAGIC | Leicester | A rating |
| Mazards Limited | London | A rating |
| MAZAY DAAR LTD | Hounslow | A rating |
| MAZAYA MARKETING SUPPORT LIMITED | London | A rating |
| Mazda Motors UK Limited | Dartford | A rating |
| Maze AI Limited | London | A rating |
| Maze Collections Limited | Barnet | A rating |
| Maze Consultancy Ltd | London | A rating |
| Maze Fire Consulting Limited | Manchester | A rating |
| Maze Rattan Ltd | Haverhill | A rating |
| Maze Workplace Limited | Cheltenham | A rating |
| Maze.Design Limited | London | A rating |
| MAZEE GROUP LTD | Perth | A rating |
| Mazepoint Ltd | London | A rating |
| Mazi Fine Foods LTD | London | A rating |
| Mazik Global Limited | London | A rating |
| MAZIN AL-ZIBARI T/A WEST HORLSEY DENTAL PRACTICE | WEST HORSLEY | A rating |
| MAZIN CARS LTD | BIRMINGHAM | A rating |
| Mazin Healthcare Limited | Huddersfield | A rating |
| Mazlum London Limited | London | A rating |
| Mazo Catering Ltd | Oxfordshire | A rating |
| Mazon Global Limited | Sunderland | A rating |
| MAZULI LTD | Bradford | A rating |
| MAZYL & IBRAHIM LTD T/AS JAMAICA BLUE KINGSTON | Kingston | A rating |
| MAZZ FM LTD | Slough, | A rating |
| Mazz Foods Ltd T/A Missmillies | Bristol | A rating |
| MAZZA CURRY & GRILL LIMITED | Crawley | A rating |
| Mazzali Ltd | Mitcham | A rating |
| Mazzis Cafe | Wallington | A rating |
| MAZZOLENI ART LIMITED | London | A rating |
| Mazzullo Russell Landscape Design Ltd | London | A rating |
| MB & B Manning & Son | Ledbury | A rating |
| MB Advertising & Marketing Limited | Sheffield | A rating |
| MB Aerospace Ltd | Motherwell | A rating |
| MB Aerospace Newton Abbot Limited | Newton Abbot | A rating |
| MB ASHFORD LIMITED T/A MUFFIN BREAK | Ashford | A rating |
| MB BASILDON LIMITED T/A MUFFIN BREAK | Basildon | A rating |
| MB Belfast Limited | Belfast | A rating |
| MB Caregroup ltd | Edgware | A rating |
| MB CARS SWINDON LIMITED T/A MB CARS | Swindon | A rating |
| MB DESIGN & COSNTRUCT LIMITED | Barnet | A rating |
| MB Embroidery London Ltd | LONDON | A rating |
| MB HASTINGS LIMITED T/A MUFFIN BREAK | Hastings | A rating |
| MB Health Ltd | Birmingham | A rating |
| MB Langmuir & Hay (UK) Ltd | Glasgow | A rating |
| MB Law Solicitors | Hounslow | A rating |
| MB Lindisfarne LLP | Fraserburgh | A rating |
| MB McGrady & Co | BELFAST | A rating |
| MB Newry Limited | Newry | A rating |
| MB ONLINE LTD | LUTON | A rating |
| MB Professional Beauty Ltd | Aylesbury | A rating |
| MB Prosperity Ltd | Gairloch | A rating |
| MB SECURITY SERVICES STOKE LTD | Stoke-On-Trent | A rating |
| MB STAINES LIMITED | Grays | A rating |
| MB Supported Housing Ltd | Oxford | A rating |
| MB TRADERS LTD | London | A rating |
| MB TYRES AND WHEELS LTD | London | A rating |
| MB Vision LLP | Fraserburgh | A rating |
| MB&G Insurance Services LTD | Wallsend | A rating |
| MBA Health Ltd | Salford | A rating |
| MBA Pharma Limited | birmingham | A rating |
| MBA SALES LTD T/A MBA PHONES | Bolton | A rating |
| MBA TRAVELS LIMITED | Birmingham | A rating |
| MBANDS LIMITED | London | A rating |
| MBB TRADING LIMITED | Harlow | A rating |
| MBC Timber Frame UK Ltd | Gloucester | A rating |
| MBDA UK Limited | Stevenage | A rating |
| MBE ALTRINCHAM LTD | ALTRINCHAM | A rating |
| MBG (INT) Ltd | London | A rating |
| MBH Design Studio Ltd | West Bylfleet | A rating |
| MBI Inc. | Chessington | A rating |
| MBK Logistics Ltd | Gloucester | A rating |
| MBK Solicitors | Tunbridge Wells | A rating |
| MBM Accountancy | Bellshill | A rating |
| MBM Commercial LLP | Edinburgh | A rating |
| MBM Consulting Ltd | London | A rating |
| MBM FOODS SERVICES LTD | CAMBERLEY | A rating |
| MBM Groundworks Limited | Hayes | A rating |
| MBM Print SCS Ltd | East Kilbride | A rating |
| MBM Tuition Ltd | Slough | A rating |
| MBNI Holdings Ltd | Newtownabbey | A rating |
| MBS (B'HAM) Ltd | Birmingham | A rating |
| MBS INTERIORS (SOT) LTD | Stoke-On-Trent | A rating |
| MBS Lighting UK Limited | Slough | A rating |
| MBS London Ltd | London | A rating |
| MBS STORE LTD | Preston | A rating |
| MBS Survey Software Ltd | STEYNING | A rating |
| MBT CONSULTANCY UK LTD | Reading | A rating |
| MC (Charlotte Street) Ltd T/A Maltby Capital Advisory | London | A rating |
| MC BARS LIMITED | BRENTFORD | A rating |
| MC Care Solutions | Bournemouth | A rating |
| Mc circus productions | Gateshead | A rating |
| MC Foods Camlough Ltd | Newry | A rating |
| MC General Services (UK) Limited | London | A rating |
| MC GOURMET LTD T/A THE GOURMET | North Lincolnshire | A rating |
| MC International Haulage Limited | Ashford | A rating |
| Mc Kelvey Asbestos Removal Ltd | Castlederg | A rating |
| Mc Kelvey Construction Ltd | castlederg | A rating |
| MC Topco Limited | Liverpool | A rating |
| MC Truck & Bus Ltd | Aylesford | A rating |
| MC-MARVCAELA LTD | Kettering | A rating |
| MC13 LTD | Southsea | A rating |
| mca Business Ltd | Lighthorne | A rating |
| MCA CARE SOLUTIONS LTD | CARDIFF | A rating |
| MCA LAI SERVICES LTD | Wembley | A rating |
| McAdam Design Limited | Belfast | A rating |
| McAfee Security UK Limited | Globe Park | A rating |
| McAleer & McGarrity Limited | Cookstown | A rating |
| McAleer & Rushe Contracts UK Ltd | London | A rating |
| MCALLISTER BROS LIMITED | NEWRY | A rating |
| Mcallister Olivarius | Reading | A rating |
| McAlorum Holdings Limited | Bangor | A rating |
| McAlpine & Co Ltd | Glasgow | A rating |
| McAlpine Grant Ilco Ltd | Oxford | A rating |
| McAndrew Martin Limited | Portsmouth | A rating |
| MCAP Global Finance (UK) LLP | London | A rating |
| MCap Global Finance Limited | London | A rating |
| McArdle Mushrooms Ltd | Armagh | A rating |
| McArthurGlen UK Ltd | London | A rating |
| McAuley Fabrication Ltd | Ballymoney | A rating |
| McBains Limited | London | A rating |
| MCBITSSTECH LIMITED | London | A rating |
| McBraida PLC | Bristol | A rating |
| McBrides | Newtownards | A rating |
| MCBRITAIN Ltd | Stafford | A rating |
| Mcbull Facilities Management Ltd | ELESTREE | A rating |
| MCC LAW Ltd T/A Denning Chambers | London | A rating |
| MCCA ACCOUNTANTS LTD | London | A rating |
| McCabe Ford Williams | Maidstone | A rating |
| McCain Foods (GB) Ltd | Scarborough | A rating |
| McCallion Engineering Limited | Portglenone | A rating |
| McCann & Partners Ltd | Penarth Marina | A rating |
| McCann Erickson Advertising Ltd | London | A rating |
| McCann Erickson EMEA Ltd | London | A rating |
| McCann Manchester Limited | Macclesfield | A rating |
| McCann-Erickson Healthcare UK Limited | London | A rating |
| McCarey Simmonds Limited | Steyning | A rating |
| McCarthy & Stone Retirement Lifestyles Limited | Bournemouth | A rating |
| MCCARTHY CARS (UK) LTD | CROYDON | A rating |
| McCarthy Denning Limited | :London | A rating |
| McCarthy Taylor Systems Ltd | Gloucester | A rating |
| McCarthy Tetrault | London | A rating |
| McCauley Trailers Ltd | Co Antrim | A rating |
| McCausland Group Limited | Belfast | A rating |
| MCCGLC LIMITED | LONDON | A rating |
| McChrystal Group Limited | London | A rating |
| McCloskey International Ltd | Coalisland | A rating |
| MCCLOUD PROFESSIONAL SERVICES LTD | Shropshire | A rating |
| McComb Partnership Ltd | Orpington | A rating |
| McConnel Limited | Worcstershire | A rating |
| McCormick (UK) Ltd | Haddenham | A rating |
| McCorry Agri Supplies | Derrylin | A rating |
| MCCOY FAMILY LTD | Flitwick | A rating |
| McCoy Family Ltd t/a Bluebird Care | Flitwick | A rating |
| MCCOYS WENDOVER LIMITED | aylesbury | A rating |
| McCrae Training Ltd | East Kilbride | A rating |
| McCrone UK Limited | SOUTHAMPTON | A rating |
| MCCrory Engineering Limited | Aughnacloy | A rating |
| McCulla (Ireland) Limited | Lisburn | A rating |
| McCulla Ireland Limited | Lisburn | A rating |
| McCulloughs Ltd | Newmarket | A rating |
| McCune Management Services Ltd | Belfast | A rating |
| MCD Consultancy Ltd | London | A rating |