| MCD engineering ltd | dungannon | A rating |
| MCD Global Franchising Limited | London | A rating |
| MCD Security Herts Limited | St Albans | A rating |
| McDermid Controls Ltd | Glasgow | A rating |
| MCDERMOTT ENERGY SOLUTIONS (UK) LIMITED | London | A rating |
| McDermott Marine Construction Limited | London | A rating |
| McDermott Will & Schulte UK LLP | London | A rating |
| McDev Healthcare Ltd | Rotherham | A rating |
| McDon Transport | Dungannon | A rating |
| McDonald Architects Limited | London | A rating |
| McDonald's Restaurants Limited | London | A rating |
| MCDOWELL DIGITAL MEDIA LTD | London | A rating |
| MCDR LTD | London | A rating |
| McElmeel Mobility Services Ltd. | Armagh | A rating |
| McErlean Associates Ltd | Toomebridge | A rating |
| McEWan Fraser Services Limited | Edinburgh | A rating |
| MCF Ltd | London | A rating |
| McFarland Consulting Ltd | Belfast | A rating |
| McFarlane Physiotherapy Limited | Greenock | A rating |
| McFarlane Trust Ltd. | Paisley | A rating |
| McFarlaneMcCoubreyandWoodside | Larne | A rating |
| McGahan Engineering | Dungannon | A rating |
| McGarrity Bros. Ltd | Omagh | A rating |
| McGean-Rohco (U.K.) Limited | Wolverhampton | A rating |
| McGee Group (Holdings) Ltd | WEMBLEY | A rating |
| McGill and Partners | London | A rating |
| McGill's Bus Service Ltd | Greenock | A rating |
| McGlashans Property Services | London | A rating |
| McGlaughlin's Coffee House & Bakery | Cookstown | A rating |
| McGraw Hill Education (UK) Limited | London | A rating |
| McGuinness Lettings Limited | LONDON | A rating |
| McGuire + Farry Limited | Belfast | A rating |
| McGuirewoods London LLP | London | A rating |
| McGuirk Fishing Ltd | Maryport | A rating |
| McHale Komatsu Limited | Redditch | A rating |
| McHale Legal Limited | Altrincham | A rating |
| McHale Plant Sales Limited | Tamworth | A rating |
| McHare Ltd | Newcastle | A rating |
| MCI COMMERCIAL LTD | Northampton | A rating |
| MCI Systems LTD | Farnham | A rating |
| McIlwaine Landscape Architects | Newtownards | A rating |
| McInnes Gardner Limited | Glasgow | A rating |
| McJoseph & Sons (DP) Ltd T/A Domino's Pizza | West Wickham | A rating |
| MCK Associates Limited | Preston | A rating |
| MCK Global Limited | Northampton | A rating |
| Mckat Magic Masala Pvt Ltd T/A Magic Masala | England | A rating |
| McKay Pharmacy | Belfast | A rating |
| McKeeman Farms | Ballymoney | A rating |
| McKeever Hotels | Newtownabbey | A rating |
| McKeevers Chemists | Armagh | A rating |
| McKenna Precision Engineering Ltd | Omagh | A rating |
| Mckenzie Care Limited | Burnham | A rating |
| MCKENZIE DISTRIBUTION LTD | Oldbury | A rating |
| Mckenzie Group Practice | Hartlepool | A rating |
| McKenzie Intelligence Services | London | A rating |
| McKenzie Strickland Associates Limited | Aberfeldy | A rating |
| McKeown Fine Foods Ltd | Rasharkin | A rating |
| McKesson Strategic Services Ltd | London | A rating |
| McKinleys Group Trading Ltd | Newmarket | A rating |
| McKinnon Harris UK Ltd | London | A rating |
| McKinsey & Company Inc. United Kingdom | London | A rating |
| McKinsey Management Services Limited | London | A rating |
| MCKINSTRY METAL RECYCLING LIMITED | MALLUSK | A rating |
| MCKINSTRY SKIP HIRE LIMITED | CRUMLIN | A rating |
| MCL CONSOLIDATIONS AND FREIGHTS UK LTD | London | A rating |
| MCL Contracts (UK) Ltd | Birmingham | A rating |
| McLaren Automotive Limited | Woking | A rating |
| McLaren Construction Ltd | London | A rating |
| McLaren Presentation Limited | Port Glasgow | A rating |
| McLaren Racing Limited | Woking | A rating |
| McLaughlin & Harvey Construction Limited | Bellshill | A rating |
| McLaughlin & Harvey Ltd | Newtownabbey | A rating |
| MCLEMORE KONSCHNIK LLP | London | A rating |
| McLeod + Aitken | Leeds | A rating |
| MCLORINAN CONSULTING LIMITED | Belfast | A rating |
| Mcloud Limited | London | A rating |
| MCM Endeavour Ltd T/A Pizza Co. | Belfast | A rating |
| MCM Net Ltd | London | A rating |
| MCMANUS CONTRACTS LIMITED | Enniskillen | A rating |
| McManus Managed Pub Co Limited | Northampton | A rating |
| McMenon Engineering Services Limited | Workington | A rating |
| MCMGHC. LTD(Merchant City Medical Group) | Glasgow | A rating |
| Mcmillan Leisure Ltd | Strathpeffer | A rating |
| McMillan Woods | SIDCUP | A rating |
| Mcmillan Woods Audits Limited | London | A rating |
| MCMULLAN FISHING COMPANY LTD | KIRCUBBIN | A rating |
| mcmullan odonnell | Dungannon | A rating |
| McMullan Shellfish | Ballymena | A rating |
| McMullen Facades Limited | Moira | A rating |
| McMullen's of Hertford Limited | Hertford | A rating |
| McMurtry Automotive Limited | Wotton-Under-Edge | A rating |
| MCN TRAILERS | MOUNTFIELD | A rating |
| McNab Eventing Limited | Guildford | A rating |
| McNaha Limited | Egham | A rating |
| McNathan Property Limited | Gloucester | A rating |
| MCP Consulting Group Ltd. | Solihull | A rating |
| MCP PLUS LTD | HERTFORDSHIRE | A rating |
| MCPL Ceramic Limited | Middlesex | A rating |
| MCQUAID ENGINEERING LTD | Dungannon | A rating |
| MCQUEEN'S MEDIA LTD | London | A rating |
| MCQUEENS DAIRIES LTD | GLASGOW | A rating |
| MCR 2022 LIMITED | Skelmersdale | A rating |
| MCR AUTO SERVICES LIMITED | MANCHESTER | A rating |
| Mcr Elite Running Ltd | Wigan | A rating |
| MCR ESTATES (NW) LTD | Manchester | A rating |
| MCR Food Kitchen LTD | Manchester | A rating |
| Mcr Halal Meat Ltd | Manchester | A rating |
| MCR Health Limited T/A Manchester Pharmacy and Health Clinic | Manchester | A rating |
| MCR National Homes Limited | Manchester | A rating |
| MCR SOLICITORS, | Manchester | A rating |
| MCR VAPING LTD | SALFORD | A rating |
| MCRA (U.K) Ltd. | London | A rating |
| MCRTrade Ltd T/A C.U.CCTV | Salford | A rating |
| MCS Corporate Strategies Ltd | Kenilworth | A rating |
| MCS Properties & Developments Ltd | Stockport | A rating |
| MCS Rental Software Limited | Maidenhead | A rating |
| MCS Test Equipment Ltd t/a Test Equity | St Asaph | A rating |
| McSence Communication Ltd | Dalkeith | A rating |
| MCT Engineering Limited | Daventry | A rating |
| MCT Partnership LLP | Harrow | A rating |
| McTear Williams & Wood Limited | Norwich | A rating |
| Mctears Gallery 1842 Ltd | Glasgow | A rating |
| MCTURK CATERING SUPPLIES LIMITED | Nottingham | A rating |
| MCTURK KEBABS LTD T/A McTurk Kebabs | Derby | A rating |
| Mcube Limited | Wimbledon | A rating |
| MCV Bus and Coach Limited | Sutton | A rating |
| MCV Global Ltd | Chesham, | A rating |
| MCWILD GROUP MANAGEMENT LTD | London | A rating |
| McWin Advisors UK Limited | London | A rating |
| McWood Property Management & Lettings Limited | Middlesbrough | A rating |
| MD CAR CARE HOUSE LTD | Dagenham | A rating |
| MD Convenience LTD | Atherton | A rating |
| MD CONVENIENCE STORE LIMITED | HALESOWEN | A rating |
| MD Foods Ltd | Southall | A rating |
| MD FOODS SERVICES LTD | Flackwell heath | A rating |
| MD FOODS SERVICES LTD | HIGH WYCOMBE | A rating |
| MD Healthcare LTD | Newtownards | A rating |
| MD Homes | Northwood | A rating |
| MD Leisure Ltd. | SHETLAND | A rating |
| MD Milne Limited | Edinburgh | A rating |
| MD MINI MARKET LTD | Liverpool | A rating |
| MD MIRUJ KHAN Trading as FELPHAM BAZAAR | Bognor Regis | A rating |
| Md Mohon Ahmed TA Surma Indian Takeway | Belfast | A rating |
| MD Property Holdings Ltd | London | A rating |
| MD Romsey Limited | Romsey | A rating |
| MD SECURITY SERVICES LTD | OLDHAM | A rating |
| MD SHAHIDUL ISLAM SUKUR T/A BARWELL INDIAN CUISINE | Leicester | A rating |
| MD STUDIO LIMITED | London | A rating |
| MD Tech & Management Ltd | London | A rating |
| MDA GROUP LTD | LONDON | A rating |
| MDA RPO Ltd t/a NL Recruitment | Egham | A rating |
| MDA SATCONN UK LTD | Hampshire | A rating |
| MDA Space and Robotics Limited | Didcot | A rating |
| MDD UK LLP | London | A rating |
| MDDS-UK RP Limited | Manchester | A rating |
| MDE Machinery Limited | COLLONE | A rating |
| MDF Auto Services Ltd T/S MDF AUTOSERVICES | Wokingham | A rating |
| MDF RECOVERY LIMITED | Beaumaris | A rating |
| MDFOODS LTD WALES CYF. | Pontypridd | A rating |
| MDG Transport Limited | Gravesend | A rating |
| MDH DEFENCE LIMITED | AMEBURY | A rating |
| MDI Networks Limited | Portsmouth | A rating |
| MDJ Homes Ltd | Rochester | A rating |
| MDJ Investments Limited | Addington | A rating |
| MDJ Investments Limited TA Dominos Pizza | West Malling | A rating |
| MDN GROUP LTD | UXBRIDGE | A rating |
| MDN Super Store Ltd | Portsmouth | A rating |
| MDNA Life Sciences (UK) Ltd | Newcastle Upon Tyne | A rating |
| MDOTM Ltd | London | A rating |
| MDP Catering Limited | Retford | A rating |
| MDPI UK LIMITED | Manchester | A rating |
| MDR SOLUTIONS LTD | Leatherhead, | A rating |
| MDRN-FX Services Limited T/A Alpha Transfers | London | A rating |
| MDS Aero Support Limited | Derby | A rating |
| MDS HEALTHCARE (CARE HOMES) LIMITED | Parbold, Wigan | A rating |
| MDS HEALTHCARE LIMITED | Preston | A rating |
| MDS Singh Ltd t/a Premier Convenience Store | Airdrie | A rating |
| MDS Testing Services Ltd | Ashburton | A rating |
| MDS Transmodal Ltd | Chester | A rating |
| MDSec Consulting Limited | Macclesfield | A rating |
| MDSOL Europe Ltd | Hammersmith | A rating |
| MDU Foods Ltd | Hove | A rating |
| MDV Enterprise Ltd | Birmingham | A rating |
| MDW Capital Partners LLP | London | A rating |
| MDX LOGISTICS LTD | Harrow | A rating |
| MDX Technology Limited | London | A rating |
| ME 1 ENTERPRISES LTD | London | A rating |
| ME 2 LONDON LIMITED | London | A rating |
| Me and Em Ltd | Wood Lane, London | A rating |
| Me and Mrs Jones (Portstewart) Limited | Portstewart | A rating |
| ME RETAIL SUPPLIES LTD T/A GREEN VALLEY | LONDON | A rating |
| Me-Mo Media LTD | Harefield | A rating |
| Me&U UK Trading Ltd | London | A rating |
| Mea Navis Ltd | Chipping Norton | A rating |
| Mead Medical Services Limited | Annan | A rating |
| Mead News Ltd | Dartford | A rating |
| MEADE-KING, ROBINSON & COMPANY LTD | LIVERPOOL | A rating |
| Meaden & Moore International LLP | London | A rating |
| MEADOW BROWN RESTAURANTS LIMITED | Clapham | A rating |
| Meadow Care Homes Ltd | Bristol | A rating |