| Monarch Solicitors Ltd | Manchester | A rating |
| Monarch Studios Limited | Peaslake | A rating |
| Monarchy Care Services LTD | Knaresborough | A rating |
| Monark Garments LTD | Manchester | A rating |
| Monark Limited | Harrogate | A rating |
| MONASH ENTERPRISES LIMITED | Ilford | A rating |
| Monashee International LLP | London | A rating |
| Monastery of Our Lady & Saint Joseph - Poor Clare Colettines | Ellesmere | A rating |
| Monaughty Bloodstock Limited T/A Barton Stud/Ickworth Stud | Bury St Edmunds | A rating |
| Monavate Holdings Limited | Duxford | A rating |
| MONAX INDUSTRIES LIMITED | London | A rating |
| MONBIT LIMITED | London | A rating |
| MONCLER (UK) LIMITED | London | A rating |
| MONDAQ LIMITED | Bristol | A rating |
| monday.com 2020 UK Ltd | London | A rating |
| MONDAYBLOOM LTD | Durham | A rating |
| Mondelez UK Limited | Middlesex | A rating |
| MONDELINK TRAVEL LIMITED | London | A rating |
| Mondi PLC | Weybridge | A rating |
| Mondial Wine Limited | Redhill | A rating |
| Mondo Intl. Limited | London | A rating |
| Mondols Trading Limited | London | A rating |
| Mondonovo Care Limited | Hackney London | A rating |
| Mondottica | Nottingham | A rating |
| Mondra Global Limited | London | A rating |
| MONDRELOG LTD | NEWARK | A rating |
| Mondrian Alpha Ltd | London | A rating |
| Mondrian Investment Partners Limited | London | A rating |
| Moneda Capital Asset Management Ltd | London | A rating |
| MONEDHA ACCOUNTING LTD | LONDON | A rating |
| Monet Beauty Clinic Limited | London | A rating |
| MONETARY AUTHORITY OF SINGAPORE | LONDON | A rating |
| Monex Europe Limited | LONDON | A rating |
| Money and Mental Health Policy Institute | London | A rating |
| MONEY BOX PROPERTY CONSULTANTS LTD | Stoke-On-Trent | A rating |
| Money Links International Ltd | Ilford | A rating |
| Money Means Limited | Hitchin | A rating |
| Money Ready | London | A rating |
| MONEYFEX LTD | Harlow | A rating |
| MoneyGram International SA UK Branch | London | A rating |
| Moneyhub Financial Technology Ltd | Bristol | A rating |
| Moneymatix LTD | Livingston | A rating |
| Moneynmore Technologies Limited | Reading | A rating |
| Moneytea Ltd | London | A rating |
| Mong & Jong Ltd | London | A rating |
| Mongas Kidswear Ltd | Southall | A rating |
| Monger Azure Ltd | London | A rating |
| Mongkok Catering LTD | Liverpool | A rating |
| MongoDB UK Limited | London | A rating |
| Mongoose Pictures Ltd | London | A rating |
| Mongoose Publishing Limited | Swindon | A rating |
| MONI GROUP LTD | Manchester | A rating |
| Moniack Mhor Writers' Centre | Inverness | A rating |
| MONICA SUPER STORE LTD | Birmingham | A rating |
| MONICA TIMPU CUNA T/A LIFESTYLE EXPRESS | Birmingham, | A rating |
| MONIEPOINT TECHNOLOGIES UK LTD | London | A rating |
| Moniepoint UK Limited | London | A rating |
| MONIHAR LTD | Ilford | A rating |
| Monijai Limited | London | A rating |
| MONIKA PALKA HOSPITALITY LTD T/A CREATIVE INDIAN KITCHEN | SANDBACH | A rating |
| MONIKA SPRUTH & PHILOMENE MAGERS LIMITED | London | A rating |
| Monir Ahmed B.Com. FCCA | London | A rating |
| MONISH KUMAR GANESAN T/A ST MARY'S CONVENIENCE STORE | Stirling | A rating |
| Monisha & Sabina Ltd trading as Pipasha | Cambridge | A rating |
| MONITOR AUDIO LTD | Rayleigh | A rating |
| Monitor Computer Systems | YORK | A rating |
| Monitor Ltd | Eton Wick | A rating |
| Monitor Systems Scotland Limited | Aberdeen | A rating |
| Monitox Limited | London | A rating |
| Monitra Ltd | Salford, UK | A rating |
| Monitronics Limited | London | A rating |
| Monivolt LTD | London | A rating |
| Monkey Barrel Comedy Ltd | Edinburgh | A rating |
| Monkey Puzzle Day Nursery, Surbiton | Surbiton | A rating |
| Monkey Puzzle Stoke Newington Day Nursery | London | A rating |
| Monkey World Limited | Wareham | A rating |
| Monkfield Nutrition Ltd | Cambs | A rating |
| MONKLAN LTD | Peckham | A rating |
| Monkmoor Dental Practice Limited | Shrewsbury | A rating |
| Monks Newsagents | Manchester | A rating |
| Monks Walk School | Welwyn Garden City | A rating |
| Monkschem Limited T/A Monks Chemist | Middlesex | A rating |
| Monkton Combe School | Bath | A rating |
| Monmedical Limited (t/a Cinapsis) | London | A rating |
| MONMORE CONFECTIONERY (MIDLANDS) LIMITED | Bilston | A rating |
| Monmos 786 Limited | Derby | A rating |
| Monmouth DBF | Newport | A rating |
| Monmouthshire County Council | Usk | A rating |
| Monmouthshire Housing Association | Mamhilad | A rating |
| Monmouthshire Limited TA The Kings Head Hotel | Abergavenny | A rating |
| Monnington Morgans | Hereford | A rating |
| MONO LONDON LTD | LONDON | A rating |
| Monochrome Global Ltd | Wolverhampton | A rating |
| Monocle Solutions Ltd | London | A rating |
| Monocon International Refractories Ltd | Doncaster | A rating |
| Monodraught Ltd. | High Wycombe | A rating |
| Monofloor Technology Ltd | Ivybridge | A rating |
| Monohill Limited | London | A rating |
| Monohon Ramen Ltd | London | A rating |
| MONOLITH (UK) LTD | London | A rating |
| Monolithic Refractories Limited | Neath | A rating |
| Monopo London Ltd | United Kingdom | A rating |
| Monopro Limited | London | A rating |
| Monortrading Ltd | London | A rating |
| MONOTYPE LTD | London | A rating |
| Monow International Limited | London | A rating |
| Monoworld Recycling Ltd | Rushden | A rating |
| Monpure Limited | London | A rating |
| Monq Ltd | London | A rating |
| MONREAL SHAW LIMITED | London | A rating |
| Monro Limited | Coalville | A rating |
| Monroe Partners Limited | London | A rating |
| MONS FROMAGER-AFFINEUR LTD | London | A rating |
| Monsac (UK) Limited T/A Alma Home | London | A rating |
| Monsell Pharmacy | Leicester | A rating |
| MONSERRATE LTD | Brighton | A rating |
| MONSIEUR LTD | Essex | A rating |
| Monsoon (MM) Limited | Birmingham | A rating |
| Monsoon Hospitality NI Limited | Belfast | A rating |
| Monsoon Impex UK Limited | London | A rating |
| MONSOON INDIAN CUISINE LIMITED | Filey | A rating |
| MONSOON INDIAN DINING LIMITED | Lancing | A rating |
| MONSOON LIMITED | Manchester | A rating |
| Monster Energy Europe Limited | Greenford | A rating |
| Monster Group (UK) | York | A rating |
| Monster Payroll LLP | York | A rating |
| Monster Tattoo Supplies Ltd | Bolton | A rating |
| Mont Rose College of Management and Sciences | Ilford | A rating |
| Monta Platform Ltd | London | A rating |
| Montad Limited t/a Cargo Express | Birmingham | A rating |
| MONTAGU EVANS LLP | London | A rating |
| Montagu Full Potential Partners LLP | London | A rating |
| Montagu Off Licence Limited | Kettering | A rating |
| Montagu Partners Limited | Ross-On-Wye | A rating |
| Montagu Private Equity LLP | London | A rating |
| Montagu West LTD trading as FIFTEEN WEST | ROYSTON | A rating |
| Montague Parr Ltd | Rochester | A rating |
| Montague Spice Limited | Dunstable | A rating |
| Montague Square Advisors Limited | London | A rating |
| MONTAGUE STORE LTD | WORTHING | A rating |
| Montalbano Restaurant | Tenterden | A rating |
| Montalto Properties Limited | Ballynahinch | A rating |
| MONTANA BAKERY LTD | SLOUGH | A rating |
| Montane Ltd. | Ashington | A rating |
| Montash Limited | London | A rating |
| Montaz Limited T/A Montaz | Cambridgeshire | A rating |
| Montaze Broz LTD | Rickmansworth | A rating |
| Montblanc Consulting Ltd | Edinburgh | A rating |
| Montcalm (RLH) Ltd | London | A rating |
| Montcalm Hotel (London) Ltd | London | A rating |
| MONTCLARES INTERNATIONAL LTD | Ilford | A rating |
| MONTE Global Asset Management Limited | London | A rating |
| Monte Hotels Ltd | Blackburn | A rating |
| Monte Laguna 2 Limited TA Domino's Pizza | Chertsey | A rating |
| Monte Laguna Limited TA Domino's Pizza | Chertsey | A rating |
| Monteacute House Limited | London | A rating |
| Monteiro Dental Clinic | London | A rating |
| Monteith Personal Care Monteith Limited | Edinburgh | A rating |
| Monteiths - Compass (Edinburgh) Ltd | Edinburgh | A rating |
| MONTELEONE LIMITED | Glasgow | A rating |
| Monterosa Productions Ltd | Liverpool | A rating |
| Monterosso Polo Team | Windsor | A rating |
| MONTERRO UK LTD | Birmingham | A rating |
| Montesano Care Ltd | Hove | A rating |
| MONTESSORI COMMUNITY SCHOOL | London | A rating |
| Montessori Education for Autism | London | A rating |
| Montessori Methods Ltd. | Edinburgh | A rating |
| Montfort Communications Ltd | London | A rating |
| MONTFORT ESTATES LTD | England, | A rating |
| Montfort Missionary Society | LONDON | A rating |
| Montgomery Advisory Ltd | Newton Mearns | A rating |
| Montgomery House Surgery | Bicester | A rating |
| Montgomery Waters Limited | Montgomery | A rating |
| MONTGOMERY WHOLESALE FRUIT AND VEG LIMITED | London | A rating |
| Montieth & Company Global PR Limited | London | A rating |
| MONTIREX LTD | Speke | A rating |
| Montis Care Ltd | Waterlooville | A rating |
| Montmartre (Whitby) Limited | Whitby | A rating |
| MONTNEY LIMITED T/A LIGHT OF BENGAL | Hampshire | A rating |
| Monton Medical Practice | Eccles | A rating |
| Monton Sports Club | Manchester | A rating |
| Montpelier Health | Bristol | A rating |
| Montpeliers (Edinburgh) Ltd | EDINBURGH | A rating |
| Montpellier Public Relations Limited | Cheltenham | A rating |
| Montreal Dental Care | Leeds | A rating |
| MONTREAL GROUP LTD | BOLTON | A rating |
| Montreal Prestige Ltd | Bolton | A rating |
| Montrose Food & Wine Limited | Doncaster | A rating |
| MONTROSE RETAIL LTD | PRESTWICK | A rating |
| Montrose Specsavers Limited | Montrose | A rating |
| Montu Pharmaceutical Ltd | Wokingham | A rating |
| Monty Tyres | Bolton | A rating |
| Monty UK Global Limited | London | A rating |
| Monty's Bakehouse UK Limited | South Nutfield | A rating |
| MONTY'S BROADWAY LIMITED | London | A rating |
| Montys Tropical Rags Limited | Birmingham | A rating |
| Monu Valley Ltd | Southsea | A rating |
| Monument Bank Limited | London | A rating |
| Monument Group Europe LLP | London | A rating |
| Monument Leisure (Holdings) Limited | Grangemouth | A rating |