| Napier Sterling Law Limited | LONDON | A rating |
| Napier Technologies Limited | London | A rating |
| Napo Ltd | London | A rating |
| Napoleat | Cambridge | A rating |
| Napoleons Leisure Limited | London | A rating |
| NAPOLI CLOTHING LIMITED | Manchester | A rating |
| Napoli Estates | London | A rating |
| NAPOLI NEL CUORE RESTAURANT | leeds | A rating |
| Napoli Stores Limited | London | A rating |
| NAPOLITA GOURMET LTD | Bristol | A rating |
| NAPORA RESTAURANTS LTD | Leicester | A rating |
| Napthens LLP | Preston | A rating |
| Naqshi Dabka Ltd | Manchester | A rating |
| NAR BEAUTY & WELLNESS LTD | Coventry | A rating |
| Nar Convenience Ltd | Willenhall | A rating |
| Nara Healthcare Limited trading as Tudor House | Bognor Regis | A rating |
| Nara Media Limited | London | A rating |
| NARA SOLICITORS LTD | London | A rating |
| NARAN Ltd | Grantham | A rating |
| Narayan Supermarket Limited T/A | Caister On Sea | A rating |
| Narayani3 Ltd T/A Polski Sklep (Biala Roza) | London | A rating |
| Narayanswarup (UK) Limited | Enfield | A rating |
| Narborough Store Limited | Narborough | A rating |
| Nardello & Co LLP | London | A rating |
| Nardulli Ltd | London | A rating |
| NARIKEN APARTMENTS LTD | LONDON | A rating |
| NARIYAL LTD t/a HATHI | Nutley | A rating |
| Narkissos ltd | leeds | A rating |
| Narla Technologies Ltd | Newcastle | A rating |
| NARMADHA EXPRESS | Tilbury | A rating |
| Narmico Consulting Servics ltd. | Kings Hill | A rating |
| Narrativ Ltd | Kingston Upon Thames | A rating |
| NARRATOLOGY MARKETING LIMITED | Woking | A rating |
| Narrow Water Castle | Co Down | A rating |
| NART Retail Ltd T/A Norwich Shopper | Norwich, Norfolk | A rating |
| Narthex Sparkhill | Birmingham | A rating |
| NARTI2021 LTD T/A THE NEST | WEMBLEY | A rating |
| NARTIO LIMITED | London | A rating |
| NARU BUSINESS LTD T/A SUBWAY | PAISLEY | A rating |
| Narula Limited T/A Tikka Nation | London | A rating |
| NARUTER LIMITED T/A Korean Restaurant London Naru | London | A rating |
| Narvar UK Limited | London | A rating |
| Narwal UK Limited | London | A rating |
| Narwhal Group Limited | Bristol | A rating |
| Narz Ltd | Macclesfield | A rating |
| Nas Distributions Limited | Hayes | A rating |
| NAS International Ltd | London | A rating |
| Nas Investments UK Ltd | Surrey | A rating |
| Nasa Consulting Ltd | Bristol | A rating |
| NASA Design Studio Ltd | Birmingham | A rating |
| Nasadimalik LTD T/A Namji Xscape | Milton Keynes | A rating |
| Nasar & Co Trading Ltd | Gwent | A rating |
| Nasb Limited | Edgware | A rating |
| Nasbiz Ltd | Crawley | A rating |
| Nascent Group Ltd | London | A rating |
| Nascent Semiconductor | Durham | A rating |
| Nasco UK Ltd | Southall | A rating |
| NASDAQ International Limited | London | A rating |
| Nasdaq Limited | London | A rating |
| NASEEB LONDON LIMITED | London | A rating |
| NASEEB LTD | BIRMINGHAM | A rating |
| NASEEM PROPERTIES LTD | LONDON | A rating |
| Naseema Dental Supplies Limited T/A Naseema Dental | London | A rating |
| Nash Alliance Ltd | CORINIUM AVENUE | B rating |
| Nash Care Homes Ltd | Redhill | A rating |
| NASH CORPORATE SERVICES LIMITED | Rhyl | A rating |
| Nash Homecare Ltd | HEMEL HEMPSTEAD | A rating |
| Nash Supermarket T/A Daily Local | Halesowen | A rating |
| Nash Technologies and Consulting Limited | Birmingham | A rating |
| Nasha Foods Ltd T/A Shayona Sweets & Savouries | London | A rating |
| NASHE LIMITED COMPANY LIMITED | Leicester | A rating |
| Nashi Limited | London | A rating |
| NASHKARUKA PROPERTIES LTD | Batley | A rating |
| NASHLEY SOLUTIONS LTD | London | A rating |
| NASHRA FASHION LIMITED | London | A rating |
| NASHTAWALA LIMITED | Leicester | A rating |
| NashTech Limited | London | A rating |
| NASI ISDA LTD | ESSEX | A rating |
| Nasi Isda Woodford Ltd | London | A rating |
| Nasim & Co. Solicitors Limited | London | A rating |
| Nasim Consulting Limited | Ebbw Vale | A rating |
| Nasim Family Limited | Mitcham | A rating |
| NASIR AUTO LTD | Levenshulm | A rating |
| NASIR IFTEKHAR & CO LIMITED | London | A rating |
| NASIR MARKETING (UK) LIMITED | Birmingham | A rating |
| NASIRY LTD | London | A rating |
| NASKAM COMMUNITY INTEREST COMPANY | Nottingham | A rating |
| Naspram Pharma Limited T/A Aqua Pharmacy | London | A rating |
| NASRUL-LAHI-L-FAITH SOCIETY OF NIGERIA (MANCHESTER CENTRAL) ENGLAND | MANCHESTER | A rating |
| NASRULLAH LIMITED | PRESTON | A rating |
| NASSH HEALTHCARE LTD | DERBY | A rating |
| NASUNI UK LITD | OXFORDSHIRE | A rating |
| NASUWT | Birmingham | A rating |
| NASYA HEALTH LIMITED | HIGH WYCOMBE | A rating |
| Nat Tech Holdings UK Ltd | London | A rating |
| Nat's Tutorial Limited | LONDON | A rating |
| Natalia Miyar Limited | London | A rating |
| Natara Global | Hartlepool | A rating |
| Natasha Foods Limited T/A NATASHA FOODS | Leicester | A rating |
| Natatomisam Limited | Exeter | A rating |
| Natco Foods Limited | Buckingham | A rating |
| Nath and Sons UK Ltd | Cambridge | A rating |
| Nath Associates Limited | Nottingham | A rating |
| NATHAN AARON SOLICITORS | LONDON | A rating |
| NATHAN AND SONS LTD | Dunstable | A rating |
| Nathan Maysey and Claire Thomas t/a Lindum House | Swindon | A rating |
| NATHANIEL CAR SALES LIMITED | Bridgend | A rating |
| Nathaniel Lichfield & Partners Ltd | London | A rating |
| NATHASUBYNA RAJASUTHAN T/A VILLA GROCERIES | London | A rating |
| Natheesvaran Varatharasa T/A NKN Store | Bedminster | A rating |
| Natilik Limited | City Of London | A rating |
| NATION FRESH FOODS LTD | Grantham | A rating |
| Nation News Two | Sheffield | A rating |
| Nation WIlcox Systems Ltd. | Sutton Coldfield | A rating |
| Nation.better | London | A rating |
| National Accident Support Line | London | A rating |
| National Anthem Ltd | London | A rating |
| National Army Museum | London | A rating |
| National Art Collections Fund | London | A rating |
| National Audit Office | London | A rating |
| National Australia Bank Ltd | London | A rating |
| NATIONAL AUTO SOLUTIONS LTD | Derby | A rating |
| National Bank Financial Inc. | London | A rating |
| National Bank of Canada | London | A rating |
| NATIONAL BANK OF EGYPT (UK) LIMITED | LONDON | A rating |
| National Bank of Kuwait International PLC | London | A rating |
| National Blinds Limited | Sheffield | A rating |
| National Boiler Specialist Ltd | Wembley | A rating |
| NATIONAL BUSINESS SOLUTIONS LTD | Bradford | A rating |
| National Care Holdings Ltd | London | A rating |
| NATIONAL CARE PROVIDERS LTD | Derby | A rating |
| National Centre for Circus Arts | London | A rating |
| National Centre for Social Research | London | A rating |
| National Children's Bureau | London | A rating |
| National Composites Centre | Emersons Green | A rating |
| National Corporate Housing UK Ltd | London | A rating |
| National Council for Christian Standards in Society | Carmarthen | A rating |
| National Council of Civil Liberties | London | A rating |
| National Council of YMCA's | Newcastle | A rating |
| National Council of Young Men's Christian Associations (INCORPORATED) (THE) T/A YMCA | London | A rating |
| National Counties Building Society | Epsom | A rating |
| National Courier & Logistics Ltd | London | A rating |
| National Crime Agency | London | A rating |
| National Dance Company Wales | Cardiff | A rating |
| National Dental Limited | Beaminster | A rating |
| NATIONAL DISTRIBUTION LIMITED | Braintree | A rating |
| National Education Group Ltd | Sheffield City Centre | A rating |
| National Education Union (NEU) | London | A rating |
| National Energy Solutions Ltd | Derby | A rating |
| NATIONAL ENERGY SYSTEM OPERATOR LIMITED | Sindlesham | A rating |
| National Express Limited | Birmingham | A rating |
| National Farmers Union of England and Wales | Stoneleigh | A rating |
| NATIONAL FM SERVICES LTD | Gateshead | A rating |
| National Fostering Group Limited | Bolton | A rating |
| National Foundation for Educational Research in England & Wales | Berkshire | A rating |
| National Gas Transmission plc | Warwick | A rating |
| National Glazing UK Limited | Ilford | A rating |
| National Grid Electricity Distribution (South West) plc | Bristol | A rating |
| National Grid plc | Warwick | A rating |
| National Highways | Birmingham | A rating |
| NATIONAL HOMES CIC | Birmingham | A rating |
| National House-Building Council | Milton Keynes | A rating |
| National Institute for Health and Care Excellence | Manchester | A rating |
| National Institute of Economic and Social Research | London | A rating |
| National Instruments Corporation (UK) Ltd | Reading | A rating |
| NATIONAL IT DISPOSAL LIMITED | MANCHESTER | A rating |
| National Learning Group | Hexham | A rating |
| National Library of Wales | Aberystwyth | A rating |
| National Logistics group Ltd | London | A rating |
| National Magazine Company Limited | London | A rating |
| National Milk Record Plc | Chippenham | A rating |
| National Museum of the Royal Navy | Portsmouth | A rating |
| National Museum Wales | Cardiff | A rating |
| National Museums NI | Holywood | A rating |
| National Museums Scotland | Edinburgh | A rating |
| National Neurological Services | Accrington | A rating |
| National Oceanography Centre | Southampton | A rating |
| National Oilwell Varco UK Limited | Aberdeen | A rating |
| National Opera Studio | London | A rating |
| National Skirting limited | LEICESTER | A rating |
| National Spiritual Assembly of the Baha/is of the UK | London | A rating |
| National Star Foundation | Cheltenham | A rating |
| NATIONAL STEM EDUCATION LIMITED | Birmingham | A rating |
| National Stud Limited | Newmarket | A rating |
| NATIONAL SUPPLY CHAIN NETWORKS UK LTD | Birmingham | A rating |
| National Theatre of Scotland | Glasgow | A rating |
| National Theatre Wales | Cardiff | A rating |
| National Transport Ltd | Slough | A rating |
| National Unplanned Pregnancy Advisory Service Limited | Birmingham | A rating |
| NATIONAL VETERINARY SERVICES LIMITED | Stoke-on-Trent | A rating |
| National Waiting Times Centre Board | Glasgow | A rating |
| National Wealth Fund Limited | Leeds | A rating |
| National Web Design Ltd | Croydon | A rating |
| National Workforce Ltd | York | A rating |
| National Youth Advocacy Service | Birkenhead | A rating |
| National Youth Arts Trust | Farnborough | A rating |
| Nationbuilders Capital Partners LLP | London | A rating |
| NATIONS EVERYWHERE LTD | Kent | A rating |
| Nations Pride Limited | Bradford | A rating |
| Nations Trust | Llanelli | A rating |