| NIS Convenience Store Ltd | Southampton | A rating |
| NIS HARDWARE LIMITED | Milton Keynes | A rating |
| Nisa | Glasgow | A rating |
| NISA CORNER LTD | Romford | A rating |
| Nisa Day One | London | A rating |
| NISA DUNVANT LIMITED | Dunvant | A rating |
| Nisa Local | London | A rating |
| Nisa Local | Maidstone | A rating |
| Nisa Local | Corwen | A rating |
| Nisa Local | Cambridge | A rating |
| Nisa Monkton | Ryde | A rating |
| Nisa Premium Fashion Ltd | Preston | A rating |
| Nisa Stores Ltd | Liverpool | A rating |
| Nisa's Homemade Recipes Ltd | London | A rating |
| NISAA ONLINE LIMITED | Bradford | A rating |
| Nisacraftcare Limited | Stanmore | B rating |
| Nisanthan Rasu T/A Express Corner | Ellesmere Port | A rating |
| Nisar Ahmed T/ A Impressions Hair Salon | Nelson | A rating |
| NISAR BUTCHERS LIMITED | London | A rating |
| Nisbets Plc | Bristol | A rating |
| NISH COSMETICS UK LTD | STOCKPORT | A rating |
| NISH D THRIKAWALA T/A THE VILLAGE STORE EXPRESS | WIRRAL | A rating |
| Nish Infotech Ltd | Orpington | A rating |
| Nish Retail Ltd | Chertsey | A rating |
| Nisha Enterprises Ltd | Livingston | A rating |
| Nisha Express Limited | Northolt | A rating |
| Nisham Properties Ltd | Glasgow | A rating |
| nishanthini ltd | Rhyl | A rating |
| NISHANTHY MATHIRUPAN AND MATHIRUPAN MAKALINGAM T/A M.R.N STORE - PREMIER | IPSWICH | A rating |
| Nishara Food and Wine Ltd | Yarm | A rating |
| NISHI SUSHI LTD | Chorley | A rating |
| NISHIHARA SHOKAI UK LTD. | London | A rating |
| Nishikawa Rubber Co. Ltd. | Coventry | A rating |
| Nishimura & Asahi UK Limited | London, England | A rating |
| Nishkam School Trust | Birmingham | A rating |
| Nishkkalaa Technologies Ltd | Reading | A rating |
| Nishura Ltd. | London | A rating |
| Nisos Group Limited | Belfast | A rating |
| NISSA CONSULTANTS LTD | Romford | A rating |
| Nissan Motor (GB) Limited | Rickmansworth | A rating |
| Nissan Motor Manufacturing (UK) Ltd | Sunderland | A rating |
| Nissan Trading Europe Ltd. | Sunderland | A rating |
| NISSI LIFE CHURCH | LONDON | A rating |
| NISSIN (U.K.) LIMITED | West Drayton | A rating |
| Nissin (U.K.) Ltd. | West Drayton | A rating |
| NISSIOASIS LTD | LONDON | A rating |
| Nistad LTD | London | A rating |
| Nisus International Logistics Limited | London | A rating |
| Nitec Solutions Ltd | Antrim | A rating |
| NITH LTD | Barking | A rating |
| NITHBANK LTD | Dumfries | A rating |
| Nithilam Entrepreneurs Ltd | Milford Haven | A rating |
| NITHIN EXPRESS LTD | SUFFOLK | A rating |
| NITHREE TECHNOLOGY LIMITED | Reading | A rating |
| NITHU & LATHU LTD | Derbyshire | A rating |
| Nithu Sanu Ltd | London | A rating |
| NITHUSH LIMITED | Liverpool | A rating |
| Nithy Convenience Limited t/as Dean Bank Convenience Store | FERRYHILL | A rating |
| Nithy Ltd | Newcastle Upon Tyne | A rating |
| Nithy Retail Ltd | Darlington | A rating |
| Nithy Retails UK Ltd | Lincoln | A rating |
| NITINJOSU PRIVATE LIMITED TA DELHI WALA FOOD | Leeds | A rating |
| Nitron Racing Systems | Witney | A rating |
| NitroPOS Solutions | Paisley | A rating |
| NITS Solutions Limited | Stanmore | A rating |
| Nittan Europe Limited | Surrey | A rating |
| NITTYA FOOD AND WINE LIMITED | ERITH | A rating |
| NITTYAA INTERNATIONAL LTD | Crockenhill | A rating |
| Nittyaa Trading Ltd | Tunbridge Wells | A rating |
| NITTYO BAZAAR LTD | Ilford | A rating |
| NITYA INTERNATIONAL LTD | HENDON | A rating |
| Nityam Ltd T/A Nityam Superstore | Leicester | A rating |
| Nityo Infotech Ltd | Reading | A rating |
| Nityug UK limited | Tadworth | A rating |
| Nium Fintech Ltd | London | A rating |
| NIVA (UK) LIMITED | London | A rating |
| Niva Retails Ltd | Fareham | A rating |
| NIVAAZ SERVICES LIMITED | Uxbridge | A rating |
| Nivalo Care Services | Chelmsford | A rating |
| Niveda Group Ltd | London | A rating |
| NIVISHA EXPRESS LTD T/A TEXACO | Builthwells | A rating |
| NIVO MANAGEMENT LIMITED | Huntingdon | A rating |
| Nivo Solutions Limited | Wilmslow | A rating |
| Nivtar Distribution Limited | Duxford | A rating |
| NIX TECHNOLOGY UK LTD | Birmingham | A rating |
| Nixon Cathodic Protection Services Ltd | Whitley Bay | A rating |
| Nixon Properties | CHESTER | A rating |
| Nixon Security Services Limited | Reading | A rating |
| Nixplay UK Limited | Plymouth | A rating |
| Nixxe Trader Limited | Birmingham | A rating |
| Niya Network LTD | London | A rating |
| Niyamo Capital UK Ltd | London | A rating |
| Niyanth Media & Technology Limited | Southall | A rating |
| Niyis Ltd | Reading | A rating |
| NIYYAT ENTERPRISES LTD | Barking | A rating |
| Niza Enterprises Ltd | Sutton | A rating |
| NIZA FORECOURT LTD T/A TEXACO | Wickford | A rating |
| NIZA SOUTHWATER LTD | Horsham West | A rating |
| Niza Superstores (Eastbourne) Ltd | Sutton | A rating |
| Nizam Indian Restaurant Limited | Haywards Heath | A rating |
| NJ & SONS CONSTRUCTIONS LTD | Watford | A rating |
| NJ COFFEE LTD TA FLAVOUR PALACE | England | A rating |
| NJ DEVELOPMENT AND CONSTRUCTION LTD | London | A rating |
| NJ DIGITAL SOLUTIONS LTD | Ilford | A rating |
| NJ Garments Ltd | Manchester | A rating |
| NJ SUPPLIERS LIMITED | Wirral | A rating |
| NJBB Limited t/a Ernevale House Dentistry | Spalding | A rating |
| NJC Europe Limited | Oldham | A rating |
| NJC Labs Limited | Wokingham | A rating |
| NJD Group Bars Limited | burton on trent | A rating |
| Njfield LTD | London | A rating |
| NJIW Limited t/a The English Vine | Chelmsford | A rating |
| NJM Ventures Limited | Peterborough | A rating |
| Njord Partners LLP | Reading | A rating |
| Njord Survey Ltd | Leamington Spa | A rating |
| NJR Trading Ltd T/A Tonic Bar | Edinburgh | A rating |
| NK & FAMILY LIMITED T/A PREMIER STORES | BIRCHINGTON | A rating |
| NK Accounts Ltd | Glasgow | A rating |
| NK ASHFORD LTD | Ashford | A rating |
| NK Broadwater Mini Market Ltd | Worthing | A rating |
| NK BUILDING CONTRACTORS (B'HAM) LTD | Birmingham | A rating |
| NK COATINGS LTD | Belfast | A rating |
| NK Computer Services Limited | London | A rating |
| NK Everest Limited | Edinburgh | A rating |
| NK Fencing Limited | Carrickfergus | A rating |
| NK GAS AND HEATING LIMITED | London | A rating |
| NK IMPORT CARS LTD | WRAYSBURY | A rating |
| NK2N HOTELS (GLASGOW) LIMITED | Dundee | A rating |
| NKB & Associates U.K. Limited | Bedford | A rating |
| NKC Conveyors (UK) Ltd | Milton Keynes | A rating |
| NKD MEDICAL LIMITED | LONDON | A rating |
| NKD Rathnam Trading Ltd (T/A Chorley Old Road Convenience Store) | Bolton | A rating |
| NKLA Healthcare Limited | Emsworth | A rating |
| NKM ASSOCIATES LTD | Hayes | A rating |
| NKM Bristol Ltd | BRISTOL | A rating |
| NKM ENTERPRISE LIMITED | Southampton | A rating |
| NKN Retails Ltd | Sittingbourne | A rating |
| nkoda Limited | London | A rating |
| NKRISH LIMITED | Newport | A rating |
| NKrush Ltd | London | A rating |
| NKS FOOD AND WINE LTD | Eastham, London | A rating |
| NKS FOODS LTD | Luton | A rating |
| NKS LEGAL LTD | Coventry | A rating |
| NKS LONDON LIMITED | London | A rating |
| NKS Supermarket Limited | Grays, Essex | A rating |
| NKT HVC Limited | Redcar | A rating |
| NKT PHOTONICS LTD | Southampton | A rating |
| NKV Compliance Limited | Harrow | A rating |
| NL Clinic | London | A rating |
| NL Group Limited t/a NLG Health | Hull | A rating |
| NL Home Care LTD | London | A rating |
| NL Technologies Limited | Isleworth | A rating |
| Nl145 LTD | Newport | A rating |
| NLB CORP. | Darlington | A rating |
| NLC Capital Manco Limited | London | A rating |
| NLC Capital Partners LLP | London | A rating |
| NLH EXPRESS LIMITED | Crewe, Cheshire | A rating |
| NLI Operator Ltd | London | A rating |
| nLighten UK Opco Limited | Chester | A rating |
| nlyte Software Limited | London | A rating |
| NM & Co Accountants Ltd | Salford | A rating |
| NM ASCEND INC LIMITED T/A THE FABRIC STRATEGY | London | A rating |
| NM Five Group Limited t/a August | London | A rating |
| NM Food Shop Ltd | Glasgow | A rating |
| NM Health Innovations | Chorley | A rating |
| NM HOME HEALTHCARE LTD | London | A rating |
| NM Software Solutions Ltd | Newcastle Upon Tyne | B rating |
| NM TAVY LTD t/a The Ganges | Tavistock | A rating |
| NMA (UK) Limited T/A Freshgo Food and Wine | London | A rating |
| NMA RETAIL LTD | Leatherhead | A rating |
| NMB MINEBEA UK LTD | LINCOLN | A rating |
| NMC ACCOUNTANTS LTD LIMITED T/A NMC ACCOUNTANTS & TAX ADVISORS & TAX ADVISORS | Chatham | A rating |
| NMC ENERGY LTD | Aberdeen | A rating |
| NMC Haulage Ltd | Dungannon | A rating |
| NMC Midlands Ltd. (operating as MD Support Centre) | Coventry | A rating |
| NMD MARKETING LTD | Lewes | A rating |
| NMedia Systems Ltd | Amersham | A rating |
| NMG Financial Services Consulting Limited | London | A rating |
| NMHL Ltd | London | A rating |
| NMIBLE LTD | Harrow | A rating |
| NMK Motors Limited | Grays | A rating |
| NMK Steel Ltd | Magherafelt | A rating |
| NML Solutions Ltd | Toomebridge | A rating |
| NMPO LOCAL | Weltham Green, Hatfield | A rating |
| NMR CLAPHAM LTD | London | A rating |
| NMR GROUNDS LTD | LONDON | A rating |
| NMR WEST SUSSEX LIMITED | Chichester | A rating |
| NMS Catering Limited | Bedford | A rating |
| NMT Developments Ltd | Asplxey Guise | A rating |
| NN BHATTI CONSTRUCTION LIMITED | Northwood | A rating |
| NN FASHIONS LTD | Manchester | A rating |
| NN FREIGHT LTD | Hounslow | A rating |
| NN Glazing Limited | Southall | A rating |
| NN Liverpool Ltd | Bold street Liverpool | A rating |
| NN MANCHESTER LIMITED | Manchester | A rating |
| NNA Limited T/A KFC | Gloucester | A rating |
| NNA UK Pvt Ltd | Bridgend | A rating |
| NNAVEED & CO LIMITED | Birmingham | A rating |
| NNDev Limited T/As Manor Dental Practice | Bath | A rating |
| NNJ Enterprise Limited | Manchester | A rating |