| Nightingale Residential Care Home Ltd | Romford | A rating |
| Nightingale Services | Newport Pagnell | A rating |
| NIGHTINGALE YORKSHIRE LTD | LEEDS | A rating |
| Nightingales Community Care Ltd | Stockton-on-tees | A rating |
| Nightingales Nursing Home Limited | Leicester | A rating |
| Nightingales Recruitment Care Agency Ltd | Warwick | A rating |
| Nigon Trading Limited | Edgware | A rating |
| NIH Clinics Limited | Sparsholt | A rating |
| Niha Cuts & Beauty Ltd | London | A rating |
| Nihal Healthcare Ltd | Colchester | A rating |
| Nihal M8 Ltd t/a Aby's | Bolton | A rating |
| Nihas Ltd | Bolton | A rating |
| Nihilent Limited | London | A rating |
| Nihon Cyber Defence Ltd | Belfast | A rating |
| Nihon Shipyard UK Ltd | London | A rating |
| NIHON SHOKKEN HOLDINGS CO., LTD. | London | A rating |
| Nihonbo Limited | Godalming | A rating |
| Nihude Services Ltd | Newcastle Upon Tyne | A rating |
| Nii HAi Ltd | London | A rating |
| Niico Ltd | London | A rating |
| Niippon Sanso UK Limited | Immingham | A rating |
| NIIT Limited UK | London | A rating |
| Nijjar Property Limited | Camberley | A rating |
| Nijjar Supermarket Ltd T/A Nijjar's Supermarket | Wolverhampton | A rating |
| Nijjar Transport (Slough) Limited | Slough | A rating |
| Nijjer Accountants Limited | Longfield | A rating |
| NIJJER SPAR OFFLICENCE LIMITED | Coventry | A rating |
| NIJJERCO LTD | Hitchin | A rating |
| NIJO CONSTRUCTION LTD | England | A rating |
| NIK PHARMA LTD | CARDIFF | A rating |
| NIK SHIPPING AND LOGISTICS LTD | London | A rating |
| Nika Global Ltd T/A Nika Care | Uxbridge | A rating |
| Nikadi Group Limited | Wrexham, | A rating |
| Nikan Group Ltd T/A OptraFi Solutions | London | A rating |
| Nikao Technology Limited | London | A rating |
| Nikdan Ltd T/A The Gateway Express | LEEDS | A rating |
| Nike Retail UK | London | A rating |
| NIKETON PAYROLL SERVICES LIMITED | Birmingham | A rating |
| NIKHATA LIMITED | Doncaster | A rating |
| NIKI ENTERPRISE LTD TA / GRAYWELL LOCAL STORE | HAVANT | A rating |
| Nikila Santhakumar T/As Fruit Bowl | Morden | A rating |
| NIKILAN FOODS LTD | REDDITCH | A rating |
| NIKITA OPS LIMITED T/A NIKITA | LONDON | A rating |
| NIKITHA LTD | Me Pontyclum | A rating |
| Nikkei Europe Limited | London | A rating |
| Nikken Kosakusho Europe Ltd | Rotherham | A rating |
| Nikki Local Store Ltd T/A AKN Superstore | Coventry | A rating |
| Nikkiso Medical UK Limited | Acton | A rating |
| NIKODA CARE SERVICES LTD | Gillingham | A rating |
| Nikolaz Services Ltd | London | A rating |
| Nikon Metrology UK Ltd | Derby | A rating |
| Nikon Optical UK Limited | Milton Keynes | A rating |
| Nikon Precision Europe GmbH | Dunfermline | A rating |
| Niks Local Ltd | Dundee | A rating |
| Niku Bar & Restaurant | Surbiton | A rating |
| NIKUNJO UK LTD | Horsham | A rating |
| NIKURA LIMITED | London | A rating |
| Nila Care Group Limited | London | A rating |
| NILA CONVENIENT STORE | Dover | A rating |
| NILA ESTATES LTD | HARROW | A rating |
| Nilas Stores Ltd T/A Family Shopper | guidepost | A rating |
| NILCA LIMITED | KENT | A rating |
| NILE & ATLAS LTD | London | A rating |
| NILE LIVING SERVICES LTD | Birmingham | A rating |
| Nile UK Service Company Ltd | London | A rating |
| Nile Wilson Gymnastics | Melksham | A rating |
| NILKANTH EXPRESS SUPERSTORE LTD | LONDON | A rating |
| NILKANTH LIMITED | RAINHAM | A rating |
| NILKANTH RETAIL ENTERPRISE LTD | Rochdale | A rating |
| Nilkanthraj Limited | Eastbourne | A rating |
| NILL LIMITED | Croydon | A rating |
| NILLKANTH UK LTD | HARROW | A rating |
| NILO & COMPANY T/A SHALFORD VILLAGE STORES LIMITED | Essex | A rating |
| Nilo Construction Limited | Upshire | A rating |
| NILOFER ISHAK KARA T/A NILU'S ADVANCED BEAUTY | BOLTON | A rating |
| Nils Consultancy Limited | London | A rating |
| NILS SOLUTIONS LIMITED | Leicester | A rating |
| Nilu Enterprise Ltd T/A Modis Newsagents & Off Licence | Twickenham | A rating |
| Nilu Fuel Ltd | London | A rating |
| Nim's Fruit Ltd | Sittingbourne | A rating |
| Nima's Ltd. | COVENTRY | A rating |
| Nimah Beauty Ltd | Luton | A rating |
| NIMAL & SONS LTD t/a BP | Reading | A rating |
| NIMAL SERVICE LTD T/A COSTCUTTER | Cornwell | A rating |
| Nimalan Nadarajah T/A Scott Stores | Warrington | A rating |
| Nimax Theatres Limited | London | A rating |
| Nimble Elearning Ltd | Stonehouse | A rating |
| NIMBOUS LTD | London | A rating |
| Nimbus Digital & Technology Innovations | Stratford-upon-Avon | A rating |
| Nimbus IT Solutions Limited | Sevenoaks | A rating |
| Nimbus Ninety Ltd | London | A rating |
| Nimbus Property Systems Ltd | Warwick | A rating |
| Nimbuscare Limited | York | A rating |
| NIMDTA | Belfast | A rating |
| Nimika Best Food & Wine | London | A rating |
| Nimisha Consulting Limited | London | A rating |
| NIMIT LTD | Matson | A rating |
| NIMITT PRIVATE LTD | Lincoln | A rating |
| Nimogen Limited | Macclesfield | A rating |
| NIMONTRON INDIAN RESTAURANT LTD | Camberley | A rating |
| NIMRA PROPERTIES LTD | DEWSBURY | A rating |
| NIMRA TRANSPORT LIMITED | Birmingham | A rating |
| Nimrah Tradering Company Limited | Rochdale | A rating |
| Nimrod Property Invest ltd | London | A rating |
| Nimu Services Ltd | Buckingham | A rating |
| NIN Local Supermarket Limited | London | A rating |
| Nina Campbell Limited | Albourne | A rating |
| Nina Litchfield Studios Ltd | London | A rating |
| Nina Sisters Ltd | Harrow | A rating |
| NINA19(UK) LTD | Chertsey | A rating |
| NINAGOLD LIMITED | London | A rating |
| NINANAIRA LTD | Middlesex | A rating |
| Ninaya Hospitality Ltd T/A The White Hart | Maidenhead | A rating |
| Nine Barks Limited | London | A rating |
| Nine Basingstoke Limited T/A Holiday Inn Basingstoke | Basingstoke | A rating |
| NINE BLESSINGS LIMITED | Romford | A rating |
| Nine Bloomsbury Green Limited | London | A rating |
| Nine Consulting Ltd | Chippenham | A rating |
| Nine Heathrow Ventures Limited T/A Novotel London Heathrow Airport T1 T2 and T3 | Hayes | A rating |
| Nine Lives Bristol Ltd | London | A rating |
| Nine Morecambe Ltd | Manchester | A rating |
| Nine Realms CIC | Glasgow | A rating |
| Nine Stars Ltd T/A Grays of Westminster | London | A rating |
| Nine United Properties UK ltd | London | A rating |
| NINE58 Advisors | London | A rating |
| Nineteen Group Limited | Wimbledon | A rating |
| Nineteen Twenty Bars Ltd | London | A rating |
| Ninety Consulting Ltd | London | A rating |
| Ninety One UK Limited | London | A rating |
| Ninety Percent Ltd | London | A rating |
| Ninety Percent Of Everything Limited | London | A rating |
| NINETY THREE LONDON LTD | London | A rating |
| Ningbo UK Innovation Management Ltd | London | A rating |
| Nini Peri Peri LTD | Keighley | A rating |
| Nini Social Care Services CIC | Birmingham | A rating |
| Ninja Innovations Limited | Leicester | A rating |
| Ninja Kiwi Europe Ltd | Dundee | A rating |
| Ninja Theory Limited | Cambridge | A rating |
| Ninja Tune Limited | London | A rating |
| Ninja vapes ltd | Manchester | A rating |
| Nintendo of Europe SE, UK branch | Windsor | A rating |
| Nintex UK Limited | London | A rating |
| Ninthan Retail Ltd | Northumberland | A rating |
| NIO Comm Ltd | Albourne | A rating |
| NIO Performance Engineering Ltd | Witney | A rating |
| NIOA UK Ltd | Bristol | A rating |
| NIOC International Affairs (London) Limited | London | A rating |
| NIOCOCKTAILS UK LTD | London | A rating |
| nippers Nursery(Yorkshire) LTD | knaresborough | A rating |
| Nippon Auto Spares Ltd | Derby | A rating |
| Nippon Express (UK) Ltd | Hayes | A rating |
| Nippon Hoso Kyokai (NHK) - [Japan Broadcasting Corporation] | London | A rating |
| Nippon Jidosha International Limited | Sutton | A rating |
| Nippon Kaiji Kyokai (UK) Ltd | London | A rating |
| Nippon Life Global Investors Europe Plc | London | A rating |
| NIPPON LP RESOURCES UK LIMITED | London | A rating |
| Nippon Paint Automotive (UK) Limited | Swindon | A rating |
| Nippon Steel Trading Austria GmbH London Office | London | A rating |
| Nippon Television Network London Bureau T/A Nippon TV (NNN) London | London | A rating |
| Nippon Thompson Europe B.V. | Milton Keynes | A rating |
| Nippon Yakin Europe Limited | London | A rating |
| NIPUNA SOLUTIONS LTD | St.Albans | A rating |
| Niqisha Enterprises Ltd | Cardiff | A rating |
| NIR GENERAL STORE | Leicestershire | A rating |
| NIRAA UK TRADING LTD | Bridlington | A rating |
| NIRALLA SWEETS LTD. | Luton | A rating |
| Niramu Limited | London | A rating |
| NIRANTHI LIMITED T/A TRADE FINANCE SERVICES UK | GERRARDS CROSS | A rating |
| NIRAS Group (UK) Ltd | Ascot | A rating |
| Nirav Patel T/A TaxAssist Accountants | Ashton-Under-Lyne | A rating |
| Niresh Accountancy & Consultancy Ltd | London | A rating |
| NIRJALA LTD T/A SPAR- JONELLA | SURREY | A rating |
| Nirjeet Singh and Jagjeet Kaur T/A R K News | Middlesbrough | A rating |
| Nirlak Consultancies Ltd | Middlesex | A rating |
| Nirmal And Sons LTD | Sunbury on Thames | A rating |
| NIRMAL HOMES LIMITED | Grays | A rating |
| Nirmal Supermarket Ltd | Smethwick | A rating |
| NIRMALA GROUP LTD | Bicester | A rating |
| NIRMALA LTD T/A NIRMALA CONSULTANCY SERVICES | Reading | A rating |
| Nirmalan Vinayagamoorthy T/A | London | A rating |
| NIRMALAROJAN THURAIRAJAH T/A AMOR STORES & POST OFFICE | WRINGTON | A rating |
| Nirman Sewak Jatha Sikh Heritage | Bristol | A rating |
| NIROJAN PIRABAKARAN T/A NIRO'S | Blackpool | A rating |
| Nirootell International Limited | Notthinghamshire | A rating |
| NIROS CONSULTING LIMITED | READING | A rating |
| Nirosh Care Homes Limited | Burton-On-Trent | A rating |
| Niru ( Europe) ltd | Surrey | A rating |
| NIRU SERVICES LIMITED | Wembley | A rating |
| Nirupa Piratheepan trading as KL Food & Wine | Wallasey | A rating |
| Nirush Retail Limited | Durham | A rating |
| Nirva Energy Ltd | Chasetown | A rating |
| Nirvaanah Ltd | Bristol | A rating |
| NIRVANA BRANDS LTD | Watford | A rating |
| Nirvana Intelligent Systems Limited T/A NISYST | Bolton | A rating |
| Nirvana Lounge Limited | Harrow | A rating |
| Nirvana Maintenance Ltd | Kent, | A rating |
| Nirvana Media Ltd | Bradford | A rating |
| Nirvana Spa & Leisure Ltd. | Wokingham | A rating |
| Nirvana Squared Limited | Pinner | A rating |
| NIRWELL UK LIMITED | London | A rating |