| IPV Ventures Ltd | High Wycombe | A rating |
| IPX Global Ltd | Bolton | A rating |
| IQ Capital Partners LLP | London | A rating |
| IQ Data Group Limited trading as DataIQ | London | A rating |
| IQ DRIVER TRAINING LIMITED | DUNSTABLE | A rating |
| IQ EQ (UK) Services Limited | London | A rating |
| IQ EQ Administration Services (UK) Ltd | London | A rating |
| IQ EQ Maxcomply Limited | London | A rating |
| IQ GADGETS LIMITED | Dartford | A rating |
| IQ Homecare LTD | Oxford | A rating |
| IQ Integrity Limited | Westhill | A rating |
| IQ Legal Limited | Birmingham | A rating |
| IQ Link Ltd | London | A rating |
| IQ RETAILS LIMITED | Somerset | A rating |
| IQ-AV Limited | Weybridge | A rating |
| IQA OPERATIONS GROUP LIMITED | Edinburgh | A rating |
| Iqbal & Co Superstore | Cupar | A rating |
| IQBAL & SONS TEXTILE LIMITED | Birmingham | A rating |
| Iqbal Construction Enterprise Ltd | Brighton | A rating |
| Iqbal Groceries Ltd T/A Go Local Extra | Bradford | A rating |
| IQBAL HALAL MEAT LTD | Watford | A rating |
| Iqbal Ismael TAI t/a Sundarbon Tandoori Takeaway | Nuneaton | A rating |
| Iqbal Superstore Ltd | Watford | A rating |
| IQD FREQUENCY PRODUCTS LIMITED | Crewkerne | A rating |
| IQE (Europe) Limited | St Mellons | A rating |
| IQEQ DIGITAL LTD | Birmingham | A rating |
| IQGeo UK Limited | Cambridge | A rating |
| IQLIK LTD | Manchester | A rating |
| IQM Medical LTD | Birmingham | A rating |
| IQPC Limited | London | A rating |
| IQPLUS CHILDCARE AND EDUCATIONAL SERVICES LIMITED | Hemel Hempstead | A rating |
| IQRA EDUCATIONAL & WELFARE TRUST LTD T/A Sapience Girls Academy | Oldham | A rating |
| Iqra Foods Limited | Walsall | A rating |
| IQRA HELP FOUNDATION | London | A rating |
| Iqra Learning Centre | Glasgow | A rating |
| Iqra Property Ltd | London | A rating |
| IQRA WELFARE FORUM | MANCHESTER | A rating |
| IQronix Ltd | Staines-upon-Thames | A rating |
| IQSA Services Limited | London | A rating |
| IQT International UK Limited | London | A rating |
| IQTECH Ltd | Romford | A rating |
| iQualify UK | Grays | A rating |
| IQUANTA INTERNATIONAL FINANCIAL CONSULTANCY LIMITED | London | A rating |
| iQuanti International Ltd. | London | A rating |
| iquique limited | richmond | A rating |
| IQUW Administration Services Limited | London | A rating |
| IQVIA Laboratories Ltd | Livingston | A rating |
| IQVIA Limited | Reading | A rating |
| IR IT Consultancy Services Limited | Slough | A rating |
| IR&C Ltd T/A Reg-1 | London | A rating |
| IRA SOLUTIONS LIMITED | Southall | A rating |
| IRAKORA LIMITED | LONDON | A rating |
| Iran Air, The Airline of the Islamic Republic of Iran | LONDON | A rating |
| Iranian Oil Company (UK) Ltd | Aberdeen | A rating |
| IRARA Services Ltd | Sheffield | A rating |
| Iraye group Limited | Luton | A rating |
| Irbis Capital Ltd. | London | A rating |
| Irbis Capital Partners Limited | London | A rating |
| IRC Care Services | Oxted | A rating |
| IRCA Manufacturing UK Limited | York | A rating |
| IRECRUIT NOW LTD | London | A rating |
| Ireland Alloys Limited | Hamilton | A rating |
| Ireland Wood and Horsforth Medical Practice | Leeds | A rating |
| Irem General Contractor UK Limited | Southampton | A rating |
| iRemit Global Remittance Ltd. | London | A rating |
| IRENOV8 & REFURBISH LTD T/A IRENOV8 & REFURBISH | Newcastle upon Tyne | A rating |
| Irentify UK Limited | Edinburgh | A rating |
| Irepair Motherwell Limited | Motherwell | A rating |
| Iress FS Limited | Cheltenham | A rating |
| IRG ADVISORS LLP | LONDON | A rating |
| Irha & Inaya Ltd. T/ A Cyberlinks | Manchester | A rating |
| IRHAA SANA FOODS LIMITED | Nottingham | A rating |
| iRhythm Technologies Limited | Bagshot | A rating |
| Iridium Medical Practice | Birmingham | A rating |
| IRIE! dance theatre | London | A rating |
| IRIS Advisors Limited | London | A rating |
| IRIS Audio Technologies Limited | London | A rating |
| Iris Avenue Ltd | London | A rating |
| Iris Care Services Ltd | Hemel Hempstead | A rating |
| IRIS Group Limited | London | A rating |
| Iris Nation Worldwide Limited | London | A rating |
| IRIS ONE UNITED LTD | Sutton | A rating |
| Iris Prize Outreach Limited | CARDIFF | A rating |
| iRiS Software Systems Ltd | London | A rating |
| IrisGuard UK Ltd | Milton Keynes | A rating |
| Irish and King Dental Practice | Exeter | A rating |
| Irish Ferries (U.K.) Limited | Liverpool | A rating |
| Irish Football Association Limited | Belfast | A rating |
| Irish Hospitality Ltd t/a The George Inn | Bristol | A rating |
| Irish Waste Management Ltd | Carryduff | A rating |
| Irish Waste Recycling Ltd | Belfast | A rating |
| IRISi | Bristol | A rating |
| IRISNDT Limited | Immingham | A rating |
| IriusRisk Limited | Beaconsfield | A rating |
| IRJ.IO LTD | Farnborough | A rating |
| IRL Ventures Limited | Oxford | A rating |
| IRLAM SUPERMART LTD | Lancashire | A rating |
| Irma Management Ltd | Winchester | A rating |
| Iro Sushi Ltd | Croydon | A rating |
| IROB INTERNATIONAL LIMITED | COLESHILL | A rating |
| iRobot UK Limited | London | A rating |
| Iroko Securities Limited | London | A rating |
| IRON SOLUTIONS LIMITED | NORTON | A rating |
| Iron Wealth Management Limited | Milton Keynes | A rating |
| Ironbridge Holdings Limited | London | A rating |
| Ironbridge Medical Practice | Telford | A rating |
| Ironclad Contracting UK Limited | London | A rating |
| Irongate Ltd | Winstone | A rating |
| Ironhall Hospitality (Bradford) | Preston | A rating |
| IRONMAN Ltd. | Abingdon | A rating |
| Ironopolis Medical Group | Middlesbrough | A rating |
| Ironshield Capital Management LLP | London | A rating |
| Ironside Farrar Limited | Edinburgh | A rating |
| Ironwood Flooring Services Ltd | Sarratt | A rating |
| Irrational Agency Limited | London | A rating |
| Irshad Trust t/a The Islamic College | London | A rating |
| IRTS Business Solutions Limited | Northolt | A rating |
| Irvine Cricket Club | Irvine | A rating |
| IRVINE EATS LIMITED T/A INDIAN PALACE | Irvine | A rating |
| Irvine Thanvi Natas Solicitors | London | A rating |
| IRVINE TRADE HUB LTD T/A Londis | Irvine | A rating |
| Irvinestown Health Centre | Irvinestown | A rating |
| IRVING STORES LIMITED T/A IRVING STORES | SOUTHAMPTON | A rating |
| IrvinGQ Ltd | Bridgend | A rating |
| Irwell Insurance Company Limited | Manchester | A rating |
| Irwin Mitchell LLP | Sheffield | A rating |
| IRXPHARMACO LTD | Crawley | A rating |
| iS Healthcare Dynamics Limited | Farnham | A rating |
| IS Research LTD | Rotherwick | A rating |
| IS-Instruments Ltd | Tonbridge | A rating |
| ISA Consortium Ltd | Croxley Green | A rating |
| ISA HAIR STYLIST LIMITED | London | A rating |
| ISA Irvine Limited trading as Londis & Annick Service Station | Irvine | A rating |
| ISA NEWS LIMITED | LONDON | A rating |
| ISA UK ENVELOPE SOLUTIONS Ltd | London | A rating |
| ISAAC WHOLESALE LIMITED | Peterborough | A rating |
| Isaacs Accountants UK Limited | Bradford | A rating |
| Isabel & Elsa's Restaurant Limited | Finchley | A rating |
| Isabel Beauty Studio Ltd | Uckfield | A rating |
| Isabel Hospice | Welwyn Garden City | A rating |
| Isabel Mayfair Limited | London | A rating |
| Isabella Stefanelli Ltd | London | A rating |
| Isabella Worsley Ltd. | London | A rating |
| Isabella's Homes Limited | Dudley | A rating |
| ISAC EDUCATION LIMITED | London | A rating |
| Isaggio Ltd | London | A rating |
| ISAM Funds (UK) Limited | London | A rating |
| Isandbox Ltd | Maidstone | A rating |
| ISArc Limited | Coleraine | A rating |
| Isatec Ltd | Chesham | A rating |
| ISB Global Limited | Brentford | A rating |
| ISB TECH SOLUTIONS LIMITED | HARROW | A rating |
| Isbah Graphics Ltd | Luton | A rating |
| ISCA FORWARDING LIMITED | EXETER | A rating |
| ISCA UK Limited | Newport | A rating |
| Iscar Tools Limited | Birmingham | A rating |
| Ischebeck Titan Limited | Burton upon Trent | A rating |
| ISDC GLOBAL SERVICES LTD | HIGHWYCOMBE | A rating |
| Isdel Energy Limited | Bristol | A rating |
| ISDI Ltd | London | A rating |
| ISEAL Alliance | London | A rating |
| ISEARCH GLOBAL LIMITED | SOUTH CROYDON | A rating |
| iseepr Limited | Leeds | A rating |
| Iseki UK & Ireland Limited | Ipswich | A rating |
| ISEMBARD LTD | London | A rating |
| Isenburg Aero Engines Limited | Southend on sea | A rating |
| ISF INTERNATIONAL LTD | Coventry | A rating |
| ISF Services Limited | London | A rating |
| ISFY LTD | Nottinghamshire | A rating |
| ISGEN LTD | Manchester | A rating |
| ISHA FOUNDATION | Slough | A rating |
| ISHA GROUP UK PVT LTD T/a The Souvlaki | London | A rating |
| ISHA RETAILERS LIMITED | Gloucester | A rating |
| Ishaaq and Tahseen Ltd | London | A rating |
| Ishaaq and Tahseen Ltd T/A German Doner Kebab | London | A rating |
| ISHAAS INDIAN EATERY LIMITED | AMBLESIDE | A rating |
| Ishak Practices Ltd | Nottingham | A rating |
| Ishan Ltd T/A Essential Express Food & Wine | London | A rating |
| Ishango Ltd | Hove | A rating |
| Ishanvi Limited | Croydon | A rating |
| ISHAQ ENTERPRISES LTD | Bolton | A rating |
| Ishbilia Restaurant | London | A rating |
| ISHFAQ ARIF W. SHOPS TOOLS TR UK LTD 14678705 | ENGLAND | A rating |
| Ishi Express | London | A rating |
| Ishida Europe Ltd. | Birmingham | A rating |
| Ishika Food And Service Limited T/A Hot House Pizza Northwood | Northwood | A rating |
| Ishika Subs Ltd | Bognor Regis | A rating |
| ISHIV MANSFIELD LTD T/A TEXACO | Mansfield | A rating |
| Ishka Limited | London | A rating |
| ISHMEH LTD T/A MAMTAZ MAHAL | WESTCLIFF -ON-SEA | A rating |
| ISHOPELECTRONICS LTD | NORBURY | A rating |
| Ishtiaq Mehmood TA King Currys | Brighouse | A rating |
| Ishy Limited | Buckingham | A rating |
| iSIGHT Clinic | Southport | A rating |
| Isin Ltd | London | A rating |
| ISIO GROUP LIMITED | London | A rating |
| Isis Chiropractic LLP | Milton Keynes | A rating |
| ISKCON Scotland | Lesmahagow | A rating |
| ISKENDER EST. 1867 LIMITED | London | A rating |
| ISKO SERVICES LIMITED | LONDON | A rating |