| Investindustrial Corporate Services Limited | London | A rating |
| Investindustrial Management Limited | London | A rating |
| Investindustrial Services Limited | London | A rating |
| Investis Digital Limited | London | A rating |
| INVESTMATRIX INVESTMENTS LTD | London | A rating |
| Investment Association | London | A rating |
| Investment Management Partners Limited | London | A rating |
| Investment Mastery Trading Ltd | Borehamwood | A rating |
| Investment Plus LTD | London | A rating |
| Investment Trends Limited | Norfolk | A rating |
| Investments Key Limited | London | A rating |
| Investoo Ltd | London | A rating |
| INVESTOR IN PEOPLE COMMUNITY INTEREST COMPANY | LONDON | A rating |
| INVESTOR NETWORKS LTD | London | A rating |
| Investor Update Limited | London | A rating |
| InvestorFlow UK Limited | London | A rating |
| INVESTORHUB LTD | London | A rating |
| Investors for Purpose Limited | Norwich | A rating |
| Investra Capital Limited | London | A rating |
| Investre Limited | london | A rating |
| Investsun Ltd | London | A rating |
| InvestUK Worldwide Ltd | London | A rating |
| Investwin Ltd | Manchester, | A rating |
| Invexans Limited | London | A rating |
| Inveztor Ltd | London | A rating |
| Invibes Advertising UK Ltd | London | A rating |
| Invicta Dynamos Limited | Maidstone | A rating |
| Invicta Health CIC | Ramsgate | A rating |
| INVICTIQ LIMITED | WATFORD | A rating |
| Invictus Restaurants Ltd | London | A rating |
| INVICTUS SECURITY AND RECRUITMENT SERVICES LTD | South Woodford | A rating |
| INVIGOR ADOLESCENT CARE LIMITED | Manchester | A rating |
| Invincible Software Holdings Ltd | Abingdon | A rating |
| Invincible Structures Ltd | Manchester | A rating |
| Invincibles Studio Ltd | Preston | A rating |
| Invinity Energy (UK) Limited | London | A rating |
| Inviqa UK Limited | London | A rating |
| Invisage Alpha LTD | London | A rating |
| Invisible Connections Ltd | Thame | A rating |
| INVISIBLE SYSTEMS LTD | Manchester | A rating |
| INVISIO Communications Limited | Watford | A rating |
| InVision Software Limited | Leicester | A rating |
| Invision360 | Ipswich | A rating |
| Invisors Europe Limited | Reading | A rating |
| INVISTA Textiles (UK) Limited | London | A rating |
| INVITO DESIGN LIMITED | London | A rating |
| Invivo Clinical Ltd | Stroud | A rating |
| INVO PROJECT CONSULTANT UK LTD | COVENTRY | A rating |
| Invoka Consulting | london | A rating |
| Involve Leeds | Leeds | A rating |
| INvolve People Ltd | London | A rating |
| Involved Productions Ltd | London | A rating |
| Involvement Ltd | Hyde | A rating |
| Invonex Limited | Leicester | A rating |
| Invosys Ltd | Manchester | A rating |
| Invotyx Limited | London | A rating |
| invoX Belgium UK Ltd | London | A rating |
| Invus UK Limited | London | A rating |
| inx limited | Sheffield | A rating |
| INXPRESS GLOBAL LIMITED | ROCHDALE | A rating |
| Inyanga Maritime Limited | Penryn | A rating |
| Inzen Stores Ltd | Brigg | A rating |
| Inzpire Limited | Lincoln | A rating |
| Inztec Ltd | York | A rating |
| IO BARS LTD | London | A rating |
| IO Consulting (Energy) UK LLP | London | A rating |
| IOC ANABTAWI UK LTD | London | A rating |
| iOCO Solutions Limited | Reading | A rating |
| Iodi Private Limited T/A Lombard Big Discount Pound Plus Essential | Newark On Trent | A rating |
| IODM (UK) Limited | London | A rating |
| IOEL GREEK FOOD LTD T/A MYTHOS | POOLE | A rating |
| IOFOODSUK LTD | Cheltenham | A rating |
| IOHK UK Limited | Edinburgh | A rating |
| IOI Brighton Limited | Brighton | A rating |
| IOI SERVICES LIMITED | London | A rating |
| IOKODA TECHNOLOGIES LTD | London | A rating |
| IOMI SUPPORTED LIVING LTD | Luton | A rating |
| ioMosaic International Limited | Bath | A rating |
| Ion Asset Architecture UK Limited | London | A rating |
| ION BEAM APPLICATIONS SA | NEWPORT | A rating |
| Ion Beam Services (UK) Ltd | Bathgate | A rating |
| Ion Care and Support Services Ltd | Broxburn | A rating |
| Ion Films Limited | London | A rating |
| Ion Industries Ltd | Newcastle upon Tyne | A rating |
| ION MAN LIMITED | London | A rating |
| Ion Opticks UK Ltd | Abingdon | A rating |
| ION Science Ltd | Fowlmere | A rating |
| Ion Technologies Ltd | Belfast | A rating |
| ION Trading UK Limited | London | A rating |
| ion Ventures Ltd | Oxted | A rating |
| Iona Capital Ltd | London | A rating |
| Iona Logistics Ltd. | Cranfield | A rating |
| IONATE Limited | Edinburgh | A rating |
| Ionbond UK Limited | Consett | A rating |
| Ionech Limited | Harwell | A rating |
| Ionetic Limited | Brackley | A rating |
| Ionic Systems Ltd | SWINDON | A rating |
| Ionic Technologies International Limited | Belfast | A rating |
| Ionoptika Ltd | Chandler's Ford | A rating |
| Iontas Limited | Cambridge | A rating |
| IOPEX TECHNOLOGIES LTD | LONDON | A rating |
| Iorthocenter LTD | London | A rating |
| IOS RECRUITMENT AND TRAINING SERVICES LTD | Cardiff | A rating |
| IosBio Ltd | Haywards Heath | A rating |
| IOSpeed limited | london | A rating |
| IOT Homes Limited | London | A rating |
| IOT Innovation Lab Ltd | Leyton | A rating |
| IoT Solutions Group Ltd | Swanage | A rating |
| IOT TRADING LTD | Salford | A rating |
| IoT Tribe Ltd | London | A rating |
| IoT.nxt UK Limited | London | A rating |
| IOTA Managed Services Ltd | Ascot | A rating |
| IOTA Manufacturing Limited T/A IOTA Manufacturing | Middlesbrough | A rating |
| iota Sciences Limited | Oxford | A rating |
| IOTAC LTD | London | A rating |
| IOTech Systems Limited | Newcastle Upon Tyne | A rating |
| iov42 Limited | London | A rating |
| Iovox Limited | London | A rating |
| IP Agency | London | A rating |
| IP Builders Brickwork Limited | Edgware | A rating |
| IP Equipment Sales Ltd d/b/a Vermeer UK | Wellingborough | A rating |
| IP EXCHANGE (MSP) LIMITED | Merseyside | A rating |
| IP Fabric UK Limited | London | A rating |
| IP FOODS LTD T/A Little Canton | Southampton | A rating |
| IP Global Properties Limited | London | A rating |
| IP Global Services Limited | Winnersh | A rating |
| IP Group plc | London | A rating |
| IP Integration Limited | Reading | A rating |
| IP Solicitors | ILFORD | A rating |
| IP-PERFORMANCE LTD | Bristol | A rating |
| Ipackchem Limited | Cheshire | A rating |
| IPAF | Crooklands | A rating |
| Ipandi UK Limited | London | A rating |
| iPayLinks UK LLP | London | A rating |
| IPC Information Systems | London | A rating |
| Ipca Laboratories UK Limited | Sunderland | A rating |
| IPCI UK Ltd | High Wycombe | A rating |
| IPCO UK Process Systems Limited | Kingswinford | A rating |
| IPE International Publishers | London | A rating |
| IPE Property Development Management Ltd | London | A rating |
| IPEARL TECH SOLUTIONS LTD | Abergavenny | A rating |
| IPEC Limited | Stockport | A rating |
| Ipeco Holdings Limited | Southend-on-Sea | A rating |
| Ipek Mobilya (Ilford) Ltd trading as Ipek Furnishing | Ilford | A rating |
| IPEK MOBILYA (UK) LIMITED | LONDON | A rating |
| IPersonal Physiotherapy LTD | EASTBOURNE | A rating |
| IPFT Fuels Limited | Hayward Heath | A rating |
| IPFWORLDWIDE LIMITED | ILFORD | A rating |
| IPG Automotive UK Limited | Solihull | A rating |
| IPG Health Medical Communications Ltd | London | A rating |
| IPG Photonics (UK) LTD | Coventry | A rating |
| IPH Insurance Service (UK) Ltd | Borehamwood | A rating |
| iPharm UK Ltd | Birmingham | A rating |
| Ipharmacy Direct Ltd | Ashton Under Lyne | A rating |
| Iphix Phones Ltd t/a Iphix Phones | Heanor | A rating |
| Iphoenix Studio Ltd | London | A rating |
| IPHONE CENTRE LIMITED | BRADFORD | A rating |
| Ipieca Limited | London | A rating |
| iPinYou UK Limited | London | A rating |
| iPipeline Limited | Cheltenham | A rating |
| iPlace Global Ltd | Derby | A rating |
| iPlay 'N' Talk Limited | London | A rating |
| iplicit Limited | Bournemouth | A rating |
| IPlus Mobiles | Salford | A rating |
| IPMT Limited | London | A rating |
| Ipotane Saddlery LTD. | Chinnor | A rating |
| IPP Analytics Limited | Basildon | A rating |
| IPP MASTER LTD | LONDON | A rating |
| Ippudo London Co Ltd | London | A rating |
| iPresent Ltd | Weybridge | A rating |
| IProfix Limited | London | A rating |
| IPROOV LTD | LONDON | A rating |
| iProtectU Limited | Wickham | A rating |
| IPRS Group Ltd | Chorley | A rating |
| IPS - INTEGRATED PROJECT SERVICES LIMITED | BIRMINGHAM | A rating |
| IPS (Aberdeen) Ltd | Aberdeen | A rating |
| IPS (Integrated Paramount Services Limited) | West Drayton | A rating |
| IPS Adhesives Europe Limited (previously Unika) | Newcastle Upon Tyne | A rating |
| IPS COURIERS LIMITED | LEICESTER | A rating |
| IPS International Limited | Rochester | A rating |
| Ipsen Biopharm Limited | Wrexham | A rating |
| IPSON LTD | Carlisle | A rating |
| Ipsos Mori UK Limited | London | A rating |
| Ipsotek Ltd | Wimbledon | A rating |
| IPSUM CONSTRUCTIONS LTD | London | A rating |
| Ipsum Utilities Limited | Chorley | A rating |
| Ipswich Dental Surgery | Ipswich | A rating |
| Ipswich Education Limited | Ipswich | A rating |
| Ipswich Food & Wine | Ipswich | A rating |
| IPSWICH HAPPY SHOPPERS LIMITED T/A PREMEIR | IPSWICH | A rating |
| Ipswich Road Surgery ltd | Norwich | A rating |
| Ipswich School | Ipswich | A rating |
| Ipswich Specsavers Hearcare Limited | Ipswich | A rating |
| Ipswich Speedway Promotions Ltd | Ipswich | A rating |
| IPSWICH TOWN FOOTBALL CLUB | Ipswich | A rating |
| Ipswich Town Womens Football Club Limited | Ipswich | A rating |
| Ipswich Visionplus Ltd T/A Specsavers Opticians | Ipswich | A rating |
| iPsychTec Ltd | London | A rating |
| IPTELBD LTD | London | A rating |
| ipTEST | Guildford | A rating |