| Energy Gardens Limited | City of Westminster, London | A rating |
| Energy Growth Momentum LLP | London | A rating |
| Energy Help Limited | Birmingham | A rating |
| Energy Institute | London | A rating |
| Energy Intelligence Group | London | A rating |
| ENERGY LIGHT BULBS LTD | UXBRIDGE | A rating |
| energy live news ltd | Cuffley | A rating |
| Energy Metrics Monitoring & Management UK Ltd T/A EM3 UK | Warwick | A rating |
| Energy Network Services Ltd | Wimborne | A rating |
| Energy Networks Association | London | A rating |
| ENERGY PERFORMANCE CERTIFICATE CHECK LTD | Luton | A rating |
| Energy Potential Tech Solutions Limited | Denbighshire | A rating |
| Energy Power Resources Limited | Woodbridge | A rating |
| ENERGY PRICES DIRECT LIMITED | Glasgow | A rating |
| Energy Research Lab Ltd | London | A rating |
| Energy Saving Homes Ltd | Solihul | A rating |
| Energy Saviour Ltd | Slough | A rating |
| ENERGY SOLUTIONS (ES) LTD | Cardiff | A rating |
| Energy Solutions UK Ltd | Aylesford | A rating |
| Energy Space Systems Limited | Leicester | A rating |
| ENERGY SUITE LTD | Nelson | A rating |
| Energy Systems Catapult | Birmingham | A rating |
| Energy Trading Ireland Limited | Belfast | A rating |
| Energy Utilities Limited | Manchester | A rating |
| Energy Vault Solutions UK Ltd | London | A rating |
| ENERGY4UK LTD T/A ENERGY4UK | Barking | A rating |
| Energybuild Ltd | Glynneath | A rating |
| EnergyDrive Systems Ltd | Milton Keynes | A rating |
| ENERGYFORCE LIMITED | Tickton | A rating |
| Energypeople Limited | Colchester | A rating |
| Energypeople Ltd | Colchester | A rating |
| EnergyPro Ltd | London | A rating |
| energystore Limited | Holywood | A rating |
| Energytech Solutions Ltd | London | A rating |
| Energytest Ltd | Sheffield | A rating |
| EnergyVue Services Limited | Aberdeen | A rating |
| ENERGYWINS HI-TECH MATERIALS LIMITED | London | A rating |
| ENERJ SMART LTD | Luton | A rating |
| EnerMech Limited | Aberdeen | A rating |
| Enermed UK Ltd | Manchester | A rating |
| Enersol UK Limited | London | A rating |
| Enerst Care Carlisle | Carlisle | A rating |
| EnerSys | Newport | A rating |
| ENERTECH LIMITED | Droitwich | A rating |
| ENERTECH SYNERGIES LTD. | Aberdeenshire | A rating |
| Enertechnos Holdings Limited | Kingston | A rating |
| Enertechnos Limited | London | A rating |
| Enertherm Engineering Ltd | Peterborough | A rating |
| Enertis UK Limited | London | A rating |
| Enesco Limited | Carlisle | A rating |
| Enesel Group Limited | London | A rating |
| ENETCO POWER UK LTD | London | A rating |
| eNETT International UK Limited | London | A rating |
| Eneus Energy Limited | Edinburgh | A rating |
| Enevaro Global Holdings Ltd | London | A rating |
| Enevate Homes Limited | Dartford | A rating |
| Enex Hoizon Ltd | Tankersley | A rating |
| Enfield Chiropractic Clinic Ltd | London | A rating |
| Enfield County School for Girls | Enfield | A rating |
| Enfield Cricket Club | Accrington | A rating |
| Enfield Grammar School | Enfield | A rating |
| Enfield Plumbing Supplies Limited | Enfield | A rating |
| ENFIELD SPECSAVERS LIMITED | Enfield | A rating |
| Enfinium Limited | London | A rating |
| Enfogen Ltd | Milton Keynes | A rating |
| Enfuce UK Ltd | London | A rating |
| Enfuse Group Ltd | London | A rating |
| Enfusion Systems UK Ltd | London | A rating |
| ENG Consulting Limited | London | A rating |
| ENG RETAILS LTD | England | A rating |
| Engage Anywhere UK LTD | London | A rating |
| ENGAGE DIGITAL PARTNERS | LONDON | A rating |
| Engage Digital Partners Limited | London | A rating |
| Engage Process UK Ltd | Greater London | A rating |
| Engage Productions Ltd | Warrington | A rating |
| Engage Technology Partners Limited | Ipswich | A rating |
| ENGAGED LTD | TOWCESTER | A rating |
| EngageTech | London | A rating |
| Engaging Works Group Ltd | London | A rating |
| Engel Construction Ltd | East Horsley | A rating |
| Engelhart CTP Services (UK) Limited | LONDON | A rating |
| Engelhart CTP UK Ltd | London | A rating |
| Engenda Group | Runcorn | A rating |
| Engenuiti Ltd | London | A rating |
| Engenuity Limited | Burgess Hill | A rating |
| ENGI PRO (ENGINEERING PROFESSIONAL SERVICES) LIMITED | Rayleigh | A rating |
| ENGIE UK Limited | London | A rating |
| Engine AI Limited | London | A rating |
| ENGINE BUILD LTD | Romford | A rating |
| ENGINE CARE PARTS LIMITED | BRENTFORD | A rating |
| Engine Creative Agency Ltd | Northampton | A rating |
| Engine Creative Consultants Ltd | LONDON | A rating |
| ENGINE REBORN LTD | Essex | A rating |
| ENGINECHECK LIMITED T/A Reengineered Transmissions | ESSEX | A rating |
| Engineer.ai Global Ltd | London | A rating |
| Engineered Arts Limited | Falmouth | A rating |
| Engineered Fabrication Solutions Limited | Highbridge | A rating |
| Engineered Performance Coatings Ltd | Cardiff | A rating |
| ENGINEERED REINFORCING STEEL INDUSTRIES UK LIMITED | Loughborough | A rating |
| Engineered Solutions (Projects) Ltd | newcastle upon tyne | A rating |
| Engineered Vibration Solutions Ltd | Bristol | A rating |
| Engineeria Ltd | London | A rating |
| ENGINEERING AND CONSULTANCY GROUP LTD | Newcastle upon Tyne | A rating |
| Engineering Construction Industry Training Board | London | A rating |
| ENGINEERING CONSULTANCY SERVICES LIMITED | Derby | A rating |
| Engineering Council | London | A rating |
| ENGINEERING DESIGN & SUPPLIES LTD | Ellistown | A rating |
| Engineering Design Consultants London Limited | London | A rating |
| Engineering Efficiency Ltd | Mitcham | A rating |
| ENGINEERING PLASTICS LIMITED | COOKSTOWN | A rating |
| Engineering Projects Protechnology Ltd | London | A rating |
| Engineering Systems Design (Group) Ltd | Bolton | A rating |
| ENGINEERING TECH LIMITED | Manchester | A rating |
| Engineering Techniques Limited | London | A rating |
| Engineers Haskins Robinson Waters Limited | London | A rating |
| ENGINEERS INDIA LIMITED | HOUNSLOW | A rating |
| Engitix Limited | London | A rating |
| England and Wales Cricket Board Limited | London | A rating |
| England Hockey | Marlow | A rating |
| England's Grace Ltd | London | A rating |
| Engleton House Surgery | Coventry | A rating |
| English And Vocational Academy (EVA) Ltd | Cheltenham | A rating |
| English Care | Shrewsbury | A rating |
| English Cheesecake Company Ltd | Maidenhead | A rating |
| English Lakes Hotels, Resorts and Venues | Windermere | A rating |
| English Language Holdings Limited | London | A rating |
| English National Ballet | London | A (SME+) |
| English National Ballet School | London | A rating |
| English National Opera | London | A rating |
| English PEN | London | A rating |
| English Riviera Hotels Limited T/A Beachfield Hotel | Penzance | A rating |
| ENGLISH SOLUTIONS SERVICES LIMITED | Birmingham | A rating |
| English Stage Company | London | A rating |
| English Table Tennis Association | Milton Keynes | A rating |
| English Touring Opera | London | A rating |
| English Touring Theatre Ltd | London | A rating |
| English Volleyball Association | Loughborough | A rating |
| English White Shipping Limited | London | A rating |
| English Youth Ballet | Orpington | A rating |
| ENGLOW EDUCATION LTD | Bracknell | A rating |
| ENGTAN HOLDINGS LTD | Manchester | A rating |
| EngUC | Newcastle upon Tyne | A rating |
| Enhance Dynamics Ltd | Potters Bar | A rating |
| Enhance Group (UK) Ltd | East Sussex | A rating |
| Enhance Healthcare Holdings Ltd | Hamilton | A rating |
| Enhance Old Town Limited | London | A rating |
| Enhanceable | Kingston upon Thames | A rating |
| Enhanced Care Solutions Limited | London | A rating |
| Enhanced Engineering Group Limited | Camberley | A rating |
| Enhanced Genomics Limited | Cambridge | A rating |
| Eni CCUS Holding Limited | London | A rating |
| Eni Energy Group Holdings Limited | London | A rating |
| ENI GATES LIMITED | Crowthorne | A rating |
| Eni Global Energy Markets S.p.A - UK Establishment | London | A rating |
| Eni International Resources Limited | London | A rating |
| ENI SHIPPING (UK) LTD | Staines upon Thames | A rating |
| Eni Trade & Biofuels S.p.A UK Establishment | London | A rating |
| ENI UK Limited | London | A rating |
| ENIGEN UK LIMITED | Colchester | A rating |
| ENIGMA ACCOUNTANCY SERVICES LIMITED | Milton Keynes | A rating |
| ENIGMA BODYTECH LTD | Glasgow | A rating |
| Enigma Clinical Solutions Ltd | Weston-Super-Mare | A rating |
| ENIGMA INT LTD | Hindley | A rating |
| Enigma Software Solutions Limited | London | A rating |
| Enimed Limited | Pinner | A rating |
| EniProgetti SpA | Basingstoke | A rating |
| Enique IT Solutions Limited | Livingston | A rating |
| Eniro Care Limited | Didcot | A rating |
| Enistic Limited | Oxford | A rating |
| ENIXCARE LIMITED | Northampton | A rating |
| Enji Technologies | London | A rating |
| ENJO Limited T/A ENJO UK | HARPENDEN | A rating |
| Enjoy Church | Portishead | A rating |
| Enjoy Designs | Leeds | A rating |
| Enjoy Digital Communications Ltd | Leeds | A rating |
| Enjoy Training Limited | Wokingham | A rating |
| Enjoy Verse LTD | Dartford | A rating |
| Enka Motors | London | A rating |
| ENKA Uk Construction Limited | London | A rating |
| ENKA UK PROPERTIES LTD | London | A rating |
| Enkae Prestige Motors | Huddersfield | A rating |
| Enkahnz Smart Repair Limited | Bradford | A rating |
| ENKEL PROJECT LOGISTICS LTD | London | A rating |
| Enki Solutions Limited | LEEDS | A rating |
| Enko Capital Management LLP | London | A rating |
| Enlight Group Limited | London | A rating |
| ENLIGHT10 LIMITED | London | A rating |
| Enlighten Learning Trust | Esher | A rating |
| ENLIGHTEN SMILES LTD | LONDON | A rating |
| Enlighten Software Limited | London | A rating |
| ENLIGHTENED CARE GENERATION LTD | LEICESTER | A rating |
| Enlightenment Care Services Ltd | Peterborough | A rating |
| Enlim Excavations Ltd | Bellaghy | A rating |
| ENM Capital Ltd | London | A rating |
| Enmarq Technologies Limited | Reading | A rating |
| ENMEI Knightsbridge Limited | London | A rating |
| ENN LIVING INTERIORS LTD | Middlesex | A rating |
| Ennea Capital Partners UK Ltd | London | A rating |
| Ennis Enterprises Ltd | Holywood | A rating |
| ENNIS FOODS LTD | Cardiff | A rating |