| Acorn Care Home | Ilford | A rating |
| Acorn Chemical Services | Neath | A rating |
| Acorn Community Care | Norton | A rating |
| ACORN COMPLIANCE LTD | Birmingham | A rating |
| Acorn Construction (Yorkshire) Ltd | Sherburn In Elmet | A rating |
| ACORN DAY OPPORTUNITIES LTD | London | A rating |
| Acorn Diagnostics Ltd | Penarth | A rating |
| Acorn Fertility | Colliers wood | A rating |
| Acorn Fostering Services Limited | Leicester | A rating |
| Acorn Health Care Limited | East Grinstead | A rating |
| Acorn House Veterinary Hospital | Bedford | A rating |
| Acorn Industrial Services Limited | Rotherham | A rating |
| Acorn Insurance and Financial Services Limited | Liverpool | A rating |
| Acorn IT Systems Ltd | Reading | A rating |
| Acorn Lodge (Bournemouth) LTD | Bournemouth | A rating |
| Acorn Lodge Care Home | London | A rating |
| Acorn Lodge Ltd t/a Acorn Lodge Care Home | Hackney | A rating |
| Acorn Mobility Services Limited | Steeton | A rating |
| Acorn Normanton | Normanton | A rating |
| Acorn Nursing Home | Birmingham | A rating |
| Acorn Park Nursery | Glasgow | A rating |
| Acorn Psychology Ltd | Haslingden | A rating |
| Acorn Recruitment Ltd | Newport | A rating |
| Acorn Surgery | Huntingdon | A rating |
| Acorn Taxis Thetford Ltd | Thetford | A rating |
| Acorn Tourism Consulting Ltd | Flimwell | A rating |
| Acorn Water UK Ltd | London | A rating |
| Acorns (Southern) Limited | Southampton | A rating |
| Acorns Children's Hospice Trust | Birmingham | A rating |
| Acosta Dance Centre Limited | Woolwich | A rating |
| Acosta Dance Foundation Ltd. | Haywards Heath | A rating |
| Acountax UK Ltd | Ilford | A rating |
| Acoup Ltd | Edinburgh | A rating |
| Acoustic & Engineering Consultants Limited | Stockport | A rating |
| Acoustic Marketing UK Ltd | London | A rating |
| Acoustic Pixel Limited | Middlesbrough | A rating |
| Acoustofab Ltd | London | A rating |
| ACP CONSULTANTS LTD. | London | A rating |
| ACP FOODS LTD | GREAT YARMOUTH ,NORFOLK | A rating |
| ACP Freight Services Limited | Portsmouth | A rating |
| ACP Management Partners, Ltd | London | A rating |
| ACP Trading Limited | Brighton | A rating |
| ACPH Ltd T.A Hopscotch Children's Nurseries | Brighton | A rating |
| Acqua Doria LTD | Alton | A rating |
| ACQUA KITCHENS LTD | SURBITON | A rating |
| Acquah Lodge Limited | Stanmore | A rating |
| Acquia Ltd | Cheltenham | A rating |
| Acquire Care Ltd | Oxford | A rating |
| Acquire Learning College LTD | Sheffield | A rating |
| Acquire Services Group Ltd | London | A rating |
| Acquired Limited | Macclesfield | A rating |
| Acquired Limited | London | A rating |
| Acquis Consulting UK Limited | London | A rating |
| Acquis Insurance Management | Newport | A rating |
| ACRALI HOME LTD | Rochdale | A rating |
| ACRE 714 LTD T/AS AUTO CITY | NORTHOLT | A rating |
| ACRE CARE SERVICES LTD | NORTHWOOD | A rating |
| ACRE CONTRACTORS (LONDON) LTD | Willesden | A rating |
| Acre Heathrow Limited | Hayes | A rating |
| Acre Homecare Ltd | Rochdale | A rating |
| Acre Platforms Limited | London | A rating |
| Acre Resources Ltd | London | A rating |
| ACRE STREET STORE LIMITED | STROUD | A rating |
| Acreage Home LTD | Birmingham | A rating |
| Acreedo Tattoos | Abingdon | A rating |
| ACREO Ltd | Oldmeldrum | A rating |
| Acreon Global Ltd | London | A rating |
| Acrial Limited | Croydon | A rating |
| Acridge Limited | Bakewell | A rating |
| Acrisure International Holdings | London | A rating |
| Acro Aircraft Seating Limited | Crick | A rating |
| Acron Aviation Training Solutions Limited | Altrincham | A rating |
| ACRON ENGINEERING SERVICES (UK) LTD | London | A rating |
| Acron Services Ltd | Luton | A rating |
| Acropolis Street Food Limited | Newcastle upon Tyne | A rating |
| Across The Bay LTD | Morecambe | A rating |
| Across the Pond - Study in Britain Limited | Crookham Village | A rating |
| Across the Pond Group Ltd | London | A rating |
| Acrotrend Solutions Limited | London | A rating |
| ACRS Limited | Pershore | A rating |
| ACS (North) Ltd | Stockport | A rating |
| ACS Building Products Limited | Leeds | A rating |
| ACS CIVILS LTD | Omagh | A rating |
| ACS COMMERCIAL RISK ENGINEERING LTD | Manchester | A rating |
| ACS COURIERS AND LOGISTICS LTD | Bristol | A rating |
| ACS International | Nottingham | A rating |
| ACS International Ltd - UK Branch | Beaconsfield | A rating |
| ACS INTERNATIONAL SCHOOLS LIMITED | Cobham | A rating |
| ACS Professionals in Construction Ltd | Wembley | A rating |
| ACS-TECH LIMITED | COVENTRY | A rating |
| ACSI Europe Ltd | WATCHFIELD | A rating |
| ACT Blade Ltd | Edinburgh | A rating |
| Act Build Change Ltd | Skipton | A rating |
| ACT Developments London Limited | London | A rating |
| ACT Financial Solutions B.V. | London | A rating |
| Act III Ltd | Hove | A rating |
| ACT LEGAL LTD | BRIGHTON | A rating |
| Act3 Consulting Limited | London | A rating |
| Acta Marine UK Limited | South Shields | A rating |
| Actagon Limited | Oxford | A rating |
| Actalent Services Limited | Bracknell | A rating |
| Actelligent (U.K.) Company Limited | London | A rating |
| Actemium UK Ltd | Birmingham | A rating |
| Acteon Group Operations (UK) Limited | Norwich | A rating |
| Actify Training and Technology CIC | Glasgow | A rating |
| Actimize UK Limited | London | A rating |
| ACTING OFFICE LIMITED | London | A rating |
| Action 2 Care | Wellingborough | A rating |
| ACTION 8 RECRUITMENT LIMITED | LONDON | A rating |
| Action 8 Recruitment Ltd | London | A rating |
| Action Against Hunger UK | London | A rating |
| Action for Arts Trust Ltd | Colwyn Bay | A rating |
| Action for care Ltd | Chesterfield | A rating |
| Action for Children | Watford | A rating |
| Action for Health, Education and Disability (AHEAD) International | Birmingham | A rating |
| Action for Humanity | Salford | A rating |
| Action Homeless Leicester | Leicester | A rating |
| ACTION LONDON LIMITED | London | A rating |
| Action on Disability | London | A rating |
| Action on Disability & Development | Frome | A rating |
| Action Reconciliation Service for Peace | Sidmouth | A rating |
| Action Renewables Ltd | Belfast | A rating |
| Action Rocket Ltd | Cambridge | A rating |
| Action Sustainability | London | A rating |
| ActionAid UK | London | A rating |
| ACTIONBROOK SERVICES LTD | South Woodham Ferrers | A rating |
| ACTIONPLUS FOUNDATION | LONDON | A rating |
| Actionstep Operations UK Limited | High Wycombe | A rating |
| Actis LLP | London | A rating |
| Actito UK | London | A rating |
| Actium Bidco (UK) Limited | London | A rating |
| Actium Holdings Limited | London | A rating |
| Activate Accident Repair | Halifax | A rating |
| Activate Intelligence Limited | London | A rating |
| Activate Learning | Oxford | A rating |
| Activate Learning Education Trust | Reading | A rating |
| Activate Performing Arts | Dorchester | A rating |
| Active | Dalry | A rating |
| Active Adult Limited | London | A rating |
| Active Care & Support Ltd | Wembley | A rating |
| Active Care Education Ltd | Dartford | A rating |
| ACTIVE CARE ORGANISATION LIMITED | Northampton | A rating |
| Active Care Plus Ltd | Rotherham | A rating |
| Active Clinics Ltd | Birmingham | A rating |
| Active companions Ltd | Slough | A rating |
| Active Constructions Ltd | Manchester | A rating |
| Active Friendly Support Ltd | Walkley | A rating |
| Active Health | Bath | A rating |
| Active Healthcare Services | Livingston | A rating |
| Active Homes Ltd | Birmingham | A rating |
| Active Information Systems Limited | Chichester | A rating |
| ACTIVE INTERNATIONAL LTD | LONDON | A rating |
| Active Learning Trust | Chatteris | A rating |
| Active Manco Ltd | Darlington | A rating |
| Active Moulds Ltd | Dinnington | A rating |
| Active Moves Limited | Tonbridge | A rating |
| Active Olive Healthcare Limited | Wellingborough | A rating |
| Active Olive Healthcare Ltd | Irthlingborough | A rating |
| ACTIVE OMG LIMITED | London | A rating |
| Active Partners LLP | London | A rating |
| Active Partners Trust | Chestefield | A rating |
| Active Pathways Limited | Chorley | A rating |
| Active Pet | Coleshill | A rating |
| Active Pharmacare Ltd | Manchester | A rating |
| Active Plant Hire Ltd | ESSEX | A rating |
| Active Profile Ltd | Liverpool | A rating |
| Active Prospects | Reigate | A rating |
| Active Recruitment SEN Ltd | Loughton | A rating |
| Active Retail (UK) Limited | London | A rating |
| Active Social Care Limited | Huddersfield | A rating |
| ACTIVE SPORTS TOURISM LTD | London | A rating |
| Active Sports Trust Ltd | Solihull | A rating |
| ACTIVE STUDY AND TRAVEL SERVICES LTD | London | A rating |
| Active Support (Luton) Ltd | Luton | A rating |
| ACTIVE TECH LTD | Romford | A rating |
| Active Training Team Ltd | London | A rating |
| ACTIVE TUNNELLING LIMITED | Coventry, West Midlands | A rating |
| Active Wear Ltd | Maidstone | A rating |
| Active Webdezign Ltd | London | A rating |
| ACTIVECORE LIMITED | ALTRINCHAM | A rating |
| Activecore Limited t/a WellTech | Altrincham | A rating |
| ActiveDocs UK Limited | London | A rating |
| ActiveFence Limited | London | A rating |
| ActiveIS Limited | London | A rating |
| activeMind.legal UK Ltd. | London | A rating |
| ActiveOps PLC | Reading | A rating |
| ActiveQuote Ltd | Cardiff | A rating |
| ActiveViam Ltd | London | A rating |
| ACTIVINSIGHTS LIMITED | KIMBOLTON | A rating |
| Activision Europe, Limited | Birmingham | A rating |
| activpayroll Ltd. | Aberdeen | A rating |
| ACTIVTRADES | LONDON | A rating |
| Activum SG UK Advisors Limited | London | A rating |
| Activus Limited | Bristol | A rating |
| Acton Baptist Church CIO | London | A rating |
| Acton Finishing Limited | Coventry | A rating |
| Acton Lane London Ltd | London | A rating |
| Acton Muslim Welfare Association | London | A rating |
| Actonia Limited | Warwick | A rating |
| ACTORS STUDIO LIMITED | Stoke Poges, Slough | A rating |