| ABINAESH LTD | Morden | A rating |
| ABINAN LTD | London | A rating |
| Abinaya Sivam & Aravinthan Alagaiah T/A Sedgefield Convenient Store | Stockton-on-Tees | A rating |
| Abingdon and Witney College | Abingdon | A rating |
| Abingdon Learning Trust | Abingdon | A rating |
| Abingdon Nurseries Limited | Abingdon | A rating |
| Abingdon School | Abingdon | A rating |
| Abington Park Surgery | Northampton | A rating |
| Abington Park View Care Home | Northampton | A rating |
| Abington Supermarket | Northampton | A rating |
| Abingworth LLP | London | A rating |
| Abintus Consulting Limited | London | A rating |
| ABIRA RETAIL LTD | Mid Glamorgan | A rating |
| Abiramy Retail Limited | Cantley,Doncaster | A rating |
| Abis Cash & Carry Limited | London | A rating |
| Abis Resources Limited | London | A rating |
| ABISA LIMITED | Loughborough | A rating |
| Abitaa Ltd | Leicester | A rating |
| Abitant Ltd | London | A rating |
| Abitol Services Limited | Kent | A rating |
| ABJAK LTD | Liverpool | A rating |
| ABK CHEF LTD | Newton Abbot | A rating |
| ABK Motors Ltd | Dagenham | A rating |
| Abkari Ltd | London | A rating |
| ABL Care Ltd | Kenley | A rating |
| ABL Energy & Marine Consultants Limited | London | A rating |
| ABL London Limited | LONDON | A rating |
| ABL Software Limited | Petersfield | A rating |
| ABL1 Touch Ltd | Reigate | A rating |
| ABLE BUSINESS SERVICES LTD | Dagenham | A rating |
| Able Care ( Menwinnion) Ltd t/a Menwinnion Country House Care Home | Penzance | A rating |
| Able Care Huddersfield Ltd | Huddersfield | A rating |
| Able Carers Ltd | York | A rating |
| ABLE HANDS HEALTHCARE LTD | Rochester | A rating |
| ABLE SERVICES SUPPLIES LTD | London | A rating |
| Able Stainless Steel Fabrications Ltd | Swadlincote | A rating |
| Able Systems Limited | Northwich | A rating |
| Able Taxi Kettering LTD | Kettering | A rating |
| able2achieve | Yeovil | A rating |
| Ablecare (Helston) Limited | Cornwall | A rating |
| AbleCare (Menwinnion) Ltd T/A Menwinnion Country House Care Home | Penzance | A rating |
| AbleCare (PHILIPHAUGH) LTD | London | A rating |
| Ablecross Care Services | Brentwood | A rating |
| Ablegrange (Wembley) Limited | Wembley | A rating |
| ABLEGRANGE SEVERN HEIGHTS LTD | WORCESTER | A rating |
| Abletrust Care Limited | Caterham | A rating |
| Ably Real-Time Ltd | London | A rating |
| ABM Academy Limited | Blackpool | A rating |
| ABM AVIATION UK LIMITED | Hounslow | A rating |
| ABM DIGITAL ACCOUNTANTS LTD | Lonodn | A rating |
| ABM Electrical Distributors Limited | Croydon | A rating |
| ABM GLOBAL COMPLIANCE (UK) LTD | London | A rating |
| ABM HANIA LTD | London | A rating |
| ABM Precast Solutions Ltd | Tuxford | A rating |
| ABM Services Limited | Hounslow | A rating |
| ABM Tiling Ltd | Cousldon | A rating |
| ABMI Engineering UK Ltd | London | A rating |
| ABN AMRO Bank N.V., UK Branch | London | A rating |
| Abnercare Ltd | Macclesfield | A rating |
| Abney & Baker (Bath) Ltd | BATH | A rating |
| Abney Dental Practice | London | A rating |
| Abnormal AI UK Ltd | London | A rating |
| ABO Energy United Kingdom Ltd | Falkirk | A rating |
| ABODE HEALTHCARE LTD | Poulton | A rating |
| ABODUS LIMITED | LONDON | A rating |
| Aboon Ltd T/A Little Things | Glasgow | A rating |
| Abounding Support & Care Ltd | Bordon | A rating |
| About Cooling Ltd | Cheshunt | A rating |
| About Face Ltd | Wokingham | A rating |
| ABOUT THE STAY LIMITED | London | A rating |
| About:Energy Limited | London | A rating |
| ABOVE & BEYOND CREATIVE LTD T/AS ABOVE + BEYOND | LONDON | A rating |
| Above Bar Church | Southampton | A rating |
| ABOVE DIFFERENCE LTD | CHELMSFORD | A rating |
| Above Surveying Ltd | Colchester | A rating |
| ABP (Wellcare) Limited | London | A rating |
| ABP Bridge of Allan | Bridge of Allan | A rating |
| ABP Doncaster | Doncaster | A rating |
| ABP Eatwell | Knowsley | A rating |
| ABP Kingswinford | Kingswinford | A rating |
| ABP Langport | Langport | A rating |
| ABP Penston | Glasgow | A rating |
| ABP UK | Birmingham | A rating |
| ABP Wellcare (Northolt) Ltd | London | A rating |
| ABP WELLCARE (NORTHOLT) LTD | NORTHOLT | A rating |
| ABP Wessex | Northallerton | A rating |
| ABP Yetminster | Yetminster | A rating |
| ABPI | London | A rating |
| ABQ Hospitality & Property Management UK Ltd | Bournemouth | A rating |
| ABQ Investment UK Limited | Bournemouth | A rating |
| ABR Health Ventures Ltd | London | A rating |
| ABR PIZZERIA LIMITED t/a CASTLE BISTRO | Wrexham | A rating |
| ABR Tamwil Ltd T/A ABR Chartered Accountants | London | A rating |
| Abraham Accountants LTD | Bradford | A rating |
| ABRAHAM AND ASSOCIATES | Southend on Sea | A rating |
| ABRAHAM AND SONS MOTORS LIMITED | Wallington | A rating |
| Abraham Baron Solicitors Limited | Birmingham | A rating |
| ABRAHAM NATURAL PRODUCE LTD | KESTON | A rating |
| ABRAHAM NURSING HOMES LTD | PONTYCLUN | A rating |
| Abrahamic Care Services Limited | Goole | A rating |
| Abrams & Chronicle Books Ltd | London | A rating |
| ABRAR 17 LTD T/A PAPRIKA | Cumbria | A rating |
| ABRAR BUTCHERS LTD | Huddersfield | A rating |
| Abrashem Limited | Birmingham | A rating |
| Abrasive Technology Limited | Colwyn Bay | A rating |
| Abraxys Ltd | London | A rating |
| Abridge Systems Limited | Chelmsford | A rating |
| Abril Industrial Waxes | Bridgend | A rating |
| ABRONN MEDICAL UNITS UK LIMITED | Manchester | A rating |
| ABRST Ltd t/a Dhillons | Kilsyth | A rating |
| ABS | Chorley | A rating |
| ABS 12 LTD | AYLSBURY | A rating |
| Abs Advisors Ltd | Romford | A rating |
| ABS Auto Centre Limited | Nottingham | A rating |
| ABS AUTOMATION SYSTEMS LIMITED | Reading | A rating |
| ABS Care Ltd | Isleworth | A rating |
| ABS CARPETS AND BEDS LIMITED | Tipton | A rating |
| ABS DEVELOPMENT GROUP LTD | London | A rating |
| ABS Europe Limited | London | A rating |
| ABS Food & Wine Ltd | South Gloucestershire | A rating |
| ABS FURNITURE LIMITED TA ABS Headboard Link | Birmingham | A rating |
| ABS HAULAGE LTD | Kempston | A rating |
| ABS Luton | Leighton Buzzard | A rating |
| ABS MOTS LIMITED | NOTTINGHAM | A rating |
| ABS QE Assurance Services (UK) Ltd | Warrington | A rating |
| ABS TAUNTON LTD trading as India Gate | Bridgwater | A rating |
| ABS Transport Limited | London | A rating |
| ABS WINDOW & PLASTIC LIMITED | MIDDLESEX | A rating |
| Absa Securities United Kingdom Limited | London | A rating |
| ABSCapCo Limited | London | A rating |
| ABSG Ltd T/A The New Sunar Gow | Lutterworth | A rating |
| Absoft Limited | Aberdeen | A rating |
| Absolar Solutions Limited | Southampton | A rating |
| Absolutdata Analytics UK Limited | Harpenden | A rating |
| Absolutdata Ltd | Romford | A rating |
| ABSOLUTE ALL INCLUSIVE CARE LTD T/a AAICARE | PORTLAND | A rating |
| Absolute Antibody Limited | Redcar | A rating |
| ABSOLUTE CABS LIMITED | Doncaster | A rating |
| Absolute Cad Designs Ltd | Oldbury | A rating |
| Absolute Care AGENCY (EM) LIMITED | Loughborough | A rating |
| Absolute Care Homes (Central) Limited | London | A rating |
| Absolute Care Services Ltd | Teddington | A rating |
| Absolute Care South West Ltd | Honiton | A rating |
| ABSOLUTE CARE UK LTD | READING | A rating |
| Absolute CNC | Birmingham | A rating |
| Absolute Conveyancing Limited | Mansfield | A rating |
| Absolute DT Ltd | Bournemouth | A rating |
| ABSOLUTE FIRE PROTECTION LIMITED | Feltham | A rating |
| Absolute Fitness | York | A rating |
| Absolute Healthcare Providers Ltd | Four Marks | A rating |
| Absolute Healthcare West Limited | London | A rating |
| Absolute Healthcare West Ltd T/A The Village Nursing Home | Brierley Hill | A rating |
| Absolute Home Textiles Limited | Bolton | A rating |
| Absolute Interpreting and Translations Ltd | Birmingham | A rating |
| Absolute Medical International Ltd | Manchester | A rating |
| Absolute Options UK Limited | London | A rating |
| Absolute Pilates Plus LTD | London | A rating |
| Absolute Post Ltd | London | A rating |
| Absolute Results Sales and Marketing Ltd. | Watford | A rating |
| Absolute Retail Consulting Limited T/A AbsoluteLabs | London | A rating |
| Absolute Return Partners LLP | Richmond | A rating |
| ABSOLUTE RISK TECHNOLOGY LIMITED | NOTTINGHAM | A rating |
| ABSOLUTE SECURITY SERVICES LTD | London | A rating |
| Absolute Strategy Research Ltd | London | A rating |
| AbsoluteFibre Ltd | Egham | A rating |
| Absolutely Fad Limited | London | A rating |
| Absolutely No Nonsense Admin Ltd | Cardiff | A rating |
| ABSORB SOFTWARE UK LTD | Huntingdon | A rating |
| Abstract Tech Limited | Leeds | A rating |
| Abstract Trading Ltd | London | A rating |
| ABSWO Group LTD | Nottingham | A rating |
| Abt Britain Limited | London | A rating |
| ABT Construction Ltd | London | A rating |
| ABT CONSTRUCTION SERVICES LTD | London | A rating |
| ABT Europe Ltd. | London | A rating |
| Abtech Ltd | Sheffield | A rating |
| Abtrace Limited | London | A rating |
| Abu Bakar Limited | Leeds | A rating |
| ABU BANGLADESH LIMITED | London | A rating |
| ABU ENTERPRISES LIMITED | Bournemouth | A rating |
| Abu Zahra Foundation | West Yorkshire | A rating |
| Abuelo Covent Garden Limited | London | A rating |
| Abundance Vibes Ltd. | London | A rating |
| Abundant Graze Ltd | Bicester | A rating |
| Abundant Graze Ltd T/A ACH Healthcare (Bicester) | Bicester | A rating |
| ABURI RESTAURANT LTD | Colchester | A rating |
| ABurnet (Hair Containment Solutions) Ltd. | Ilkeston | A rating |
| ABURVA ENTERPRISE LTD | Weston-Super-Mare | A rating |
| Abuz Food Ltd t/a Taza | Dundee | A rating |
| ABV HAIR & BEAUTY LTD | Dartford | A rating |
| Abyaan Ltd t/a Saline Store | Dunfermline | A rating |
| ABZ TRADING LIMITED | London | A rating |
| Abzena (Cambridge) Limited | Cambridge | A rating |
| ABZNI LIMITED | LURGAN | A rating |
| AC Quarterlight LTD | Coventry | A rating |
| AC & AA Limited t/a Betterclean Services | Tunbridge Wells | A rating |
| AC and JA Brodie | Dorking | A rating |
| AC Auto 1 Ltd | Newcastle-under-Lyme | A rating |
| AC Fashion Design Limited | London | A rating |
| AC FINANCIAL ASSOCIATES LTD | WATFORD | A rating |