| Actors Touring Company (London) Ltd | London | A rating |
| Actronics Limited | Colchester | A rating |
| Acts Community Church Limited | Tylorstown | A rating |
| Acts London | London | A rating |
| Actual Care Services Ltd | Birmingham | A rating |
| ACTUAL TIME OF ARRIVAL LTD | LONDON | A rating |
| Actuaria Initia Limited | Beckenham | A rating |
| ACTUARIAL ADVISORY SERVICES LIMITED | Hornchurch | A rating |
| Actuation Lab | Bristol | A rating |
| Actum International UK Limited | London | A rating |
| Acturis Ltd | London | A rating |
| Acu-Flow Limited (t/a Nebu~Flow) | Glasgow | A rating |
| ACUA Ocean Limited | Plymouth | A rating |
| ACUDEMY LIMITED | London | A rating |
| Acuigen Ltd | Cranfield | A rating |
| Acuiti Labs Limited | London | A rating |
| Acuity Advisors Limited | London | A rating |
| Acuity Engineering Limited | Corby | A rating |
| ACUITY KNOWLEDGE PARTNERS (UK) LIMITED | London | A rating |
| Acuity Professional Services Ltd | London | A rating |
| ACUITY RESEARCH & PRACTICE LTD. | Barnstaple | A rating |
| Acuity Solutions Ltd | London | A rating |
| Acuma Solutions Limited | Stockport | A rating |
| Acumant Limited | Buckinghamshire | A rating |
| Acumatica UK Limited | London | A rating |
| Acumec Ltd | Coalville | A rating |
| Acumen Accountants and Tax Advisers Ltd | London | A rating |
| Acumen Bay Consultancy Limited | Maidenhead | A rating |
| Acumen Claims LTD | Mansfield | A rating |
| Acumen Commercial Insights LTD | Richmond upon Thames | A rating |
| Acumen Construction Group Ltd | London | A rating |
| Acumen Design Associates Limited | London | A rating |
| Acumen Field Limited | Stockport | A rating |
| Acumen Global Academy Ltd | Romford | A rating |
| ACUMEN IBC LTD | Abingdon | A rating |
| Acumen Inc | London | A rating |
| ACUMEN LONDON LTD | London | A rating |
| Acumen Recruitment Limited | Winchester | A rating |
| Acumen Software Ltd | Northampton | A rating |
| Acumen Waste Services Limited | Knottingley | A rating |
| Acupro Clinic | London | A rating |
| Acurable Ltd | London | A rating |
| ACUSERV SOLUTIONS LIMITED | London | A rating |
| Acushnet Europe Ltd | St Ives | A rating |
| ACUTE BLOSSOM & CO LIMITED | London | A rating |
| Acute Scaffold Design Ltd | Bristol | A rating |
| ACUTEC Limited | Birmingham | A rating |
| ACUTRO LTD | London | A rating |
| Acutus Medical UK Ltd | London | A rating |
| Acuura Limited | London | A rating |
| Acuutech Limited | Loughton, | A rating |
| Acuvate Software Ltd | London | A rating |
| ACWIN LTD | OLDHAM | A rating |
| ACWIN RETAIL LTD | TAMWORTH | A rating |
| Acwin Ventures Ltd | Shrewsbury | A rating |
| ACX INSTRUMENTS LTD | Cambridge | A rating |
| Acxiom Limited | London | A rating |
| ACZONE CONSULTANTS LTD | Croydon | A rating |
| AD Architects | Hertford | A rating |
| Ad Astra Bars Limited T\A The Three Crowns. | London | A rating |
| AD ASTRA BC LTD | Manchester | A rating |
| AD BROKER LTD | London | A rating |
| AD BUILDING RENOVATION LTD | Birmingham | A rating |
| AD Data Analytics Ltd | Peterborough | A rating |
| Ad Eatery Limited t/a Subway | London | A rating |
| AD FOOD & BEVERAGES LTD | London | A rating |
| Ad Hoc London Ltd | London | A rating |
| Ad Hoc Property Management Ltd | London | A rating |
| Ad idem Consulting Limited | London | A rating |
| AD Implant.com Limited T/A Dental Implant Centre | Reading | A rating |
| AD Mobiles & Accessories Ltd | Manchester | A rating |
| AD OFF LICENCE | Warrington | A rating |
| AD Piccadilly ltd | London | A rating |
| AD Property Training Ltd | SHEFFIELD | A rating |
| AD Recycling Limited | Flintshire | A rating |
| AD Retail Ltd | Alford | A rating |
| AD Security Solutions Ltd | Aylesbury | A rating |
| AD Service Holbrook Ltd | Ipswich | A rating |
| AD Services 2010 Ltd | Birmingham | A rating |
| Ad Signal Limited | York | A rating |
| AD STYLE & BEAUTY LTD | Derby | A rating |
| AD SUPERSTORE | COVENTRY | A rating |
| Ad Systems UK Ltd | Blackpool | A rating |
| AD Technologies Ltd | Reading | A rating |
| AD UD DEEN LTD | LONDON | A rating |
| AD URMSTON RESTAURANTS LTD | MANCHESTER | A rating |
| Ad Valorem Accountancy Services Limited | Milton Keynes | A rating |
| AD-DUHA FOUNDATION | BIRMINGHAM | A rating |
| ADA (HUDDS) LTD | HUDDERSFIELD | A rating |
| ADA BUSINESS CONSULTANCY LTD | Chelmsford | A rating |
| ADA CO ACCOUNTS LTD | sheffield | A rating |
| ADA COUNSELLING LTD | London | A rating |
| Ada Digital Health Ltd | London | A rating |
| ADA FOOD AND BEVERAGE LTD | London | A rating |
| ADA Informatics Limited | Dagenham | A rating |
| Ada Turkish Restaurant Limited | Elgin | A rating |
| Ada Web (UK) Limited | London | A rating |
| Adaab Knitwear Ltd | Oldham | A rating |
| ADAB | Bury | A rating |
| Adada Ltd T/A Adada Care Services | Chester | A rating |
| Adadot limited | London | A rating |
| Adaero Precision Components Ltd. | Crediton | A rating |
| Adagio Hotels UK Limited | London | A rating |
| Adagiovr Limited | Farnham Common | A rating |
| ADAHJON DESIGN LTD | Dundee | A rating |
| Adair Ltd | Epsom | A rating |
| ADAJ LIMITED | Wembley | A rating |
| Adajour Limited | London | A rating |
| Adakli Limited | London | A rating |
| Adalah Residential Home LTD | Leigh On Sea | A rating |
| Adalvo UK Ltd | London | A rating |
| Adam & Co Accountancy Ltd | Bradford | A rating |
| Adam & Co Accountants Limited | Bolton | A rating |
| Adam Accountancy Limited | Slough | A rating |
| ADAM AND EESA LIMITED | Manchester, England | A rating |
| ADAM Architecture Ltd | Winchester | A rating |
| Adam Ashar Limited | Swindon | A rating |
| ADAM Asset Management Limited | London | A rating |
| Adam Autos | London | A rating |
| ADAM BALTI & PIZZA LIMITED | HARROGATE | A rating |
| Adam Bernard Solicitors | London | A rating |
| ADAM BOOZE LIMITED | Manchester | A rating |
| Adam Build Ltd | London | A rating |
| ADAM BUILDING SOLUTIONS LTD | Dagenham | A rating |
| ADAM CABS LTD | Cambridge | A rating |
| Adam Carr Builders Ltd | Carnforth | A rating |
| Adam Catering (London) Ltd | Rochester | A rating |
| Adam CEX Ltd | Batley | A rating |
| ADAM CONSTRUCTIONS (LEICESTER) LTD | leicester | A rating |
| Adam Ellis Ltd | London | A rating |
| ADAM FARM FRESH LIMITED | Hitchin | A rating |
| Adam Grocers Ltd T/A Abu Bakr Supermarket | Leeds | A rating |
| Adam Grooming Atelier Ltd | London | A rating |
| ADAM HALAL FOODS LIMITED | Birmingham | A rating |
| Adam Handling Limited T/A Frog by Adam Handling | Greater London | A rating |
| Adam Haulage Services Ltd | Nottingham | A rating |
| Adam Hope Bespoke | HEMEL HEMPSTEAD | A rating |
| Adam Kirby t/a Vicarage Farm Stables and Livery | Kirtling | A rating |
| Adam Legal Services Solicitors Ltd | London | A rating |
| Adam Mathew Digital Limited | Marlborough | A rating |
| Adam Mosque & Dawah Academy | Birmingham | A rating |
| Adam Renovations Ltd | London | A rating |
| ADAM SAJID HALAL POULTRY LIMITED | Smethwick | A rating |
| Adam Smith International Limited | London | A rating |
| Adam Spiegel Productions Ltd | London | A rating |
| Adam Supplies Ltd | Chesham | A rating |
| ADAM Sweets Ltd | London | A rating |
| ADAM TYRES LTD | Smethwick, | A rating |
| Adam Windows Rochdale Limited | Rochdale | A rating |
| Adam's Building Construction Limited | Bradford | A rating |
| Adam's Car's MK LTD | Leighton Buzzard | A rating |
| Adam's Healthcare Nelson Ltd | Nelson | A rating |
| ADAMA Agricultural Solutions UK ltd | Theale | A rating |
| ADAMA Entertainment Limited | London | A rating |
| Adamant Composites UK Ltd | Cambridge | A rating |
| Adamas Investment Holdings LLP | London | A rating |
| Adamas Wind Limited | Hexham | A rating |
| Adamo Foods Ltd | Nottingham | A rating |
| ADAMO LONDON LTD | London | A rating |
| ADAMS & CO UK LTD | England | A rating |
| Adams & Moore Limited | Dartford | A rating |
| Adams & Moore Solicitors LLP | London | A rating |
| Adams Academy Inc Ltd | Aldgate | A rating |
| ADAMS CARE LTD | Chingford | A rating |
| Adams Carpets & Furniture Limited | Brierley Hill | A rating |
| Adams Chiropractic Limited | Newark | A rating |
| Adams Estates Ltd | Reading | A rating |
| ADAMS FARMING LIMITED | STRANGFORD | A rating |
| ADAMS FOOD SERVICES | RUBERY | A rating |
| Adams Foodservice Trading Ltd | Bradford | A rating |
| ADAMS GLOBAL LIMITED | Blackburn | A rating |
| Adams Gold Limited | London | A rating |
| ADAMS LEISURE LIMITED | Colchester | A rating |
| ADAMS LOFT LTD | Glasgow | A rating |
| Adams Street Partners UK LLP | London | A rating |
| Adamson Associates (International) Ltd | London | A rating |
| Adamson Knight Limited | London | A rating |
| ADAMSONS CITY ACCOUNTANTS LTD | ILFORD | A rating |
| ADAN PROMOTIONAL CONCEPTS (UK) LTD | London | A rating |
| ADAP HEALTHCARE LTD | HARLOW | A rating |
| ADAPPT LIMITED | TWICKENHAM | A rating |
| ADAPT ems Ltd | Hitchin | A rating |
| Adapt Formwork Limited | Warrington | A rating |
| Adaptate Biotherapeutics Limited | London | A rating |
| Adaptavate Ltd | Emersons Green | A rating |
| Adaptech AI LTD | London | A rating |
| Adaptimmune Limited | Abingdon | A rating |
| Adaptive Financial Consulting Ltd | London | A rating |
| Adaptix Limited | Oxford | A rating |
| Adaptogen Capital Ltd. | London | A rating |
| ADAPTOGENIC LAB LTD | London | A rating |
| Adaptos Ltd/ TA Sonder | Warwick | A rating |
| Adaptovate Ltd | London | A rating |
| Adara Healthcare Limited | Northampton | A rating |
| Adare SEC Ltd | Leicester | A rating |
| Adarr Enterprise Ltd | Salisbury | A rating |
| ADAS GLOBAL LIMITED | LEICESTER | A rating |
| ADAS UK GROUP LTD | Milton Keynes | A rating |
| ADASTRA RETAIL LTD | TERNHILL | A rating |
| ADAVO LIMITED | Wallsend | A rating |