| Aspects Infotech Ltd | London | A rating |
| ASPEN CARE LIMITED | Southampton | A rating |
| ASPEN CONCEPTS LIMITED | DUDLEY | A rating |
| Aspen Hill Healthcare Limited | Leeds | A rating |
| Aspen Insurance UK Limited | London | A rating |
| Aspen Lodge Care Home | Skegness | A rating |
| Aspen Medical Practice | Gloucester | A rating |
| Aspen Medical Services Ltd t/a Chelsea Bridge Clinic | London | A rating |
| Aspen Pumps Limited | Hailsham | A rating |
| Aspen Stromb Consultancy Limited | London | A rating |
| Aspen Village Limited t/a Forest Care Village | Borehamwood | A rating |
| Aspens Charities Limited | Pembury | A rating |
| AspenTech Ltd | Reading | A rating |
| ASPER MARBLE AND GRANITE LTD | HOUNSLOW | A rating |
| Asper Soft Limited | London | A rating |
| ASPER TECHNOLOGIES LIMITED | Wembley | A rating |
| Asper.AI Limited | North Harrow | A rating |
| Aspermont Media Ltd | London | A rating |
| ASPERS MANAGEMENT SERVICES LIMITED | LONDON | A rating |
| Aspiga Ltd | London | A rating |
| Aspin Management Systems Ltd | Hampshire | A rating |
| Aspinal of London | West Sussex | A rating |
| ASPINALL VERDI LIMITED | Leeds | A rating |
| Aspinall's Club Limited | London | A rating |
| Aspira Aerial Applications Limited | Manchester | A rating |
| ASPIRADO TRADING LIMITED | LONDON | A rating |
| Aspirant Analytics Ltd | London | A rating |
| ASPIRANT CONSULTANCY SERVICES LTD | London | A rating |
| ASPIRATIONS ACADEMIES TRUST | Hounslow | A rating |
| Aspire 2 Be Ltd | London | A rating |
| ASPIRE AND LEARN LTD | Ystrad Mynach | A rating |
| ASPIRE CARE (BLACKPOOL) LIMITED T/A PAR VIEW | BLACKPOOL | A rating |
| Aspire Care and Wellbeing Ltd | Reading | A rating |
| ASPIRE CARE SERVICES LTD | London | A rating |
| Aspire Care SW bristol | Bristol | A rating |
| Aspire Community Benefit Society Ltd | Leeds | A rating |
| ASPIRE COMUNITY CARE & SUPPORT | LONDON | A rating |
| Aspire Day Nursery LTD | Surbiton | A rating |
| ASPIRE EXCEL LTD | Barking | A rating |
| Aspire FT UK Limited | London | A rating |
| Aspire Furniture Ltd | Leeds | A rating |
| Aspire Green LTD | Tuxford Newark | A rating |
| Aspire Holidays Ltd | Stratford | A rating |
| ASPIRE HOMEWARE LTD | Birmingham | A rating |
| Aspire House Ltd | Harrow | A rating |
| Aspire Housing & Personal Development Services Limited | Glasgow | A rating |
| Aspire Information Technologies Limited | Brentford | A rating |
| Aspire Infotech Technologies Ltd | Harrow | A rating |
| ASPIRE INTERNATIONAL VENTURES LTD | London | A rating |
| Aspire Laboratories Ltd | East Dagenham | A rating |
| Aspire Learning Centres & Childcare Limited | Manchester | A rating |
| Aspire Life Care Limited | Worthing | A rating |
| Aspire Living Ltd | Hereford | A rating |
| Aspire Medical Health | Rochester | A rating |
| ASPIRE OXFORDSHIRE COMMUNITY ENTERPRISE LIMITED | Oxford | A rating |
| Aspire Payments Ltd | Chester | A rating |
| Aspire People Limited | Sutton Coalfield | A rating |
| ASPIRE PHYSIOTHERAPY CARE LIMITED | Hinckley | A rating |
| Aspire Pro-serv Ltd | Birmingham | A rating |
| ASPIRE RECRUITMENT & TRAINING LTD | London | A rating |
| Aspire Security Limited | Surrey | A rating |
| ASPIRE SQUARE LTD | NEW CASTLE UNDER LYNE | A rating |
| Aspire Support Ltd | Liskeard | A rating |
| Aspire Supported Living Services | London | A rating |
| Aspire Systems (India) Private Limited | London | A rating |
| Aspire Systems UK Ltd | London | A rating |
| ASPIRE TECHNOLOGY LTD | Reading | A rating |
| Aspire technology solutions | Gateshead | A rating |
| ASPIRE TRADING HOUSE LIMITED | LEEDS | A rating |
| ASPIRE TUTORING LTD | London | A rating |
| Aspire Wellbeing Limited | Newcastle upon Tyne | A rating |
| ASPIRE-GB LTD | Knebworth | A rating |
| ASPIRED DIGITAL LTD | Ilford | A rating |
| ASPIRELINK LTD | London | A rating |
| ASPIREONLINE LTD | Feltham | A rating |
| Aspires H & P Ltd T/A Lucky's Off Licence | London | A rating |
| Aspirez Limited | Chesire | A rating |
| ASPIRITY PARTNERS HOLDINGS LIMITED | LONDON | A rating |
| Aspray House LTD | Leyton | A rating |
| Asprey Group Ltd | Hemel Hempstead | A rating |
| Asprey Holdings Limited | London | A rating |
| Aspris Children Services | Leicester | A rating |
| ASPS (BRIGHTON) LIMITED | BRIGHTON | A rating |
| ASQ Education Ltd | London | A rating |
| Asquire Wealth Management | Richmond | A rating |
| Asquith House Dental Practice | Lichfield | A rating |
| ASR FUEL GROUPS LTD | Pentrebach | A rating |
| ASR GEMS LTD | London, | A rating |
| ASR PROPERTY TRADING LIMITED | Leicester | A rating |
| ASR Retail Ltd TA All Saints Service Station | Portsmouth | A rating |
| ASR UK FOOD LIMITED T/A YAARI | London | A rating |
| ASR Worldwide Limited | Uxbridge | A rating |
| ASRA RETAIL LIMITED | Reading | A rating |
| Asrev Healthcare Ltd | Preston | A rating |
| ASS-SAMEE LIMITED | NORWICH | A rating |
| ASSA ABLOY GLOBAL SOLUTIONS UK LIMITED | Olney | A rating |
| ASSA ABLOY Ltd | West Midlands | A rating |
| Assa Advisors UK Ltd | London | A rating |
| Assael Architecture Ltd | London | A rating |
| Assala Energy UK Limited | London | A rating |
| ASSAN PANEL UK LIMITED | Ipswich | A rating |
| ASSAS PROPERTIES LIMITED | Morton | A rating |
| Assassin Goods Limited | Penrith | A rating |
| ASSD Employment LTD | London | A rating |
| Assemble Design Ltd | London | A rating |
| Assemble Technologies UK Ltd (t/a Atticus) | London | A rating |
| Assemble Technology Ltd | Liverpool | A rating |
| Assemble You Limited | Birmingham | A rating |
| Assemblies of God (Bangor) Pentecostal Church | Bangor | A rating |
| Assembly Festival | Edinburgh | A rating |
| ASSEMBLY MEDIA LIMITED | London | A rating |
| Assembly Studios Ltd | London | A rating |
| Assenheims Catering Ltd | London | A rating |
| Assent Care and Support Services Ltd | Spalding | A rating |
| Assenta Limited | Edinburgh | A rating |
| Assenti Health Ltd | Ely | A rating |
| Assentian Limited | Doncaster | A rating |
| Assesmont Group Ltd | Wickford | A rating |
| Asset & Infrastructure Engineering Ltd | Pencoed | A rating |
| Asset Auctions Ltd | Tuxford | A rating |
| Asset Dynamics Group Limited | Towcester | A rating |
| Asset Green Ltd | London | A rating |
| ASSET GUIDE LIMITED | Harrow | A rating |
| Asset Infotech Limited | Slough | A rating |
| Asset Management One International Ltd | London | A rating |
| Asset Management One International Ltd. | London | A rating |
| Asset One Services LLP | Bristol | A rating |
| Asset Organisation | Sunderland | A rating |
| Asset Reality Ltd | Berkhamsted | A rating |
| ASSET SERVICES LIMITED | Dorset | A rating |
| Asset UK Limited | Dartford | A rating |
| Asset Value Investors Limited | London | A rating |
| Asset Workflows Ltd | London | A rating |
| Asset55 Limited | Sunderland | A rating |
| AssetLogic International Ltd | Godalming | A rating |
| Assets Integrated Limited | London | A rating |
| Assetvault Limited | Greater London | A rating |
| Assheton Carter Ltd | Alderton | A rating |
| Assicurazioni Generali S.p.A. UK Branch | London | A rating |
| Assimil8 Limited | Leicester | A rating |
| Assimila Limited | Reading | A rating |
| Assisi Pet Care Limited | London | A rating |
| Assist Accountants Limited | Barking, | A rating |
| Assist Care & Support Ltd | Livingston | A rating |
| Assist Care Group | Beare Green | A rating |
| Assist Care Home Ltd | Bradford | A rating |
| Assist Care Team | Northampton | A rating |
| Assist Digital EU Limited | IPSWICH | A rating |
| ASSIST DOMICILIARY CARE LIMITED | Stafford | A rating |
| Assist in China Ltd | London | A rating |
| Assisted Accommodation Ltd. | London | A rating |
| Assisted Care Solutions Limited | Berkshire | A rating |
| Assisted Lives | Bradford | A rating |
| Assisted Living Care Group Ltd | Northampton | A rating |
| Assisted Reproduction & Gynaecology Centre | London | A rating |
| ASSISTIQUE SOLUTIONS LIMITED | East Ham, London | A rating |
| Assistive Solutions | London | A rating |
| ASSISTORY LTD | Manchester | A rating |
| ASSISTPLUS | Bristol | A rating |
| Asso Ltd | London | A rating |
| Associate Management Systems Limited | London | A rating |
| Associated Architects UK Limited | Birmingham | A rating |
| Associated British Foods Plc | London | A rating |
| Associated British Ports (ABP) | London | A rating |
| Associated Care Centres | Canterbury | A rating |
| Associated Construction Services Ltd | Cookstown | A rating |
| Associated Country Women of the World | London | A rating |
| Associated Dental Products Ltd | Swindon | A rating |
| Associated Independent Stores | Solihull | A rating |
| Associated Industries Limited TA Golfzon UK | Wirral | A rating |
| Associated Newspapers Ltd | London | A rating |
| Associated Petroleum Terminals (Immingham) Limited | Immingham | A rating |
| Associated Stone Group Ltd | Charlton | A rating |
| Associated Veterinary Services Limited | Rainham | A rating |
| Associated Waste Management Limited | Leeds | A rating |
| Associated Wellbeing | Preston | A rating |
| Associates in Advertising Limited | London | A rating |
| Association for Decentralised Energy | London | A rating |
| Association for Financial Markets in Europe | London | A rating |
| ASSOCIATION OF BAPTISTS FOR WORLD EVANGELISM OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND | Epsom | A rating |
| Association of British Insurers | London | A rating |
| Association of Colleges | London | A rating |
| Association of Commonwealth Universities | London | A rating |
| Association of Commonwealth Universities (Head Office) | London | A rating |
| Association of Ehl-i-Sunnah & Jummat (Glasgow) | Glasgow | A rating |
| Association of Employment & Learning Providers | Bristol | A rating |
| Association of International Certified Professional Accountants (UK) | London | A rating |
| Association of Optometrists | London | A rating |
| Association of Professional Property Eductors | London | A rating |
| Association of Scientists, Developers and Faculties | Harrow | A rating |
| Association of Scottish Muslims | Edinburgh | A rating |
| Assore International Holdings Limited | London | A rating |
| Assort Limited | London | A rating |
| ASSOS CATERING LIMITED | Cardiff | A rating |
| Assosia Ltd | Brentwood | A rating |
| Assots Limited | Birmingham | A rating |
| Assumption Grammar School | Ballynahinch | A rating |
| Assura Hospitality Ltd t/a Buchanan Arms Hotel | Glasgow | A rating |
| Assure Care Ltd | Milton Keynes | A rating |
| Assure Healthcare Group (South) Limited | Southampton | A rating |