| Assure Residential Care Ltd | Leicester | A rating |
| ASSURED BUILDING CONTRACTORS (SCOTLAND) LIMITED | Airdrie,, | A rating |
| ASSURED CARS LIMITED | Leeds | A rating |
| ASSURED CARS SUPERMARKET LIMITED | Birmingham | A rating |
| Assured CMS Limited | Shrewsbury | A rating |
| ASSURED DATA PROTECTION LIMITED | Harewood | A rating |
| Assured Enterprise Ltd | Ipswich | A rating |
| Assured Group Ltd | Warwick | A rating |
| Assured Guaranty (UK) Services Limited | London | A rating |
| Assured Hair and Beauty Ltd | London | A rating |
| Assured Healthcare Solutions Holdings Ltd | Alcester | A rating |
| Assured Healthcare Solutions Limited | Tamworth | A rating |
| ASSURED INDEPENDENT SERVICES L | Liverpool | A rating |
| ASSURED LIVING CARE LIMITED | Dartford | A rating |
| Assured Services Limited | SOUTH CROYDON | A rating |
| Assurex Global London Limited | London | A rating |
| Assurex Limited | London | A rating |
| Assuric UK Opco Limited | London | A rating |
| Assurity Systems Ltd | Bath | A rating |
| Assystem Energy & Infrastructure Limited | Bolton | A rating |
| AST CARCARE LIMITED | Peterborough | A rating |
| AST SpaceMobile UK Limited | Leicester | A rating |
| Astanga Yoga London | London | A rating |
| Astar Business Advisors Limited | Morden | A rating |
| Astar Homecare Ltd | Colchester | A rating |
| AStar Homecare Services Ltd | Whitchurch | A rating |
| ASTARTE CAPITAL PARTNERS LLP | London | A rating |
| Astatine Capital Partners LLP | London | A rating |
| Astbury Hall Operations Limited | Bridgnorth | A rating |
| Astec Industries Europe Limited | Omagh | A rating |
| Astech Projects | Runcorn | A rating |
| Asteetva Corporation Ltd | Surbiton | A rating |
| Astek Services ltd | London, England, | A rating |
| Astel Ventures | London | A rating |
| Astell House | Cheltenham | A rating |
| Astellas Pharma Europe Ltd | Addlestone | A rating |
| Astemo UK Ltd | Bolton | A rating |
| Aster Care Ltd | Portsmouth | A rating |
| ASTER HOUSE HEALTHCARE LIMITED | LONDON | A rating |
| ASTER TEXTILE LONDON LIMITED | London | A rating |
| Asterion Industrial Partners | London | A rating |
| Asterley Bros, London Ltd | London | A rating |
| Asteros Advisers | London | A rating |
| Asters Specialist Care (Yorkshire) Ltd | Scarborough | A rating |
| Astex Therapeutics Limited | Cambridge | A rating |
| Asthma and Allergy Foundation | Aberdeen | A rating |
| ASTIR HUB LTD | Batley | A rating |
| ASTK LTD | Bristol | A rating |
| Astles Control Systems Ltd | Princes Risborough | A rating |
| Astley & Tyldesley Cricket Club | Manchester | A rating |
| Astley Bridge Cricket Club | Bolton | A rating |
| Astley Clarke Ltd | London | A rating |
| Astley Grange Nursing Home | Bolton | A rating |
| Astley House Nursing Home Limited | North Berwick | A rating |
| Astley Spice Ltd | Manchester | A rating |
| ASTOGNA LTD | Nottingham | A rating |
| ASTOMOS ENERGY CORPORATION | LONDON | A rating |
| Aston Architectural Aluminium | Watford | A rating |
| Aston Barclay | Normanton | A rating |
| Aston Black Ltd | Milton Keynes | A rating |
| Aston Bond Law Ltd | Slough | A rating |
| ASTON CARE LIMITED | Reading | A rating |
| Aston Community Education Trust | Shirebrook | A rating |
| ASTON COOPERS LTD | ROMFORD | A rating |
| ASTON FOODS LIMITED | BIRMINGHAM | A rating |
| Aston Hall Care Limited | Deeside | A rating |
| Aston Hall Cricket Club | Sheffield | A rating |
| Aston Healthcare Ltd | Huyton | A rating |
| Aston Hotels Limited | High Wycombe | A rating |
| Aston Ingham Cricket Club | Newent | A rating |
| ASTON INTERNATIONAL MANAGEMENT LTD | WADEBRIDGE | A rating |
| Aston Manor Cricket Club | Birmingham | A rating |
| Aston Martin Lagonda Ltd | Gaydon | A rating |
| Aston Pearl Limited | London | A rating |
| Aston Pre-School and Creche Services Ltd | Birmingham | A rating |
| Aston Shaw Ltd | Norwich | A rating |
| Aston Square Block Management Ltd | London | A rating |
| Aston Students' Union | Birmingham | A rating |
| Aston Transitional Care Limited | Wolverhampton | A rating |
| Aston University | Birmingham | A rating |
| Aston Villa FC Limited | Birmingham | A rating |
| Aston Villa Football Club Limited | Birmingham | A rating |
| Aston Villa Women's Football Club Limited | Birmingham | A rating |
| Aston-Med Limited | Surrey | A rating |
| Astor Bannerman | Cheltenham | A rating |
| Astor Business Consulting Ltd | London | A rating |
| Astor Court Hotel | London | A rating |
| Astorg UK Branch | London | A rating |
| ASTORIA HEALTHCARE LTD | HOUNSLOW | A rating |
| Astound Commerce Limited (UK) | London | A rating |
| Astounding Care Services Ltd | Reading | A rating |
| Astra (GB) Limited | London | A rating |
| Astra Asset Management UK Limited | London | A rating |
| Astra Cars Ltd | West Drayton | A rating |
| Astra Global Solutions | London | A rating |
| Astra Homes Ltd | London | A rating |
| ASTRA MAIFAIR LTD | Glasgow | A rating |
| Astra Mining Ltd | London | A rating |
| ASTRA NEWS | London | A rating |
| Astra Partners (Europe) Ltd | London | A rating |
| Astra Telematics Limited | Manchester | A rating |
| Astral Accountancy Services Ltd | Chipping Norton | A rating |
| Astral Neutronics Ltd (trading as Astral Systems) | Bristol | A rating |
| ASTRAL WORLDWIDE LIMITED | London | A rating |
| Astraza Ltd T/A VVITEC | London | A rating |
| AstraZeneca UK Limited | Cambridge | A rating |
| Astrea Academy Trust | Sheffield | A rating |
| Astrea UK Services Limited | Cambridge | A rating |
| Astreya Limited | Cheltenham | A rating |
| Astrid & Miyu Ltd | London | A rating |
| Astrid Technologies LTD | London | A rating |
| Astro 1 Limited | Ruislip | A rating |
| Astro Crushing and Screening Equipment Ltd | Twickenham | A rating |
| Astro Lighting Limited | Harlow | A rating |
| ASTRO TAPAS AND COCKTAIL BAR LTD | London | A rating |
| ASTROLUXE LIMITED | Birmingham | A rating |
| AstronauTx Limited | London | A rating |
| ASTROS-GR LTD | Ilford | A rating |
| Astroscale Ltd | Didcot | A rating |
| Astroten Ltd | London | A rating |
| ASTRUM MULTI ACADEMY TRUST | Romford | A rating |
| ASTS BRISTOL LIMITED T/A Chilli Masala | Bristol | A rating |
| ASTUDIO Ltd | London | A rating |
| Astute (Scotland) Limited | Forfar | A rating |
| Astute Data Systems Ltd | Canterbury | A rating |
| Astute Healthcare Limited | HItchin | A rating |
| Astute Ltd | Bournemouth | A rating |
| Astute Trading Limited | London | A rating |
| Astutis Ltd | CARDIFF | A rating |
| Astwood Bank Cricket Club | Redditch | A rating |
| ASTWOOD CONVENIENCE STORE | Worcester | A rating |
| ASTWOOD HS LTD T/A Astwood House Chinese Takeaway | Redditch | A rating |
| ASU Cars Limited | Birmingham | A rating |
| ASU Global Foundation UK Limited | London | A rating |
| ASU LONDON CENTRE FOR ADVANCED LEARNING | London | A rating |
| ASUFA Limited T/A Brook Green News & Post Office | London | A rating |
| Asurion Europe Ltd | Brentford | A rating |
| ASUSTEK (UK) LIMITED | HEMEL HEMPSTEAD | A rating |
| ASV (UK) Limited T/A Feast India | Leicester | A rating |
| ASV BRAINTREE LIMITED | Middlesbrough | A rating |
| ASV Clacton DT LTD | Clacton On Sea | A rating |
| ASV EOE LIMITED T/A SUBWAY | COLCHESTER | A rating |
| ASV LOWESTOFT LIMITED | NORWICH | A rating |
| ASV MARTLESHAM LIMITED | Ipswich, Suffolk | A rating |
| ASV TRADING LTD | SHEFFIELD | A rating |
| Asvacare Limited | Ilford | A rating |
| ASVSH ACCOUNTANCY SERVICES LTD | London | A rating |
| ASVY LTD T/A Costcutter | Northolt | A rating |
| ASW Repairs Limited | High Wycombe | A rating |
| Aswad Travels Limited | Stockport | A rating |
| ASWIN CHICKEN LTD | Colindale | A rating |
| Aswini Fernando | Surbiton | A rating |
| ASWO (UK) Ltd | Coventry | A rating |
| Asylum Models & Effects Limited | London | A rating |
| Asylum Retail Limited t/as Damaged Society | Derby | A rating |
| Asylum Welcome | OXFORD | A rating |
| Asymchem Limited | Sandwich | A rating |
| Asymmetry Art Foundation | London | A rating |
| Asymptote Labs | London | A rating |
| Asystec NI Limited | Omagh | A rating |
| ASZ SULLY LTD | Sully | A rating |
| AT Dent Limited | Boston | A rating |
| AT Digital Ltd | Hounslow | A rating |
| AT Engine Controls Ltd T/A ATEC Engineering Solutions | Manchester | A rating |
| AT GILL ENTERPRISES LTD | Luton | A rating |
| AT GLOBAL MARKETS (UK) LIMITED | London | A rating |
| AT HIRE LTD | Telford | A rating |
| AT HOME DELIVERY LTD | NORWICH | A rating |
| AT HOME LONDON LTD | Uxbridge, | A rating |
| At Home Support Services Ltd | Harlow | A rating |
| AT MANAGEMENT LIMITED | Leicester | A rating |
| AT Medics Limited | Great Missenden | A rating |
| At My Smile Studio Ltd | Irthlingborough | A rating |
| At Siam Limited | London | A rating |
| AT THE MOVIES LIMITED | London | A rating |
| At Your Side Care Ltd t/a GoodOaks Homecare - Bedford | Bedford | A rating |
| At-Tawheed Foundation | Stoke On Trent | A rating |
| AT&T ISTEL | London | A rating |
| AT3N LTD | London | A rating |
| AT71TH Ltd | London | A rating |
| ATA GROUP ACCOUNTANTS LTD | LONDON | A rating |
| ATA GROUP GLOBAL LTD | London | A rating |
| ATA HOME LTD | Colchester | A rating |
| ATA International Trade & Consultancy | Somerset | A rating |
| Ata Technique Ltd | London | A rating |
| ATA ULUSLARARASI DIS TICARET VE DEKORASYON LIMITED | London | A rating |
| ATAAKS LTD | Manchester | A rating |
| ATAC SOLUTIONS LTD | Hollingbourne, Maidstone | A rating |
| Ataccama UK Ltd. | London | A rating |
| ATAG Heating Technology UK Limited | West Malling | A rating |
| atai Life Sciences UK Ltd | London | A rating |
| ATAK ENGINEERING UK LTD | London | A rating |
| Atalanta Healthcare Services Limited | London | A rating |
| Atalaw Solicitors | London | A rating |
| Ataman Trading Limited | Wembley | A rating |
| ATAMATE CONTROLS LTD | Oxford | A rating |
| Atamate Ltd | Oxford | A rating |
| ATARIYA FOODS RETAIL (UK) LIMITED | Hove | A rating |
| Atariya Restaurant London Limited | London | A rating |
| ATASAN & CO LTD | London | A rating |