| Armstrong Integrated Limited | Manchester | A rating |
| Armstrong Logistics Ltd | Lutterworth | A rating |
| Armstrong Properties (Northwest) Limited | Bolton | A rating |
| Armstrong Teasdale Limited | London | A rating |
| ARMSTRONG TRANSACTION SERVICES LIMITED | LONDON | A rating |
| Armtech Global Services Limited | Milton Keynes | A rating |
| Armthorpe Specsavers Limited | Doncaster | A rating |
| Armtrack Group Ltd | Dartford | A rating |
| Armundia United Kingdom Ltd | London | A rating |
| Armz Limited | Leatherhead | A rating |
| ARN BROTHERS LTD T/A PREMIER | CANTERBURY | A rating |
| ARN CARE LTD | Hayes | A rating |
| ARN Hoxton Limited | London | A rating |
| ARN Supplies Ltd | London | A rating |
| ARNAV CONSTRUCTION LTD | London | A rating |
| Arnero Limited | Manchester | A rating |
| Arney Fender Katsalidis Limited | London | A rating |
| Arnlea Systems Limited | ABERDEEN | A rating |
| ARNO GB Limited | Bristol | A rating |
| ARNO HOMES LTD | Slough | A rating |
| Arnold & Porter Kaye Scholer (UK) LLP | London | A rating |
| Arnold Clark Automobiles Limited | Glasgow | A rating |
| ARNOLD MAGNETIC TECHNOLOGIES LIMITED | Sheffield | A rating |
| Arnold Medical Centre | Blackpool | A rating |
| Arnold Murati Technical Services LTD | Rotherham | A rating |
| Arnoldarmsbarby Limited | Rugby | A rating |
| Arnolds Pharmacy | Bideford | A rating |
| Arnot St. Mary CofE Primary School | Liverpool | A rating |
| Aro Finance Limited | Manchester | A rating |
| ARO INTERIORS LIMITED | Manchester | A rating |
| AROGYA CONNECTED HEALTH LTD | Salford | A rating |
| AROHA TRADE LTD | Coventry | A rating |
| Arohana Food and Wine Ltd | London | A rating |
| Arohana Limited | Dagenham | A rating |
| AROKI & SON LIMITED | LONDON | A rating |
| Aroma Cafe Soham Limited | Ely | A rating |
| Aroma Care People Ltd | Lutterworth | A rating |
| Aroma Cocepts Ltd | Leicester | A rating |
| AROMA COFFEE HOUSE (WM) LTD TA Aroma | Birmingham | A rating |
| Aroma events Ltd | Hayes | A rating |
| AROMA GRILL LIMITED | Torquay | A rating |
| AROMA GRILL PAIGNTON LTD | Paignton | A rating |
| Aroma Herts Ltd | Radlett | A rating |
| Aroma Ice Taunton Ltd | Taunton | A rating |
| Aroma Indian Restaurant | Gloucester | A rating |
| Aroma Lounge Kent Limited | Sittingbourne | A rating |
| Aroma Newton Ltd | Newton Abbot | A rating |
| Aroma of India (Sri Sai) Ltd | Northampton | A rating |
| AROMA TANDOORI LTD | LONDON | A rating |
| Aromaria UK LTD | London | A rating |
| AROMATICA SPICE LIMITED TA Quality Tandoori | Edenbridge | A rating |
| Arome Central Ltd | London | A rating |
| Aromi Caffe' Limited | Cambridge | A rating |
| Arondite Ltd | London | A rating |
| Aronel Cottage Care Home Ltd | Bognor Regis | A rating |
| ARORA FOODS LIMITED | Stoke-on-Trent | A rating |
| ARORA LODHI HEATH | LONDON | A rating |
| Arora Management Services Limited | Hounslow | A rating |
| Arora Superstore Ltd T/A Dedworth food and wine - Dedworth Convenience Store | Windsor | A rating |
| Aros Kapital Ltd | London | A rating |
| AROS MARINE LTD | Hampshire | A rating |
| AROSA TRADING LIMITED | Sheffield | A rating |
| Around Noon Limited | Newry | A rating |
| Around the clock care agency Ltd | Camberley | A rating |
| AROUND THE CLOCK HEALTHCARE LTD | Milton Keynes | A rating |
| AROUNDTOWN REAL ESTATE MANAGEMENT (UK) LIMITED | London | A rating |
| Aroxo Ltd | London | A rating |
| Aroy D Thai Ltd | Ely | A rating |
| ARP Dental Care Ltd t/a Habashi Dental | Abbey Wood | A rating |
| ARPAKOR LTD | London | A rating |
| ARPPAS LLP | SEVENOAKS | A rating |
| Arqit Limited | London | A rating |
| Arqiva Ltd | Winchester | A rating |
| ARQuant Management Limited | London | A rating |
| ARR Investment Partners Ltd | London | A rating |
| ARR Retail Ltd | Plymouth | A rating |
| Arrakis Technologies Limited | London | A rating |
| Arralis Technologies Ltd | Chippenham | A rating |
| Arran Action Care Ltd | Isle of Arran | A rating |
| ARRAN FOODS LIMITED | Oldham | A rating |
| Arran Healthcare Limited | London | A rating |
| Arran Medical Group | Isle of Arran | A rating |
| Arranmore Park Rest Home Ltd | Burscough | A rating |
| Array Training Limited | Aberdeen | A rating |
| Arrazzaq Consultancy Limited | Lincolnshire | A rating |
| ARRBRA LIMITED | Harrow | A rating |
| Arren & Aneka Limited | Kent | A rating |
| Arreoblue Ltd | London | A rating |
| Arri Holdings Limited | Ilford | A rating |
| Arria Data2Text Limited | Aberdeen | A rating |
| Arriba Technologies Ltd | Cambridge | A rating |
| Arris Global Limited | Shipley | A rating |
| Arriva Limited | Sunderland | A rating |
| Arriva Rail London Ltd | London | A rating |
| Arriva UK Bus Limited | Thurmaston | A rating |
| Arrival Education | Leighton Buzzard | A rating |
| Arrk Limited | Manchester | A rating |
| ARRK Product Development Group Ltd | Quedgeley | A rating |
| ARRO SERVICE LIMITED | Lancashire | A rating |
| ARROW BOURNEMOUTH LIMITED | Southampton | A rating |
| Arrow Business Communications Ltd | Liverpool | A rating |
| Arrow Capital Europe Limited | London | A rating |
| Arrow Convenience Limited | Southampton | A rating |
| Arrow Dental Practice | London | A rating |
| ARROW DIGITAL SPACE LTD | London | A rating |
| ARROW EMBROIDERY LIMITED | Slough | A rating |
| ARROW ENERGY MARKETS (UK) LIMITED | London | A rating |
| Arrow Enterprise Computing Solutions Ltd | Harrogate | A rating |
| Arrow Global Limited | Manchester | A rating |
| Arrow International Media Limited | London | A rating |
| Arrow Medical Limited | Kington | A rating |
| Arrow Recycling Limited | Birmingham | A rating |
| Arrow service centre | Dagenham | A rating |
| ARROW SHIPPING (UK) LTD | London | A rating |
| Arrow Supermarket Ltd | Southampton | A rating |
| ARROW WHOLESALE GROUP LTD | SOUTHAMPTON | A rating |
| Arrowfield Veterinary Practice Ltd | KINGTON | A rating |
| ARROWHEAD INTERNATIONAL LTD | London | A rating |
| ARROWMEAD LIMITED | London | A rating |
| Arrows Group Professional Limited | London | A rating |
| Arrows Integrated Contact Centre Ltd | London | A rating |
| ARROWSMITH REST HOME LIMITED | PRESTON | A rating |
| ARRP TRADING LIMITED | Exeter | A rating |
| ARRRRRRRGH LTD | London | A rating |
| ArryBarry Limited | Wembley | A rating |
| ARS Cardiff Limited TA Purple Poppadom | Cardiff | A rating |
| ARS CONSULTANCY LTD | Amersham | A rating |
| ARS FOOD LTD | Rainham | A rating |
| ARS INTERNATIONAL LTD | Thornton Heath | A rating |
| ARS Jewels limited | Surrey | A rating |
| ARS Mini Market | London | A rating |
| ARS Traders Limited | Winchester | A rating |
| ARS UK FOOD LIMITED | Northampton | A rating |
| ARS Wholesaler Limited | Greenford | A rating |
| ARSAK LTD | London | A rating |
| Arsenal Football Club | London | A rating |
| Arsenal Women Football Club Limited | London | A rating |
| ARSG LTD | London | A rating |
| ARSH ENTERPRISES LTD | Manchester | A rating |
| Arsh Heating Limited | Erith | A rating |
| Arsh Innovative IT Ltd | Rugby | A rating |
| Arsha Construction Ltd | Brighton | A rating |
| ARSHAD & SONS ENTERPRISES LTD | Bury | A rating |
| Arshad Brother & Co Veg Ltd | East Manchester | A rating |
| Arshdeep Construction Ltd | Hayes | A rating |
| Arshed and Co Solicitors | Manchester | A rating |
| ARSHYA LTD | Putney | A rating |
| ARSS PROPERTIES LTD | London | A rating |
| Art & Assembly Ltd. | London | A rating |
| Art Africa Ltd | London | A rating |
| Art And Industry Ltd | London | A rating |
| ART AND SCIENCE UK LIMITED | London | A rating |
| ART Convenience Store Limited | Cambridge | A rating |
| ART EVENTS AND MEDIA LTD | London | A rating |
| Art Gazette Global Limited | London | A rating |
| Art Genpower Solutions Ltd | Wood Green, London | A rating |
| ART Group Services UK Limited | London | A rating |
| ART HOUSE LONDON STUDIO LTD | Thornton Heath | A rating |
| ART INVESTMENT AND TECH LTD | LONDON | A rating |
| Art Market Minds Ltd | Borehamwood | A rating |
| Art Media Advertising Limited T/A Sam Karandeniya Photography | Bristol | A rating |
| Art Money UK Limited | London | A rating |
| Art of Cloud Ltd | Horsforth | A rating |
| Art of the Puppet Ltd | London | A rating |
| Art Partner Productions Limited | LONDON | A rating |
| Art Play London Limited | London | A rating |
| Art Practice Ltd | London | A rating |
| Art Retail Ltd | Stenhousemuir | A rating |
| Art Services Grants Ltd | ILFORD | A rating |
| ART SWEETS LIMITED | Luton | A rating |
| Art Technologies Limited | London | A rating |
| Art-I-Check Ltd | London | A rating |
| Art-Invest Real Estate Management UK Limited | London | A rating |
| art-K | Ashtead | A rating |
| ART.SY UK, LTD | London | A rating |
| ART&GRAFT | London | A rating |
| ArtAML Limited | London | A rating |
| Artax Capital Limited | Hertford | A rating |
| ARTBLOC COMPANY LTD | Coventry | A rating |
| Artbox London | Artbox London | A rating |
| Artbox London | London | A rating |
| ARTCORE LIMITED | Derby | A rating |
| Arteak Limited | London | A rating |
| Artec Fire Ltd | Manchester | A rating |
| Arteche UK Limited | Manchester | A rating |
| ARTECO LIMITED | LONDON | A rating |
| Artefact UK LTD | London | A rating |
| ARTEK SERVICES & SOLUTIONS LIMITED | Southampton | A rating |
| Artel Scaffolding Limited | London | A rating |
| Artel31 Ltd | Chippenham | A rating |
| Artelia Projects UK Limited | London | A rating |
| Artelium Limited | Hassocks | A rating |
| Artelium Wine Estate LLP | Streat | A rating |
| Artellite Ltd | London | A rating |
| Artemest UK Limited | London | A rating |
| Artemis Beauty Ltd | London | A rating |
| Artemis Consultants Limited | Litlington | A rating |
| Artemis Energy Limited | London | A rating |
| Artemis Investment Management LLP | London | A rating |
| Artemis Optical Limited | Plymouth | A rating |