| Pro Sentry Ltd | Harrow | A rating |
| PRO SPALL LIMITED | Manchester | A rating |
| PRO Structures Ltd | Bristol | A rating |
| PRO SUSTAINABILITY LTD | Wantage | A rating |
| Pro Syndicate Ltd | BARKING | A rating |
| Pro System Services Limited | Ruislip | A rating |
| PRO TAX ACCOUNTANCY SERVICES LIMITED | Ipswich | A rating |
| PRO TAX PLUS ACCOUNTANTS LUTON LTD | Dunstable | A rating |
| Pro Tax Plus Accountants Maidstone | Romford | A rating |
| PRO TAX PLUS LEWISHAM LTD | London | A rating |
| Pro Weee Ltd | Huddersfield | A rating |
| PRO-B CONSULTANCY LTD | London | A rating |
| Pro-Fit Green Energy Ltd | Poole | A rating |
| Pro-Force Limited | Canterbury | A rating |
| Pro-Force Ltd | Canterbury | A rating |
| Pro-info consulting UK LTD | Slough | A rating |
| Pro-Manchester Limited | Manchester | A rating |
| Pro-Servicing Ltd | Wokingham | A rating |
| Pro-Taxman Limited | Hounslow | A rating |
| PRO-YEN SERVICES COMPANY LTD | Birmingham | A rating |
| PROACC ASSOCIATES | MANCHESTER | A rating |
| ProAce Healthcare Services Ltd | Newcastle Upon Tyne | A rating |
| Proace Ltd | Stafford | A rating |
| Proact Business Solutions Limited | Sutton-in-Ashfield | A rating |
| Proact IT UK Limited | Chesterfield | A rating |
| Proactive Accounting Services Ltd | Belfast | A rating |
| Proactive Chartered Accountants Limited | Belfast | A rating |
| PROACTIVE CONSTRUCTION MANAGEMENT LTD | Slough, England, | A rating |
| Proactive Extreme Cleaning Ltd t/a Extreme Cleaning | Slough | A rating |
| Proactive Facilities Management Ltd | Slough | A rating |
| PROACTIVE RESOURCE GROUP LTD | London | A rating |
| PROACTIVEUZ LTD | LIMEHOUSE | A rating |
| ProAmpac Elsham plc | Brigg | A rating |
| ProAmpac Grimsby Limited | Grimsby | A rating |
| ProAmpac Lincoln Limited | Lincolnshire | A rating |
| Proaptus Ltd | Derby | A rating |
| ProArch IT Solutions Limited | London | A rating |
| Proark UK Hotels Ltd | Telford | A rating |
| proAV Limited | Egham | A rating |
| Proback Clinic Victoria Ltd | London | A rating |
| PROBASHI KOLLAN FOUNDATION PKF | London | A rating |
| Probatech Ltd | London | A rating |
| Probe Test Solutions Limited | Hamilton | A rating |
| Probing Minds Limited | St. Ives | A rating |
| Probita Solutions Limited | Stone | A rating |
| Probitas Enterprise Solutions Limited | West Haddon | A rating |
| Probiz Accountants Ltd | Manchester | A rating |
| Probiz Synergy Ltd | Gillingham | A rating |
| Problems Solved Ltd. | Chalfont St Giles | A rating |
| Probo Medical Ltd | Gloucester | A rating |
| PROBUSINESS LTD | Wells | A rating |
| Procam CP Limited | Cambourne | A rating |
| PROCARE DOMICILIARY SERVICES LTD | Bourne | A rating |
| Procare Health Limited | Haslemere | A rating |
| PROCARE HEALTHCARE LTD | Oxford | A rating |
| Procare Nursing Agency Limited | Canton | A rating |
| ProCare Nursing Agency Ltd | Cardiff | A rating |
| Procare Property Management Limited | Bristol | A rating |
| PROCARE TEAM LTD | London | A rating |
| Procare UK Limited | Bristol | A rating |
| Procare Wales Limited | Rhyl | A rating |
| PROCAT INTERNATIONAL LTD | LONDON | A rating |
| Proceed Data Management Limited | London | A rating |
| Procentia Limited | Bristol | A rating |
| PROCEPT BioRobotics UK Ltd | Derby | A rating |
| Process Automation and Calibrations Limited | Belfast | A rating |
| Process Decontamination Systems Limited t/a ProDecon | Nantwich | A rating |
| Process Flow Intelligence Ltd | Manchester | A rating |
| Process Integration Ltd | Altrincham | A rating |
| Process Plant Computing Limited | Beaconsfield | A rating |
| Process Safety Solutions Limited | Aberdeen | A rating |
| Process360 Ltd | Sutton | A rating |
| Processia Solutions Ltd | Coventry | A rating |
| Processors and Growers Research Organisation | Peterborough | A rating |
| ProCheckUp Limited | Portsmouth | A rating |
| Procility Global Ltd | London | A rating |
| Proclean 1987 Ltd | Stockport | A rating |
| Proclean Cleaning maintenance services ltd | London | A rating |
| Proclean Equipment and Services Ltd | Woking | A rating |
| Proclinical | London | A rating |
| Proco Consultants Ltd | Brighton | A rating |
| Procode Technology Limited | Chandlers Ford | A rating |
| ProColombia - Colombian Embassy in the UK | London | A rating |
| Procom Europe | Milton Keynes | A rating |
| Procon Wind Energy Limited | Warwick | A rating |
| Proconect DMT Construct Ltd | Bristol | A rating |
| ProConvey Limited | Plymouth | A rating |
| ProCook Limited | Gloucester | A rating |
| Procore UK Limited | London | A rating |
| Procter & Gamble Limited | Surrey | A rating |
| Proctor & Hobbs Limited | Bradford | A rating |
| Proctor and Matthews Limited | London | A rating |
| Proctor Process Plant Ltd | Burnley | A rating |
| PROCTOR RESIDENTIAL CARE HOME | BRISTOL | A rating |
| PROCURATO LTD | London | A rating |
| Procure Care Providers Limited | Nottingham | A rating |
| Procure Plus Holdings Limited | Manchester | A rating |
| Procurement Direct Ltd T/A Nexus Conference | London | A rating |
| Procurement Leaders Limited | London | A rating |
| ProcurePro UK Limited | London | A rating |
| ProcureTech Limited | London | A rating |
| Procurious Limited | GUILDFORD | A rating |
| PRODA LTD | London | A rating |
| PRODAPT (UK) LIMITED | READING | A rating |
| Prodapt Consulting (UK) Limited | Reading | A rating |
| PRODCO PRODUCTIONS LTD | London | A rating |
| PRODE PROPERTY DEVELOPMENT LTD | Coventry | A rating |
| Prodege UK, Ltd | London | A rating |
| Prodent Group Limited T/A Dental by Design | London | A rating |
| Prodent Spanish Place Limited | London | A rating |
| PRODHKS LTD | Horley | A rating |
| Prodigi (UK) Ltd | Alton | A rating |
| Prodigious UK Limited | London | A rating |
| Prodigy Finance Limited | London | A rating |
| Prodo Digital Marketing Limited | Chester | A rating |
| PRODO SOCIAL SOFTWARE LTD | Chester | A rating |
| Prodrive Holding Limited | Banbury | A rating |
| Prodtex Ltd | Bristol | A rating |
| Produce Investments Ltd | Peterborough | A rating |
| Producers Direct | London | A rating |
| Product Compliance Specialists Limit | Aylesbury | A rating |
| Product Marketing Alliance Ltd | London | A rating |
| Product Service Health (PSH) Ltd | Croydon | A rating |
| Producta Enterprises Ltd T/A Haute Dolci Perth | Perth | A rating |
| Productboard UK Ltd | Reading | A rating |
| Production Resource Group UK Ltd | Longbridge | A rating |
| Productive Machines Limited | Rotherham | A rating |
| Productive Partners Limited | Bedford | A rating |
| ProductLife Ltd | CAMBRIDGE | A rating |
| PRODUCTOO LIMITED | London | A rating |
| PRODUCTSDEN LTD | Leicester | A rating |
| PRODYNA UK Ltd | London | A rating |
| ProEconomy Ltd | Milton Keynes | A rating |
| Prof-care Ltd | Sheffield | A rating |
| PROFECTUS LETTINGS LIMITED | Birmingham | A rating |
| PROFERENCE LTD | COVENTRY | A rating |
| Professional Advantage Ltd | London | A rating |
| PROFESSIONAL AESTHETICS ACADEMY LTD | Birmingham | A rating |
| Professional Antenatal Services Limited t/a Meet Your Miracle | Doncaster | A rating |
| Professional Beauty Systems Ltd | Renfrew | A rating |
| Professional Care Ltd | Leeds | A rating |
| Professional Care Support Services Ltd. | Mitcham | A rating |
| Professional Carers Wirral Ltd | Wallasey | A rating |
| PROFESSIONAL CLIP AND TRIM | BIRMINGHAM | A rating |
| Professional Construction Design Services Limited | Chesham, | A rating |
| Professional Development Group | London | A rating |
| PROFESSIONAL DRYCLEANERS LIMITED | London | A rating |
| PROFESSIONAL ENERGY SERVICES LIMITED | Milton Keynes | A rating |
| Professional Footballers Association | Bishopsgate | A rating |
| Professional Game Match Officials Limited | London | A rating |
| Professional Healthcare Services Limited | Northampton | A rating |
| Professional Healthcare UK Ltd | London | A rating |
| Professional Home Care Ltd | Woodstock | A rating |
| PROFESSIONAL LEARNING AND CONSULTING HUB LIMITED | HARROW | A rating |
| Professional Property Services ltd | Birmingham | A rating |
| Professional Quality Management Services Limited | Bedworth | A rating |
| PROFESSIONAL REFRIGERATION LTD | Smethwick | A rating |
| Professional Reviews LTD T/A ReviewSolicitors | Nottingham | A rating |
| Professional Services Limited Partnership | London | A rating |
| Professional Social Networks Ltd | Shaftsbury | A rating |
| Professional squash association | Leeds | A rating |
| Professional Thai Food Ltd | Rugby | A rating |
| PROFESSIONAL UK ESTATE AGENT LTD | HARROW | A rating |
| PROFESSIONALS CARE FOR YOU LIMITED | KING S LYNN | A rating |
| Professor Puzzle Limited | Twickenham | A rating |
| Professor Puzzle Ltd | Twickenham | A rating |
| PROFF GLOBAL LTD | Bristol | A rating |
| PROFFER SOLUTION LTD | Oldbury | A rating |
| Profici NW Ltd | Liverpool | A rating |
| PROFICIENCY DESIGN & BUILD LTD | London | A rating |
| PROFICIENT COMMUNITY CARE SERVICES LIMITED | Ipswich | A rating |
| Proficient Medical Limited | Blackburn | A rating |
| Proficio Consultants Limited | ALDERSHOT | A rating |
| Profile Books Limited | London | A rating |
| Profile Financial Solutions Ltd | Preston | A rating |
| Profile Software (UK) Limited | London | A rating |
| Profile Solutions UK Limited | Leicester | A rating |
| Profiles Creative Limited | London | A rating |
| Profiles Personnel | Farnham | A rating |
| ProfileTree | Belfast | A rating |
| Profilm Advanced Materials Ltd | Englefield Green | A rating |
| Profinda Limited | London | A rating |
| Profisee Software UK Limited | London | A rating |
| PROFITAX ACCOUNTANCY LIMITED | London | A rating |
| Profitpath Business Consulting Ltd | Sutton | A rating |
| PROFITROOM LTD | London | A rating |
| PROFITWISE CONSULTANTS LTD | Barking | A rating |
| Profix Builders Ltd | London | A rating |
| PROFONE LTD | NOTTINGHAM | A rating |
| Proforce Security Services Limited | Sheffield | A rating |
| PROFORCE TECHNICAL LTD | Hull | A rating |
| ProForecast Ltd | Sunderland | A rating |
| ProForest Ltd | Oxford | A rating |
| PROFOUND CONSULTANTS LIMITED | Rochdale | A rating |
| Profound Housing and Support Ltd | Gloucester | A rating |
| PROFOUND PROPERTIES LIMITED | Ilford | A rating |
| PROFOUNDLY U.K. LTD | London | A rating |
| PROFSHINE LTD | London | A rating |
| Profuse Care Ltd | Welwyn Garden City | A rating |
| PROGAS 247 LTD | Birmingham | A rating |