| Prophet plc | Meriden | A rating |
| Prophix UK Limited | Reading | A rating |
| Proplas 2008 Ltd | Kingswinford | A rating |
| Proplend Limited | Richmond | A rating |
| Propmedia Limited T/A Lettingaproperty.com | Warwickshire | A rating |
| PROPONENT U.K. LIMITED | BORDON | A rating |
| Proposition Rthapoe Ltd T/A Proposition | London | A rating |
| PROPOTEC LTD | BURWELL | A rating |
| Proprietary Association of Great Britain (PAGB) | London | A rating |
| Proprium Capital Management (UK) LLP | London | A rating |
| Propshop Ltd T/A Aircraft Restoration Company | Duxford | A rating |
| PROPTECH AERO LTD | Lee-On-The-Solent | A rating |
| PropTech Connect | London | A rating |
| PROPUS TECH LTD | LONDON | A rating |
| Proquant Estimating Limited | Macclesfield | A rating |
| ProQuest Information and Learning Limited | Cambridge | A rating |
| Proquest Solutions Limited | London | A rating |
| ProRehab Physio LTD | Crawley | A rating |
| PROS Europe Limited | London | A rating |
| Prosafe Offshore Ltd | Westhill | A rating |
| Prosapient | London | A rating |
| Proseed Property Limited | London | A rating |
| Proseed UK Ltd | London | A rating |
| Prosegur Security UK Ltd | Braintree | A rating |
| Prosek UK Limited | LONDON | A rating |
| Proserv UK Ltd | Westhill | A rating |
| PROSERVICES4U LIMITED | London | A rating |
| Proskauer Rose (London) LLP | London | A rating |
| Proskauer Rose (UK) LLP | London | A rating |
| Prosol IT (UK) Limited | llford | A rating |
| prosource.it | Aberdeen | A rating |
| prospect health Living care services Limited | Rotherham | A rating |
| Prospect Childcare Services Ltd | Leeds | A rating |
| Prospect Diagnostics Ltd | Dronfield | A rating |
| PROSPECT DLC LIMITED T/A The Poplars Inn | Trowbridge | A rating |
| Prospect Education (Technology) Trust | London | A rating |
| Prospect Farming | Exeter | A rating |
| Prospect Fire Limited | Dunmow | A rating |
| Prospect Medical Group | Newcastle Upon Tyne | A rating |
| Prospect Medical Practice | Norwich | A rating |
| Prospect Private Nursing Home | Ballymena | A rating |
| Prospect Sporting Insights Limited | London | A rating |
| Prospect Store Ltd | Oldham | A rating |
| Prospect Surgery | Middlesbrough | A rating |
| Prospect Training Services (Gloucester LTD) | Gloucester | A rating |
| Prospect Tree Healthcare | Wolverhampton | A rating |
| Prospector Pro Limited | Middlesborough | A rating |
| PROSPECTS DEVELOPMENT SERVICES LTD | LUTON | A rating |
| Prosper and Enterprise Limited | Oxted | A rating |
| Prosper Care Solutions | Wolverhampton | A rating |
| Prosper Robotics Ltd | London | A rating |
| PROSPERA CAPITAL PARTNERS (WEST) LTD | London | A rating |
| Prosperia Consulting Ltd | London | A rating |
| Prosperia Limited | London | A rating |
| Prosperise Capital LLP | London | A rating |
| Prosperity Care and Wellbeing | Gloucester | A rating |
| PROSPERITY CONSULTANTS LIMITED | Crawley | A rating |
| Prosperity Finance Services Limited | London | A rating |
| Prosperity Finance UK Ltd | London | A rating |
| Prosperity Housing Group Limited T/A Paula's House | Smethwick | A rating |
| Prosperity Institute Limited | London | A rating |
| Prosperity Law LLP | Manchester | A rating |
| Prosperity Network Ltd | Warrington | A rating |
| Prosperity Plus Healthcare Limited | Altrincham | A rating |
| Prospero Group Limited | London | A rating |
| Prospero Int. Consulting | Windsor | A rating |
| Prospero Projects Ltd | BROADSTONE | A rating |
| ProsperoHub Ltd | London | A rating |
| Prosperon Networks Ltd | Worthing | A rating |
| Prosperous Care Ltd | Leicester | A rating |
| Prosperous Jade Feast Ltd T/A JRC Global Buffet | Ilford | A rating |
| Prospira Global Ltd | London | A rating |
| PROSPIRE TECHNOLOGIES LTD | Hull | A rating |
| ProSports Cars t/a Hull Seahawks Ltd | Hull | A rating |
| Prospot Limited | Tamworth | A rating |
| Prostate Cancer Research | London | A rating |
| Prostate Cancer UK | London | A rating |
| Prostate Care Ltd | Abingdon | A rating |
| ProStock Vets Ltd | Carmarthen | A rating |
| Prosum Medical Limited | Uxbridge | A rating |
| PROSURE ASSOCIATES LIMITED | Manchester | A rating |
| Prot Ltd | Leicester | A rating |
| Protagonist Pictures Ltd | London | A rating |
| Protagoras Group | London | A rating |
| PROTAX CONSULTANTS LTD | London | A rating |
| PROTAX WM LTD | Burton-On-Trent | A rating |
| Protea Associates Ltd | Swindon | A rating |
| Protea Care Homes (Kent) Ltd | Coventry | A rating |
| Protea Wal Limited | Shepperton | A rating |
| Protean Electric Limited | Farnham | A rating |
| Protec Fire Detection plc | Nelson | A rating |
| Protec Group Ltd | Warwick | A rating |
| Protec Security Group NW Limited | Royton | A rating |
| ProTech Innovative Solution Limited | NEW MALDEN | A rating |
| Protech SG Ltd | Ilford | A rating |
| Protech Stainless Ltd | Bedford | A rating |
| Protech Team Ltd | Hainault | A rating |
| PROTECHNING LIMITED | London | A rating |
| Protecht IV Ltd | Harlow | A rating |
| Protect Fire Ltd | Edgware | A rating |
| Protect the Wild LTD | London | A rating |
| Protectafile Ltd | Bolton | A rating |
| ProtectaPet | Newcastle under Lyme | A rating |
| Protected Trust Services Ltd | Bournemouth | A rating |
| ProtectHand Care LTD | Harold Wood, Romford | A rating |
| Protecting People Ltd | Thetford | A rating |
| Protection Approaches | London | A rating |
| Protection Dogs Worldwide Ltd | Hull | A rating |
| Protection UK Ltd | Stockport | A rating |
| Protective Care Group Limited | Elkstone | A rating |
| Protective Sportswear Ltd | Walsall | A rating |
| Protector Insurance | Manchester | A rating |
| Protegrity Europe Limited | London | A rating |
| Protein Agency Group Ltd | London | A rating |
| Protein Carbs N Fats Ltd T/A Pepe's Piri Piri Greenock | Greenock | A rating |
| Protein Technologies Ltd | Manchester | A rating |
| Proteintech Europe Limited | Manchester | A rating |
| Protek Group Limited | Edenbridge | A rating |
| Proteo Ltd | Norwich | A rating |
| Proteotype Diagnostics Ltd | Cambridge | A rating |
| Proteus Facades Limited | Skelmersdale | A rating |
| Proteus Tidal (Scotland) Limited | Edinburgh | A rating |
| PROTEXNET SOLUTIONS LTD | Bournemouth | A rating |
| Protim Solignum Limited | Marlow | A rating |
| Protium Green Solutions Ltd | London | A rating |
| Protium MS Ltd | Nether Alderley | A rating |
| Protiviti Limited | London | A rating |
| Protize Ltd | London | A rating |
| Proto Labs Limited | Telford | A rating |
| ProtoCool Limited | Aldermaston | A rating |
| PROTON AVIATION CAPITAL LTD | London | A rating |
| Proton Payments Limited | Warrington | A rating |
| Proton Technologies Ltd | London | A rating |
| Protonera | Cambridge | A rating |
| PROTOPAPAS LLP | London | A rating |
| Protostar Group Limited | London | A rating |
| Prototrim Manufacturing Ltd | Milton Keynes | A rating |
| Prototype Electronics Ltd | Dorchester | A rating |
| Proud Build UK Limited | London | A rating |
| Proud Robinson Ltd | Brighton | A rating |
| Prova Health Limited | Bermondsey | A rating |
| Provan Sports Ltd | Renfrewshire | A rating |
| Provar Limited | London | A rating |
| Prove Identity Ltd | London | A rating |
| Proveden Ltd | London | A rating |
| Provek Ltd | Newbury | A rating |
| Provelio Ltd | Bristol | A rating |
| PROVEN ACKNOWLEDGED TRADES LTD | HARROW | A rating |
| Proven Project (District Heating) Ltd | London | A rating |
| Proven Project Construction Ltd | London | A rating |
| Proven Strategy Ltd | Manchester | A rating |
| PROVENANCE HOTELS LIMITED | Wetherby | A rating |
| Provenance Inns Limited | Harrogate | A rating |
| Provenance Partners Limited | London | A rating |
| Provenca Capital Limited | London | A rating |
| Provence Holidays Ltd | London | A rating |
| Provenir (UK Ltd.) | Birmingham | A rating |
| PROVENTEQ LIMITED | Reading | A rating |
| Proventus (UK) Ltd | Leeds | A rating |
| PROVENTUS GLOBAL LTD | Morden | A rating |
| ProvenWorks | Reading | A rating |
| Provide A Meal | Portsmouth | A rating |
| Provide Community Interest Company | Colchester | A rating |
| Provide Homecare Ltd | Ipswich | A rating |
| PROVIDE SESS LTD | Winnersh | A rating |
| Providence Care Solutions | Cheshunt | A rating |
| Providence Centered Care Ltd | Erith | A rating |
| Providence Dental Limited | Folkestone | A rating |
| Providence Equity LLP | London | A rating |
| Providence Hotels Limited | Bath | A rating |
| Providence Linc United Services | London | A rating |
| Providence Lodge Ltd | Maidstone | A rating |
| Providence Row | London | A rating |
| Providence Surgery | Bournemouth | A rating |
| Provident Holdings Limited | Gants Hill | A rating |
| PROVIDER24/7 LIMITED | London | A rating |
| Providing Care Limited | Warrington | A rating |
| Proview Accounting Limited | London | A rating |
| Provility Software Limited | Aldershot | A rating |
| Provincia Ltd | London | A rating |
| Provincial Care Services Agency | Carryduff | A rating |
| Provine Ltd | Heckmondwike | A rating |
| Provisio Care Group limited | Blackpool | A rating |
| Provision Care Ltd | Leicester | A rating |
| Provision Construction Ltd. | Hayes | A rating |
| Provision Vehicle Cameras Ltd | Kent | A rating |
| Provision Vehicle Cameras Ltd t/a CameraMatics UK | London | A rating |
| Provogue Ltd | Norwich | A rating |
| Prowess Security Solutions Ltd | Dundee | A rating |
| Prowise Healthcare Ltd | Uxbridge | A rating |
| ProWood Finance Ltd | Coventry | A rating |
| PROXIMA A LIMITED | LONDON | A rating |
| PROXIMIE LIMITED | ALTRINCHAM | A rating |
| Proximity Insight Ltd | Brighton | A rating |
| Proximo Spirits UK Ltd | London | A rating |
| PROXIMUS SOLUTIONS LIMITED | Eccles,Manchester | A rating |
| PROXY RECRUITMENT & SERVICES LTD | Southampton | A rating |
| Proxy Studio Limited | London | A rating |
| Proxymity Limited | London | A rating |
| Prozomix Limited | Haltwhistle | A rating |