| PVH UK Group Limited | London | A rating |
| Pylon Technologies UK Ltd | London | A rating |
| Pyronix Limited | Rotherham | A rating |
| Pythian UK Limited | London | A rating |
| PZ Cussons Plc | Manchester | A rating |
| Q4 LONDON LIMITED | LONDON | A rating |
| QA Limited | London | A rating |
| QAD EUROPE LTD | Birmingham | A rating |
| Qantas Airways Limited (UK) | London | A rating |
| Qantas Cabin Crew (UK) Ltd | Hounslow | A rating |
| Qatalyst Partners Limited | London | A rating |
| Qatar Airways Group Q.C.S.C. | London | A rating |
| Qatar National Bank (Q.P.S.C.), London Branch | London | A rating |
| QATARI DIAR EUROPE LLP | LONDON | A rating |
| Qatro UK Ltd | London | A rating |
| QBE Management Services (UK) Limited | London | A rating |
| Qcom Limited | London | A rating |
| QED Investors UK Limited | London | A rating |
| Qera Marketing Ltd | London | A rating |
| QG Construction UK Limited | London | A rating |
| QIAGEN Limited | Manchester | A rating |
| QIC European Investment Services Limited | London | A rating |
| Qin's Health Wellness Ltd | London | A rating |
| QinetiQ Group Plc | Farnborough | A rating |
| Qioptiq Photonics Limited | Southampton | A rating |
| QlikTech UK Ltd | Winnersh | A rating |
| QODEA LIMITED | Manchester | A rating |
| Qogita UK Ltd | London | A rating |
| Qorvo UK Ltd | Theale | A rating |
| QPC Limited | Mold | A rating |
| QS Quacquarelli Symonds Ltd | London | A rating |
| QSI Group Limited | Billingham | A rating |
| QUADIENT UK LIMITED | London | A rating |
| Quadreal UK Services Limited | London | A rating |
| Quadrum Real Estate LLP | London | A rating |
| Qualcomm Technologies International Ltd | Cambridge | A rating |
| Qualitest Software Testing Limited | London | A rating |
| Quality Pack Limited | Harlow | A rating |
| Quant Network Limited | London | A rating |
| Quantcast Limited | London | A rating |
| QuantCo Holding Ltd | London | A rating |
| Quanticate Interntional Limited | Hitchin | A rating |
| Quantiphi Limited | Reading | A rating |
| Quantitative Brokers UK Limited | London | A rating |
| Quantitative Risk Management Ltd | London | A rating |
| Quantium Limited | London | A rating |
| Quantum Consumer Solutions Pvt. Ltd | London | A rating |
| Quarto Publishing plc | London | A rating |
| Qubix International Ltd | Woking | A rating |
| Quera Computing UK Limited | Didcot | A rating |
| Quest Global Engineering Limited | Derby | A rating |
| QUICK Corp. London Branch | London | A rating |
| Quick International Couriers (UK) Limited | Uxbridge | A rating |
| QUICK LINK CONSULTANCY LIMITED | Rainham | A rating |
| Quick Release (Automotive) Limited | Leigh on Sea | A rating |
| Quidie limited t/a Fernovo | Croydon | A rating |
| Quilter Business Services Ltd | London | A rating |
| Quilvest Capital Partners UK Limited | London | A rating |
| Quinn Emanuel Urquhart & Sullivan UK LLP | London | A rating |
| QUINNOX LIMITED | LONDON | A rating |
| Quintessentially UK Ltd | London | A rating |
| Quinyx UK Limited | London | A rating |
| Quiq Limited | Elstead Surrey | A rating |
| Quizlet Limited | London | A rating |
| QUL Technologies Limited | Waterloo | A rating |
| Qumu Ltd | London | A rating |
| Qumulo Limited | Crewe | A rating |
| Quod Financial Ltd | London | A rating |
| Quorum Cyber Security Limited | Edinburgh | A rating |
| QVC UK | London | A rating |
| Qwilt UK Limited | London | A rating |
| QX Limited | North Yorkshire | A rating |
| R & M Clarkson Safety Ltd | Bristol | A rating |
| R P S Group Limited | Abingdon | A rating |
| R SYSTEMS COMPUTARIS INTERNATIONAL LIMITED | Waterlooville | A rating |
| R Twining & Co Ltd | Andover | A rating |
| R.L. Polk UK Limited | London | A rating |
| R.M.Williams (UK) Limited | London | A rating |
| R.S. STOLL AND COMPANY U.K. | Ruislip, | A rating |
| R/GA Media Group Limited | London | A rating |
| R&F Properties QS (UK) Co Ltd | London | A rating |
| R2 Global Recruitment Services LTD | Gateshead | A rating |
| R3 Limited | London | A rating |
| Rabobank London | London | A rating |
| Racing Bulls S.p.A. | Tilbrook | A rating |
| Rackspace Limited | Hayes | A rating |
| Radaaco UK Ltd | London | A rating |
| Radentia Technologies Ltd | London | A rating |
| Radial Commerce Limited | Oldham | A rating |
| Radical Media Limited | London | A rating |
| Radicon Transmission UK Limited | Elland | A rating |
| Radiodetection Limited | Bristol | A rating |
| RADISYS UK LIMITED | Bracknell | A rating |
| Radley + Co. Limited | London | A rating |
| Radwell International UK Ltd | Newcastle Under Lyme | A rating |
| Rag Traders London Ltd, t/a Rag & Bone | London | A rating |
| Raiffeisen Bank International AG | London | A rating |
| Railbookers UK Trading Ltd. | London | A rating |
| Raine Advisors Limited | London | A rating |
| Raisin Platforms Limited | Manchester | A rating |
| Raising Cane's Restaurants UK Limited | London | A rating |
| Rajapack Limited | Bedford | A rating |
| Rakuten Insight UK Limited | London | A rating |
| Rakuten Marketing Europe Limited | London | A rating |
| RAKUTEN SYMPHONY UK LTD | London | A rating |
| RAM Power UK Services LTD | Manchester | A rating |
| Ramboll UK Limited | London | A rating |
| Ramco Systems Limited | Leatherhead | A rating |
| Ramp Business UK Ltd | London | A rating |
| Ramsay Health Care UK | Bedford | A rating |
| Random House Group Ltd | London | A rating |
| Randox Laboratories Ltd. | Crumlin | A rating |
| Randstad UK Holding Ltd | Luton | A rating |
| Ranosys Technologies Ltd | Ashford | A rating |
| Ranplan Wireless Network Design | Cambridge | A rating |
| Rapha Racing Limited | London | A rating |
| RAPID7 INTERNATIONAL LIMITED | Reading | A rating |
| Rapiscan Systems Ltd | Salfords | A rating |
| Rare Limited | Twycross | A rating |
| RateGain Technologies Limited | London | A rating |
| Rational UK Limited | Luton | A rating |
| Rave Technologies (UK) Limited | Hemel Hempstead | A rating |
| Ravensburger Ltd | Bicester | A rating |
| Ravical LTD | London | A rating |
| Rawlinson & Hunter LLP | London | A rating |
| Raymarine UK Limited | Fareham | A rating |
| Raymond James Financial International Ltd | London | A rating |
| Raymond James Investment Services Limited | London | A rating |
| RaySpec Ltd | HIGH WYCOMBE | A rating |
| Raytheon Systems Limited | Harlow | A rating |
| RBB Economics LLP | London | A rating |
| RC Technology Limited | Croydon | A rating |
| RCI Bank UK Limited | Rickmansworth | A rating |
| RCI Europe | Kettering | A rating |
| RCI Financial Services Limited | Rickmansworth | A rating |
| RCL Investments Limited | Weybridge | A rating |
| Re-Leased Software Company UK Limited | London | A rating |
| Re-Tribe | London | A rating |
| Reach Subsea UK Limited | Aberdeen | A rating |
| Reachdesk Ltd | London | A rating |
| Real Software Systems, LLC | London | A rating |
| Real Transfer Limited | London | A rating |
| Realeyes Data Services Limited | London | A rating |
| Realforce Ltd | York | A rating |
| Realfoundations Ltd | London | A rating |
| Realterm Europe Management UK Ltd | London | A rating |
| Realty Income Limited | London | A rating |
| Reapit Ltd | London | A rating |
| Reask UK Limited | London | A rating |
| Reckitt Benckiser Group Plc | Slough | A rating |
| Recollective Ltd | London | A rating |
| Record plc | London | A rating |
| Recorded Future UK Limited | London | A rating |
| Recurly UK Limited | Manchester | A rating |
| Recursion London Ltd | London | A rating |
| Recyplas Limited | Wimblington | A rating |
| Red Bee Media Limited | Chiswick | A rating |
| RED BULL RACING LTD | MILTON KEYNES | A rating |
| Red Engineering Design Ltd | London | A rating |
| Red Gate Software Ltd | Cambridge | A rating |
| Red Hat UK Ltd | London | A rating |
| RED LIGHT MANAGEMENT LIMITED | London | A rating |
| Red Rock Renewables Limited | Edinburgh | A rating |
| Red Sands Services Limited | London | A rating |
| Red Ventures Limited | London | A rating |
| RedCloud Technologies Ltd | London | A rating |
| Reddit UK Ltd | London | A rating |
| Redflex Traffic Systems Ltd | Southampton | A rating |
| Redgert Comms Limited | London | A rating |
| Redis EMEA Ltd. | London | A rating |
| redk CRM Solutions Limited | Oxted | A rating |
| Redpanda Data EMEA Limited | Cheltenham | A rating |
| Redpath Deilmann UK Limited | Whitby | A rating |
| RedRidge Diligence Services Ltd | Castleford | A rating |
| RedSkyIT (Hemel) Limited | Hemel Hempstead | A rating |
| Reed Smith LLP | London | A rating |
| Reef Global Assets and Services (UK) Limited | London | A rating |
| Reef London Limited | London | A rating |
| REEL (UK) Limited | Stourbridge | A rating |
| Reference Data Services (UK) Ltd | Bristol | A rating |
| Reformation UK Limited | London | A rating |
| Refract Software Ltd | Newcastle Upon Tyne | A rating |
| Refresco Drinks UK Ltd | Kegworth | A rating |
| Regal Homes Management Limited | London | A rating |
| RegEdge Limited | London | A rating |
| Regeneron UK Limited | Uxbridge | A rating |
| Regnum Ltd | London | A rating |
| REHAU Ltd | Ross-on-Wye | A rating |
| Reinet Advisors (UK) Limited | London | A rating |
| Reiss Limited | London | A rating |
| Reka AI Ltd | London | A rating |
| Rekki Limited | London | A rating |
| Relation Therapeutics Limited | London | A rating |
| Relativity Global LLC | London | A rating |
| Relex Ltd | London | A rating |
| Reliance Global Energy Services Limited | London | A rating |
| Reliance Worldwide Corporation (UK) Limited | West Drayton | A rating |
| ReliaQuest UK Limited | London | A rating |
| RELX (UK) Limited | London | A rating |
| reMarkable Operations Ltd | London | A rating |