| Prismaflex UK LtdCanterbury, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| Prodigy Holdings LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Progressive Luxury Publishing LimitedHull, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2010 |
| Promotions Trade Company LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Provenance-Wine LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2021 |
| Puma Fire Products LimitedAndover, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1996 |
| Pure Cloud Solutions LtdTamworth, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Purple Public Relations LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1997 |
| Quartz Business Media LtdRedhill, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2009 |
| R & B Wines LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1999 |
| R & M Electrical Group LtdHampshire, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1988 |
| R S Foods LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| R. Weil Distribution UK LtdManchester, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2013 |
| Rapiscan Systems LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1992 |
| Raporto LimitedBournemouth, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2021 |
| Rarewine UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Rarter LtdBrighouse, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1978 |
| Rawlings & Son LtdBristol, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1937 |
| Rayner Intraocular Lenses LimitedWorthing, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1958 |
| Rebecca Udall LimitedMalton, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2018 |
| Red Bull Racing LimitedTilbrook, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1995 |
| Red Dot Wine Company LtdNeston, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Redfold Vineyards LLPBeaconsfield, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2010 |
| Regency Hampers LimitedPershore, United Kingdom · UKregencyhampers.com · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| Regency Wines LimitedExeter Devon, United Kingdom · UKregencywines.co.uk · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2003 |
| Renaissance Capital LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1995 |
| Reuters News & Media LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1990 |
| Rhi Transport LtdNorthwich, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2018 |
| Rhino Wines LtdCoventry, United Kingdom · UKrhinowines.co.uk · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2024 |
| Rhone Group LLPLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2006 |
| Rhytik Leisure LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Richmond Street Productions UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2022 |
| Riello Ups LtdWrexham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2002 |
| Right Formula LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2009 |
| Riley Scooters LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2020 |
| Riva South LimitedEastleigh, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1989 |
| Rivage Vin LimitedRugby, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2026 |
| Road and Race Automotive LtdDereham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2019 |
| Rocca Mora LtdUnited Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2009 |
| Rochem Fyrewash LtdWinchester, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1983 |
| Rocket Food LtdBirmingham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2000 |
| Rok Drinks LimitedAlbrighton, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Roland Dg LtdBristol, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| Ronly Group LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2007 |
| Rothenberger LtdKettering, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1971 |
| Royal Mail Group LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| Royle Forest Weddings LimitedBurton-on-Trent, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2019 |
| Rsi.sw LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2021 |
| Rubelli LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1957 |
| Rubicer Scotland LimitedFraserburgh, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2013 |