| RSM Tenon Financial Services Limited | RSM Group | business services | investor protection violation | 2010 | UK-FSA | £700,000 |
| RSM Robson Rhodes LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2011 | UK-FRC | £975,000 |
| RPG Crouch Chapman LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £42,343 |
| RPG Crouch Chapman LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £1,019 |
| Roz Sumari Ltd dba Brentford Tandoori | | | tax violations | 2023 | UK-HMRC | £18,045 |
| Royl Shopfronts & Shutters Ltd | | | tax violations | 2018 | UK-HMRC | £66,183 |
| Royal Bank of Scotland Plc, National Westminster Bank Plc and Ulster Bank Ltd. | NatWest Group PLC | financial services | internal controls deficiency | 2014 | UK-PRA | £14,000,000 |
| Royal Bank of Scotland Plc and National Westminster Bank Plc and Ulster Bank Plc | NatWest Group PLC | financial services | banking violation | 2014 | UK-FCA | £42,000,000 |
| Royal Bank of Scotland Group | NatWest Group PLC | financial services | banking violation | 2020 | UK-CMA | £2,200,000 |
| Rowland Co | | | tax violations | 2020 | UK-HMRC | £29,939 |
| Rowan Dartington & Co Limited | St. James's Place PLC | financial services | investor protection violation | 2010 | UK-FSA | £511,000 |
| Rotherham Taylor Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £1,400 |
| Rotherham Holistic & Beauty and Swiftfit Satelites | | | tax violations | 2017 | UK-HMRC | £40,551 |
| Rostance Edwards (Staffs) Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,043 |
| Rosso Woodford Ltd | | | tax violations | 2017 | UK-HMRC | £53,657 |
| Ross & Company | | | accounting fraud or deficiencies | 2018 | UK-ICAS | £3,450 |
| Rosebond Ltd | | | tax violations | 2017 | UK-HMRC | £13,744 |
| Rose Orchard Chinese Restaurant | | | tax violations | 2017 | UK-HMRC | £48,258 |
| Rose & Crown (The) | | | tax violations | 2017 | UK-HMRC | £49,838 |
| Roosters Chinese Takeaway | | | tax violations | 2019 | UK-HMRC | £44,041 |
| Romeo Pizza Ltd | | | tax violations | 2022 | UK-HMRC | £55,411 |
| Roman James Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £24,780 |
| Roma Mini Market Ltd | | | tax violations | 2019 | UK-HMRC | £135,294 |
| Rollmast Ltd | | | tax violations | 2016 | UK-HMRC | £19,557 |
| Rocks Haulage Ltd | | | tax violations | 2019 | UK-HMRC | £24,729 |
| Rockingham Independent Limited | | | investor protection violation | 2011 | UK-FSA | £35,000 |
| Rocketek Inc dba Rocketek UK | | | tax violations | 2019 | UK-HMRC | £48,531 |
| Rocket Joe's Pizza | | | tax violations | 2019 | UK-HMRC | £142,079 |
| Rockers Guitars Limited HVD | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £13,000 |
| Rock Projects Ltd | | | tax violations | 2016 | UK-HMRC | £96,900 |
| Rocco Fashion Limited | | | tax violations | 2019 | UK-HMRC | £109,231 |
| Rocca Bars Limited dba Rocca Bar | | | tax violations | 2018 | UK-HMRC | £21,871 |
| Robin Moss Accountants Limited | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| Robin Bradford (Life and Pension Consultants) Ltd | | | investor protection violation | 2010 | UK-FSA | £24,500 |
| Robertson Milroy Limited | | | accounting fraud or deficiencies | 2015 | UK-ICAEW | £14,380 |
| Roberts & Co | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £30,125 |
| Robert Pinkus & Co LLP EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £11,895 |
| Robert Holmes & Company (Coombe) Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £6,591 |
| Robert Evans | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £0 |
| Road Runner Trans Ltd | | | tax violations | 2023 | UK-HMRC | £87,235 |
| RMR Partnership LLP | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £350 |
| Riverside Tenpin Bowling Ltd | | | tax violations | 2021 | UK-HMRC | £127,396 |
| River and Mercantile Asset Management LLP | | | insider trading | 2019 | UK-FCA | £108,600 |
| Rivaprint Limited | | | tax violations | 2022 | UK-HMRC | £37,293 |
| Ritchie Building Ltd | | | tax violations | 2017 | UK-HMRC | £39,724 |
| Rishworth Baxter Limited | | | anti-money-laundering deficiencies | 2018 | UK-HMRC | £3,245 |
| Rishton Mini Market Limited | | | tax violations | 2018 | UK-HMRC | £27,913 |
| Risbury Building Developments Ltd | | | tax violations | 2021 | UK-HMRC | £123,266 |
| Ripe LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £5,488 |
| Rio Tinto plc | Rio Tinto | mining and minerals | accounting fraud or deficiencies | 2017 | UK-FCA | £27,385,400 |
| Ringmoor Group Limited | | | tax violations | 2022 | UK-HMRC | £20,236 |
| RIM Scaffolding (Leeds) Ltd | | | tax violations | 2022 | UK-HMRC | £37,375 |
| Riley & Co Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £12,048 |
| Rijaem Cleaner Ltd | | | tax violations | 2023 | UK-HMRC | £45,863 |
| Rigcharm Limited | | | tax violations | 2022 | UK-HMRC | £202,760 |
| Ridgefield Consulting Ltd | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,000 |
| Ridgefield Consulting Ltd | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £0 |
| Ridge Valley Roofing | | | tax violations | 2015 | UK-HMRC | £11,530 |
| Ridehalgh Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £3,300 |
| Richmond Fiduciary Group Limited | | | anti-money-laundering deficiencies | 2018 | UK-GFSC | £45,500 |
| Richardson Accountancy Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,164 |
| Richardson Accountancy Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,164 |
| Richard Marchant Limited HVD | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| Rich and Famous Limited franchise of Papa Johns | | | tax violations | 2016 | UK-HMRC | £357,464 |
| Rhythm and Booze | | | tax violations | 2019 | UK-HMRC | £43,105 |
| Rhema Solutions Ltd | | | tax violations | 2016 | UK-HMRC | £16,414 |
| RG Trading Surrey Limited dba Tandoori Nights | | | tax violations | 2020 | UK-HMRC | £29,738 |
| RG Contractor Ltd | | | tax violations | 2017 | UK-HMRC | £42,114 |
| Rev-Solutions | | | tax violations | 2018 | UK-HMRC | £108,252 |
| Retail Court Ltd | | | tax violations | 2020 | UK-HMRC | £82,974 |
| Restaurant 25 Limited | | | tax violations | 2019 | UK-HMRC | £46,212 |
| RES Global Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,800 |
| Rent Assured Property Services Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £13,729 |
| Renovating 4 U Ltd | | | tax violations | 2022 | UK-HMRC | £24,399 |
| Relief Secure Services Ltd | | | tax violations | 2022 | UK-HMRC | £129,870 |
| Relatus Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,000 |
| Rehoboth Property International Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,000 |
| Regency Payroll Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £13,700 |
| Regal Garage Services Ltd dba Ingleside Garage | | | tax violations | 2018 | UK-HMRC | £44,272 |
| Refac Ltd. | | | tax violations | 2015 | UK-HMRC | £12,986 |
| Redstone Mortgages Limited | | | mortgage abuses | 2010 | UK-FSA | £630,000 |
| Redland Services Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,703 |
| Redcastle Lettings Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,650 |
| Red Trading (UK) Ltd dba Redfiz Ltd. | | | tax violations | 2017 | UK-HMRC | £890,261 |
| Red Sun | | | tax violations | 2023 | UK-HMRC | £96,192 |
| Red Retro Wines Ltd | | | tax violations | 2016 | UK-HMRC | £34,435 |
| Red Rag Group Limited (AMP) AMP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,500 |
| Red Jon Ltd | | | tax violations | 2022 | UK-HMRC | £739,931 |
| Red Gurkha Ltd dba Annapurna | | | tax violations | 2019 | UK-HMRC | £22,954 |
| Reckitt Benckiser Group Plc | Reckitt Benckiser | household and personal care products | investor protection violation | 2015 | UK-FCA | £539,800 |
| Rebos Investments Ltd | | | tax violations | 2022 | UK-HMRC | £258,105 |
| Rebase Group Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £7,850 |
| Real Itaste Limited | | | tax violations | 2021 | UK-HMRC | £42,653 |
| Real India Ltd | | | tax violations | 2018 | UK-HMRC | £16,894 |
| Real & Dream Bookkeeping Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,300 |
| RDP Newmans LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £3,580 |
| RCG10 Limited | | | tax violations | 2019 | UK-HMRC | £13,957 |
| Raymat Quilts & Textiles (UK) Ltd | | | tax violations | 2016 | UK-HMRC | £35,112 |
| Raybould & Bines Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,558 |
| Rawlinsons | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £7,242 |
| Ravals Luxury Indian Restaurant | | | tax violations | 2020 | UK-HMRC | £48,218 |
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