| SD Prestige & Performance Limited | | | tax violations | 2023 | UK-HMRC | £104,577 |
| Sculptur | | | tax violations | 2017 | UK-HMRC | £66,657 |
| Scrutton Bland LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £705 |
| Scream Wholesale Ltd | | | tax violations | 2019 | UK-HMRC | £87,911 |
| Scrap Safe Ltd | | | tax violations | 2017 | UK-HMRC | £132,481 |
| Scrap A Car Scotland | | | tax violations | 2018 | UK-HMRC | £49,774 |
| SCR Business Services Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Scotts Property LLP EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,532 |
| Scottish Equitable PLC | Aegon | financial services | investor protection violation | 2010 | UK-FSA | £2,800,000 |
| Scotland Electronics (International) Ltd | | | tax violations | 2018 | UK-HMRC | £96,662 |
| Scorpio Entertainment UK | | | tax violations | 2017 | UK-HMRC | £18,948 |
| Scorpigem International Ltd | | | tax violations | 2023 | UK-HMRC | £151,530 |
| Scarlett Fashion Ltd dba Glitz | | | tax violations | 2017 | UK-HMRC | £218,514 |
| Scafco Limited | | | tax violations | 2017 | UK-HMRC | £13,534 |
| SB Design Systems Ltd | | | tax violations | 2017 | UK-HMRC | £25,711 |
| Say Scaffolding Midlands Ltd | | | tax violations | 2020 | UK-HMRC | £40,956 |
| Saxons Lettings & Management Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Savoy Investment Management Limited | | | investor protection violation | 2012 | UK-FSA | £412,000 |
| Sati Ltd | | | tax violations | 2018 | UK-HMRC | £67,442 |
| Saray Restaurant (Doncaster) Limited | | | tax violations | 2023 | UK-HMRC | £32,704 |
| Santander UK plc | Banco Santander | financial services | banking violation | 2018 | UK-FCA | £32,817,800 |
| Santander UK plc | Banco Santander | financial services | investor protection violation | 2014 | UK-FCA | £12,377,800 |
| Santander UK plc | Banco Santander | financial services | investor protection violation | 2012 | UK-FSA | £1,500,000 |
| Santander UK plc | Banco Santander | financial services | banking violation | 2019 | UK-CMA | £19,000,000 |
| Santander UK plc | Banco Santander | financial services | banking violation | 2021 | UK-CMA | £0 |
| Santander UK Plc | Banco Santander | financial services | anti-money-laundering deficiencies | 2022 | UK-FCA | £107,793,300 |
| Sanne Fiduciary Services Limited | | | banking violation | 2019 | UK-JFSC | £381,010 |
| Sandwich Express (Liverpool) Ltd | | | tax violations | 2018 | UK-HMRC | £16,792 |
| Sandosmanagement Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,700 |
| Sandersons Property Services Ltd | | | tax violations | 2018 | UK-HMRC | £32,018 |
| San Giovanni Ltd dba Il Gusto | | | tax violations | 2022 | UK-HMRC | £31,663 |
| Sampson West | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £700 |
| Sambu Ltd | | | tax violations | 2021 | UK-HMRC | £59,251 |
| Sam Joinery | | | tax violations | 2023 | UK-HMRC | £27,399 |
| Salway and Wright (Spalding) Limited | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £1,050 |
| Salway & Wright Ltd | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £1,050 |
| Salut E Hind Limited dba Cook & Indi's World Buffet | | | tax violations | 2018 | UK-HMRC | £412,606 |
| Salt 'n' Pepper Restaurant (UK) Ltd | | | tax violations | 2018 | UK-HMRC | £52,959 |
| Saleem Bagh Limited | | | tax violations | 2019 | UK-HMRC | £26,940 |
| Sajaan Ltd dba Fab Kabab | | | tax violations | 2017 | UK-HMRC | £37,717 |
| Saihaj Ltd | | | tax violations | 2018 | UK-HMRC | £15,275 |
| SAI Prem Ltd dba Sanket News | | | tax violations | 2018 | UK-HMRC | £15,009 |
| Sagars Accountants Ltd | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £7,500 |
| Safs Burgers | | | tax violations | 2023 | UK-HMRC | £39,262 |
| Saffron Indian Restaurants Ltd | | | tax violations | 2017 | UK-HMRC | £41,698 |
| Saffron Indian Food Bar Limited | | | tax violations | 2022 | UK-HMRC | £10,159 |
| Safeloans Ltd. dba Paydayok | | | payday lending violation | 2010 | UK-OFT | £0 |
| Safehaven International Limited | | | anti-money-laundering deficiencies | 2020 | UK-GFSC | £100,000 |
| Sadias Enterprise Ltd dba Pink Garlic | | | tax violations | 2018 | UK-HMRC | £63,854 |
| Sadaf Charcoal Grill Ltd | | | tax violations | 2019 | UK-HMRC | £21,812 |
| Sachinexpress Limited dba Sachin Express | | | tax violations | 2019 | UK-HMRC | £27,024 |
| Sabirs Grill Bar Ltd | | | tax violations | 2018 | UK-HMRC | £18,286 |
| SA Kofte Ltd dba Sultanahmet Grill | | | tax violations | 2022 | UK-HMRC | £25,838 |
| S4B (UK) Ltd | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £1,000 |
| S.I News and Off Licence | | | tax violations | 2018 | UK-HMRC | £15,641 |
| S.H. Acc Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| S. C. Telfer | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £4,000 |
| S-Power Solutions Ltd | | | tax violations | 2018 | UK-HMRC | £27,199 |
| S&S Enterprises dba The Imporioum of Darkness and Light | | | tax violations | 2023 | UK-HMRC | £60,653 |
| S W Bars (UK) Limited dba TJ's Bar & Grill | | | tax violations | 2018 | UK-HMRC | £20,507 |
| S K Medical Practice Ltd | | | tax violations | 2017 | UK-HMRC | £73,372 |
| S and L Pearson Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,900 |
| S & Y Catering Limited dba Silver Hill | | | tax violations | 2022 | UK-HMRC | £29,004 |
| Ryebridge Limited | | | tax violations | 2014 | UK-HMRC | £33,481 |
| Ryan James Estate Agents Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £5,900 |
| Ryan Bailey Groundworks Ltd | | | tax violations | 2019 | UK-HMRC | £56,755 |
| Ryads Marrakech Cafe Limited | | | tax violations | 2020 | UK-HMRC | £65,318 |
| RW Invest North Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £44,210 |
| Rushbrooks Auctioneers And Valueers Ltd AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,100 |
| Ruro Ltd | | | tax violations | 2023 | UK-HMRC | £34,434 |
| Ruposhi Indian Restaurant Ltd | | | tax violations | 2018 | UK-HMRC | £11,688 |
| Rufford Stores | | | tax violations | 2017 | UK-HMRC | £14,787 |
| Rubix Real Estate Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,450 |
| RTS Textile Recyclers Limited | | | tax violations | 2018 | UK-HMRC | £89,866 |
| RTN Group Ltd | | | tax violations | 2022 | UK-HMRC | £67,771 |
| RT Incorporated Limited | | | tax violations | 2021 | UK-HMRC | £197,474 |
| RSM UK Audit LLP | RSM Group | business services | accounting fraud or deficiencies | 2019 | UK-ICAEW | £750,000 |
| RSM UK Audit LLP | RSM Group | business services | accounting fraud or deficiencies | 2020 | UK-ICAS | £104,300 |
| RSM UK Audit LLP | RSM Group | business services | accounting fraud or deficiencies | 2022 | UK-ICAS | £136,654 |
| 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 |
| RSA Associates | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £20,925 |
| 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 |
| RPG Crouch Chapman LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £1,439 |
| RP Estates London Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,460 |
| 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 |
