| Synergy Land Group Limited | | | investor protection violation | 2023 | UK-FCA | £27,000 |
| Symor Construction Limited | | | tax violations | 2018 | UK-HMRC | £37,308 |
| Sworders Agricultural Commercial and Residential Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,100 |
| Switch2day Limited dba Uswitch Business Telecommunications Limited | | | tax violations | 2017 | UK-HMRC | £18,672 |
| Swiftbooks09 | | | tax violations | 2017 | UK-HMRC | £42,205 |
| Swift Real Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,300 |
| Swift Insulation & Construction Ltd | | | tax violations | 2022 | UK-HMRC | £303,911 |
| Swift 1st Limited | | | mortgage abuses | 2011 | UK-FSA | £630,000 |
| Swastik Traders Ltd | | | tax violations | 2017 | UK-HMRC | £127,002 |
| Sutton McGrath Hartley Ltd | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £30,405 |
| Sutton McGrath Hartley Ltd | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £5,358 |
| Sushi Land Ltd. | | | tax violations | 2021 | UK-HMRC | £104,251 |
| Surrey Pubs And Inns Ltd | | | tax violations | 2017 | UK-HMRC | £167,838 |
| Surrey Homes Ltd (a company registered in the Isle Of Man) | | | tax violations | 2017 | UK-HMRC | £48,960 |
| Surrealty Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,460 |
| Surelet Hemel Hempstead Ltd | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| Sure Trading Limited | | | tax violations | 2019 | UK-HMRC | £227,234 |
| Superpower Payroll Limited | | | tax violations | 2016 | UK-HMRC | £1,457,539 |
| Suomen Puhallinteknikka OY | | | tax violations | 2021 | UK-HMRC | £33,285 |
| Sunshine Valet Ltd | | | tax violations | 2020 | UK-HMRC | £38,726 |
| Sunseeker London Ltd | | | tax violations | 2018 | UK-HMRC | £19,851 |
| Sunrise Brokers LLP | BGC Partners | financial services | anti-money-laundering deficiencies | 2021 | UK-FCA | £642,400 |
| Sunripe Exotic Ltd | | | tax violations | 2017 | UK-HMRC | £27,169 |
| Sunny Take Away | | | tax violations | 2022 | UK-HMRC | £186,244 |
| Sunny Bay Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| Sunnerd Ltd | | | tax violations | 2018 | UK-HMRC | £118,115 |
| Sund Delivery Limited dba TGF Pizza | | | tax violations | 2016 | UK-HMRC | £118,369 |
| Sunargow Restaurant Ltd | | | tax violations | 2019 | UK-HMRC | £208,774 |
| Sun Life Assurance Company of Canada (UK) Limited | Sun Life Financial | financial services | investor protection violation | 2012 | UK-FSA | £600,000 |
| Sumo Products | | | tax violations | 2016 | UK-HMRC | £133,309 |
| Sumhas Cars Ltd | | | tax violations | 2022 | UK-HMRC | £28,059 |
| Sumer 62 Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £0 |
| Sugjarern Limited dba Tong Thai Restaurant | | | tax violations | 2020 | UK-HMRC | £16,334 |
| Sue Bridges Lettings Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,500 |
| Styles & Co JFC Limited | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £700 |
| Styleblue Ltd dba The Baked Potato Shop | | | tax violations | 2018 | UK-HMRC | £56,898 |
| Stratstone Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,100 |
| Stratos Property Development and Investment Consultants EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| STR Trucksales Ltd | | | tax violations | 2017 | UK-HMRC | £43,688 |
| Stormcheck Roofing Systems Limited | | | tax violations | 2019 | UK-HMRC | £23,535 |
| Stopfords (Chesterfield) LLP | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £3,805 |
| Stewarts Accountants Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £1,400 |
| Stewart & Partners | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £6,000 |
| Sterte Print Limited | | | tax violations | 2019 | UK-HMRC | £18,721 |
| Sterling Property Consultants Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £5,950 |
| Sterling Management Contract Services Ltd | | | tax violations | 2022 | UK-HMRC | £66,580 |
| Sterling First Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,150 |
| Stericile Ltd | | | tax violations | 2021 | UK-HMRC | £66,941 |
| Stella Mares Ltd dba Barraco | | | tax violations | 2018 | UK-HMRC | £78,004 |
| Stefplast Ltd | | | tax violations | 2018 | UK-HMRC | £57,368 |
| Stationers Depot | | | tax violations | 2017 | UK-HMRC | £21,785 |
| State Street Bank Europe Limited and State Street Global Markets International Limited | State Street Corp. | financial services | investor protection violation | 2014 | UK-FCA | £22,885,000 |
| Standard Life Assurance Limited | Phoenix Group Holdings PLC | financial services | investor protection violation | 2019 | UK-FCA | £30,792,500 |
| Standard Life Assurance Limited | Phoenix Group Holdings PLC | financial services | investor protection violation | 2010 | UK-FSA | £2,450,000 |
| Standard Chartered Trust (Guernsey) Limited | | | anti-money-laundering deficiencies | 2020 | UK-GFSC | £140,000 |
| Standard Chartered Bank | Standard Chartered | financial services | anti-money-laundering deficiencies | 2019 | UK-FCA | £102,163,200 |
| Standard Chartered Bank | Standard Chartered | financial services | economic sanction violation | 2020 | UK-OFSI | £20,471,810 |
| Standard Chartered Bank | Standard Chartered | financial services | internal controls deficiency | 2021 | UK-PRA | £46,550,000 |
| Standard Bank PLC | Standard Bank Group Limited | financial services | anti-money-laundering deficiencies | 2014 | UK-FCA | £7,640,400 |
| Standard Bank Isle of Man Limited | | | anti-money-laundering deficiencies | 2022 | UK-IOM | £247,324 |
| Stalwart Trading Ltd | | | tax violations | 2021 | UK-HMRC | £163,995 |
| Stadium Investments | | | tax violations | 2020 | UK-HMRC | £48,169 |
| Stacey Mann Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £26,400 |
| Stacey Mann Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £26,400 |
| ST Takeaway Ltd dba Marmaris Kebab House | | | tax violations | 2019 | UK-HMRC | £115,721 |
| St John's Innovation Centre Ltd TCSP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £15,000 |
| St Ermins Operating (UK) Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £0 |
| St Cyprian's Student Halls Limited | | | tax violations | 2019 | UK-HMRC | £20,636 |
| SSD Trading Limited | | | tax violations | 2017 | UK-HMRC | £383,594 |
| SS Traders Ltd | | | tax violations | 2019 | UK-HMRC | £643,103 |
| SS Leisure Limited | | | tax violations | 2016 | UK-HMRC | £19,228 |
| SS Euro Distribution | | | tax violations | 2021 | UK-HMRC | £13,322 |
| SRS (Sheffield) Limited | | | tax violations | 2016 | UK-HMRC | £518,734 |
| SRLV Audit Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £20,260 |
| Sree Sai NI Ltd | | | tax violations | 2017 | UK-HMRC | £20,627 |
| Squarebrook Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £5,000 |
| SPW (UK) LLP | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £4,658 |
| Springroll Chen Limited dba Spring Roll Takeaway | | | tax violations | 2020 | UK-HMRC | £33,288 |
| Springfield Quay Ltd dba Ashoka at the Quay | | | tax violations | 2018 | UK-HMRC | £55,253 |
| Springers (Great Barr) Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,100 |
| Springer Homes Thanet Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,950 |
| Springburn Stores Ltd | | | tax violations | 2018 | UK-HMRC | £141,739 |
| Splash Hot Hand Car Wash and Eurasia Market | | | tax violations | 2017 | UK-HMRC | £44,005 |
| Spice Touch Ltd dba Brecks | | | tax violations | 2019 | UK-HMRC | £22,572 |
| Spice of Life (EKCW) Ltd | | | tax violations | 2020 | UK-HMRC | £27,637 |
| Spice Brasserie (Trimdon) Ltd | | | tax violations | 2018 | UK-HMRC | £23,619 |
| Spice Aroma | | | tax violations | 2018 | UK-HMRC | £21,513 |
| Sperrin Restaurant | | | tax violations | 2018 | UK-HMRC | £19,892 |
| Spencer Jakeman Property Management Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,500 |
| Spectrum Contracting Services Ltd | | | tax violations | 2018 | UK-HMRC | £1,408,429 |
| Specmar Ltd dba Morrell Offshore Services Ltd. | | | tax violations | 2017 | UK-HMRC | £27,772 |
| Specialist Solutions plc | | | investor protection violation | 2011 | UK-FSA | £35,000 |
| Specialist Computer Services Limited | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £0 |
| Specialist Cars of Malton Limited | | | tax violations | 2021 | UK-HMRC | £112,432 |
| Speakman & Parmar Limited AMP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £12,500 |
| Spartan Midlands Limited | | | tax violations | 2017 | UK-HMRC | £183,001 |
| Spar West Cross Ltd franchise of Spar | | | tax violations | 2017 | UK-HMRC | £14,472 |
| Spain Brothers & Co | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £2,000 |
| Sowerby FRS LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £2,100 |
| Southwell, Tyrrell & Co | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £6,315 |
| Southern Construction Group Ltd | | | tax violations | 2023 | UK-HMRC | £13,719 |
