| 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 |
| Saray Restaurant (Doncaster) Limited | | | tax violations | 2023 | UK-HMRC | £32,704 |
| Sati Ltd | | | tax violations | 2018 | UK-HMRC | £67,442 |
| Savoy Investment Management Limited | | | investor protection violation | 2012 | UK-FSA | £412,000 |
| Saxons Lettings & Management Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Say Scaffolding Midlands Ltd | | | tax violations | 2020 | UK-HMRC | £40,956 |
| SB Design Systems Ltd | | | tax violations | 2017 | UK-HMRC | £25,711 |
| SB Roofing | | | tax violations | 2024 | UK-HMRC | £38,773 |
| SC Land And New Homes Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £27,400 |
| Scafco Limited | | | tax violations | 2017 | UK-HMRC | £13,534 |
| Scarlett Fashion Ltd dba Glitz | | | tax violations | 2017 | UK-HMRC | £218,514 |
| Scorpigem International Ltd | | | tax violations | 2023 | UK-HMRC | £151,530 |
| Scorpio Entertainment UK | | | tax violations | 2017 | UK-HMRC | £18,948 |
| Scotland Electronics (International) Ltd | | | tax violations | 2018 | UK-HMRC | £96,662 |
| Scottish Equitable PLC | Aegon | financial services | investor protection violation | 2010 | UK-FSA | £2,800,000 |
| Scotts Property LLP EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,532 |
| SCR Business Services Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Scrap A Car Scotland | | | tax violations | 2018 | UK-HMRC | £49,774 |
| Scrap Safe Ltd | | | tax violations | 2017 | UK-HMRC | £132,481 |
| Scream Wholesale Ltd | | | tax violations | 2019 | UK-HMRC | £87,911 |
| Scrutton Bland LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £705 |
| Scuderia Prestige Automobile Ltd HVD | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,250 |
| Sculptur | | | tax violations | 2017 | UK-HMRC | £66,657 |
| SD Prestige & Performance Limited | | | tax violations | 2023 | UK-HMRC | £104,577 |
| SDC (2012) Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £19,005 |
| SDLT Experts Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,000 |
| Sea Breeze | | | tax violations | 2022 | UK-HMRC | £52,675 |
| Sea Smile Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,500 |
| Sean Heaney Homes and Property Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,400 |
| Seaside Pub Company Ltd dba The Royal Albion | | | tax violations | 2022 | UK-HMRC | £53,460 |
| Secure Facilities Ltd | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| Security Management Services Limited | | | tax violations | 2018 | UK-HMRC | £63,726 |
| Sedulo Audit Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £696 |
| Seeart Gallery Ltd AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,250 |
| Sehar Holdings Ltd | | | tax violations | 2014 | UK-HMRC | £25,678 |
| SEI Investments (Europe) Limited | | | investor protection violation | 2013 | UK-FCA | £900,200 |
| Sein Gellen Ltd | | | tax violations | 2019 | UK-HMRC | £23,348 |
| Selby Holdings Limited | | | tax violations | 2023 | UK-HMRC | £33,590 |
| Selplas Ltd | | | tax violations | 2022 | UK-HMRC | £23,161 |
| Serco Geografix Ltd | Serco Group | miscellaneous services | fraud | 2019 | UK-SFO | £91,400,000 |
| Services A-Z Ltd | | | tax violations | 2022 | UK-HMRC | £316,602 |
| Sesame Limited | Aviva PLC | financial services | investor protection violation | 2014 | UK-FCA | £1,598,000 |
| Sesame Limited | Aviva PLC | financial services | investor protection violation | 2013 | UK-FCA | £6,031,200 |
| Sett Valley Insurance Services | | | investor protection violation | 2010 | UK-FSA | £28,000 |
| Seventeen Gallery LLP AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,200 |
| SFS (Oldham) Limited | | | tax violations | 2016 | UK-HMRC | £25,194 |
| SFYK Ltd | | | tax violations | 2017 | UK-HMRC | £97,324 |
| SG Euro Trades Ltd | | | tax violations | 2021 | UK-HMRC | £503,612 |
| SGI Builder Limited | | | tax violations | 2023 | UK-HMRC | £52,110 |
| Shaanz Peri Peri Bridgwater Ltd | | | tax violations | 2023 | UK-HMRC | £41,426 |
| Shabaaz Curry Cottage Limited dba Thai Elephant | | | tax violations | 2018 | UK-HMRC | £36,566 |
| Shacter Cohen & Bor LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £17,551 |
| Shah Jalal Belfast Ltd | | | tax violations | 2018 | UK-HMRC | £15,277 |
| Shahi Raj Restaurant Ltd dba Shahi Raj Restaurant and Takeaway | | | tax violations | 2018 | UK-HMRC | £37,757 |
| Shahpron Limited dba Baburchi Cuisine | | | tax violations | 2019 | UK-HMRC | £36,027 |
| Shakun Subway Ltd franchise of Subway | | | tax violations | 2017 | UK-HMRC | £29,251 |
| Shampan of Cardigan Ltd | | | tax violations | 2019 | UK-HMRC | £25,229 |
| Sharcc Limited formerly trading as The Hen House | | | tax violations | 2023 | UK-HMRC | £26,243 |
| Shark 4 U | | | tax violations | 2020 | UK-HMRC | £54,332 |
| Sharman Fielding | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £2,935 |
| Sharman Fielding | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £17,912 |
| Sharmin Restaurants Limited dba L'Oud Des Eurasie | | | tax violations | 2019 | UK-HMRC | £51,539 |
| Shat Limited fka Fresh Almalaky | | | tax violations | 2022 | UK-HMRC | £25,568 |
| Shawty Trading Ltd | | | tax violations | 2019 | UK-HMRC | £304,184 |
| Sheena Knitwear (M/CR) Limited | | | tax violations | 2015 | UK-HMRC | £20,572 |
| Sheepridge Off Licence Limited dba Best One Xpress | | | tax violations | 2018 | UK-HMRC | £19,481 |
| Shelby Finance Limited | | | payday lending violation | 2020 | UK-CMA | £527,863 |
| Shelley Mumith & Co Limited ASP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,420 |
| Shen Zhen Shi Bedi Shangmao You Xian Going S.I. dba CHanning56789 | | | tax violations | 2018 | UK-HMRC | £220,560 |
| Shen Zhen Shi Chuang jiahui Dian Zi Shang Wuyou Xian Gong Si | | | tax violations | 2019 | UK-HMRC | £22,108 |
| Shen Zhen Shi Hui Tang Ke Ji You Xian Gong Si dba buyftb | | | tax violations | 2018 | UK-HMRC | £54,375 |
| Shen Zhen Shi Shang Huang Shang Mao Company Limited dba Seeblue | | | tax violations | 2018 | UK-HMRC | £82,604 |
| Shen Zhen Si Mai Si Dian Zi Shang Wu You Xian Gong Si | | | tax violations | 2018 | UK-HMRC | £55,172 |
| Shenxhen Kumeida Technology Co Ltd dba Eonfinedirect UK | | | tax violations | 2018 | UK-HMRC | £49,397 |
| Shenzhen Aosihhui Technology Co. Ltd dba Aosihui UK | | | tax violations | 2018 | UK-HMRC | £48,618 |
| Shenzhen Qiao Zhuo E-Commerce Ltd | | | tax violations | 2019 | UK-HMRC | £1,411,508 |
| Shenzhen Qingaimin Consulting Ltd Company | | | tax violations | 2018 | UK-HMRC | £146,056 |
| Shenzhen Shi Chenghaoming Kejiyouxiangongsi | | | tax violations | 2019 | UK-HMRC | £95,900 |
| Shenzhen Tuoting Technology Co Ltd dba MicroYep UK | | | tax violations | 2021 | UK-HMRC | £381,501 |
| Shenzhen Youke Shangmao Co. Ltd | | | tax violations | 2019 | UK-HMRC | £143,339 |
| Shenzhen Yuanbei Technologies Co. Ltd | | | tax violations | 2019 | UK-HMRC | £259,497 |
| Shenzhen Zhuoer Photography Equipment Co Ltd dba Dcmall | | | tax violations | 2019 | UK-HMRC | £142,303 |
| Shenzhenishi Longhanfengyi Kejyouxiangongsi dba ZookkiDirectUK | | | tax violations | 2018 | UK-HMRC | £364,618 |
| Shenzhenshi Dongfang Sanrenxing Shiye Youxian Gongsi dba Gainwell UK | | | tax violations | 2018 | UK-HMRC | £25,636 |
| Shenzhenshi Youpicnchuang Shanmao Co Ltd | | | tax violations | 2018 | UK-HMRC | £17,604 |
| Shenzhenshi Yueyiyinshuayouxiangongsi dba Yueying | | | tax violations | 2020 | UK-HMRC | £279,484 |
| Shenzhenshihuahancaizhizhipin Baozhuangyouxiangongsi | | | tax violations | 2018 | UK-HMRC | £81,484 |
| Shenzhenshizengtuodianzi Shangwuyouxiangongsi | | | tax violations | 2020 | UK-HMRC | £85,048 |
| Sheppard & Co Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £2,495 |
| Sheridans Ltd | | | anti-money-laundering deficiencies | 2018 | UK-HMRC | £3,553 |
| Sherwood Fish & Kebab House | | | tax violations | 2017 | UK-HMRC | £14,588 |
| Sherzi Exchange Limited MSB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £270,530 |
| Shift Financial Services Limited MSB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £15,350 |
| Shiny Bikes Ltd | | | tax violations | 2017 | UK-HMRC | £142,038 |
| Shipleys LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £13,193 |
| Shipleys LLP | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £16,030 |
| Shipshape Restaurants Ltd | | | tax violations | 2018 | UK-HMRC | £17,114 |
| Shisha House Ltd | | | tax violations | 2017 | UK-HMRC | £52,378 |
| Shop it Again | | | tax violations | 2018 | UK-HMRC | £169,887 |
| Shoponix Ltd | | | tax violations | 2022 | UK-HMRC | £180,101 |
