| Nationwide Building Society | Nationwide Building Society | financial services | banking violation | 2019 | UK-CMA | £6,000,000 |
| Credit Suisse (UK) Limited | UBS | financial services | investor protection violation | 2011 | UK-FSA | £5,950,000 |
| Ghana International Bank Plc | | | anti-money-laundering deficiencies | 2022 | UK-FCA | £5,829,900 |
| CMS Metals Ltd | | | tax violations | 2017 | UK-HMRC | £5,774,265 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2023 | UK-FRC | £5,625,000 |
| The Royal Bank of Scotland plc and The Royal Bank of Scotland N.V. | NatWest Group PLC | financial services | investor protection violation | 2013 | UK-FCA | £5,620,300 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2017 | UK-FRC | £5,600,000 |
| The Royal Bank of Scotland plc et al. | NatWest Group PLC | financial services | anti-money-laundering deficiencies | 2010 | UK-FSA | £5,600,000 |
| Metro Bank plc | Metro Bank PLC | financial services | internal controls deficiency | 2021 | UK-PRA | £5,376,000 |
| I Hami Creative Company Limited | | | tax violations | 2018 | UK-HMRC | £5,219,425 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2024 | UK-FRC | £5,173,730 |
| Mineworld Limited | | | investor protection violation | 2015 | UK-FCA | £5,000,000 |
| PwC LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2017 | UK-FRC | £5,000,000 |
| BGC Brokers LP and GFI Brokers Ltd and GFI Securities Ltd | | | investor protection violation | 2022 | UK-FCA | £4,775,200 |
| Deutsche Bank AG | Deutsche Bank | financial services | investor protection violation | 2014 | UK-FCA | £4,718,800 |
| Premier Metals (Leeds) Ltd | | | tax violations | 2017 | UK-HMRC | £4,685,825 |
| Universal Project Services Ltd | | | tax violations | 2018 | UK-HMRC | £4,651,334 |
| Asia Resource Minerals plc fka Bumi plc | | | investor protection violation | 2015 | UK-FCA | £4,651,200 |
| Ernst & Young LLP | Ernst & Young | business services | accounting fraud or deficiencies | 2024 | UK-FRC | £4,649,639 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2019 | UK-FRC | £4,550,000 |
| Deloitte LLP | Deloitte | business services | accounting fraud or deficiencies | 2019 | UK-FRC | £4,525,000 |
| KPMG Audit Plc | KPMG | business services | accounting fraud or deficiencies | 2019 | UK-FRC | £4,500,000 |
| Skelwith Leisure (Raithwaite) Ltd | | | tax violations | 2017 | UK-HMRC | £4,493,791 |
| Genius Pro Contract Services Ltd fka SMP Contract Services Ltd | | | tax violations | 2024 | UK-HMRC | £4,372,303 |
| Business Networks Management Ltd dba Zambezi Business Mangement Ltd | | | tax violations | 2018 | UK-HMRC | £4,351,395 |
| Carlton Buildings | | | tax violations | 2023 | UK-HMRC | £4,225,950 |
| EFG Private Bank Ltd | | | anti-money-laundering deficiencies | 2013 | UK-FSA | £4,200,000 |
| Winterflood Securities Limited | Close Brothers Group PLC | financial services | investor protection violation | 2010 | UK-FSA | £4,052,500 |
| Al Rayan Bank PLC | | | anti-money-laundering deficiencies | 2023 | UK-FCA | £4,023,600 |
| Forex Capital Markets Ltd and FXCM Securities Ltd | | | investor protection violation | 2014 | UK-FCA | £4,000,000 |
| The Nameless Ltd | | | tax violations | 2024 | UK-HMRC | £3,782,295 |
| Jedirect Corp | | | tax violations | 2021 | UK-HMRC | £3,740,541 |
| Greenlight Capital Inc. | | | insider trading | 2012 | UK-FSA | £3,650,795 |
| 13168375 Ltd fka MIT Benefits 2 Ltd | | | tax violations | 2024 | UK-HMRC | £3,632,248 |
| CB Payments Limited | | | anti-money-laundering deficiencies | 2024 | UK-FCA | £3,503,546 |
| KPMG Audit Plc | KPMG | business services | accounting fraud or deficiencies | 2019 | UK-FRC | £3,500,000 |
| Martin Currie Investment Management Limited and Martin Currie Inc | | | investor protection violation | 2012 | UK-FSA | £3,500,000 |
| Integrated Financial Arrangements plc | IntegraFin Holdings PLC | financial services | investor protection violation | 2011 | UK-FSA | £3,500,000 |
| Bank of Scotland Plc | Lloyds Banking Group | financial services | investor protection violation | 2011 | UK-FSA | £3,500,000 |
| Fowler Oldfield Ltd | | | tax violations | 2017 | UK-HMRC | £3,488,081 |
| Ezy Drinks Ltd | | | tax violations | 2017 | UK-HMRC | £3,482,016 |
| TFS-ICAP Ltd. | | | investor protection violation | 2020 | UK-FCA | £3,444,100 |
| KPMG | KPMG | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £3,375,000 |
| JBK Constructions Ltd | | | tax violations | 2024 | UK-HMRC | £3,319,617 |
| KPMG LLP | KPMG | business services | accounting fraud or deficiencies | 2018 | UK-FRC | £3,296,000 |
| Sonali Bank (UK) Limited | | | anti-money-laundering deficiencies | 2016 | UK-FCA | £3,250,600 |
| Grant Thornton UK LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2018 | UK-FRC | £3,165,000 |
| J.P. Morgan International Bank Limited | JPMorgan Chase | financial services | investor protection violation | 2013 | UK-FCA | £3,076,200 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2016 | UK-FRC | £3,050,000 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £3,038,750 |
| KPMG LLP | KPMG | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £3,010,000 |
| Deloitte & Touche | Deloitte | business services | accounting fraud or deficiencies | 2015 | UK-FRC | £3,000,000 |
| Simply Plant Sales Limited fka Slater Haringthwaite Limited | | | tax violations | 2024 | UK-HMRC | £2,959,474 |
| Millburn Insurance Company Limited | | | internal controls deficiency | 2016 | UK-PRA | £2,863,066 |
| Premier Waste & Recycling Ltd | | | tax violations | 2014 | UK-HMRC | £2,806,526 |
| Scottish Equitable PLC | Aegon | financial services | investor protection violation | 2010 | UK-FSA | £2,800,000 |
| MY.KLT Ltd | | | tax violations | 2018 | UK-HMRC | £2,713,705 |
| East Sussex Distribution Ltd | | | tax violations | 2016 | UK-HMRC | £2,654,014 |
| Ekey Technology Ltd | | | tax violations | 2018 | UK-HMRC | £2,645,065 |
| Kumbhayana Productions Limited. fka Film TMK Limited. | | | tax violations | 2023 | UK-HMRC | £2,546,508 |
| Grant Thornton UK LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2017 | UK-FRC | £2,475,000 |
| Bastion Capital London Limited | | | anti-money-laundering deficiencies | 2023 | UK-FCA | £2,452,700 |
| Standard Life Assurance Limited | Phoenix Group Holdings PLC | financial services | investor protection violation | 2010 | UK-FSA | £2,450,000 |
| KPMG Audit Plc | KPMG | business services | accounting fraud or deficiencies | 2023 | UK-FRC | £2,450,000 |
| Lamprell plc | | | investor protection violation | 2013 | UK-FSA | £2,428,300 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £2,415,000 |
| Credit Suisse International | UBS | financial services | investor protection violation | 2014 | UK-FCA | £2,398,100 |
| Amber Motor Company Ltd. Previously known as EJH2 Ltd | | | tax violations | 2020 | UK-HMRC | £2,396,285 |
| Pembrokeshire Mortgage Centre Limited | | | investor protection violation | 2022 | UK-FCA | £2,354,331 |
| Grant Thornton UK LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2021 | UK-FRC | £2,340,000 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2023 | UK-FRC | £2,256,625 |
| Matlock Recycling Limited | | | tax violations | 2017 | UK-HMRC | £2,227,887 |
| KPMG Audit Plc | KPMG | business services | accounting fraud or deficiencies | 2018 | UK-FRC | £2,212,000 |
| Ernst & Young LLP | Ernst & Young | business services | accounting fraud or deficiencies | 2021 | UK-FRC | £2,205,000 |
| Royal Bank of Scotland Group | NatWest Group PLC | financial services | banking violation | 2020 | UK-CMA | £2,200,000 |
| Kamros Cash and Carry Limited | | | tax violations | 2021 | UK-HMRC | £2,133,329 |
| Bank of Beirut (UK) Ltd | | | anti-money-laundering deficiencies | 2015 | UK-FCA | £2,100,000 |
| L & S Accounting Firm Umbrella Ltd | | | tax violations | 2024 | UK-HMRC | £2,074,840 |
| The TJM Partnership Limited | | | anti-money-laundering deficiencies | 2022 | UK-FCA | £2,038,700 |
| TJM Partnership | | | anti-money-laundering deficiencies | 2022 | UK-FCA | £2,038,700 |
| Ernst & Young LLP | Ernst & Young | business services | accounting fraud or deficiencies | 2017 | UK-FRC | £2,025,000 |
| MT Global Ltd | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,994,007 |
| PricewaterhouseCoopers LLP | PricewaterhouseCoopers | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £1,959,750 |
| Grant Thornton UK LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2020 | UK-FRC | £1,950,000 |
| Slatehouse Farm | | | tax violations | 2024 | UK-HMRC | £1,927,778 |
| Dedicated Outsourcing Ltd (Trading as 'Quadrant Service (UK)') | | | tax violations | 2023 | UK-HMRC | £1,896,815 |
| Mazars LLP | Mazars LLP | business services | accounting fraud or deficiencies | 2014 | UK-FRC | £1,870,000 |
| Henderson Investment Funds Ltd. | Janus Henderson | financial services | investor protection violation | 2019 | UK-FCA | £1,867,900 |
| Originals SP Zo.o | | | tax violations | 2023 | UK-HMRC | £1,856,628 |
| Deloitte LLP | Deloitte | business services | accounting fraud or deficiencies | 2020 | UK-ICAEW | £1,815,000 |
| AXA Wealth Services Ltd | Phoenix Group Holdings PLC | financial services | investor protection violation | 2013 | UK-FCA | £1,802,200 |
| P S Gill Construction Limited dba Parwinder Singh Construction | | | tax violations | 2023 | UK-HMRC | £1,798,261 |
| Babli Begum Ltd | | | tax violations | 2024 | UK-HMRC | £1,782,410 |
| Blinkin-Ink & Mobis Ltd t/a 'BIML and Blinking Ink' | | | tax violations | 2024 | UK-HMRC | £1,766,665 |
| Aircall International Ltd | | | tax violations | 2018 | UK-HMRC | £1,760,747 |
| Credit Suisse Securities (Europe) Limited et al. | UBS | financial services | investor protection violation | 2010 | UK-FSA | £1,750,000 |
| T W Telecommunications Ltd | | | tax violations | 2017 | UK-HMRC | £1,744,452 |
| Zamco Ltd | | | tax violations | 2019 | UK-HMRC | £1,736,633 |
| VC Solution Ltd | | | tax violations | 2021 | UK-HMRC | £1,717,052 |
| Webstar Dixon Limited | | | tax violations | 2023 | UK-HMRC | £1,712,097 |
| Grant Thornton UK LLP | Grant Thornton | business services | accounting fraud or deficiencies | 2022 | UK-FRC | £1,696,149 |
