| Airbus SE | Airbus | aerospace and military contracting | bribery | 2020 | UK-SFO | £991,000,000 |
| Entain plc | Entain PLC | entertainment | bribery | 2023 | UK-HMRC | £615,000,000 |
| Rolls-Royce PLC | Rolls-Royce | aerospace and military contracting | bribery | 2017 | UK-SFO | £510,250,000 |
| Barclays Bank plc | Barclays | financial services | foreign exchange market manipulation | 2015 | UK-FCA | £284,432,000 |
| Glencore Energy (UK) Ltd | Glencore | financial services | bribery | 2022 | UK-SFO | £280,965,092 |
| UBS AG | UBS | financial services | foreign exchange market manipulation | 2014 | UK-FCA | £233,814,000 |
| Deutsche Bank AG | Deutsche Bank | financial services | interest rate benchmark manipulation | 2015 | UK-FCA | £226,800,000 |
| Citibank N.A. | Citigroup | financial services | foreign exchange market manipulation | 2014 | UK-FCA | £225,575,000 |
| JPMorgan Chase Bank N.A. | JPMorgan Chase | financial services | foreign exchange market manipulation | 2014 | UK-FCA | £222,166,000 |
| The Royal Bank of Scotland plc | NatWest Group PLC | financial services | foreign exchange market manipulation | 2014 | UK-FCA | £217,000,000 |
| HSBC Bank plc | HSBC | financial services | foreign exchange market manipulation | 2014 | UK-FCA | £216,363,000 |
| UBS AG | UBS | financial services | interest rate benchmark manipulation | 2012 | UK-FSA | £160,000,000 |
| National Grid Electricity Transmission plc and Scottish Power Transmission plc | National Grid | utilities and power generation | consumer protection violation | 2021 | UK-OFGEM | £158,000,000 |
| Auden Mckenzie and Actavis UK | Intas Pharmaceuticals Ltd. | pharmaceuticals | price-fixing or anti-competitive practices | 2023 | UK-CMA | £130,000,000 |
| British Telecommunications plc | BT | telecommunications | price-fixing or anti-competitive practices | 2012 | UK-OFCOM | £117,042,000 |
| Lloyds Bank plc and Bank of Scotland plc | Lloyds Banking Group | financial services | interest rate benchmark manipulation | 2014 | UK-FCA | £105,000,000 |
| Cooperatieve Centrale Raiffeisen-Boerenleenbank B.A. | Rabobank | financial services | interest rate benchmark manipulation | 2013 | UK-FCA | £105,000,000 |
| Amec Foster Wheeler Limited | Wood Group | oilfield services and supplies | bribery | 2021 | UK-SFO | £103,000,000 |
| The Royal Bank of Scotland plc | NatWest Group PLC | financial services | interest rate benchmark manipulation | 2013 | UK-FSA | £87,500,000 |
| Petrofac Limited | Petrofac Limited | oilfield services and supplies | bribery | 2021 | UK-SFO | £77,034,625 |
| Pfizer Limited | Pfizer | pharmaceuticals | price-fixing or anti-competitive practices | 2022 | UK-CMA | £63,300,000 |
| Barclays Bank plc | Barclays | financial services | interest rate benchmark manipulation | 2012 | UK-FSA | £59,500,000 |
| British Airways | International Airlines Group | airlines | price-fixing or anti-competitive practices | 2012 | UK-OFT | £58,500,000 |
| Facebook | Meta Platforms Inc. | information technology | price-fixing or anti-competitive practices | 2021 | UK-CMA | £50,500,000 |
| Royal Mail plc | International Distributions Services PLC | miscellaneous services | price-fixing or anti-competitive practices | 2018 | UK-OFCOM | £50,000,000 |
| Cadent Gas Limited | Cadent Gas Limited | utilities and power generation | energy market violation | 2019 | UK-OFGEM | £44,000,000 |
| British Telecommunications plc | BT | telecommunications | price-fixing or anti-competitive practices | 2017 | UK-OFCOM | £42,000,000 |
| Advanz Pharma | Nordic Capital | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2021 | UK-CMA | £40,900,000 |
| InterGen | | | energy market violation | 2020 | UK-OFGEM | £37,200,000 |
| Cinven | Cinven Group | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2021 | UK-CMA | £37,100,000 |
| Mastercard | MasterCard | financial services | price-fixing or anti-competitive practices | 2022 | UK-PSR | £31,560,062 |
| GPT Special Project Management Ltd/Airbus | Airbus | aerospace and military contracting | bribery | 2021 | UK-SFO | £30,324,920 |
| BAE Systems plc | BAE Systems | aerospace and military contracting | bribery | 2010 | UK-SFO | £30,000,000 |
| Royal Bank of Scotland Group plc | NatWest Group PLC | financial services | price-fixing or anti-competitive practices | 2011 | UK-OFT | £28,590,000 |
| FP McCann Limited | FP McCann Limited | construction and engineering | price-fixing or anti-competitive practices | 2020 | UK-CMA | £25,449,676 |
| Drax PowerLimited | Drax Group PLC | utilities and power generation | energy market violation | 2015 | UK-OFGEM | £25,000,000 |
| EP SHB Limited | | | energy market violation | 2023 | UK-OFGEM | £23,630,000 |
| GlaxoSmithKline plc and GlaxoSmithKline UK Ltd. and SmithKline Beecham Ltd. and Beecham Group plc | GlaxoSmithKline | pharmaceuticals | price-fixing or anti-competitive practices | 2016 | UK-CMA | £22,000,000 |
| ICBC Standard Bank Plc | Industrial and Commercial Bank of China | financial services | bribery | 2015 | UK-SFO | £21,730,000 |
| Alstom Power Ltd | General Electric | diversified | bribery | 2018 | UK-SFO | £18,038,000 |
| Erith Contractors Ltd and Erith Holdings Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £17,568,800 |
| Weir Group Plc | Weir Group PLC | industrial equipment | bribery | 2010 | UK-COPFS | £16,900,000 |
| Alstom Network UK Ltd | Alstom | miscellaneous energy products and systems | bribery | 2019 | UK-SFO | £16,400,000 |
| Keltbray Ltd and Keltbray Holdings Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £16,000,000 |
| ICAP Europe Ltd | TP ICAP PLC | financial services | interest rate benchmark manipulation | 2013 | UK-FCA | £14,000,000 |
| PayPoint Plc | PayPoint Group | financial services | energy market violation | 2021 | UK-OFGEM | £12,500,000 |
| Robin Hood Energy Limited | | | energy market violation | 2020 | UK-OFGEM | £12,091,824 |
| Macmillan Publishers Limited | Holtzbrinck Publishing Group | media | bribery | 2011 | UK-SFO | £11,263,852 |
| Vp plc | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £11,235,660 |
| Sainsbury's Supermarkets Limited and J Sainsbury plc | J Sainsbury PLC | retailing | price-fixing or anti-competitive practices | 2011 | UK-OFT | £11,040,000 |
| Intergen | | | energy market violation | 2015 | UK-OFGEM | £11,000,000 |
| British Gas | Centrica | utilities and power generation | energy market violation | 2015 | UK-OFGEM | £10,600,000 |
| Reckitt Benckiser Healthcare (UK) Ltd. and Reckitt Benckiser Group plc | Reckitt Benckiser | household and personal care products | price-fixing or anti-competitive practices | 2011 | UK-OFT | £10,175,000 |
| Aspen Pharmacare Holdings Ltd. et al. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £10,101,954 |
| SSE Generation Limited | SSE PLC | utilities and power generation | energy market violation | 2023 | UK-OFGEM | £9,780,000 |
| Asda Stores Ltd. and Asda Group Ltd. and Wal-Mart Stores (UK) Ltd. and Broadstreet Great Wilson Europe Ltd. | EG Group | retailing | price-fixing or anti-competitive practices | 2011 | UK-OFT | £9,100,000 |
| Innospec Ltd | Innospec | chemicals | bribery | 2010 | UK-SFO | £8,528,940 |
| T. E. Scudder Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £8,256,264 |
| H.J. Enthoven Limited and Eco-Bat Technologies Limited | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £8,076,504 |
| National Grid Gas plc | National Gas Transmission PLC | utilities and power generation | energy market violation | 2011 | UK-OFGEM | £8,000,000 |
| Alliance Pharmaceuticals Limited and Alliance Pharma plc | Alliance Pharma PLC | pharmaceuticals | price-fixing or anti-competitive practices | 2022 | UK-CMA | £7,900,000 |
| Stanton Bonna Concrete Limited et al. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £7,474,745 |
| Focus Pharmaceuticals Limited and Mercury Pharma Group Ltd. and Concordia Investments (Jersey) Ltd. and Advanz Pharma Corp. Ltd. et al. | Nordic Capital | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2022 | UK-CMA | £7,288,853 |
| Dairy Crest Limited and Dairy Crest Group plc | Saputo | food products | price-fixing or anti-competitive practices | 2011 | UK-OFT | £7,140,000 |
| M.W. Kellogg Limited | | | bribery | 2011 | UK-SFO | £7,028,077 |
| E.ON UK Plc and E.ON Energy Solutions Ltd. | E.ON | utilities and power generation | energy market violation | 2015 | UK-OFGEM | £7,000,000 |
| Willis Limited | Willis Towers Watson | financial services | bribery | 2011 | UK-FSA | £6,895,000 |
| Lexon (UK) Limited | Bestway Healthcare | healthcare services | price-fixing or anti-competitive practices | 2022 | UK-CMA | £6,706,220 |
| Flynn Pharma Limited | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £6,704,422 |
| Sarclad Ltd | | | bribery | 2019 | UK-SFO | £6,553,085 |
| Tesco Stores Limited and Tesco Holdings Limited and Tesco plc | Tesco PLC | retailing | price-fixing or anti-competitive practices | 2013 | UK-OFT | £6,500,000 |
| John Wood Group PLC | Wood Group | oilfield services and supplies | bribery | 2017 | UK-COPFS | £6,460,000 |
| BT Group plc | BT | telecommunications | price-fixing or anti-competitive practices | 2020 | UK-OFCOM | £6,300,000 |
| HGCapital | Hg Capital | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2021 | UK-CMA | £6,200,000 |
| Drax Pumped Storage Limited | Drax Group PLC | utilities and power generation | energy market violation | 2023 | UK-OFGEM | £6,120,000 |
| ESB Independent Generation Trading Limited and Carrington Power Limited | | | energy market violation | 2021 | UK-OFGEM | £6,000,000 |
| EDF Energy (Thermal Generation) Limited | EDF-Electricite de France | utilities and power generation | energy market violation | 2020 | UK-OFGEM | £6,000,000 |
| Generics (UK) Ltd and Merck KGaA | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £5,841,286 |
| Safeway Stores Limited and Strores Group Limited and Safeway Limited | Clayton Dubilier & Rice | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2011 | UK-OFT | £5,690,000 |
| Abbot Group Limited | | | bribery | 2012 | UK-COPFS | £5,600,000 |
| John F Hunt Ltd and John F Hunt Group Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £5,600,000 |
| Morgan Stanley & Co. International plc | Morgan Stanley | financial services | energy market violation | 2023 | UK-OFGEM | £5,411,149 |
| Roland (U.K.) Limited and Roland Corp. | | | price-fixing or anti-competitive practices | 2021 | UK-CMA | £5,004,151 |
| Cinven Capital Management (V) GP Ltd. and Cinven Partners LLP et al. | Cinven Group | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2022 | UK-CMA | £4,856,620 |
| DePuy International Limited | Johnson & Johnson | pharmaceuticals | bribery | 2011 | UK-SFO | £4,829,000 |
| SSE Energy Services | OVO Energy | utilities and power generation | consumer protection violation | 2019 | UK-OFGEM | £4,775,705 |
| Fender Musical Instruments Europe Ltd. and Fender Musical Instruments Corp. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £4,531,185 |
| Hornsea 1 Limited | | | energy market violation | 2020 | UK-OFGEM | £4,500,000 |
| RWE Generation UK plc | RWE AG | utilities and power generation | energy market violation | 2020 | UK-OFGEM | £4,500,000 |
| British Gas Trading Limited | Centrica | utilities and power generation | energy market violation | 2017 | UK-OFGEM | £4,500,000 |
| JD Sports | JD Sports Fashion | retailing | price-fixing or anti-competitive practices | 2022 | UK-CMA | £4,320,000 |
| Area Sq Ltd. and Cube Interior Solutions Ltd. and Fourfront Group Ltd. and Fourfront Holdings Ltd. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £4,143,304 |
| CPM Group Limited | Marshalls PLC | building materials | price-fixing or anti-competitive practices | 2019 | UK-CMA | £4,000,000 |
| M.G.F (Trench Construction Systems) Ltd | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £3,773,910 |
| McGee Group (Holdings) Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £3,766,278 |
| Casio Electronics Co. Ltd. and Casio Computer Co., Ltd. | Casio Computer Co. | miscellaneous manufacturing | price-fixing or anti-competitive practices | 2019 | UK-CMA | £3,695,535 |
| Ampoweruk | | | energy market violation | 2021 | UK-OFGEM | £3,590,237 |
| Utilita | | | consumer protection violation | 2017 | UK-OFGEM | £3,580,000 |
| Medreich plc and Medreich Ltd and Meiji Seika Pharma Co. Ltd and Meiji Holdings Co. Ltd. | Meiji Group | food products | price-fixing or anti-competitive practices | 2022 | UK-CMA | £3,452,446 |
| British Gas | Centrica | utilities and power generation | energy market violation | 2023 | UK-OFGEM | £3,370,000 |
| Robert Wiseman & Sons Limited and Robert Wiseman Dairies plc | | | price-fixing or anti-competitive practices | 2011 | UK-OFT | £3,200,000 |
