| UK Insurance Limited | Direct Line Insurance Group PLC | financial services | insurance violation | 2012 | UK-FSA | £2,170,000 |
| United Gas & Power Limited | | | consumer protection violation | 2023 | UK-OFGEM | £2,111,798 |
| BGO Entertainment Limited | | | gambling industry violation | 2020 | UK-GC | £2,031,023 |
| 32Red Limited | | | gambling industry violation | 2018 | UK-GC | £2,024,046 |
| Good Energy Limited | | | consumer protection violation | 2023 | UK-OFGEM | £2,009,294 |
| Nationwide Building Society | Nationwide Building Society | financial services | insurance violation | 2019 | UK-CMA | £2,000,000 |
| Sunrise Senior Living Ltd. | | | consumer protection violation | 2018 | UK-CMA | £2,000,000 |
| RWE Npower plc | E.ON | utilities and power generation | consumer protection violation | 2012 | UK-OFGEM | £2,000,000 |
| Network Rail | Network Rail | miscellaneous services | consumer protection violation | 2015 | UK-ORR | £2,000,000 |
| npower | E.ON | utilities and power generation | consumer protection violation | 2011 | UK-OFGEM | £2,000,000 |
| Videoslots Limited | | | gambling industry violation | 2023 | UK-GC | £2,000,000 |
| Videoslots Limited | | | gambling industry violation | 2023 | UK-GC | £2,000,000 |
| OVO Energy Limited | OVO Energy | utilities and power generation | consumer protection violation | 2023 | UK-OFGEM | £1,998,647 |
| Scottish Power | Iberdrola | utilities and power generation | consumer protection violation | 2021 | UK-OFGEM | £1,967,465 |
| Hutchison 3G UK Ltd dba Three | CK Hutchison Holdings | diversified | telecommunications violation | 2017 | UK-OFCOM | £1,890,000 |
| JLT Specialty Limited | Marsh & McLennan | financial services | insurance violation | 2013 | UK-FCA | £1,876,000 |
| National Westminster Bank Plc et al. | NatWest Group PLC | financial services | consumer protection violation | 2022 | UK-PSR | £1,820,000 |
| Silverbond Enterprises Limited dba Park Lane Club | | | gambling industry violation | 2019 | UK-GC | £1,800,000 |
| Co-operative Energy | | | consumer protection violation | 2016 | UK-OFGEM | £1,800,000 |
| Outfox The Market | | | consumer protection violation | 2023 | UK-OFGEM | £1,800,000 |
| BV Gaming Limited | | | gambling industry violation | 2022 | UK-GC | £1,728,000 |
| E.ON | E.ON | utilities and power generation | consumer protection violation | 2012 | UK-OFGEM | £1,700,000 |
| Platinum Gaming Limited | | | gambling industry violation | 2019 | UK-GC | £1,629,420 |
| TalkTalk Telecom Limited | TalkTalk Telecom Group Limited | telecommunications | consumer protection violation | 2011 | UK-OFCOM | £1,524,728 |
| Tiscali UK Limited | TalkTalk Telecom Group Limited | telecommunications | consumer protection violation | 2011 | UK-OFCOM | £1,512,392 |
| Royal Bank of Scotland Group | NatWest Group PLC | financial services | insurance violation | 2019 | UK-CMA | £1,500,000 |
| Royal Mail Group plc | International Distributions Services PLC | miscellaneous services | consumer protection violation | 2020 | UK-OFCOM | £1,500,000 |
| Dar Lighting Ltd and Castlegate 624 | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £1,500,000 |
| Betit Operations Limited | | | gambling industry violation | 2019 | UK-GC | £1,418,732 |
| Shell Energy Retail Limited | Octopus Energy Limited | utilities and power generation | consumer protection violation | 2023 | UK-OFCOM | £1,400,000 |
| giffgaff Limited | VMED O2 UK Limited | telecommunications | consumer protection violation | 2019 | UK-OFCOM | £1,400,000 |
| Spreadex Limited | | | gambling industry violation | 2022 | UK-GC | £1,360,000 |
| White Hat Gaming Limited | | | gambling industry violation | 2021 | UK-GC | £1,343,871 |
| LeoVegas Gaming PLC | | | gambling industry violation | 2022 | UK-GC | £1,320,000 |
| Gamesys Operations Limited | Bally's Corporation | entertainment | gambling industry violation | 2019 | UK-GC | £1,319,420 |
| Hillside New Media Ltd. | bet365 | entertainment | gambling industry violation | 2014 | UK-GC | £1,274,000 |
| British Gas/ Centrica | Centrica | utilities and power generation | consumer protection violation | 2021 | UK-OFGEM | £1,269,095 |
| Ticketmaster UK Limited | Live Nation Entertainment | entertainment | privacy violation | 2020 | UK-ICO | £1,250,000 |
| Taptronic FZC | | | telecommunications violation | 2021 | UK-PSA | £1,250,000 |
| Wizz Air Holdings Plc | Wizz Air Holdings PLC | airlines | consumer protection violation | 2023 | UK-CAA | £1,240,000 |
| Shell | Shell PLC | oil and gas | consumer protection violation | 2021 | UK-OFGEM | £1,217,203 |
| Bonne Terre Limited dba Sky Betting and Gaming | Flutter Entertainment PLC | entertainment | gambling industry violation | 2022 | UK-GC | £1,170,000 |
| Camelot UK Lotteries Ltd | Allwyn AG | entertainment | gambling industry violation | 2018 | UK-GC | £1,150,000 |
| Call Support | | | telecommunications violation | 2023 | UK-PSA | £1,150,000 |
| Millburn Insurance Company Limited | | | consumer protection violation | 2016 | UK-FCA | £1,137,500 |
| British Gas | Centrica | utilities and power generation | consumer protection violation | 2017 | UK-OFGEM | £1,100,000 |
| Bonne Terre Limited dba SkyBetting and Gaming | Flutter Entertainment PLC | entertainment | gambling industry violation | 2018 | UK-GC | £1,008,594 |
| Gala Interactive (Gibraltar) Limited | Entain PLC | entertainment | gambling industry violation | 2017 | UK-GC | £1,000,000 |
| Care UK Health and Social Care Holdings Ltd. and Care UK Community Partnerships Ltd. | Bridgepoint Group PLC | private equity (including portfolio companies) | consumer protection violation | 2020 | UK-CMA | £1,000,000 |
| EE Limited | BT | telecommunications | consumer protection violation | 2015 | UK-OFCOM | £1,000,000 |
| SSE plc | SSE PLC | utilities and power generation | consumer protection violation | 2018 | UK-OFGEM | £1,000,000 |
| Salvatet Inversiones SL | | | telecommunications violation | 2020 | UK-PSA | £1,000,000 |
| Videoslots | | | gambling industry violation | 2018 | UK-GC | £1,000,000 |
| Rank Digital Gaming (Alderney) Limited and Grosvenor Casinos Ltd. | | | gambling industry violation | 2015 | UK-GC | £1,000,000 |
| Barclays | Barclays | financial services | consumer protection violation | 2022 | UK-CMA | £1,000,000 |
| UKPN | | | consumer protection violation | 2014 | UK-OFGEM | £1,000,000 |
| British Gas | Centrica | utilities and power generation | consumer protection violation | 2014 | UK-OFGEM | £1,000,000 |
| Npower | E.ON | utilities and power generation | consumer protection violation | 2013 | UK-OFGEM | £1,000,000 |
| SSE | SSE PLC | utilities and power generation | consumer protection violation | 2021 | UK-OFGEM | £983,334 |
| BES Commerical Electricity Ltd. and Business Energy Solutions Ltd. | | | consumer protection violation | 2015 | UK-OFGEM | £980,000 |
| Lloyds Banking Group plc | Lloyds Banking Group | financial services | insurance violation | 2021 | UK-CMA | £957,000 |
| Vodafone Limited | Vodafone Group PLC | telecommunications | consumer protection violation | 2016 | UK-OFCOM | £925,000 |
| KCOM Group PLC | | | telecommunications violation | 2017 | UK-OFCOM | £900,000 |
| Northern Gas Networks Ltd. | Northern Gas Networks | utilities and power generation | consumer protection violation | 2012 | UK-OFGEM | £900,000 |
| Moblix Media Limited | | | telecommunications violation | 2021 | UK-PSA | £900,000 |
| Plusnet plc | BT | telecommunications | consumer protection violation | 2017 | UK-OFCOM | £880,000 |
| Gala Coral Group Ltd. | Entain PLC | entertainment | gambling industry violation | 2016 | UK-GC | £876,600 |
| Caesars Entertainment (UK) Ltd | Silver Point Capital | private equity (including portfolio companies) | gambling industry violation | 2015 | UK-GC | £875,000 |
| De Veritate Sumus Ltd | | | telecommunications violation | 2017 | UK-PSA | £850,000 |
| Utilita Energy | | | consumer protection violation | 2022 | UK-OFGEM | £830,000 |
| Petfre (Gibraltar) Ltd dba Betfred.com | | | gambling industry violation | 2016 | UK-GC | £817,740 |
| TFS Loans Ltd | | | consumer protection violation | 2022 | UK-FCA | £811,900 |
| Green Star Energy | | | consumer protection violation | 2021 | UK-OFGEM | £808,351 |
| British Telecommunications plc | BT | telecommunications | consumer protection violation | 2015 | UK-OFCOM | £800,000 |
| Buzz Group Ltd | | | gambling industry violation | 2021 | UK-GC | £780,000 |
| Buzz Group Limited | | | gambling industry violation | 2021 | UK-GC | £780,000 |
| EU Lotto Limited | | | gambling industry violation | 2021 | UK-GC | £760,000 |
| Netbet Enterprises Limited | | | gambling industry violation | 2020 | UK-GC | £756,806 |
| Scottish Power Energy Retail Limited | Iberdrola | utilities and power generation | consumer protection violation | 2014 | UK-OFGEM | £750,001 |
| Globo Mobile Kommunikation UG | | | telecommunications violation | 2021 | UK-PSA | £750,000 |
| Entertainmob Kommunikation UG | | | telecommunications violation | 2021 | UK-PSA | £750,000 |
| TCS Combined Solutions Limited | | | telecommunications violation | 2021 | UK-PSA | £750,000 |
| Les Ambassadeurs Club Limited | | | gambling industry violation | 2014 | UK-GC | £750,000 |
| Scottish and Southern Energy Power Distribution | SSE PLC | utilities and power generation | consumer protection violation | 2014 | UK-OFGEM | £750,000 |
| Connect You Limited | | | telecommunications violation | 2023 | UK-PSA | £750,000 |
| Octopus Energy | Octopus Energy Limited | utilities and power generation | consumer protection violation | 2023 | UK-OFGEM | £750,000 |
| Triplebet Limited | | | gambling industry violation | 2020 | UK-GC | £739,099 |
| Aspers (Stratford City) Limited | | | gambling industry violation | 2020 | UK-GC | £730,733 |
| MT SecureTrade Limited | | | gambling industry violation | 2019 | UK-GC | £715,301 |
| Tobaji Limited | | | telecommunications violation | 2018 | UK-PSA | £700,000 |
| Greentube Alderney Limited | | | gambling industry violation | 2021 | UK-GC | £693,789 |
| Lindar Media Limited | | | gambling industry violation | 2023 | UK-GC | £690,947 |
| One Call Insurance Services Ltd. | | | insurance violation | 2018 | UK-FCA | £684,000 |
| Green Star Energy | | | consumer protection violation | 2018 | UK-OFGEM | £679,283 |
| NSUS Limited | | | anti-money-laundering deficiencies | 2022 | UK-GC | £672,829 |
| Good Energy Limited | | | consumer protection violation | 2022 | UK-OFGEM | £653,000 |
| Global Awareness Ltd | | | telecommunications violation | 2017 | UK-PSA | £650,000 |
| Utility Warehouse | Telecom Plus PLC | utilities and power generation | consumer protection violation | 2020 | UK-OFGEM | £650,000 |
| DK Call Ltd | | | telecommunications violation | 2017 | UK-PSA | £645,000 |
| FSB Technology (UK) Limited | | | gambling industry violation | 2020 | UK-GC | £634,300 |
| Smarkets (Malta) Limited | | | gambling industry violation | 2022 | UK-GC | £630,000 |
