| SSE | SSE PLC | utilities and power generation | energy market violation | 2023 | UK-OFGEM | £252,000 |
| FM Model Agency Limited | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £251,000 |
| Viva Model Management London Limited and Viva Model Management Sarl | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £245,000 |
| H&L Garages Limited | | | price-fixing or anti-competitive practices | 2013 | UK-OFT | £242,076 |
| Rangers Football Club Limited and Rangers International Football Club Plc | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £225,000 |
| Brand-Rex Ltd | | | bribery | 2015 | UK-COPFS | £212,800 |
| URE Energy Limited | | | energy market violation | 2019 | UK-OFGEM | £209,013 |
| Economy Energy Trading Ltd | | | price-fixing or anti-competitive practices | 2019 | UK-OFGEM | £200,000 |
| Richard Worth Limited and Richard Worth Holdings Limited | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £193,911 |
| Tiofarma Beheer B.V. and Tiofarma B.V. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £186,442 |
| Sapien Capital Ltd | | | investor protection violation | 2021 | UK-FCA | £178,000 |
| Utilita Energy | | | energy market violation | 2019 | UK-OFGEM | £175,000 |
| Alissa Healthcare Research Ltd. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £174,912 |
| International Tubular Services Limited | | | bribery | 2014 | UK-COPFS | £172,200 |
| Greenslade Taylor Hunt | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £170,549 |
| Trod Limited | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £163,371 |
| Premier Model Management Limited | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £150,000 |
| Michael Hardy & Company (Wokingham) Limited and Geocharbert UK Ltd | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £142,843 |
| LCC Trans-Sending Ltd. and Small World Financial Services Group Ltd. t/a Small World | | | price-fixing or anti-competitive practices | 2023 | UK-FCA | £139,500 |
| Thomas Gunn Navigation Systems Ltd | | | bribery | 2012 | UK-COPFS | £138,000 |
| Balmoral Tanks Ltd. and Balmoral Group Holdings Ltd. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £130,000 |
| npower Direct Ltd. and npower Ltd. and npower Northern Ltd. and npower Yorkshire Ltd. | E.ON | utilities and power generation | energy market violation | 2014 | UK-OFGEM | £125,328 |
| Opus Energy Limited | Drax Group PLC | utilities and power generation | energy market violation | 2012 | UK-OFGEM | £125,000 |
| Road Range Limited | | | price-fixing or anti-competitive practices | 2013 | UK-OFT | £115,774 |
| Crosfill & Archer Claims Limited | | | privacy violation | 2021 | UK-FCA | £110,000 |
| Symbio Energy Limited | | | energy market violation | 2021 | UK-OFGEM | £100,000 |
| Electricity North West Limited | | | energy market violation | 2011 | UK-OFGEM | £100,000 |
| SSE | SSE PLC | utilities and power generation | energy market violation | 2015 | UK-OFGEM | £100,000 |
| Gary Berryman Estate Agents Ltd. and Warne Investments Ltd. | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £93,555 |
| Trinity Mirror Southern Ltd. and Trinity Mirror plc | | | price-fixing or anti-competitive practices | 2015 | UK-CMA | £91,257 |
| King Pharmaceuticals Ltd. and Praze Consultants Ltd. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £75,573 |
| King Pharmaceuticals Ltd. and Praze Consultants Ltd. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £75,573 |
| Delta Gas and Power Limited | | | energy market violation | 2023 | UK-OFGEM | £70,000 |
| Oakley Interiors Ltd. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £58,558 |
| Delta Gas and Power Limited | | | energy market violation | 2022 | UK-OFGEM | £57,000 |
| Whoop Energy | | | energy market violation | 2021 | UK-OFGEM | £56,306 |
| West Coast Property Services (UK) Limited | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £55,624 |
| Waterfords (Estate Agents) Limited | | | price-fixing or anti-competitive practices | 2015 | UK-CMA | £46,186 |
| Salegroup Limited (The) | | | price-fixing or anti-competitive practices | 2019 | UK-OFCOM | £40,000 |
| Glyn Jackson Communications Limited | | | price-fixing or anti-competitive practices | 2013 | UK-OFT | £35,700 |
| Abbott and Frost Estate Agents Limited | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £30,099 |
| Avro Energy | | | energy market violation | 2021 | UK-OFGEM | £30,000 |
| Asda Group Ltd | EG Group | retailing | price-fixing or anti-competitive practices | 2023 | UK-CMA | £30,000 |
| allpay Limited | | | price-fixing or anti-competitive practices | 2022 | UK-PSR | £28,553 |
| Fender Musical Instruments Europe Limited | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £25,000 |
| Copart, Inc.and CPRT LLP and Copart UK Limited | Copart Inc. | information services | price-fixing or anti-competitive practices | 2023 | UK-CMA | £25,000 |
| KW Supplies Ltd. | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £22,248 |
| Saxons PS Limited | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £20,257 |
| Entice Energy | | | energy market violation | 2021 | UK-OFGEM | £20,000 |
| SSE Energy Services | OVO Energy | utilities and power generation | energy market violation | 2021 | UK-OFGEM | £20,000 |
| Dyball Associates | | | price-fixing or anti-competitive practices | 2019 | UK-OFGEM | £20,000 |
| Castles Property Services Limited | | | price-fixing or anti-competitive practices | 2015 | UK-CMA | £17,348 |
| Peter O'Rourke Electrical Limited | | | price-fixing or anti-competitive practices | 2013 | UK-OFT | £15,933 |
| Hafiz Bros Travel & Money Transfer Limited | | | price-fixing or anti-competitive practices | 2023 | UK-FCA | £11,200 |
| Coriolis Projects Ltd. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £7,735 |
| Dollar East (International Travel & Money Transfer) Ltd | | | price-fixing or anti-competitive practices | 2023 | UK-FCA | £3,600 |
| The Association of Model Agents Limited | | | price-fixing or anti-competitive practices | 2016 | UK-CMA | £2,500 |
| Owens Installations Limited | | | price-fixing or anti-competitive practices | 2013 | UK-OFT | £1,777 |
| Sulion | | | price-fixing or anti-competitive practices | 2022 | UK-PSR | £572 |
| Three Counties Estate Agents Limited | | | price-fixing or anti-competitive practices | 2015 | UK-CMA | £90 |
| Marks and Spencer plc | Marks and Spencer Group PLC | retailing | price-fixing or anti-competitive practices | 2023 | UK-CMA | £0 |
| Wm Morrison Supermarkets Limited | Clayton Dubilier & Rice | private equity (including portfolio companies) | price-fixing or anti-competitive practices | 2023 | UK-CMA | £0 |
| Freightliner | Brookfield Corporation | diversified | price-fixing or anti-competitive practices | 2015 | UK-ORR | £0 |
| Rail Assessment Centre Forum (RACF) | | | price-fixing or anti-competitive practices | 2022 | UK-ORR | £0 |
| Severn Trent PLC | Severn Trent PLC | utilities and power generation | price-fixing or anti-competitive practices | 2012 | UK-OFWAT | £0 |
| Thames Water | Thames Water Utilities Ltd. | utilities and power generation | price-fixing or anti-competitive practices | 2022 | UK-OFWAT | £0 |
| Bristol Water | Pennon Group PLC | utilities and power generation | price-fixing or anti-competitive practices | 2015 | UK-OFWAT | £0 |
| East Midlands International Airport Ltd | | | price-fixing or anti-competitive practices | 2016 | UK-CAA | £0 |
| Prestige Parking Ltd | | | price-fixing or anti-competitive practices | 2016 | UK-CAA | £0 |
| Education Software Solutions Limited | | | price-fixing or anti-competitive practices | 2023 | UK-CMA | £0 |
| DFDS A/S | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| P&O Ferries Holdings Limited | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Moto Hospitality Limited | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Moto Holdings Limited | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Roadchef Limited | Macquarie | financial services | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Extra MSA Property (UK) Limited | | | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Google | Alphabet Inc. | information technology | price-fixing or anti-competitive practices | 2022 | UK-CMA | £0 |
| Showmen's Guild of Great Britain | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £0 |
| ATG Media | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £0 |
| Leonard D Morgan & Co | | | consumer protection violation | 2024 | UK-PRO | £0 |
| BP Auctions Ltd | | | consumer protection violation | 2024 | UK-PRO | £0 |
| Bank of Ireland UK plc | Bank of Ireland | financial services | banking violation | 2021 | UK-CMA | £0 |
| Monzo Bank Limited | | | banking violation | 2021 | UK-CMA | £0 |
| NatWest Group | NatWest Group PLC | financial services | banking violation | 2021 | UK-CMA | £0 |
| ICC Intercertus Capital Ltd | | | investor protection violation | 2021 | UK-FCA | £0 |
| Finteractive Limited (trading as FXVC) | | | investor protection violation | 2021 | UK-FCA | £0 |
| Virgin Money UK plc | Nationwide Building Society | financial services | banking violation | 2021 | UK-CMA | £0 |
| Co-operative Group Limited | Co-operative Group Limited | retailing | Groceries Supply Code of Conduct violation | 2019 | UK-GCA | £0 |
| Tesco | Tesco PLC | retailing | Groceries Supply Code of Conduct violation | 2016 | UK-GCA | £0 |
| Essential Pharma | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| Mabey Hire Ltd | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| Hanson UK | Heidelberg Materials | building materials | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| Yamaha Music Europe GmbH | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| Amilco Ltd. | | | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| Tesco plc | Tesco PLC | retailing | price-fixing or anti-competitive practices | 2020 | UK-CMA | £0 |
| The Romans Group (UK) Limited and Romans 1 Limited | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £0 |
| Bluu Solutions Ltd and Bluuco Ltd. and Tetris Projects Ltd. and Jones Lang LaSalle Inc. | | | price-fixing or anti-competitive practices | 2019 | UK-CMA | £0 |
| Heathrow T5 Ltd. and Arora Holdings Ltd. | | | price-fixing or anti-competitive practices | 2018 | UK-CMA | £0 |
| Turner Topco Ltd. and ATG Media Holdings Ltd. and ATG Media Ltd. and Metropress Ltd. | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £0 |
| Annagram Estates Limited dba CJ Hole | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £0 |
| BHK (UK) Ltd. and BHK Holz-u Kunststoff KG | | | price-fixing or anti-competitive practices | 2017 | UK-CMA | £0 |
