Note: This ranking is based on the parent-subsidiary linkages at the time each penalty was announced. In cases of parent name changes, the latest name is used here. The parent names are linked to Violation Tracker UK search results in which the historical parent name appears.
| Rank | Parent at the Time of Penalty | Total Penalties | Number of Records  |
|---|---|---|---|
| 34 | Dwr Cymru Cyfyngedig (Welsh Water) | $79,733,023 | 234 |
| 17 | Southern Water | $220,182,092 | 105 |
| 21 | Thames Water Utilities Ltd. | $178,978,694 | 99 |
| 30 | Kelda Group | $108,988,228 | 95 |
| 38 | International Distributions Services PLC | $58,344,192 | 78 |
| 20 | BT | $184,068,055 | 59 |
| 24 | Tesco PLC | $169,163,749 | 58 |
| 70 | Network Rail | $25,575,066 | 49 |
| 8 | Lloyds Banking Group | $472,797,681 | 46 |
| 32 | KPMG | $93,729,645 | 40 |
| 68 | Aviva PLC | $25,884,014 | 37 |
| 54 | SSE plc | $37,986,895 | 34 |
| 3 | NatWest Group PLC | $706,828,931 | 33 |
| 33 | International Airlines Group | $81,522,460 | 30 |
| 46 | Centrica | $45,553,894 | 27 |
| 6 | Barclays | $535,912,704 | 26 |
| 61 | BAE Systems | $30,184,731 | 22 |
| 59 | Phoenix Group Holdings PLC | $30,812,925 | 22 |
| 62 | Prudential plc | $30,073,776 | 22 |
| 89 | J Sainsbury PLC | $13,620,269 | 21 |
| 96 | Go-Ahead Group PLC | $9,554,539 | 20 |
| 76 | EDF-Electricite de France | $20,299,431 | 20 |
| 11 | HSBC | $356,256,055 | 18 |
| 19 | National Grid | $197,439,938 | 18 |
| 81 | Grant Thornton | $16,957,067 | 18 |
| 100 | Walmart | $9,195,242 | 17 |
| 45 | E.ON | $47,731,454 | 16 |
| 69 | FP McCann Limited | $25,600,176 | 15 |
| 27 | Serco Group | $128,498,118 | 15 |
| 52 | Deloitte | $39,360,714 | 13 |
| 9 | Deutsche Bank | $397,353,826 | 12 |
| 49 | PricewaterhouseCoopers | $43,760,142 | 12 |
| 51 | RWE AG | $41,545,529 | 10 |
| 4 | Entain PLC | $637,949,362 | 10 |
| 48 | Cadent Gas Limited | $44,000,000 | 10 |
| 56 | Iberdrola | $33,297,467 | 9 |
| 22 | Banco Santander | $173,508,602 | 9 |
| 63 | Currys PLC | $30,031,641 | 8 |
| 39 | Meta Platforms Inc. | $52,500,000 | 8 |
| 58 | Drax Group PLC | $31,137,651 | 8 |
| 1 | Airbus | $1,021,639,861 | 8 |
| 7 | Rolls-Royce | $510,530,500 | 7 |
| 99 | Nationwide Building Society | $9,245,708 | 7 |
| 55 | 888 Holdings PLC | $36,436,779 | 6 |
| 5 | UBS | $547,645,400 | 6 |
| 15 | Citigroup | $282,197,562 | 6 |
| 18 | Virgin Group | $203,149,163 | 6 |
| 86 | OVO Energy | $14,950,379 | 6 |
| 78 | General Electric | $18,595,530 | 6 |
| 47 | G4S | $44,434,118 | 6 |
| 29 | Wood Group | $109,474,158 | 5 |
| 41 | Nordic Capital | $51,502,933 | 5 |
| 95 | Reckitt Benckiser | $10,923,421 | 5 |
| 35 | Petrofac Limited | $77,034,625 | 5 |
| 10 | JPMorgan Chase | $397,317,447 | 5 |
| 14 | Credit Suisse | $302,327,376 | 5 |
| 74 | GlaxoSmithKline | $22,055,000 | 5 |
| 25 | Goldman Sachs | $148,491,500 | 5 |
| 66 | Metro Bank PLC | $26,799,073 | 4 |
| 98 | William Hill plc | $9,291,614 | 4 |
| 92 | Telefonica | $12,010,000 | 4 |
| 83 | Vanquis Banking Group | $16,781,400 | 4 |
| 44 | Bank of America | $47,811,516 | 4 |
| 97 | BlackRock | $9,533,462 | 3 |
| 23 | Standard Chartered | $169,185,010 | 3 |
| 53 | Commerzbank | $38,701,084 | 3 |
| 79 | Marriott International | $18,473,182 | 3 |
| 42 | Banco de Sabadell | $48,650,000 | 3 |
| 64 | National Australia Bank | $29,582,800 | 3 |
| 84 | Alstom | $16,402,384 | 2 |
| 88 | Caesars Entertainment Corp. | $13,990,000 | 2 |
| 37 | Chemtura | $60,000,000 | 2 |
| 50 | Cinven Group | $41,956,620 | 2 |
| 13 | Coats Group PLC | $329,500,000 | 2 |
| 26 | Intas Pharmaceuticals Ltd. | $132,882,238 | 2 |
| 67 | Mitsubishi UFJ Financial Group | $26,775,000 | 2 |
| 93 | Equifax | $11,664,400 | 2 |
| 77 | Invesco | $18,652,310 | 2 |
| 16 | Glencore | $280,965,092 | 2 |
| 85 | TP ICAP PLC | $15,469,682 | 2 |
| 28 | Bank of New York Mellon | $126,009,465 | 2 |
| 71 | H.I.G. Capital | $25,000,000 | 2 |
| 12 | Taveta Investments | $343,000,000 | 1 |
| 90 | ByteDance | $12,700,000 | 1 |
| 73 | State Street Corp. | $22,885,000 | 1 |
| 40 | Connect Airways | $51,885,049 | 1 |
| 82 | Weir Group PLC | $16,900,000 | 1 |
| 65 | Rio Tinto | $27,385,400 | 1 |
| 31 | Rabobank | $105,000,000 | 1 |
| 80 | Julius Baer Group | $18,022,500 | 1 |
| 36 | Pfizer | $63,300,000 | 1 |
| 91 | PayPoint Group | $12,500,000 | 1 |
| 72 | M&G PLC | $23,875,000 | 1 |
| 2 | Nortel Networks | $1,000,000,000 | 1 |
| 94 | Holtzbrinck Publishing Group | $11,263,852 | 1 |
| 60 | Homeserve plc | $30,647,400 | 1 |
| 87 | ICAP PLC | $14,000,000 | 1 |
| 75 | Industrial and Commercial Bank of China | $21,730,000 | 1 |
| 43 | Monarch Airlines Limited | $48,154,044 | 1 |
| 57 | MasterCard | $31,560,062 | 1 |
