| Island Financial Solutions Limited | | | investor protection violation | 2020 | UK-IOM | £62,996 |
| Island Homes Kent Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,500 |
| Isle of Man Assurance Limited | | | anti-money-laundering deficiencies | 2020 | UK-IOM | £87,108 |
| Isle of Man Insurance Management Limited | | | anti-money-laundering deficiencies | 2020 | UK-IOM | £7,770 |
| Istanbul Grill Limited | | | tax violations | 2017 | UK-HMRC | £241,100 |
| Istanbul Kebabs | | | tax violations | 2023 | UK-HMRC | £32,171 |
| ISupply Drivers Limited | | | tax violations | 2023 | UK-HMRC | £179,231 |
| Italia Food &Wain Ltd | | | tax violations | 2023 | UK-HMRC | £27,838 |
| ITL Motor Group Ltd | | | tax violations | 2023 | UK-HMRC | £21,767 |
| Ivers Investments Limited fka Sheridan Gillis Investment Holdings Limited. | | | tax violations | 2022 | UK-HMRC | £127,875 |
| Iwaan Property Management Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| IZ Solutions Limited | | | tax violations | 2024 | UK-HMRC | £50,685 |
| J & AR London Limited AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,350 |
| J Ahmed & Co Limited | | | anti-money-laundering deficiencies | 2021 | UK-ICAEW | £2,100 |
| J G Projects | | | tax violations | 2018 | UK-HMRC | £21,936 |
| J H Greenwood FCA | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £323 |
| J J Timisoreana Ltd | | | tax violations | 2019 | UK-HMRC | £61,411 |
| J Ketley Services | | | tax violations | 2022 | UK-HMRC | £11,906 |
| J M Construction (Leeds) Limited | | | tax violations | 2018 | UK-HMRC | £13,976 |
| J O Lindsay Contractors (UK) Limited | | | tax violations | 2023 | UK-HMRC | £21,961 |
| J P Products (Kidderminster) Ltd | | | tax violations | 2019 | UK-HMRC | £225,267 |
| J P Walters & Co Ltd | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £5,000 |
| J R & M McGinty ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| J W Hinks LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £2,100 |
| J W Walsh Accountants 2018 Ltd | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £2,000 |
| J Weekday Limited dba Jade Dragon House | | | tax violations | 2018 | UK-HMRC | £25,463 |
| J.P. Morgan International Bank Limited | JPMorgan Chase | financial services | investor protection violation | 2013 | UK-FCA | £3,076,200 |
| J.P. Morgan Securities Ltd. | JPMorgan Chase | financial services | investor protection violation | 2010 | UK-FSA | £33,320,000 |
| J.P.Logan Construction Plant Hire and Sales | | | tax violations | 2023 | UK-HMRC | £23,036 |
| Jackson Grundy Limited | | | anti-money-laundering deficiencies | 2014 | UK-OFT | £169,652 |
| JAD Transport | | | tax violations | 2016 | UK-HMRC | £57,381 |
| Jaffer & Co | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £11,780 |
| Jaflong Restaurant | | | tax violations | 2018 | UK-HMRC | £12,860 |
| Jain Europe Ltd | | | tax violations | 2017 | UK-HMRC | £13,879 |
| Jamber Construction Limited | | | tax violations | 2022 | UK-HMRC | £49,924 |
| Jamber Managment Limited | | | tax violations | 2022 | UK-HMRC | £96,093 |
| James Alexander Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| James Anderson & Co Limited | | | accounting fraud or deficiencies | 2016 | UK-ICAS | £1,000 |
| James Ashley Commercial Property Consultants LLP EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,300 |
| James Hope Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,350 |
| James Pye & Son Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £7,000 |
| James Sharp and Company | | | investor protection violation | 2012 | UK-FSA | £49,000 |
| Jameson And Partners Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,470 |
| Jamie Warner Estate Agents LTD EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| Janice Chissick Estates Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £11,696 |
| Jark-1 Limited | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| Jasmine Thai Cuisine Ltd | | | tax violations | 2021 | UK-HMRC | £57,385 |
| Jaymax Uniform Shop Ltd | | | tax violations | 2023 | UK-HMRC | £34,071 |
| JB Foods (Yorkshire) Limited | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £0 |
| JBK Constructions Ltd | | | tax violations | 2024 | UK-HMRC | £3,319,617 |
| JBS Decorating & Maintenance Services | | | tax violations | 2017 | UK-HMRC | £33,919 |
| JCM Residential Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,700 |
| JDG Electrical Services | | | tax violations | 2019 | UK-HMRC | £20,073 |
| JDM Metals | | | tax violations | 2022 | UK-HMRC | £19,865 |
| JDR Commercial Solutions NI Limited | | | tax violations | 2023 | UK-HMRC | £1,156,778 |
| Jedirect Corp | | | tax violations | 2021 | UK-HMRC | £3,740,541 |
| Jeffrey Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £13,100 |
| Jeffrey Ross Ltd. | | | anti-money-laundering deficiencies | 2014 | UK-OFT | £29,000 |
| Jenics Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,800 |
| Jenkinson Estates Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Jennifer Lauren Gallery Limited AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,300 |
| Jenny Laurence Limited | | | tax violations | 2023 | UK-HMRC | £29,872 |
| Jervis & Partners Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,000 |
| Jess Simpson Ltd | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £6,300 |
| Jess Wilder Fine Art AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,500 |
| Jethwa Supermarkets Ltd franchise of Costcutter | | | tax violations | 2018 | UK-HMRC | £64,092 |
| Jewellery Hub of London Ltd | | | anti-money-laundering deficiencies | 2019 | UK-HMRC | £500 |
| JH Chen 33 Ltd dba Peking Garden | | | tax violations | 2020 | UK-HMRC | £15,915 |
| Jhinda Sher Gill Construction Ltd | | | tax violations | 2018 | UK-HMRC | £66,773 |
| Jimmers of Dunlop Limited | | | tax violations | 2022 | UK-HMRC | £45,817 |
| Jinks Aston Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,550 |
| JJ Accounts And Bookkeeping Services Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| JJB Sports plc | | | investor protection violation | 2011 | UK-FSA | £455,000 |
| JKL (Wakefield) Ltd | | | tax violations | 2019 | UK-HMRC | £16,432,386 |
| JLT Specialty Limited | Marsh & McLennan | financial services | anti-money-laundering deficiencies | 2022 | UK-FCA | £7,881,700 |
| JMB Investments Limited | | | tax violations | 2023 | UK-HMRC | £88,291 |
| JMJ and Associates Ltd ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| JMS Estate Agents Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Joanna's Fish Bar | | | tax violations | 2018 | UK-HMRC | £29,550 |
| Joes Burgers Ltd fka Buba Joe’s | | | tax violations | 2024 | UK-HMRC | £30,606 |
| Jofzaj Limited dba The Mogul | | | tax violations | 2016 | UK-HMRC | £28,434 |
| John A Hyde & Co Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £1,750 |
| John Buck Property Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,700 |
| John Joseph Financial Services Limited | | | investor protection violation | 2015 | UK-FCA | £20,000 |
| John Pye & Sons Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,500 |
| Johnson Print Ltd | | | tax violations | 2022 | UK-HMRC | £27,355 |
| Johnsons | | | tax violations | 2017 | UK-HMRC | £38,105 |
| Jon Essam & Co Ltd | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £1,602 |
| Jonah Ltd ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,500 |
| Jones Boyd (Durham) Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £1,000 |
| Jones Motor Engineers and ABS Computers | | | tax violations | 2017 | UK-HMRC | £44,388 |
| Joseph Meer Ltd | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £3,586 |
| JP Accounts And Bookkeeping Ltd ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,450 |
| JPK Solutions Ltd | | | tax violations | 2018 | UK-HMRC | £16,634 |
| JPMorgan Chase Bank N.A. | JPMorgan Chase | financial services | investor protection violation | 2013 | UK-FCA | £137,610,000 |
| JR Painting and Decorating | | | tax violations | 2023 | UK-HMRC | £19,886 |
| JSP Accountants Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £5,000 |
| Julian Francis Logistics Ltd | | | tax violations | 2023 | UK-HMRC | £65,145 |
| Julius Baer International Limited | Julius Baer Group | financial services | investor protection violation | 2022 | UK-FCA | £18,022,500 |
| Jumpin Sussex Ltd | | | tax violations | 2021 | UK-HMRC | £22,839 |
| Junny Ltd dba Lau's Buffet | | | tax violations | 2018 | UK-HMRC | £78,320 |
