| Jaffer & Co | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £11,780 |
| JAD Transport | | | tax violations | 2016 | UK-HMRC | £57,381 |
| Jackson Grundy Limited | | | anti-money-laundering deficiencies | 2014 | UK-OFT | £169,652 |
| J.P.Logan Construction Plant Hire and Sales | | | tax violations | 2023 | UK-HMRC | £23,036 |
| J.P. Morgan Securities Ltd. | JPMorgan Chase | financial services | investor protection violation | 2010 | UK-FSA | £33,320,000 |
| J.P. Morgan International Bank Limited | JPMorgan Chase | financial services | investor protection violation | 2013 | UK-FCA | £3,076,200 |
| J Weekday Limited dba Jade Dragon House | | | tax violations | 2018 | UK-HMRC | £25,463 |
| J W Walsh Accountants 2018 Ltd | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £2,000 |
| J W Hinks LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £2,100 |
| J R & M McGinty ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| J P Walters & Co Ltd | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £5,000 |
| J P Products (Kidderminster) Ltd | | | tax violations | 2019 | UK-HMRC | £225,267 |
| J O Lindsay Contractors (UK) Limited | | | tax violations | 2023 | UK-HMRC | £21,961 |
| J M Construction (Leeds) Limited | | | tax violations | 2018 | UK-HMRC | £13,976 |
| J Ketley Services | | | tax violations | 2022 | UK-HMRC | £11,906 |
| J J Timisoreana Ltd | | | tax violations | 2019 | UK-HMRC | £61,411 |
| J H Greenwood FCA | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £323 |
| J G Projects | | | tax violations | 2018 | UK-HMRC | £21,936 |
| J Ahmed & Co Limited | | | anti-money-laundering deficiencies | 2021 | UK-ICAEW | £2,100 |
| J & AR London Limited AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,350 |
| IZ Solutions Limited | | | tax violations | 2024 | UK-HMRC | £50,685 |
| Iwaan Property Management Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Ivers Investments Limited fka Sheridan Gillis Investment Holdings Limited. | | | tax violations | 2022 | UK-HMRC | £127,875 |
| ITL Motor Group Ltd | | | tax violations | 2023 | UK-HMRC | £21,767 |
| Italia Food &Wain Ltd | | | tax violations | 2023 | UK-HMRC | £27,838 |
| ISupply Drivers Limited | | | tax violations | 2023 | UK-HMRC | £179,231 |
| Istanbul Kebabs | | | tax violations | 2023 | UK-HMRC | £32,171 |
| Istanbul Grill Limited | | | tax violations | 2017 | UK-HMRC | £241,100 |
| Isle of Man Insurance Management Limited | | | anti-money-laundering deficiencies | 2020 | UK-IOM | £7,770 |
| Isle of Man Assurance Limited | | | anti-money-laundering deficiencies | 2020 | UK-IOM | £87,108 |
| Island Homes Kent Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,500 |
| Island Financial Solutions Limited | | | investor protection violation | 2020 | UK-IOM | £62,996 |
| Ishan Logistics Limited | | | tax violations | 2017 | UK-HMRC | £26,950 |
| Isarn Ltd | | | tax violations | 2019 | UK-HMRC | £19,921 |
| Irlam Commercials Limited | | | tax violations | 2017 | UK-HMRC | £24,774 |
| Irfan Ltd | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £524,000 |
| Iqbal Financial Accountants ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,210 |
| IQ EQ (Jersey) Limited | | | banking violation | 2022 | UK-JFSC | £803,661 |
| IQ Direct Ltd | | | tax violations | 2024 | UK-HMRC | £34,222 |
| IPS Estate Agents Limited | | | anti-money-laundering deficiencies | 2013 | UK-OFT | £11,844 |
| IProperty Finders Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £7,000 |
| IPI Build Ltd | | | tax violations | 2023 | UK-HMRC | £52,700 |
| Investment Recovery Services Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £11,250 |
| Invesco Asset Management Limited and Invesco Fund Managers Limited | Invesco | financial services | investor protection violation | 2014 | UK-FCA | £18,643,000 |
| International Carrier Services Limited | | | tax violations | 2016 | UK-HMRC | £20,118 |
| Interlink Scaffolding Limited | | | tax violations | 2017 | UK-HMRC | £116,730 |
| Interactive Brokers (UK) | Interactive Brokers Group | financial services | investor protection violation | 2018 | UK-FCA | £1,049,412 |
| Interactive Asset Management Ltd dba Interactive Business Technology Limited | | | tax violations | 2019 | UK-HMRC | £70,008 |
| Integrated Financial Arrangements plc | IntegraFin Holdings PLC | financial services | investor protection violation | 2011 | UK-FSA | £3,500,000 |
| Integral Relocation Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,750 |
| Integra Solicitors Limited | | | anti-money-laundering deficiencies | 2023 | UK-SRA | £10,760 |
| Integra Corporate Finance Limited | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £32,250 |
| Instinet Europe Limited | Nomura | financial services | investor protection violation | 2010 | UK-FSA | £1,050,000 |
| Inspiron Networks Ltd | | | tax violations | 2023 | UK-HMRC | £301,105 |
| Inspire UK Property Investment Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,500 |
| Inspirational Financial Management Ltd | | | investor protection violation | 2024 | UK-FCA | £897,840 |
| Inspection & Technical Services Ltd | | | tax violations | 2022 | UK-HMRC | £47,383 |
| Insignia Properties Ltd | | | tax violations | 2018 | UK-HMRC | £36,299 |
| Insight Accountancy Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Innov8 Assistance Ltd | | | tax violations | 2018 | UK-HMRC | £42,827 |
| Inlair Easybuy Property Management Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,250 |
| Ingleby Homes Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,250 |
| Indus Telecom Ltd | | | tax violations | 2021 | UK-HMRC | £23,266 |
| Indigo Property Search Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,850 |
| Indian Style Ltd | | | tax violations | 2018 | UK-HMRC | £30,473 |
| Indian Ocean | | | tax violations | 2023 | UK-HMRC | £14,936 |
| Indian Garden Gloucs. Ltd | | | tax violations | 2023 | UK-HMRC | £21,391 |
| Indiaah Ltd | | | tax violations | 2019 | UK-HMRC | £30,030 |
| Inbrella Limited | | | tax violations | 2021 | UK-HMRC | £14,977 |
| Inacio Limited dba Costa Del Sol | | | tax violations | 2018 | UK-HMRC | £23,895 |
| In Vogue Floral Design | | | tax violations | 2018 | UK-HMRC | £25,666 |
| IMW Estate Agents EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £13,400 |
| Impulse & Response Ltd | | | tax violations | 2018 | UK-HMRC | £37,861 |
| Improve It T/A Peter Dickens On Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| Imperial Home and Garden | | | tax violations | 2021 | UK-HMRC | £49,591 |
| Imperial Construction Recruitment Ltd | | | tax violations | 2019 | UK-HMRC | £93,297 |
| Impact Sports Management Ltd | | | tax violations | 2017 | UK-HMRC | £177,119 |
| Imoveproperty Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Imhotep Diagnostics & Therapeutics Ltd. fka Imhotep Diagnostics Ltd | | | tax violations | 2019 | UK-HMRC | £34,459 |
| Ilpepenero Ltd | | | tax violations | 2018 | UK-HMRC | £43,820 |
| Illumidata Ltd | | | tax violations | 2017 | UK-HMRC | £35,557 |
| Iliffe Poulter Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £447 |
| IJPS Installations Limited | | | tax violations | 2016 | UK-HMRC | £16,989 |
| Igen Distribution Limited dba Hashim Banners Limited. | | | tax violations | 2021 | UK-HMRC | £65,153 |
| Iffy’s Food Limited | | | tax violations | 2023 | UK-HMRC | £12,627 |
| Iceman Ltd dba Cane Direct | | | tax violations | 2018 | UK-HMRC | £19,064 |
| ICD Electrical Ltd | | | tax violations | 2019 | UK-HMRC | £213,505 |
| I.D. Construction | | | tax violations | 2016 | UK-HMRC | £59,955 |
| I Hami Creative Company Limited | | | tax violations | 2018 | UK-HMRC | £5,219,425 |
| I D Foods Ltd dba Pepinos Pizza | | | tax violations | 2022 | UK-HMRC | £39,343 |
| Hythe Securities Limited | | | investor protection violation | 2010 | UK-FSA | £200,000 |
| Hyde Business Consulting Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,250 |
| Hybrid (Grimsby) Limited | | | tax violations | 2016 | UK-HMRC | £19,877 |
| HW Fisher LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £1,153 |
| HW Fisher | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £69,928 |
| HVS London Ltd | | | tax violations | 2018 | UK-HMRC | £86,985 |
| Huzeifa Hardware & DIY | | | tax violations | 2019 | UK-HMRC | £33,451 |
| Hutton Real Estate Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,800 |
| Hurst Accountants Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £5,250 |
| Hunter & Hunter (UK) Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,766 |
| Humphrey & Co | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £7,661 |
