| Ahmed Estates (UK) Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £5,500 |
| AIB Group (UK) plc | Allied Irish Banks | financial services | banking violation | 2020 | UK-CMA | £0 |
| AIB Group (UK) plc dba First Trust Bank | Allied Irish Banks | financial services | banking violation | 2014 | UK-CMA | £0 |
| Ainleys Accountants Limited ASP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,500 |
| Airbles Fuelling Services Ltd | | | tax violations | 2021 | UK-HMRC | £21,796 |
| Aircall International Ltd | | | tax violations | 2018 | UK-HMRC | £1,760,747 |
| Airefibre Direct Ltd | | | tax violations | 2018 | UK-HMRC | £462,790 |
| Airlink Compressors | | | tax violations | 2016 | UK-HMRC | £38,624 |
| Aitch London Limited | | | tax violations | 2016 | UK-HMRC | £58,452 |
| Ajesh Superstores Ltd dba Select Express | | | tax violations | 2022 | UK-HMRC | £13,838 |
| AJP Corporate Accountants Ltd | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £3,000 |
| AK Accounting & Financial Management Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,704 |
| AK Construction Limited | | | tax violations | 2023 | UK-HMRC | £30,316 |
| Akal Nation Limited | | | tax violations | 2022 | UK-HMRC | £220,049 |
| AKM Trading Services Ltd | | | tax violations | 2021 | UK-HMRC | £12,342 |
| Aksaray Kebabs Limited | | | tax violations | 2021 | UK-HMRC | £108,184 |
| Akshay Contracts Ltd | | | tax violations | 2020 | UK-HMRC | £19,339 |
| Al Pacino Import and Export Limited | | | tax violations | 2017 | UK-HMRC | £831,269 |
| Al Rayan Bank PLC | | | anti-money-laundering deficiencies | 2023 | UK-FCA | £4,023,600 |
| Al Safina Limited (Formerly trading as ‘Sky Fries’) | | | tax violations | 2023 | UK-HMRC | £17,521 |
| Al-Ummah Halal Poultry Limited | | | tax violations | 2020 | UK-HMRC | £228,531 |
| Alan Waggott Haulage | | | tax violations | 2023 | UK-HMRC | £26,555 |
| Albert Spratt Construction | | | tax violations | 2019 | UK-HMRC | £455,854 |
| Aldeia Limited | | | tax violations | 2018 | UK-HMRC | £39,818 |
| Alex Construction Ltd | | | tax violations | 2022 | UK-HMRC | £39,526 |
| Alex Harvey Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £13,700 |
| Alexander & Co | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £7,808 |
| Alexander Charles and Browne Ltd Estate Agency Business | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £0 |
| Alexandra Foods Limited dba Tureen | | | tax violations | 2023 | UK-HMRC | £34,764 |
| Algorbet Limited. Formerly known as Aurora Contracts Limited. | | | tax violations | 2022 | UK-HMRC | £447,889 |
| Alhilal Trading Limited | | | tax violations | 2018 | UK-HMRC | £221,702 |
| Ali Baba Pizza | | | tax violations | 2023 | UK-HMRC | £27,716 |
| Ali Superstore (uk) Ltd | | | tax violations | 2018 | UK-HMRC | £26,957 |
| Alistair's Home Bakery | | | tax violations | 2016 | UK-HMRC | £66,535 |
| Alizai Exchange Ltd | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| All Star Films Limited | | | tax violations | 2018 | UK-HMRC | £30,134 |
| Allan Desmond Limited | | | tax violations | 2016 | UK-HMRC | £66,560 |
| Allan George Consultants | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £700 |
| AllBright Cleaning Services | | | tax violations | 2022 | UK-HMRC | £37,888 |
| Alliotts | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,500 |
| Alliotts | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £39,280 |
| Alliotts LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £1,750 |
| Allsopp Contemporary Art Limited AMP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £11,962 |
| Alltwen Building & Maintenance Ltd | | | tax violations | 2021 | UK-HMRC | £10,129 |
| Allyan Ltd dba Canton Cuisine | | | tax violations | 2019 | UK-HMRC | £249,339 |
| Almus Trans | | | tax violations | 2021 | UK-HMRC | £11,958 |
| Almyra Consultants Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £7,500 |
| ALP Scaffolding Services Limited | | | tax violations | 2021 | UK-HMRC | £373,973 |
| Alpari (UK) Limited | | | anti-money-laundering deficiencies | 2010 | UK-FSA | £140,000 |
| Alpha P Consulting Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £3,068 |
| Alphie's Monopoly Ltd | | | tax violations | 2017 | UK-HMRC | £12,765 |
| Alpine Motorhome Ltd | | | tax violations | 2018 | UK-HMRC | £12,902 |
| Alppa Pan | | | tax violations | 2019 | UK-HMRC | £291,155 |
| Altus Oil & Gas Services Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,450 |
| Aluminium Recycling (UK) Ltd | | | tax violations | 2016 | UK-HMRC | £578,497 |
| Alun Evans | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £2,024 |
| Alxas Limited dba Millards Fish & Chips | | | tax violations | 2018 | UK-HMRC | £25,554 |
| AM Business and Accountancy Services Ltd | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £560 |
| AM-PM Accounting Solutions Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £500 |
| Amalgemated Asphalt & Roofing Ltd | | | tax violations | 2018 | UK-HMRC | £60,203 |
| Amans (Bramhall) Ltd dba Amans Resturant | | | tax violations | 2019 | UK-HMRC | £61,274 |
| Amazon.com Inc. | Amazon.com | retailing | investor protection violation | 2020 | UK-CMA | £55,000 |
| Amber Motor Company Ltd. Previously known as EJH2 Ltd | | | tax violations | 2020 | UK-HMRC | £2,396,285 |
| Ambridge's Fish and Chips | | | tax violations | 2019 | UK-HMRC | £110,633 |
| American Nails | | | tax violations | 2019 | UK-HMRC | £44,767 |
| Amin Exchange Limited MSB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £360,737 |
| Ammantex Ltd | | | tax violations | 2018 | UK-HMRC | £192,334 |
| Ammej Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,261 |
| Ammej Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,261 |
| Amstone Building Limited | | | tax violations | 2022 | UK-HMRC | £104,084 |
| AMT Energy Solutions | | | tax violations | 2018 | UK-HMRC | £32,912 |
| Ananthapuri Restaurant Ltd | | | tax violations | 2017 | UK-HMRC | £36,670 |
| Anderson Choice Limited | | | tax violations | 2021 | UK-HMRC | £31,739 |
| Anderson Musaamil & Co | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £500 |
| Anderson Security & Trading Limited dba Anderson Security Services | | | tax violations | 2017 | UK-HMRC | £880,365 |
| Andrew Wiggett | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £3,000 |
| Andrews & Gregg Belfast Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £12,000 |
| Andrews & Gregg North Down Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,000 |
| Andrews Accountancy Services Ltd | | | tax violations | 2020 | UK-HMRC | £15,931 |
| Andys Plastering Contractors | | | tax violations | 2022 | UK-HMRC | £28,950 |
| Angie Catering Ltd | | | tax violations | 2023 | UK-HMRC | £52,168 |
| Anglian Excavations Ltd dba East Anglian Excavations Ltd. dba Lee Brothers Earthmovers Ltd. | | | tax violations | 2017 | UK-HMRC | £16,439 |
| Annandvilla Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,773 |
| Antalya Food Express Ltd | | | tax violations | 2019 | UK-HMRC | £40,304 |
| Antara Solutions Limited | | | tax violations | 2018 | UK-HMRC | £74,043 |
| Anthony Tiscoe & Co | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £4,000 |
| Anthonys A1 Aj's Taxis | | | tax violations | 2017 | UK-HMRC | £30,822 |
| Anwar Property | | | tax violations | 2019 | UK-HMRC | £13,186 |
| Anwar Property | | | tax violations | 2019 | UK-HMRC | £12,323 |
| APC Accountancy (STAFFS) Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,558 |
| Apex All Trades Limited | | | tax violations | 2022 | UK-HMRC | £38,339 |
| Apex Food and Wine Limited | | | tax violations | 2017 | UK-HMRC | £69,923 |
| Apex Fund Services (IOM) Limited | | | anti-money-laundering deficiencies | 2018 | UK-IOM | £91,682 |
| Apparel Export Ltd | | | tax violations | 2023 | UK-HMRC | £52,252 |
| APS Accountancy and Taxation Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,447 |
| Apton Projects Limited | | | tax violations | 2019 | UK-HMRC | £20,106 |
| Aptus Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £2,500 |
| APV Solutions Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,200 |
| AQSA (UK) Ltd dba Shere Khan | | | tax violations | 2018 | UK-HMRC | £182,634 |
| Aquarius Tax Consultancy Ltd | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £2,604 |
| Arabica Ltd | | | tax violations | 2018 | UK-HMRC | £27,890 |
