| 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 |
| 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 |
| 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-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 |
| 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 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 |
| 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 |
| Arabica Ltd | | | tax violations | 2018 | UK-HMRC | £27,890 |
| ARB Property's Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,850 |
| Architectural Ceramics Ltd | | | tax violations | 2018 | UK-HMRC | £37,228 |
| Arden & Way Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,000 |
| Ardnagullion Farm Machinery Limited | | | tax violations | 2016 | UK-HMRC | £52,560 |
| Arga Resturant | | | tax violations | 2018 | UK-HMRC | £13,848 |
| Arlene's Barber Shop | | | tax violations | 2017 | UK-HMRC | £40,824 |
| Arm & Hammer Demolition Ltd dba Hicks Demolition Ltd | | | tax violations | 2018 | UK-HMRC | £140,676 |
| Armagh Food Company Limited dba Eurospar | | | tax violations | 2018 | UK-HMRC | £38,568 |
| Armstrongs Fish and Chip Shop Limited | | | tax violations | 2016 | UK-HMRC | £87,254 |
| Arnold Hill & Co LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £1,530 |
| Arrandco Audit Ltd. | | | accounting fraud or deficiencies | 2018 | UK-FRC | £790,000 |
| Arrow Logistics Ltd | | | tax violations | 2022 | UK-HMRC | £533,271 |
| Art Car Sales Ltd | | | tax violations | 2018 | UK-HMRC | £32,415 |
| Artemis Trustees Limited | | | investor protection violation | 2022 | UK-GFSC | £450,000 |
| Arwaith Cyfyngedig ASP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,550 |
| ASB Drinks Supplies Limited | | | tax violations | 2016 | UK-HMRC | £119,876 |
| Ascot Electrical Cables Ltd | | | tax violations | 2019 | UK-HMRC | £356,152 |
| ASE Audit LLP | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £4,480 |
| ASE Group Ltd. | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £2,800 |
| ASE Professional Services Ltd | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £1,750 |
| Ashan's | | | tax violations | 2016 | UK-HMRC | £35,393 |
| Ashley Cash and Carry (UK) Ltd. | | | tax violations | 2015 | UK-HMRC | £13,699 |
| Ashoka (Bridgend) Ltd dba Ashoka Tandoori Restaurant | | | tax violations | 2017 | UK-HMRC | £25,336 |
| Asia Research and Capital Management Ltd. | | | investor protection violation | 2020 | UK-FCA | £873,118 |
| Asia Resource Minerals plc fka Bumi plc | | | investor protection violation | 2015 | UK-FCA | £4,651,200 |
| Asia World Limited dba Harbour City | | | tax violations | 2017 | UK-HMRC | £92,679 |
| Ask Catering Ltd dba The Village Curry House | | | tax violations | 2019 | UK-HMRC | £83,263 |
| Aspen Waite Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £24,000 |
| Aster and Young Limited. Formerly known as SCC Trading Limited and formerly known as Centric Management Services Limited. | | | tax violations | 2022 | UK-HMRC | £9,504,557 |
| Athena & Co (Scotland) Limited | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £4,643 |
| Atkinson Donnelly LLP | | | accounting fraud or deficiencies | 2019 | UK-ICAS | £2,700 |
| Atlantic Law LLP | | | investor protection violation | 2010 | UK-FSA | £200,000 |
| Attwood & Co | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £1,000 |
| Attwood & Co | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £5,000 |
| Atwal Trading Limited dba Admirals Fish & Chips | | | tax violations | 2019 | UK-HMRC | £45,956 |
| Auker Rhodes Professional Services LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £19,930 |
| Australian Wines | | | tax violations | 2020 | UK-HMRC | £24,906 |
| Auto Partz Ltd | | | tax violations | 2015 | UK-HMRC | £42,628 |
| Automotive Solutions | | | tax violations | 2020 | UK-HMRC | £58,075 |
| Autotec Ltd | | | tax violations | 2021 | UK-HMRC | £20,867 |
| Ava Contractors Ltd | | | tax violations | 2022 | UK-HMRC | £57,237 |
| Avacade Future Solutions et al. | | | investor protection violation | 2021 | UK-FCA | £0 |
| Avacade Limited et al. | | | investor protection violation | 2021 | UK-FCA | £10,715,000 |
| Avenbrae Limited dba Cyan Restaurant | | | tax violations | 2018 | UK-HMRC | £31,060 |
| Avenue Food & Wine Stores dba Cheema's Restaurant & Bar | | | tax violations | 2016 | UK-HMRC | £20,220 |
| Aviva Investors Global Services Limited | Aviva PLC | financial services | investor protection violation | 2015 | UK-FCA | £17,607,000 |
| Aviva Pension Trustees UK Limited and Aviva Wrap UK Limited | Aviva PLC | financial services | investor protection violation | 2016 | UK-FCA | £8,246,800 |
| Avonhouse Cleaning | | | tax violations | 2016 | UK-HMRC | £10,268 |
