| 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 |
| Anderson, Brown & Clarke Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £7,000 |
| Anderton Motor Group Ltd | | | tax violations | 2024 | UK-HMRC | £38,065 |
| 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 |
| Anita Robinson Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,700 |
| Annandvilla Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,773 |
| Anne James Lettings Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,900 |
| Antalya Food Express Ltd | | | tax violations | 2019 | UK-HMRC | £40,304 |
| Antara Solutions Limited | | | tax violations | 2018 | UK-HMRC | £74,043 |
| Anthony Davies (Sales) Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| 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 |
| Ap International Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,150 |
| 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 |
| 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 |
| Arena Business Centres Ltd TCSP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £15,000 |
| Arga Resturant | | | tax violations | 2018 | UK-HMRC | £13,848 |
| Argento Wealth Ltd | | | investor protection violation | 2024 | UK-FCA | £1,600,000 |
| Argun 20 Ltd dba Hayat | | | tax violations | 2023 | UK-HMRC | £28,328 |
| Aris Property Services Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| Ark Aurora Ltd | | | accounting fraud or deficiencies | 2024 | UK-ICAEW | £1,557 |
| 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 |
| Armstrong Watson Audit Ltd | | | accounting fraud or deficiencies | 2024 | UK-ICAEW | £15,000 |
| Armstrongs Fish and Chip Shop Limited | | | tax violations | 2016 | UK-HMRC | £87,254 |
| Arnold & PHILLIPS (Chorley) Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| Arnold & Phillips (Ormskirk) Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £27,000 |
| 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 |
| Arrow Mixed Concrete Ltd | | | tax violations | 2024 | UK-HMRC | £32,897 |
| Art Car Sales Ltd | | | tax violations | 2018 | UK-HMRC | £32,415 |
| Art For Investment Ltd AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £5,700 |
| Artaria Ltd | | | tax violations | 2024 | UK-HMRC | £165,631 |
| Artemis Trustees Limited | | | investor protection violation | 2022 | UK-GFSC | £450,000 |
| Arwaith Cyfyngedig ASP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,550 |
| AS Builders Warwickshire Ltd (Formerly trading as 'AS Builders') | | | tax violations | 2023 | UK-HMRC | £67,293 |
| 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 |
| Ashfords LLP | | | anti-money-laundering deficiencies | 2023 | UK-SRA | £102,707 |
| Ashley Cash and Carry (UK) Ltd. | | | tax violations | 2015 | UK-HMRC | £13,699 |
| Ashmore Lettings & Sales Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £1,550 |
| Ashoka (Bridgend) Ltd dba Ashoka Tandoori Restaurant | | | tax violations | 2017 | UK-HMRC | £25,336 |
| Asia Delight (Northampton) Limited fka Headlands Spice | | | tax violations | 2024 | UK-HMRC | £21,750 |
| 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 |
| Asset Properties (Scotland) Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,400 |
| 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 |
| Aston Pearl Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £5,700 |
| AstraZeneca | AstraZeneca | pharmaceuticals | tax violations | 2010 | UK-HMRC | £505,000,000 |
| Atelier Rose & Gray Limited AMP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,000 |
| Athena & Co (Scotland) Limited | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £4,643 |
| Athena House Enterprise Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,250 |
| Atkinson Donnelly LLP | | | accounting fraud or deficiencies | 2019 | UK-ICAS | £2,700 |
| Atlantic Law LLP | | | investor protection violation | 2010 | UK-FSA | £200,000 |
| Atlas Cleaning Services | | | tax violations | 2023 | UK-HMRC | £21,899 |
| 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 |
| Auction House Services Ltd AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,200 |
| Audal Trading UK Ltd (formerly trading as 'Audal') | | | tax violations | 2024 | UK-HMRC | £507,986 |
| Auker Rhodes Professional Services LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £19,930 |
| Aura RB Cleaning Ltd | | | tax violations | 2023 | UK-HMRC | £31,574 |
| Auro Estates Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,900 |
| Austen-Jones Solicitors Limited | | | anti-money-laundering deficiencies | 2024 | UK-SRA | £15,202 |
| Austin Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
