| 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 |
| Argun 20 Ltd dba Hayat | | | tax violations | 2023 | UK-HMRC | £28,328 |
| 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 & 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Australian Wines | | | tax violations | 2020 | UK-HMRC | £24,906 |
| Auto George Ltd formerly trading as George’s Autos | | | tax violations | 2023 | UK-HMRC | £25,900 |
| 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 |
| AWA Contractors Ltd | | | tax violations | 2019 | UK-HMRC | £239,102 |
| AWM Accountant and Tax Advisors | | | tax violations | 2019 | UK-HMRC | £244,445 |
| AXA Wealth Services Ltd | Phoenix Group Holdings PLC | financial services | investor protection violation | 2013 | UK-FCA | £1,802,200 |
| Axehayes Farm | | | tax violations | 2021 | UK-HMRC | £11,085 |
| Axia Computer Systems Ltd | | | tax violations | 2018 | UK-HMRC | £48,877 |
| Ayana & Co Ltd dba Purbani Netley | | | tax violations | 2019 | UK-HMRC | £122,149 |
| Aygo Limited dba Top Grill Kebab & Pizza House | | | tax violations | 2019 | UK-HMRC | £27,909 |
| Ayr Estate & Letting Agents Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,516 |
| Azets Audit Services Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £9,750 |
| Azets Audit Services Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £5,048 |
| Azets Audit Services Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £10,500 |
| Azets Holdings Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £2,100 |
| Azets Holdings Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £10,500 |
| Azure Grand Limited formerly trading as Life Glasgow | | | tax violations | 2023 | UK-HMRC | £416,139 |
| B Bostan Building Contractors Limited | | | tax violations | 2016 | UK-HMRC | £75,435 |
| B J Mistry & Co | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £1,050 |
| B J Plant & Sons | | | tax violations | 2016 | UK-HMRC | £22,240 |
| B R Siggins Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £6,500 |
| B&B Convenience Stores Ltd dba Kwik Stop Convenience Store | | | tax violations | 2022 | UK-HMRC | £231,073 |
| B.H. Accountancy Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £2,289 |
| B1 Tyres | | | tax violations | 2021 | UK-HMRC | £29,146 |
| Badgemoor Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £12,784 |
| Badger Stores Ltd dba Brothers News | | | tax violations | 2021 | UK-HMRC | £22,254 |
| Baharmordan Ltd dba Mint Leaf Indian Brasserie | | | tax violations | 2019 | UK-HMRC | £76,096 |
| Baird Consulting Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £8,763 |
| Bairstow & Atkinson | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,500 |
| Bajaj & Company | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £1,120 |
| Bakaal Worldwide Ltd | | | anti-money-laundering deficiencies | 2019 | UK-HMRC | £500 |
| Bakeland Construction Ltd | | | tax violations | 2017 | UK-HMRC | £13,090 |
| Baker Tilly UK Audit LLP | RSM Group | business services | accounting fraud or deficiencies | 2019 | UK-FRC | £750,000 |
| Bakus (UK) Ltd | | | tax violations | 2019 | UK-HMRC | £53,870 |
| Ballards Wok Limited | | | tax violations | 2019 | UK-HMRC | £91,558 |
| Ballyards Ltd | | | tax violations | 2020 | UK-HMRC | £19,955 |
| Balmoral Accountancy Services (NE) Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £500 |
| Balti International Ltd | | | tax violations | 2021 | UK-HMRC | £173,929 |
| Bampton Satchwell Bull Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £28,600 |
| Bando Boxes Ltd. | | | tax violations | 2022 | UK-HMRC | £28,770 |
| Bangla Bazar 2 Ltd | | | tax violations | 2022 | UK-HMRC | £47,230 |
| Bangla Lounge (Hall Green) | | | tax violations | 2018 | UK-HMRC | £23,515 |
| Bangley Quarry Biogas Ltd | | | tax violations | 2023 | UK-HMRC | £187,625 |
| Bank of Beirut (UK) Ltd | | | anti-money-laundering deficiencies | 2015 | UK-FCA | £2,100,000 |
