| Al Mustakillah Television Limited | | | telecommunications violation | 2013 | UK-OFCOM | £25,000 |
| Al-Fatiha Global | | | charity violation | 2020 | UK-CCEW | £0 |
| Al-Hassan Education Centre | | | charity violation | 2017 | UK-CCEW | £0 |
| Albam Limited | | | consumer protection violation | 2022 | UK-GLA | £4,000 |
| Albayan Education Foundation Limited | | | charity violation | 2022 | UK-CCEW | £0 |
| Alistar Green Legal Services Limited | | | privacy violation | 2019 | UK-ICO | £80,000 |
| Alister Pilling Solicitors | | | legal services violation | 2021 | UK-SRA | £1,400 |
| All Nations Community Centre | | | charity violation | 2020 | UK-CCEW | £0 |
| All Wales Ethnic Minority Association (AWEMA) | | | charity violation | 2016 | UK-CCEW | £0 |
| Allapplianceservices UK Ltd | | | privacy violation | 2022 | UK-ICO | £68,000 |
| Alliance and Leicester Personal Finance Limited | Banco Santander | financial services | consumer protection violation | 2010 | UK-OFT | £0 |
| Alliance Solicitors Ltd | | | legal services violation | 2023 | UK-SRA | £1,500 |
| ALM LAW LIMITED | | | legal services violation | 2020 | UK-SRA | £1,300 |
| ALM LAW LIMITED | | | legal services violation | 2022 | UK-SRA | £3,350 |
| Alpha Estates.Net Limited T/A Sutherland Estates | | | consumer protection violation | 2023 | UK-PRS | £0 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £35,000 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £5,000 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £35,000 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £10,000 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £35,000 |
| Alpha Lettings Management Ltd | | | consumer protection violation | 2022 | UK-GLA | £15,000 |
| Alpha-Telecom Limited and Excelsior International | | | telecommunications violation | 2012 | UK-PSA | £25,000 |
| Altan Capital Ltd | | | consumer protection violation | 2023 | UK-GLA | £3,353 |
| Altan Capital Ltd | | | consumer protection violation | 2023 | UK-GLA | £0 |
| Altavon Property Management Ltd | | | consumer protection violation | 2017 | UK-PRO | £0 |
| Alterna Limited | | | consumer protection violation | 2022 | UK-GLA | £6,000 |
| Alterna Limited | | | consumer protection violation | 2022 | UK-GLA | £11,000 |
| Alterna Limited | | | consumer protection violation | 2022 | UK-GLA | £8,000 |
| Alternative Housing | | | charity violation | 2020 | UK-CCEW | £0 |
| Alzheimer's UK Research Education and Care Ltd | | | charity violation | 2011 | UK-CCEW | £0 |
| Amana Lettings and Property Management Limited | | | consumer protection violation | 2023 | UK-PRS | £0 |
| Amazecell Limited | | | telecommunications violation | 2012 | UK-PSA | £300,000 |
| Amazon | Amazon.com | retailing | consumer protection violation | 2023 | UK-CMA | £0 |
| Amazon Media EU S.a.r.l. | Amazon.com | retailing | consumer protection violation | 2017 | UK-CMA | £0 |
| Amber UPVC Fabrications Limited | | | privacy violation | 2014 | UK-ICO | £50,000 |
| Amberley Estates Limited | | | consumer protection violation | 2019 | UK-PRS | £0 |
| Amectro Ltd | | | telecommunications violation | 2014 | UK-PSA | £250,000 |
| American Airlines | American Airlines | airlines | consumer protection violation | 2017 | UK-CAA | £0 |
| American Express Services Europe Limited | American Express | financial services | privacy violation | 2021 | UK-ICO | £90,000 |
| American Express Services Europe Limited | American Express | financial services | consumer protection violation | 2010 | UK-OFT | £0 |
| Amigo Loans Ltd | | | consumer protection violation | 2023 | UK-FCA | £0 |
| Amos Estate Agents Ltd | | | consumer protection violation | 2022 | UK-PRS | £0 |
| Ampay Ltd | | | telecommunications violation | 2024 | UK-OFCOM | £0 |
| AMS Marketing Limited | | | privacy violation | 2018 | UK-ICO | £100,000 |
| AMT Lawyers Ltd | | | legal services violation | 2020 | UK-SRA | £300 |
| Amy Marion Dwyer Will Trust | | | charity violation | 2014 | UK-CCEW | £0 |
| Anatolia People's Cultural Centre | | | charity violation | 2018 | UK-CCEW | £0 |
| Anaya Aid | | | charity violation | 2020 | UK-CCEW | £0 |
| ANB Law | | | legal services violation | 2021 | UK-SRA | £1,300 |
| Anchor Hanover | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £3,500 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £1,800 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £100 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £150 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £150 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £2,400 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £200 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £200 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £200 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £200 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £200 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £250 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £300 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £325 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £400 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £450 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £50 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £50 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £50 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £50 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2020 | UK-HOS | £75 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2021 | UK-HOS | £75 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2022 | UK-HOS | £750 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £955 |
| Anchor Hanover Group | Anchor Hanover Group | miscellaneous services | consumer protection violation | 2023 | UK-HOS | £100 |
| Anchor Properties London Ltd | | | consumer protection violation | 2019 | UK-PRS | £0 |
| Andrew Hayward Property Services Limited | | | consumer protection violation | 2015 | UK-PRS | £0 |
| Aneurin Bevan Health Board | | | privacy violation | 2012 | UK-ICO | £70,000 |
| Angel Wilkins LLP | | | legal services violation | 2023 | UK-SRA | £8,500 |
| Angels Property Lettings | | | consumer protection violation | 2023 | UK-GLA | £1,250 |
| Anglia Accommodation Services | | | consumer protection violation | 2021 | UK-PRS | £0 |
| Anglian Water | Anglian Water Group Limited | utilities and power generation | consumer protection violation | 2023 | UK-OFWAT | £0 |
| ANO | | | charity violation | 2020 | UK-CCEW | £0 |
| ANO TV Novosti | | | telecommunications violation | 2022 | UK-OFCOM | £0 |
| ANO TV Novosti | | | telecommunications violation | 2019 | UK-OFCOM | £200,000 |
| Anthony Hamilton Estate Agents Ltd | | | consumer protection violation | 2018 | UK-PRS | £0 |
| Antiphony Limited | | | telecommunications violation | 2010 | UK-PSA | £75,000 |
| Apex Assure Limited | | | privacy violation | 2022 | UK-ICO | £184,000 |
| Apna Ghar Housing Association Limited | | | consumer protection violation | 2021 | UK-HOS | £200 |
| Apna Ghar Housing Association Limited | | | consumer protection violation | 2021 | UK-HOS | £250 |
| Apple Distribution International | | | consumer protection violation | 2017 | UK-CMA | £0 |
| Apple Inc. | Apple Inc. | electrical and electronic equipment | consumer protection violation | 2019 | UK-CMA | £0 |
| Approved Green Energy Solutions | | | privacy violation | 2018 | UK-ICO | £150,000 |
| Aquila Property Capitals ltd | | | consumer protection violation | 2020 | UK-PRS | £0 |
| Archstone Residential Ltd | | | consumer protection violation | 2022 | UK-PRS | £0 |
| Archstone Solicitors Ltd | | | legal services violation | 2021 | UK-SRA | £1,400 |
| Archstone Solicitors Ltd | | | legal services violation | 2023 | UK-SRA | £2,200 |
