| CMS Metals Ltd | | | tax violations | 2017 | UK-HMRC | £5,774,265 |
| CMHDMX | | | tax violations | 2020 | UK-HMRC | £29,939 |
| Clydesdale Bank plc | Virgin Money UK PLC | financial services | banking violation | 2021 | UK-CMA | £0 |
| Club Spice | | | tax violations | 2023 | UK-HMRC | £22,103 |
| Cloud Genie Ltd | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £5,068 |
| Close Investments Limited | Close Brothers Group PLC | financial services | investor protection violation | 2010 | UK-FSA | £98,000 |
| Clive Owen LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £32,060 |
| Clive Owen LLP | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £23,048 |
| Clicklettings Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £14,500 |
| Clearwater Properties | | | tax violations | 2017 | UK-HMRC | £35,259 |
| Clear Vision Accountancy Ltd | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £10,305 |
| Clear Junction Ltd | | | economic sanction violation | 2021 | UK-OFSI | £36,393 |
| Clays Farm Gold Centre | | | tax violations | 2015 | UK-HMRC | £46,781 |
| Clarke Nicklin LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £28,000 |
| Clarke Demolition Company Limited | | | tax violations | 2021 | UK-HMRC | £78,162 |
| Clarke Cole Accounting Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,419 |
| Clark Mobility Services and Nessies Discount Furniture Store | | | tax violations | 2017 | UK-HMRC | £50,873 |
| Claremont Homes (UK) Limited | | | tax violations | 2019 | UK-HMRC | £146,418 |
| Clancy's | | | tax violations | 2022 | UK-HMRC | £17,731 |
| CJ Decorators Ltd | | | tax violations | 2018 | UK-HMRC | £44,064 |
| Cityzen Property Management Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £7,000 |
| Cityzen Property London Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,600 |
| City Wharf Apartments Ltd | | | tax violations | 2018 | UK-HMRC | £27,204 |
| City View Hotel Ltd | | | tax violations | 2018 | UK-HMRC | £12,384 |
| City Index Limited | | | investor protection violation | 2011 | UK-FSA | £490,000 |
| Citigroup Global Markets Limited, Citibank N.A. London branch and Citibank Europe Plc UK branch | Citigroup | financial services | internal controls deficiency | 2019 | UK-PRA | £43,890,000 |
| Citigroup Global Markets Limited | Citigroup | financial services | investor protection violation | 2022 | UK-FCA | £12,553,800 |
| Citified Management Services Limited | | | tax violations | 2017 | UK-HMRC | £152,480 |
| Citadel Insurance Company Limited | | | anti-money-laundering deficiencies | 2020 | UK-IOM | £2,170 |
| Circa Accountants Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,072 |
| CIM Technologies Ltd. dba Tooth Fairy Finance | | | payday lending violation | 2010 | UK-OFT | £0 |
| CIE Europe Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £1,600 |
| Christopher Thomas & Co Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Christina Nail Spa Ltd | | | tax violations | 2021 | UK-HMRC | £143,372 |
| Christchurch Investment Management Limited | | | investor protection violation | 2012 | UK-FSA | £26,600 |
| Chris Duckett Limited | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £234 |
| Chong & Associates Limited | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £0 |
| Chohan Management Limited | | | tax violations | 2022 | UK-HMRC | £61,352 |
| Chip Ahoy | | | tax violations | 2022 | UK-HMRC | £21,497 |
| Chinese New Garden Ltd | | | tax violations | 2022 | UK-HMRC | £85,543 |
| Chinese Business Gazette Ltd | | | tax violations | 2019 | UK-HMRC | £14,558 |
| China K Ltd dba China King | | | tax violations | 2018 | UK-HMRC | £47,189 |
| China Exp Ltd | | | tax violations | 2019 | UK-HMRC | £24,974 |
| China City 7 Limited | | | tax violations | 2023 | UK-HMRC | £160,486 |
| Chiddicks Homes Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,000 |
| Chicksand Gordon Avis Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £5,000 |
| Chickn Lickn Belfast Limited | | | tax violations | 2021 | UK-HMRC | £22,917 |
| CHG Holdings Ltd | | | tax violations | 2022 | UK-HMRC | £247,463 |
| Cheshire Mortgage Corporation Limited | | | mortgage abuses | 2012 | UK-FSA | £1,225,000 |
| Chennai Chutney Ltd | | | tax violations | 2018 | UK-HMRC | £17,379 |
| Cheng Du Buckingham Ltd | | | tax violations | 2018 | UK-HMRC | £24,239 |
| Cheney & Co. | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £10,000 |
| Chen Li Limited dba China Garden | | | tax violations | 2016 | UK-HMRC | £61,578 |
| Chelsea House Hotel | | | tax violations | 2018 | UK-HMRC | £16,925 |
| Chelepis Watson Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £4,162 |
| Chelepis Watson Limited | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £2,600 |
| Cheesmans | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £145,000 |
| Chawla and Gulati Property Investments Ltd | | | tax violations | 2018 | UK-HMRC | £10,666 |
| Chase de Vere Independent Financial Advisers Limited | Swiss Life Group | financial services | investor protection violation | 2014 | UK-FCA | £560,000 |
| Charterhouse (Accountants) Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £5,000 |
| Charterhouse (Accountants) Limited | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £1,000 |
| Charlotte Bradley Transport Ltd | | | tax violations | 2016 | UK-HMRC | £12,877 |
| Charlie Chans | | | tax violations | 2019 | UK-HMRC | £85,193 |
| Charlie Chans | | | tax violations | 2019 | UK-HMRC | £42,352 |
| Charlie Chan's | | | tax violations | 2018 | UK-HMRC | £69,148 |
| Charles Schwab UK Ltd. | Charles Schwab Corp. | financial services | investor protection violation | 2020 | UK-FCA | £8,963,200 |
| Charles Alexander & Co Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,000 |
| Chantrey Vellacott DFK LLP | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £41,805 |
| Chantrey Vellacott | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £3,980 |
| Changtel Solutions UK Ltd dba Enta Technologies Ltd. | | | tax violations | 2017 | UK-HMRC | £501,137 |
| Changeable Eyewear Ltd | | | tax violations | 2019 | UK-HMRC | £37,039 |
| Chandley Robinson Ltd | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £4,200 |
| Champy's Restaurant Ltd | | | tax violations | 2019 | UK-HMRC | £42,237 |
| Chameleon Consultants Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £2,850 |
| Chambers Nottm Ltd | | | tax violations | 2018 | UK-HMRC | £364,647 |
| Chai Thali Limited | | | tax violations | 2023 | UK-HMRC | £36,991 |
| Chadico Limited dba Mia Lounge | | | tax violations | 2016 | UK-HMRC | £435,129 |
| CGS Site Services Ltd | | | tax violations | 2018 | UK-HMRC | £519,814 |
| CFO For Growth Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,000 |
| Certes Capital Limited (formerly Marlborough Pension Trustees Limited) | | | investor protection violation | 2019 | UK-GFSC | £0 |
| Centurion Property Management Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| Cent Furniture Limited | | | tax violations | 2023 | UK-HMRC | £128,598 |
| Cenkos Securities Plc | | | investor protection violation | 2016 | UK-FCA | £530,500 |
| Celtic Carriers Limited | | | tax violations | 2016 | UK-HMRC | £318,408 |
| Celebrations Express Limited | | | tax violations | 2020 | UK-HMRC | £46,058 |
| Ceiling Form Ltd | | | tax violations | 2017 | UK-HMRC | £60,694 |
| Ceil Private Limited dba Ashoka Southside | | | tax violations | 2019 | UK-HMRC | £23,027 |
| Cece Cornwall Ltd dba Funky's | | | tax violations | 2019 | UK-HMRC | £32,088 |
| CCS Nationwide Limited TCSP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,657 |
| cba (Accountants) Limited | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £10,653 |
| CB Contracts | | | tax violations | 2017 | UK-HMRC | £37,412 |
| Cayenes Ltd | | | tax violations | 2023 | UK-HMRC | £74,062 |
| Cavu Corporate Finance Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £1,284 |
| Caversham Browne Limited | | | tax violations | 2017 | UK-HMRC | £17,605 |
| Caver Global Sp zoo | | | tax violations | 2022 | UK-HMRC | £14,754 |
| Cavendish & Co Estate Agents Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,938 |
| Causeway Coast Rentals Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Cattov Ltd | | | tax violations | 2023 | UK-HMRC | £57,889 |
| Cathay International Holdings Limited | | | investor protection violation | 2019 | UK-FCA | £411,000 |
| Caterpak Limited | | | tax violations | 2020 | UK-HMRC | £59,389 |
| Caterina Belluardo Ltd | | | tax violations | 2020 | UK-HMRC | £19,925 |
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