| Contractors 4 U Limited | | | tax violations | 2016 | UK-HMRC | £16,090 |
| Cookson Contracts Limited | | | tax violations | 2016 | UK-HMRC | £30,850 |
| Copeland Residential Sales Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £7,000 |
| Copiers (UK) Ltd | | | tax violations | 2017 | UK-HMRC | £41,532 |
| Corestore Ltd | | | tax violations | 2023 | UK-HMRC | £514,039 |
| Cornerstone Crew Management (M.I.) Limited | | | anti-money-laundering deficiencies | 2023 | UK-IOM | £9,659 |
| Correia Limited dba Il Castello | | | tax violations | 2019 | UK-HMRC | £85,477 |
| Corserve Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £2,750 |
| Cosmeticity Limited | | | tax violations | 2023 | UK-HMRC | £48,921 |
| Costcutter Salford Ltd | | | tax violations | 2018 | UK-HMRC | £46,144 |
| Cotswold Accountancy Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,500 |
| Cottage Balti | | | tax violations | 2022 | UK-HMRC | £15,997 |
| Cottage Balti | | | tax violations | 2022 | UK-HMRC | £14,054 |
| Cotton Design Ltd | | | tax violations | 2021 | UK-HMRC | £779,691 |
| Coulogne Logistics Services | | | tax violations | 2021 | UK-HMRC | £18,454 |
| Count On Me Accountant Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,000 |
| Countrrywide Ltd | | | tax violations | 2023 | UK-HMRC | £210,565 |
| Countrywide Estate Agents | | | anti-money-laundering deficiencies | 2018 | UK-HMRC | £215,000 |
| Coutts & Company | NatWest Group PLC | financial services | anti-money-laundering deficiencies | 2012 | UK-FSA | £8,750,000 |
| Coutts & Company | NatWest Group PLC | financial services | investor protection violation | 2011 | UK-FSA | £6,300,000 |
| Cowgill Holloway LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £14,000 |
| Cox Costello & Horne Limited | | | accounting fraud or deficiencies | 2014 | UK-ICAEW | £20,380 |
| CPL Foods Ltd | | | tax violations | 2017 | UK-HMRC | £42,532 |
| CR Building Services | | | tax violations | 2016 | UK-HMRC | £41,277 |
| CR Plastering Services | | | tax violations | 2023 | UK-HMRC | £18,319 |
| Cracherchlo Ltd | | | tax violations | 2019 | UK-HMRC | £38,894 |
| Cranleys Partnership LLP | | | accounting fraud or deficiencies | 2016 | UK-ICAEW | £11,567 |
| Creaseys Group Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £9,219 |
| Creaseys Group Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £10,000 |
| Creaseys Group Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £3,500 |
| Creaseys LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £18,363 |
| Creaseys LLP | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £137,180 |
| Credit Suisse | UBS | financial services | banking violation | 2021 | UK-FCA | £292,209,276 |
| Credit Suisse (UK) Limited | UBS | financial services | investor protection violation | 2011 | UK-FSA | £5,950,000 |
| Credit Suisse International | UBS | financial services | investor protection violation | 2014 | UK-FCA | £2,398,100 |
| Credit Suisse International and Credit Suisse Securities (Europe) Ltd | UBS | financial services | internal controls deficiency | 2023 | UK-PRA | £87,082,000 |
| Credit Suisse Securities (Europe) Limited et al. | UBS | financial services | investor protection violation | 2010 | UK-FSA | £1,750,000 |
| Creditcard Optimisation Ltd | | | tax violations | 2022 | UK-HMRC | £181,028 |
| Crescendo Advisors International Limited | | | anti-money-laundering deficiencies | 2022 | UK-GFSC | £203,000 |
| Cricket Fine Art Limited AMP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £10,000 |
| Cricket Hill Financial Planning Limited | | | investor protection violation | 2011 | UK-FSA | £70,000 |
| Critchleys Probate Services LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £500 |
| Criteria Wealth Management Limited | | | investor protection violation | 2020 | UK-GFSC | £0 |
| Crossley & Davis | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £1,050 |
| Crossley & Davis | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £6,992 |
| Crosstube Rail Limited | | | tax violations | 2018 | UK-HMRC | £262,709 |
| Crowe U.K. LLP | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £0 |
| Crowe U.K. LLP | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £18,317 |
| Crowe U.K. LLP | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £24,492 |
| Crowe U.K. LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £20,155 |
| Crowntree Investments Ltd | | | tax violations | 2017 | UK-HMRC | £48,220 |
| Crowthers Construction Limited | | | tax violations | 2023 | UK-HMRC | £41,019 |
| Crystal Trading Limited dba Pink Turban | | | tax violations | 2017 | UK-HMRC | £24,987 |
| CSC | | | tax violations | 2016 | UK-HMRC | £102,514 |
| CSMS Property Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,100 |
| CSPD Limited | | | tax violations | 2016 | UK-HMRC | £46,146 |
| CTA Consultants Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £13,000 |
| Cube3 Solutions Limited | | | accounting fraud or deficiencies | 2020 | UK-ICAEW | £525 |
| Cumbrian Quest Ltd | | | tax violations | 2016 | UK-HMRC | £24,744 |
| Cumin Spice Ltd dba Viceroy | | | tax violations | 2018 | UK-HMRC | £27,330 |
| Cummings Civils Ltd | | | tax violations | 2021 | UK-HMRC | £127,518 |
| Curley Transport Ltd | | | tax violations | 2016 | UK-HMRC | £49,906 |
| Currie Accountancy Limited | | | accounting fraud or deficiencies | 2018 | UK-ICAEW | £5,000 |
| Currie Accountancy Limited | | | accounting fraud or deficiencies | 2022 | UK-ICAEW | £1,680 |
| Curtis Groundworks | | | tax violations | 2023 | UK-HMRC | £50,553 |
| Cut 'N' Cover Limited | | | tax violations | 2020 | UK-HMRC | £47,458 |
| CWJ Developments Ltd | | | tax violations | 2019 | UK-HMRC | £101,972 |
| D & J Randles Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,009 |
| D & L Platinum (NI) Ltd dba The Stables dba Gordons Wine Bar | | | tax violations | 2017 | UK-HMRC | £64,029 |
| D C Advance Ltd | | | tax violations | 2020 | UK-HMRC | £43,205 |
| D Chicken Ltd | | | tax violations | 2019 | UK-HMRC | £98,514 |
| D J Murphey Construction Ltd | | | tax violations | 2021 | UK-HMRC | £86,625 |
| D J Oliver Property Services Ltd. | | | tax violations | 2016 | UK-HMRC | £100,341 |
| D K Gill Ltd franchise of Bargain Booze and Premier | | | tax violations | 2017 | UK-HMRC | £39,241 |
| D L Roofing | | | tax violations | 2023 | UK-HMRC | £43,427 |
| D M Cameron and Co Ltd | | | tax violations | 2019 | UK-HMRC | £30,786 |
| D M Labour Services Ltd | | | tax violations | 2019 | UK-HMRC | £64,099 |
| D S Churchill Country Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £10,000 |
| D Wall Transport | | | tax violations | 2016 | UK-HMRC | £69,295 |
| D&I Decorator Ltd | | | tax violations | 2023 | UK-HMRC | £39,054 |
| D-Accounting Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,482 |
| D.C. Evans | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £1,050 |
| D.I.J Real Estate Ltd EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,350 |
| D.M. Weldon & Sons Limited | | | tax violations | 2017 | UK-HMRC | £39,530 |
| Da Remo Restaurants Limited | | | tax violations | 2019 | UK-HMRC | £24,280 |
| Da Vinci Invest Limited | | | investor protection violation | 2015 | UK-FCA | £1,460,000 |
| Daft 4 Art 'N' Crafts Ltd | | | tax violations | 2022 | UK-HMRC | £43,734 |
| Daily Drinks 007 Ltd | | | tax violations | 2023 | UK-HMRC | £157,761 |
| Dains LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £77,572 |
| Dains LLP | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £13,500 |
| Daniela Construction Ltd | | | tax violations | 2023 | UK-HMRC | £91,770 |
| Danske Bank | Danske Bank | financial services | banking violation | 2021 | UK-CMA | £0 |
| Danske Bank | Danske Bank | financial services | banking violation | 2021 | UK-CMA | £0 |
| Dante’s | | | tax violations | 2023 | UK-HMRC | £53,035 |
| Dartford Metal Works Ltd | | | tax violations | 2019 | UK-HMRC | £14,467 |
| Dashi Cuisine Ltd Lychee Oriental | | | tax violations | 2022 | UK-HMRC | £151,165 |
| Data Lake Limited (Formerly Hello Soda Asia Limited) | | | tax violations | 2019 | UK-HMRC | £66,835 |
| Data Market Group Ltd | | | tax violations | 2019 | UK-HMRC | £531,004 |
| Data People (Staffing) Ltd dba Out Staff Ltd. | | | tax violations | 2017 | UK-HMRC | £169,877 |
| Dauti Accounting Services Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,500 |
| Davenport Hodgkiss | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £700 |
