| Zoya Investments Limited | | | tax violations | 2023 | UK-HMRC | £124,321 |
| Zoom995 Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Zolsha Ltd | | | tax violations | 2018 | UK-HMRC | £95,276 |
| Zobi Ltd | | | tax violations | 2022 | UK-HMRC | £89,661 |
| Zipkin Technologies Limited EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £3,200 |
| Zeta Shoes Ltd | | | tax violations | 2023 | UK-HMRC | £37,042 |
| Zest Tax Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £5,600 |
| Zero Option Rock Promotions and Z Records | | | tax violations | 2018 | UK-HMRC | £218,348 |
| Zero and Zero Ltd dba Retro | | | tax violations | 2016 | UK-HMRC | £44,321 |
| Zehd Ltd (formerly known as Zehd Caterers Limited) | | | tax violations | 2024 | UK-HMRC | £38,390 |
| Zedeye Limited dba Le Moon Restaurant | | | tax violations | 2020 | UK-HMRC | £101,674 |
| Zara Restaurant Ltd Zara Indian Cuisine | | | tax violations | 2020 | UK-HMRC | £36,257 |
| Zara Cash and Carry (Liverpool) Limited | | | tax violations | 2016 | UK-HMRC | £20,571 |
| Zamzam Enterprise Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,400 |
| Zamco Ltd | | | tax violations | 2019 | UK-HMRC | £1,736,633 |
| Zaman Roberts LLP EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Zaj Associates Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £9,000 |
| Zaike Dar Food Ltd formerly trading as Kebabish Peri Peri | | | tax violations | 2023 | UK-HMRC | £67,026 |
| Zaidi & Co | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £35,830 |
| Zabka Polski Sklep | | | tax violations | 2023 | UK-HMRC | £13,222 |
| Zaam Foreign Exchange Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £0 |
| Z & D Properties | | | tax violations | 2018 | UK-HMRC | £48,068 |
| Z & D Properties | | | tax violations | 2018 | UK-HMRC | £48,068 |
| YZ Enterprises Limited dba New China House | | | tax violations | 2016 | UK-HMRC | £61,160 |
| Yummy Yummy Takeaway Limited | | | tax violations | 2023 | UK-HMRC | £35,458 |
| Yummies Takeaway | | | tax violations | 2023 | UK-HMRC | £40,121 |
| Yummies Restaurant Ltd | | | tax violations | 2021 | UK-HMRC | £89,196 |
| YQMS Limited | | | tax violations | 2022 | UK-HMRC | £1,179,907 |
| YPO | | | accounting fraud or deficiencies | 2017 | UK-ICAEW | £1,500 |
| Yours Fashion Jewelry Ltd | | | tax violations | 2019 | UK-HMRC | £16,952 |
| Yours City Exchange Ltd | | | anti-money-laundering deficiencies | 2020 | UK-HMRC | £0 |
| Yourkeymove Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,100 |
| Your Property Geeks Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,750 |
| Young Alarms Gas and Electric Services Ltd | | | tax violations | 2020 | UK-HMRC | £16,768 |
| Yotool Ltd | | | tax violations | 2019 | UK-HMRC | £20,178 |
| Yorkshire Building Society | Yorkshire Building Society | financial services | investor protection violation | 2014 | UK-FCA | £1,429,000 |
| York Laurent Ltd EAB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,350 |
| Yokees Foods | | | tax violations | 2020 | UK-HMRC | £27,148 |
| YJ Wu Ltd Ocean City | | | tax violations | 2022 | UK-HMRC | £52,975 |
| Yildiz Import Enterprise Ltd | | | tax violations | 2021 | UK-HMRC | £993,255 |
| Yi Liu Eatery Ltd dba Dragon Inn | | | tax violations | 2019 | UK-HMRC | £30,728 |
| Yi Feng Network | | | tax violations | 2019 | UK-HMRC | £25,540 |
| YG Group Ltd AMP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,500 |
| Yendor Homes Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £1,100 |
| Yellow Label Ltd | | | tax violations | 2018 | UK-HMRC | £58,896 |
| Yasin & Co. Accountants Ltd ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £4,500 |
| Yara Restaurant Ltd | | | tax violations | 2021 | UK-HMRC | £137,362 |
| Y&Y Consultants Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £4,500 |
| Y R Laundrette and Discount Beds and Y R Furniture | | | tax violations | 2017 | UK-HMRC | £53,680 |
| Y K General Ltd | | | tax violations | 2022 | UK-HMRC | £110,512 |
| Y Construction Ltd | | | tax violations | 2019 | UK-HMRC | £57,686 |
| Y & A Group, LP | | | anti-money-laundering deficiencies | 2023 | UK-IOM | £28,631 |
| Xpressions fka Cinnamon Bay & Chicken Cottage | | | tax violations | 2023 | UK-HMRC | £86,296 |
| Xpress Money Services Limited T/A Xpress Money | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £0 |
| Xpress Money Services Limited MSB | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £1,489,611 |
| XP Golden Dragon Ltd (formerly trading as 'Golden Dragon') | | | tax violations | 2024 | UK-HMRC | £61,175 |
| Xomo Ltd | | | tax violations | 2022 | UK-HMRC | £14,933 |
| Xinyang Industrial Hong Kong Limited dba Besmall | | | tax violations | 2019 | UK-HMRC | £31,784 |
| Xing Lee Food Manufacturing | | | tax violations | 2022 | UK-HMRC | £26,771 |
| Xcap Securities PLC | | | investor protection violation | 2013 | UK-FCA | £120,900 |
| Xact Payroll Solutions Ltd ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £3,200 |
| Wycombe Tandoori Ltd | | | tax violations | 2023 | UK-HMRC | £22,193 |
| WTAX UK Limited ASP | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £7,500 |
| WSM Advisors Limited | | | accounting fraud or deficiencies | 2019 | UK-ICAEW | £1,019 |
| Wrights Accountancy Services Limited TCSP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £12,500 |
| Wright & Wright (Hinckley) Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £5,000 |
| Worthington Group PLC | | | tax violations | 2018 | UK-HMRC | £85,313 |
| Worldwide Property Sales Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Work Legal-E Ltd. | | | tax violations | 2014 | UK-HMRC | £18,747,375 |
| Wooferz Dog Care | | | tax violations | 2017 | UK-HMRC | £17,630 |
| Woodview Lane Estates Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,650 |
| Woodthorpe Moto Company | | | tax violations | 2016 | UK-HMRC | £47,525 |
| Woodside Contracts Limited | | | tax violations | 2023 | UK-HMRC | £752,265 |
| Woodroffes | | | anti-money-laundering deficiencies | 2022 | UK-SRA | £2,600 |
| Woodplumpton Accounting Limited ASP | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £2,585 |
| Woodlock Financial Services (1998) Limited | | | investor protection violation | 2015 | UK-GFSC | £28,000 |
| Woodface Ltd EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £14,500 |
| Wonga.com Ltd. | | | payday lending violation | 2012 | UK-OFT | £0 |
| Wonga Group Limited | | | tax violations | 2016 | UK-HMRC | £43,845 |
| Woldwaste Ltd | | | tax violations | 2019 | UK-HMRC | £16,980 |
| Wok U Like | | | tax violations | 2022 | UK-HMRC | £29,559 |
| Wok 2 Walk Ltd franchise of Wok to Walk | | | tax violations | 2017 | UK-HMRC | £34,462 |
| Wok 'N' Roe Ltd | | | tax violations | 2022 | UK-HMRC | £57,801 |
| WOJ Buildings Ltd Limited | | | tax violations | 2023 | UK-HMRC | £24,357 |
| WJE Limited formerly trading as Oriental Garden | | | tax violations | 2023 | UK-HMRC | £78,377 |
| Witter Properties Limited EAB | | | anti-money-laundering deficiencies | 2021 | UK-HMRC | £5,000 |
| Wise Payments Limited | | | economic sanction violation | 2023 | UK-OFSI | £0 |
| Wise & Co | | | accounting fraud or deficiencies | 2023 | UK-ICAEW | £20,705 |
| Winterflood Securities Limited | Close Brothers Group PLC | financial services | investor protection violation | 2010 | UK-FSA | £4,052,500 |
| Wings Edinburgh Limited | | | tax violations | 2023 | UK-HMRC | £231,318 |
| Wine Cellar Midlands Ltd (The) | | | tax violations | 2021 | UK-HMRC | £52,191 |
| Winchester Services Ltd | | | tax violations | 2024 | UK-HMRC | £344,888 |
| Wimmer Family Office Ltd | | | tax violations | 2024 | UK-HMRC | £28,429 |
| Wimbledon Ltd dba Woo Jung | | | tax violations | 2017 | UK-HMRC | £95,112 |
| Wilson Tominey Limited EAB | | | anti-money-laundering deficiencies | 2023 | UK-HMRC | £26,142 |
| Wilson Henry LLP | | | accounting fraud or deficiencies | 2021 | UK-ICAEW | £4,598 |
| Wilson Financial Modelling Limited ASP | | | anti-money-laundering deficiencies | 2022 | UK-HMRC | £6,950 |
| Wilshers & Co. | | | tax violations | 2018 | UK-HMRC | £105,043 |
| Wilok's International | | | tax violations | 2023 | UK-HMRC | £332,573 |
| Wills Bingley Limited | | | anti-money-laundering deficiencies | 2020 | UK-ICAEW | £1,050 |
| Willows Construction Services Ltd. | | | tax violations | 2016 | UK-HMRC | £315,928 |
