Sebastian Sayer

Legal Director

I am a legal director in Fox Williams' regulatory and white collar crime team. I was formerly a senior lawyer in the Enforcement and Market Oversight division of the Financial Conduct Authority.

Sebastian joined the firm in January 2019, having worked at the FCA for 5 years immediately before this. At the FCA, Sebastian worked as a prosecutor on many high-profile investigations and prosecutions including multiple cases taken to trial at Southwark Crown Court. This included one of the FCA’s most high-profile insider dealing prosecutions, involving a compliance officer at a major Swiss investment bank.

Since joining the firm, Sebastian has built on his deep experience gained at the regulator and regularly advises corporate and individual clients on contentious regulatory and white collar crime matters. Clients include banks, financial services firms, and individuals working at those firms. Sebastian advises and gives training to firms and individuals on the FCA’s Senior Managers and Certification Regime.

Sebastian is a barrister by background. He was called to the Bar in 2007 and was in chambers at 9-12 Bell Yard.

To contact Sebastian or for more information…

Call: +44 (0)20 7614 2676
Mobile: +44 (0)7850 654 941

My legal expertise

  • Contentious financial services regulation
  • Non-contentious financial services regulation
  • White collar crime


  • Advised a trader at a hedge fund on potential breaches of the FCA’s APER Principles and market abuse issues.

  • Advised a small/medium sized bank on regulatory and financial crime issues.

  • Acted for a money laundering reporting officer under investigation by the FCA for alleged regulatory and criminal breaches of the Money Laundering Regulations 2007.

  • Acted for a number of senior bankers, as part of a private regulatory inquiry.

  • Provided training to banks and financial services firms on the FCA’s Senior Managers and Conduct Regime.



To contact Sebastian or for more information…

Call: +44 (0)20 7614 2676
Mobile: +44 (0)7850 654 941


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