Yes, Jefferies is regulated by two prominent regulatory bodies: the Financial Conduct Authority (FCA) in the United Kingdom and the Canadian Investment Regulatory Organization (CIRO). Jefferies International Ltd operates under the FCA's "Market Making (MM)" license type and holds license number 139253. Jefferies Securities, Inc. is regulated by CIRO. These licenses ensure that Jefferies adheres to the strict financial standards set by these authorities, which enhances the security and credibility of the broker. Personally, I find Jefferies trading to be a secure option due to its strong regulatory oversight. However, it is important to evaluate whether their specific services meet your trading needs.