The Financial Industry Regulatory Authority has announced a review of member firms’ practices for higher-risk structured products, focused on non-principal protected worst-of structured notes. The review will assess how firms supervise customer concentrations in these products and how they meet Regulation Best Interest and FINRA requirements when registered representatives recommend them to investors. FINRA said it has identified multiple cases in which representatives concentrated customer assets in complex structured products with features such as no principal protection and worst-of payoffs, where returns depend on the worst-performing asset in a specified group. It said these concentrated positions can heighten risk, including losses that are not correlated with overall market conditions, and noted that some investors have lost significant portions of their portfolios. The review will affect only a subset of member firms, but FINRA encouraged all firms that recommend these products to examine the questions in its letter and review their training, guidance, controls and supervisory structures.