Securities and Exchange Commission member Kara Stein on Friday warned that exchange-traded funds present risks that investors may not understand or anticipate and said the SEC should consider seriously how to regulate them. "These products are not traditional equity securities," she said. "They do not always behave in the same manner as equity securities. The attempt to fit such non-equity products into the rules designed for traditional equity securities has left potential gaps in investor protection and also raised questions about market integrity." Read the original story from Reuters.