US securities regulators are examining ways to update trading rules, including how assets are priced, to ensure they keep up with current technology, the head of the Securities and Exchange Commission said Wednesday. "I believe it's appropriate to look at ways to freshen up the SEC's rules to ensure that our equity markets reflect our mission: to maintain fair, orderly, and efficient markets, while ensuring we protect investors and facilitate capital formation," SEC Chair Gary Gensler said in a speech. hs/bgs