U.S. regulators required stock exchanges to show they canprevent technology disruptions under new rules intended to limitthe frequency of malfunctions that have undermined investorconfidence.

The Securities and Exchange Commission (SEC) voted unanimouslytoday to approve rules that will cover the Nasdaq Stock Market, theNew York Stock Exchange (NYSE), and venues operated by Bats GlobalMarkets Inc., as well as dark pools including those owned by CreditSuisse Group AG and UBS AG. The SEC will separately considerexpanding the rules to brokers, such as Citigroup Global MarketsInc. and Citadel Securities LLC, that fill orders themselves awayfrom exchanges.

“We need to address any regulatory gaps that exist for marketparticipants whose systems would have a significant market impactif they were disrupted,” SEC Chair Mary Jo White said at today'smeeting.