June 5, 2011 7:23 PM

How speed traders are changing Wall Street

Kaufman, who has both business and engineering degrees, says he is a big fan of technology but he thinks it's gotten way ahead of financial regulators' ability to monitor it. Right now, it's not even possible to determine for sure who is making high frequency trades or what they are telling their computers to do.

"We don't know what's going inside those boxes. There's all types of allegations about what's going on inside there. And basically what can happen is you can have these meltdowns where you can have a computer just go crazy and cause all kinds of problems," the senator said.

Which takes us back to the mini crash last year and one of the scariest rides in stock market history, when the Dow Industrials at one point plunged 600 points for no apparent reason.

Turns out it was triggered when a mutual fund's computer dumped $4.1 billion of securities on the market in a 20-minute period, which were then gobbled up by the computers of high frequency traders and sold almost immediately, sending other computers and traders heading for the exits.

"The events of May 6th scared people. I don't think there's any question about that," SEC Chairman Mary Schapiro told Kroft.

Schapiro had already proposed rule changes before the crash that would allow regulators to track and identify high frequency trades, and she is now considering further measures.

"Are you comfortable with computers making 50 to 70 percent of the trades on Wall Street?" Kroft asked.

"One of the concerns is, if one goes wrong, if it operates in an unexpected way, given market conditions, what's the impact of that algorithm that has behaved in an unexpected way, on lots of other investors in the marketplace?" Schapiro replied.

And Schapiro says it has happened since the May 6 crash, after circuit breakers were put in place that automatically halt trading in a stock that moves more than 10 percent in a five minute period.

"A number of times that those circuit breakers have been triggered has been because an algorithm operated in a way nobody intended for it to, causing a stock price to go wildly out of range," Schapiro said.

The crash contributed to the crisis in confidence on Wall Street. Afterwards, people pulled $70 billion out of mutual funds and the biggest concern of Schapiro and Kaufman is that average investors have lost faith in the integrity of the system.

"There are a lot of people out there who think that the stock market is rigged. Rigged in the sense...that there are people out there who have advantages, the insiders, the big companies?" Kroft asked Larry Leibowitz.

"Right. Yep. And I think that we have to do a better job of, first, obviously making sure it's not the case," he replied. "But we can't be evasive about it. We have to make changes that make sense, that give people more confidence in the market, add more transparency, and make people feel like, 'This is a place I can trust my retirement savings to.'"

Since we first aired this story, the Securities and Exchange Commission has proposed further reforms, and high frequency traders are now moving into currency and commodity markets.



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