Regulators blame computer algorithm for stock market 'flash crash'
Joint SEC-CFTC investigation expected to lead to the rollout of new rules designed to prevent similar crashes
Computerworld - The U.S. Securities and Exchange Commission (SEC) and the Commodity Futures Trading Commission (CFTC) Friday released a joint report blaming an automated trade execution system the May 6 stock market "flash crash" that effected trading worldwide.
According to the two agencies, an automated trade execution system flooded the Chicago Mercantile Exchange's Globex electronic trading platform with a large sell order that caused the Dow Jones Industrial Average to plunge by almost 1,000 points in a half hour, wreaking havoc on an already stressed market.
Twelve days after the crash, the SEC and CFTC jointly released a preliminary report on the events of that day. Today's report confirms much of what was found in the preliminary investigation.
According to the 87-page report released today, May 6 had been an unusually turbulent day for the markets. At 2:32 p.m., "against this backdrop of unusually high volatility and thinning liquidity," a large fundamental trader initiated a sell order for 75,000 shares of stock worth about $4.1 billion. The trader's automated execution system sold 35,000 of those shares in just seven minutes.
The Commissions would not name the trading firm, but Waddell & Reed has been implicated in multiple media reports as the source of the trade that set off the flash crash.
"This large fundamental trader chose to execute this sell program via an automated execution algorithm that was programmed to feed orders into the June 2010 E-Mini market to target an execution rate set to 9% of the trading volume calculated over the previous minute, but without regard to price or time," the Commissions' report stated. "The execution of this sell program resulted in the largest net change in daily position of any trader in the E-Mini since the beginning of the year."
The E-Mini S&P 500 is an index of futures traded on the Chicago Mercantile Exchange.
Shortly after the crash, the U.S. House Financial Services Committee held a hearing to examine the issues surrounding the stock market plunge. Although the committee found no single reason for the steep drop, it suspected it was triggered by an order entry mistake and exacerbated by automated trading systems that process trades in milliseconds.
In addition, regulators quickly enacted new rules to curb the problems that apparently had caused the May 6 flash crash. The rules, currently under a six-month test period, trigger a pause in trading for individual stocks if the price moves up or down by 10% or more in a five-minute period.
The report said the Commissions' study determined that under stressed market conditions, the automated execution of a large sell order can trigger extreme price movements, especially if the automated execution algorithm does not take price into account.
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