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Investigators say traders crashed markets May 6 with data overload

The Securities and Exchange Commission is examining whether high-speed traders helped destabilize equity markets during the brief crash on May 6 by repeatedly placing and canceling orders in an attempt to manipulate share prices, a person with direct knowledge of the inquiry said.

The strategy is among several practices being investigated by regulators, said the person, who declined to be identified because the investigation isn't public. The SEC is also looking into whether traders may have used a technique known as sub-penny quotations to artificially generate price movements, the person said. The inquiry was first reported by the Wall Street Journal.

Nanex LLC, a Winnetka, Ill., market data provider, has presented regulators with data it says shows some traders may be trying to manipulate the market by overwhelming exchanges with information, slowing data feeds and creating trading opportunities. Andrei Kirilenko, a senior financial economist at the Commodity Futures Trading Commission, said July 14 his agency is taking Nanex's research "very, very seriously."

"It's a concern for not only exchanges but for most trading firms themselves because at the end of the day it could overwhelm the various platforms that form our market structure," said Sang Lee, co-founder and managing partner at research firm Aite Group LLC in Boston. Users of market data "want to make sure what they're seeing is the true market, not something that's artificially created," he said.

The SEC and CFTC are under pressure from lawmakers to show they have a grip on markets increasingly dominated by electronic trading. The SEC has mandated circuit breakers to curb stock volatility and is undertaking a "comprehensive review" of the May 6 selloff that temporarily erased $862 billion from the value of U.S. equities in less than 20 minutes, Chairwoman Mary Schapiro said in May.

"A lot of systems at exchanges and brokers got bogged down with a lot of information" on May 6, slowing data feeds used by investors to place buy and sell orders, said Eric Hunsader, Nanex's founder. His company provides market data to brokers, hedge funds and individuals.

Quotation volume on May 6 reached a record 1.1 billion messages, according to data from Jordan & Jordan, a New York- based provider of data services.

Some firms may have deliberately caused delays in market data feeds to try to profit from the misinformation provided to other investors, Hunsader said. "A lot of the quote data was what we call quote stuffing, which was just noise," he said. "They were orders with no intention of being executed because they were so far out of the market."

Nanex provided data it had compiled about May 6 to "a room full of our enforcement, surveillance and economist staff, and staff from the Securities and Exchange Commission," Kirilenko said July 14.

"My understanding of Nanex's allegation is that quote stuffing is not so much about putting orders in and pulling them back and trying to make the market go to a certain place," said Jamie Selway, a managing director at broker Investment Technology Group in New York. "It's more about an attempt to position yourself and then destroy the market by rendering it unusable with message traffic."

Quotations in about half the companies traded on the New York Stock Exchange slowed during the afternoon of May 6, Hunsader said. NYSE's quotes sent to the consolidated quotation system for most companies whose names start with A through L — except I and J — "experienced delays of more than 20 seconds" on May 6, Hunsader said.

As a result of the delays, NYSE's bid in some stocks was higher than the offers to sell shares on other venues, resulting in what's called a crossed market, Hunsader said.

"That's a problem because it's misinformation and causes a number of firms to shut down, so you lose liquidity," he said, adding that "It instilled more fear" in a market that was already volatile.

A joint report by the SEC and CFTC on May 18 found that some firms reined in the liquidity they provided the markets on the afternoon of May 6. An updated account of the regulators' findings about the plunge is scheduled for release this month.

Investigators say traders crashed markets May 6 with data overload 09/02/10 [Last modified: Thursday, September 2, 2010 10:42pm]
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