By Bradley Hope And Andrew Ackerman 

Investigators overlooked evidence given to them just hours after the 2010 "flash crash" that could have enabled them to uncover the strategies of Navinder Sarao, the trader now accused of helping cause the violent selloff in stocks that day, according to members of a committee that oversaw the investigation.

As a result, it took five years to find the traces of manipulation that authorities now say contributed to the wild swings in the U.S. futures market and the ensuing panic, the committee members said.

Mr. Sarao, a 36-year-old resident of suburban London, was arrested last week; he was charged with profiting from illegal trading strategies from 2009 to 2014 and contributing to the crash.

Neither Mr. Sarao nor his lawyer has commented on the allegations.

Since Mr. Sarao's arrest, some critics have attributed the lapse to incomplete data. Yet some members of the group tasked by the Securities and Exchange Commission and Commodity Futures Trading Commission to find the causes of the crash and recommend regulatory reforms in its aftermath now say the real problem was an overly narrow focus by investigators.

While investigators had access to the full set of data from that day, they focused on a subset related to actual trades, the committee members said. Had investigators delved deeper into the bigger set that included all the bids and offers entered, they said, they likely would have noticed that Mr. Sarao single-handedly put enormous pressure on a key futures contract tied to the S&P 500 stock index by making bids and quickly canceling them in a bluffing tactic known as "spoofing."

Maureen O'Hara, a former member of the joint committee and a professor specializing in market structure at Cornell University, said investigators "should have seen this."

"Nowadays, market manipulation doesn't just involve the trades. It's about the orders," she added.

Susan Phillips, a former Federal Reserve governor who also served on the joint committee overseeing the crash investigation, echoed Ms. O'Hara's view, saying in hindsight investigators probably should have uncovered market manipulation, but added the committee wasn't focused on individual traders.

Regulators say the criminal and civil charges against Mr. Sarao underscore shortcomings in their own technology that allowed his suspicious trades to escape close scrutiny until late 2012.

It took a whistleblower, who through his lawyer has declined to be identified, some two years to uncover the manipulative trading pattern in the futures market. A new team of investigators from the Justice Department and the CFTC--aided by a consulting firm and a professor from the University of California at Berkeley paid $600 an hour--took another 2 1/2 years to put together a case against Mr. Sarao for allegedly manipulating the market and contributing to the conditions that led to the flash crash.

The product Mr. Sarao is accused of manipulating--a futures index contract known as the E-mini S&P which mimics stocks in the S&P 500--was cited by regulators in their report as suffering a "liquidity event" when a big seller--later reported to be Waddell & Reed--sold nearly $4.1 billion worth of E-mini contracts.

Andrei Kirilenko, a former CFTC chief economist who helped write the report on the crash, disputes the contention that investigators overlooked or gave short shrift to key evidence of manipulation.

"All data [were] being used," he said. "We were looking for statistical evidence of something that explains this enormous systemic event." Mr. Kirilenko says they did that by pinpointing the Waddell & Reed trade that triggered the crash.

Mr. Kirilenko who led the CFTC's portion of the investigation, disputed his group missed Mr. Sarao's alleged misconduct, arguing that his reported activity was statistically insignificant.

Court documents suggest it wasn't just federal regulators who had a chance to connect Mr. Sarao to the market swings on May 6, 2010.

On the same day, CME Group Inc., which operates the futures market on which Mr. Sarao allegedly engaged in manipulative activity, sent a warning to him that his orders were "expected to be entered in good faith for the purpose of executing bona fide transactions," according to court documents.

It wasn't clear from the criminal complaint against Mr. Sarao if the warning referred to orders sent that day.

Meanwhile, the trader's broker, MF Global, also appeared to have failed to put a stop to the alleged market manipulation despite repeated warnings from exchanges, documents show.

Mr. Sarao's arrest added a new chapter to the U.S. government's narrative of how the Dow Jones Industrial Average plummeted nearly 1000 points in a matter of minutes before recovering much of the lost ground. Previously, a joint report by the CFTC and the SEC issued in September 2010 said the crash was set off by a big sale of contracts from a large trader at an especially vulnerable moment, but no manipulation was cited.

There was unease in the markets that day over the European debt crisis, according to the report.

Ms. Phillips of the oversight committee said regulators may not have had the resources to analyze alleged "spoofing" by individual traders such as Mr. Sarao.

"We talked about spoofing but the notion was it was very difficult to parse out," she said. "It was in the background and people were suspicious that that was going on."

After the flash crash, CME staff stayed in the office until 10 p.m. to pull together a data file to send to the CFTC, according to the CME.

The exchange sent the CFTC a full data file that included all trades, orders, modifications, cancellations and rejections for the E-mini futures contract on the CME's main trading platform. Usually, the CME would only send a file with all the cleared trades from the day before to the CFTC.

CFTC officials have long complained that the agency is chronically cash-strapped and lacks the resources to adequately monitor the markets it oversees. Funding woes prompted the agency to furlough employees two years ago and to delay or shelve certain enforcement matters, The Wall Street Journal reported.

Michael Dunn, a former Democratic member of the CFTC, said exchanges including the CME also were to blame for not bringing the allegedly manipulative trading to a stop or to the attention of regulators.

"The exchanges are culpable to a degree in this if in fact they were allowing someone to use an algorithm" to manipulate markets, he said.

Mr. Sarao appears to have been on the CME's radar since at least 2008, when two employees from the exchange visited him at his trading station in the offices of Futex Global in London, according to former colleagues.

"They came to watch him trade," said Leif Cid, a former trader who was mentored by Mr. Sarao, in an interview. "They wanted to know how he did what he did."

Such visits were common for traders who were responsible for a large amount of volume on the exchange, according to a person familiar with the CME.

The CME contacted Mr. Sarao's broker on "several occasions in 2009 and 2010" about "suspicious activity," according to the criminal complaint filed against Mr. Sarao.

The CME declined to comment on its interaction with Mr. Sarao.

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