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Why Wall Street is scoffing at ‘flash crash’ bust

Sarao’s arrest immediately rekindled the debate over market speed and high-frequency traders who are able to execute—and cancel—orders in fractions of a second.

Read More‘Flash crash’ trader: What next? Advice for Sarao

Saluzzi and Arnuk, though, said the HFT question is not central to the flash crash case. Instead, they said, the debate should be more about developing the right regulatory procedures and making sure the market’s watchdogs have the proper information and are aggressive in pursuing wrongdoing.

“While some in our industry are already debating whether or not Sarao was a high-frequency trader, we don’t think this is the important issue in this case,” the Themis duo said. “This case is about manipulation and the lack of regulatory oversight which allowed it to continue for five years.”

They believe responsibility rests in three areas for allowing Sarao’s alleged spoofing practices to continue so long: His futures commission merchant—essentially the entity that cleared the trades, which at the time was the now-defunct MF Global—along with the Chicago Mercantile Exchange and the Commodity Futures Trading Commission.

The CME said it has concluded that futures contracts were not involved in the flash crash, while the CFTC said Sarao’s arrest shows it is committed to protecting markets. Neither agency immediately responded to requests for additional comment.

However, some Wall Street veterans found the regulators’ narrative that emerged from the arrest to be troubling, particularly in regard to Sarao acting alone in causing the crash.

“That’s the most absurd thing I’ve ever heard. That’s sort of pathetic, don’t you think?” said Michael Cohn, chief investment strategist at Atlantis Asset Management. “Five years later and this is what they come up with?”

Read MoreFlash crash arrest won’t fix market flaws: McNamee

To satisfy the Street’s curiosity, regulators would have to answer several questions.

Among them is why Sarao’s actions on this particular day caused so much damage, when the indictments state that he’d done the same thing hundreds of times over a four-year period, concluding in April 2014, without causing similar market earthquakes.

“I still have a lot of questions about his ability to actually implement his rogue trading and cause the flash crash,” said Peter Costa, president of Empire Executions and a New York Stock Exchange governor. “The only thing I can say is that if I recall correctly, the market was in a selloff because of Greece and maybe that jittery market and the timing of his program just accelerated things.”

There was no indication from regulatory agencies that changes would be implemented in light of the Sarao case, something else that market pros have found disturbing.

“They actually just basically swept it under the rug and said, ‘OK, we’re done. We caught the guy who caused the flash crash,'” said Cohn, the Atlantis strategist. “Doesn’t that seem stupid?”

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