2015-04-25bloombergview.com

A bunch of news reports have suggested that the CFTC didn't have the information available to it to make the case [against Sarao]... But this can't be true. Immediately after the flash crash, Eric Hunsader, founder of the Chicago-based market data company Nanex, which has access to all stock and futures market orders, detected lots of socially dubious trading activity that May day: high-frequency trading firms sending 5,000 quotes per second in a single stock without ever intending to trade that stock, for instance. On June 18, 2010, Nanex published a report of its findings...

Two days later the CFTC's chief economist, Andrei Kirilenko, e-mailed Hunsader. "He invited me out to D.C. and I talked with everyone there (and I mean everyone -- including a commissioner)," Hunsader says. "The CFTC then flew out a programmer to our offices where we showed him how to work with our data. Took all of a day. We sent him back with our flash crash data, and that was pretty much the last we heard about that project."

... It would also be interesting to know how it occurred to Sarao that his trick might work. There's a fabulous yet-to-be-told story here, about a smart kid in the U.K. who somehow figures out that the machines that execute the stock market trades of others might be gamed -- and so he games them



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