Friday, 22 June 2018 08:00

Day trader tries out ‘demo’ platform, ends up with actual $5 billion position

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Day traders can do the darndest things.

This week has provided the tale of a huge demo-trading platform mixup, and it’s on par with the story of the guy who launched a GoFundMe drive[1] after a short bet went horribly wrong.

Harouna Traoré was making trades with Valbury Capital last summer — on a try-out version of the British brokerage’s platform, he thought. But the French day trader discovered that in fact, he had been placing actual orders worth 1 billion euros ($1.2 billion), according to a Financial Times report.[2]

Traoré, who opened an account with $23,000, found himself in the hole by more than $1 million. But he managed to turn that real loss into an actual profit of more than €10 million ($12 million), as he built up a $5 billion position in U.S. stock futures, the FT report on Thursday said.

Yet Traoré is not necessarily on easy street after his successful bets. Instead, he is locked in a legal battle with Valbury over the roughly $12 million gain — an amount about equal to the U.K.-based brokerage’s entire annual revenue.

Valbury told him it had treated the trades as an error because Traoré had thought he was using a demo platform. The brokerage also told him that he had exceeded his trading limits, according to court filings that the FT examined.

Don’t miss: When can the S&P 500 break out of this tight trading range? [3]

And read: Confused about these investing terms? You’re not alone[4]

Early Friday, U.S. equity futures ESU8, +0.35%[5] YMU8, +0.31%[6] were rising. On Thursday, the Dow Jones Industrial Average DJIA, -0.80%[7] suffered its eighth down session in a row[8], as the S&P 500 SPX, -0.63%[9] and Nasdaq Composite COMP, -0.88%[10] lost ground as well.

This is an updated version of a story first published on June 21, 2018. ...


  1. ^ launched a GoFundMe drive (
  2. ^ a Financial Times report. (
  3. ^

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