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HFT is a form of super-fast software-driven trading underpinned by sophisticated algorithms that allow trades to be executed in microseconds, profiting from small changes in share prices. In May 2010 the so-called 'Flash Crash', when the Dow Jones Industrial dropped by almost 1000 points in half an hour, was blamed on automated HFT-style trading. As a result, the US Securities and Exchange Commission rolled out rules to pause trading when there were significant swings in share prices in a short period.