In the mid-2000s, a midwestern software programmer turned futures trader broke the stock exchange duopoly and became a hundred-millionaire in the process.
This is the story of David Cummings 
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Aftermath: ① Cummings returns to Tradebot and is still its CEO to this day. ② BATS currently holds ~15% equity market share, making it the 3rd largest stock exchange in the US.
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