LONDON— Alex Gerko’s edge as a trader comes from a supercomputer powered by geothermal energy in Iceland. Years before ChatGPT became a household name, his trading firm, XTX Markets, built an artificial-intelligence system aimed squarely at one goal: making money.  That bold bet on AI has made XTX one of the most profitable players in the secretive world of algorithmic trading and turned the 46-year-old Gerko into one of Britain’s wealthiest people, with a fortune estimated at $12 billion. Now, he is doubling down. XTX is this year set to start operations at the first of five planned data centers…

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