Want more proof that artificial intelligence is a big business? Chip giant Nvidia, a leader in AI technology, is on the verge of joining an exclusive list of companies 12 zeroes in their market valuation. Nvidia’s stock soared more than 25% Thursday morning on its blowout earnings and stellar outlook. That pushed its market cap up to nearly $950 billion. Currently, only four companies in the US are worth at least a trillion dollars: Apple, Microsoft, Google owner Alphabet and Amazon.