July 10 : SK Hynix's U.S. trading debut on Friday following a $26.5 billion share sale will be a key test of investors' belief in the durability of the AI boom, coming after a recent pullback in semiconductor stocks.Chip stocks have lost some momentum in recent weeks after a stellar run, partly due to investor concerns about slower AI spending. SK Hynix shares have dropped a quarter from their record high hit two weeks ago. Even so, the company's stock is 650 per cent higher than a year ago.The South Korean chipmaker is the latest to ride a frenzy of investor interest in firms perceived as reaping big gains from the AI revolution that has spawned hundreds of billions of dollars in capital spending."Global semiconductors is the most crowded trade in the world right now," said Thomas Hayes,