Nvida CEO Jensen Huang has said he expects spending to grow across industries as demand for AI and its applications expands. I-Hwa Cheng / AFP / Getty Images Close Key Takeaways U.S. companies expect to spend hundreds of billions of dollars on AI over the next few years, but some investors are worried those plans—and the stock market rally they've fueled—depend too much on just a handful of companies. Chip giant Nvidia (NVDA) revealed in a regulatory filing last month that two direct customers accounted for ...