By William Gavin and Britney Nguyen

AI spending has been a key engine for the market, and some investors now worry that it could stall out, one expert says

Reports that OpenAI may delay its initial public offering to next year are contributing to some weakness in the artificial-intelligence trade.

Optical stocks have emerged as a bountiful play on the artificial-intelligence trade, but Friday's selloff is putting a damper on that momentum.

Shares of Lumentum (LITE) and Coherent (COHR) were down about 5% on Friday afternoon, though both stocks have climbed 100% so far this year on enthusiasm for optical interconnects that are touted as faster, more efficient solutions in AI data centers than traditional copper.