Why Did Lumentum Stock Fall?

Shares of Lumentum (LITE) fell 25.3% in the five trading sessions from October 9 to October 16, 2026. The S&P 500 lost 1.9% over the same stretch. Although the company's chief executive stated on Friday, October 9, that AI demand had booked capacity through early 2029—lifting the shares 5.2% that session—the slide began the following trading day, Monday, October 12. So what changed between that Friday and the following Monday.