Lumentum is trading 4.02% lower at $834.57 as semiconductor and AI-linked stocks pull back amid concerns about returns on debt-funded AI infrastructure and persistently high borrowing costs. - The supplied market context shows SOXX down 3.68% and the Nasdaq down 1.52%. - Reuters reported AI-trade concerns pressured semiconductor shares on October 16; available reporting showed no clear new company-specific announcement explaining Lumentum’s move.