Applied Optoelectronics is trading at $49.70, down 16.15%, as semiconductor and AI-infrastructure shares face pressure amid concerns tighter oversight could slow data-center construction. - Reuters reported chip and data-center stocks remained under pressure November 5. - Weak smartphone-chip sales at Qualcomm added to sector weakness, alongside broader concerns about semiconductor demand. - No company-specific announcement explaining the decline was found; Applied Optoelectronics’ Q3 earnings call is scheduled for 4:30 p.m. EST.