Lumentum is trading 8.02% lower at $814.04 as semiconductor shares face broad selling pressure. - No company-specific announcement explaining the October 15 move surfaced in available reporting. - Supplied sector context points to worries about AI spending and financing, alongside higher-rate fears. - Hotter-than-expected September U.S. inflation revived rate concerns and weighed on technology stocks; Lumentum had fallen 9.28% to close at $896.33 on October 14.