Why Is Coherent (COHR) Stock Price Up 8.24% Today, August 12? Lumentum Earnings and Softer CPI Lift AI Optics Shares

Coherent shares rose 8.24% as Lumentum's strong optical-networking results improved AI data-center demand read-throughs, while a slightly softer, in-line July CPI reduced a valuation headwind for growth and tech-linked names. The move was largely sector and macro repricing ahead of Coherent's after-close earnings, leaving near-term trading sensitive to guidance and confirmation that optical demand strength is company-specific rather than just peer-led.