Why Is Corning (GLW) Stock Price Down 12.10% Today, July 28? Slower Q3 Sales Growth Triggers an AI Optics Selloff

Corning shares fell 12.10% after management's Q3 core-sales guide implied slower sequential growth despite a Q2 beat, triggering an expectations reset for an AI-linked optical connectivity supplier. The move coincided with a broader de-risking across AI hardware and optical peers, suggesting multiple compression and momentum unwinds rather than a company-specific demand shock. Near-term sentiment is pressured as the earnings-gap selloff damages technical structure.