On July 28, Corning declined 14.84% in regular trading, trading at $124.61/share, with turnover of $473 million. The sell-off was triggered by the company's Q3 revenue guidance falling short of lofty market expectations, despite a strong Q2 earnings beat.

Corning reported Q2 core EPS of $0.78, exceeding the consensus estimate of $0.76, while core sales of $4.74 billion grew 17% year-over-year and topped the $4.63 billion estimate. Optical communications revenue surged 32% to $2.07 billion. However, Q3 core sales guidance of $4.9 billion to $5.0 billion landed at the lower bound of the $5.0 billion consensus, with projected 16% growth failing to deliver an upside surprise. Management also warned that memory price volatility would drive double-digit percentage declines in handheld device shipments for the full year.

With Corning's year-to-date gains near 100% and a valuation of approximately 44x PE, the margin for error was extremely thin. The guidance miss triggered aggressive profit-taking across the stock and the broader Electronic Components sector, where peers Coherent fell 7.42% and Vishay Intertechnology dropped 6.94%.

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