On July 17, Corning fell 4.77% in regular trading, trading at $151.39/share with turnover of $75.45 million, extending the prior session's over 9% decline and bringing the cumulative pullback from its late-June all-time high to approximately 38%.

On the news front, JPMorgan placed Corning on its Negative Catalyst Watch list ahead of the company's Q2 earnings release scheduled for July 28. The bank emphasized that the concern is not deteriorating fundamentals but rather an excessively elevated valuation. Analysts noted that Corning's forward P/E based on 2028 estimates exceeds 30x, implying roughly 40x for its optical communications segment, leaving virtually no room for error heading into the report. JPMorgan maintained its Neutral rating and $200 price target. Market consensus expects adjusted EPS of $0.75 and revenue of $4.63 billion for Q2. Despite the recent correction, Corning's year-to-date gain remains near 100%, with profit-taking pressure intensifying as the earnings date approaches.

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