On July 29, Corning declined 3.02% in after-hours trading, trading at $121.97/share with turnover of $42.22 million, extending the nearly 20% plunge during the regular session.

The continued selling pressure stems from Corning's Q2 earnings release on July 28, where despite beating estimates — core sales of $4.74 billion rose 17% year-over-year, surpassing consensus by approximately 2.3%, and core EPS of $0.78 exceeded the $0.76 estimate — the Q3 guidance failed to deliver an upside surprise. The company guided Q3 core sales of $4.9 billion to $5.0 billion, with the upper end merely matching the $5.0 billion consensus and the midpoint of $4.95 billion falling slightly below expectations. The implied sequential growth rate decelerated sharply from 9% in Q2 to just 3%-6%.

With Corning's year-to-date gain still near 58% and valuation at approximately 44x PE, the margin for error was extremely thin. The in-line guidance triggered large-scale profit-taking. The selloff also dragged down the broader optical communications sector, with peers Coherent, Lumentum, and others recording double-digit losses during the regular session.

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