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Corning Stock Sinks 16% Despite Q2 2026 Beat — Weak Q3 Guidance Overshadows 17% Sales Growth

Corning shares plunged as much as 16% after the specialty glass maker's third-quarter guidance fell short of Wall Street targets, overshadowing a strong second-quarter beat. The company posted core earnings of 78 cents per share, up 30% year-over-year, on core sales of $4.74 billion, up 17%, both ahead of estimates. But third-quarter guidance of $4.9 billion to $5.0 billion in core sales and 85 to 89 cents in earnings missed the consensus of $4.99 billion and 85 cents, raising fresh questions about the pace of its AI-driven optical fiber expansion.