Corning’s Q2 Beat Masks a Guidance Miss That Has Slashed the Stock in Half

Corning shares drop over 50% from peak as Q3 guidance misses estimates, overshadowing strong Q2 earnings and AI fiber-optic demand from Amazon and Nvidia.

Corning shares have been on a wild ride, caught between a stellar second-quarter performance and a cautious outlook that has wiped out more than half the stock’s value from its 52-week peak. The specialty glass and fiber-optic giant delivered results that topped analyst estimates, yet a softer-than-expected forecast for the current quarter triggered a sharp sell-off, dragging the stock to levels not seen in months.

The company reported adjusted core revenue of $4.74 billion for the second quarter of 2026, a 17% jump year-over-year that exceeded market expectations. Adjusted earnings per share came in at $0.78, beating the consensus estimate of $0.76. Operating cash flow also improved markedly, surging past $1.4 billion as cost controls and operational efficiencies took hold.

The star performer was once again the Optical Communications segment, where revenue climbed 32% to roughly $2.07 billion. Within that division, the enterprise business posted an eye-popping 65% growth rate, fueled by the relentless buildout of data centers designed to handle generative artificial intelligence workloads. Corning’s fiber-optic cables and networking gear are in high demand as hyperscalers like Amazon race to expand their cloud infrastructure. The company recently inked a multi-billion-dollar framework agreement with Amazon to supply fiber and networking equipment for U.S. data centers, while its partnership with Nvidia is driving plans to tenfold its production capacity for optical connections in the United States and boost fiber output by more than 50%.

Yet for all the strength in the core AI-related business, the stock has been hammered. The trouble began when management issued its guidance for the third quarter of 2026. Corning projected revenue in a range of $4.9 billion to $5.0 billion, falling short of the average analyst estimate of roughly $5.04 billion. The company cited a slower-than-expected recovery in the mobile telecom sector as a drag that partially offsets the fiber-optic momentum. That shortfall, combined with news of insider stock sales over the past three months — including a June sale by CEO Weeks — sent the shares into a tailspin.

The stock, which hit a 52-week high of $238.30 on June 30, 2026, has since plunged to close at $108.42, a decline of roughly 54.5% from that peak. The Relative Strength Index has dropped to 29.7, placing the shares in technically oversold territory after the steep correction.

Analysts have responded by trimming their price targets while maintaining generally bullish stances. Oppenheimer lowered its target from $230 to $200 but kept an “Outperform” rating, arguing that Corning remains a long-term beneficiary of AI infrastructure spending. Citigroup cut its target from $240 to $220 while also retaining a buy recommendation.

Despite the recent volatility, Corning’s stock is still up more than 53% year-to-date. Management remains committed to its “Springboard Plan,” which targets annual revenue of $20 billion by the end of 2026 and a longer-term goal of $40 billion by 2030. For the third quarter, the company expects earnings per share of up to $0.89, signaling confidence that the AI-driven demand cycle is far from over — even if the market’s patience with near-term uncertainty has worn thin.