Corning shares declined in premarket trading after the company issued third-quarter guidance that fell short of Wall Street expectations, despite reporting second-quarter earnings and sales that exceeded analyst estimates.

The stock drop varied by report, with one source citing a 14 percent decline in premarket trading and another noting an 11.2 percent fall after the earnings release. The discrepancy may reflect different time points or trading sessions.

Second-quarter performance

For the second quarter of 2026, Corning reported core earnings per share of $0.78, a 30 percent increase from the previous year. Core sales reached $4.74 billion, up 17 percent year over year.

These results surpassed analyst expectations. Estimates for adjusted earnings per share ranged between $0.75 and $0.76, while consensus forecasts for core sales were between $4.62 billion and $4.63 billion.

On a GAAP basis, the company reported net sales of $4.51 billion and diluted earnings per share of $0.64. Adjusted gross margin expanded by 120 basis points to 39.6 percent, and adjusted operating margin rose by 190 basis points to 20.9 percent.

Corning generated $1.42 billion in adjusted free cash flow during the quarter. This follows a first quarter where core sales were $4.35 billion and core earnings per share were $0.70, driven by demand for fiber-optic products linked to AI data center construction.

Segment results

The Optical Communications segment reported net sales of $2.07 billion, a 32 percent increase year over year. Within this segment, Enterprise Networks grew by 65 percent.

The Solar segment posted sales of $438 million, up 90 percent from the previous year, but recorded a net loss of $7 million. The company expects profitability in this segment to improve in the third quarter following an extended maintenance shutdown and equipment upgrade.

Third-quarter outlook

Corning provided guidance for the third quarter of 2026, projecting core earnings per share between $0.85 and $0.89. Core sales are expected to range between $4.9 billion and $5.0 billion.

Analyst expectations for the third quarter varied. One source cited expectations for sales of $4.99 billion and earnings of $0.85 per share. Another noted that the midpoint of the company’s earnings guidance, $0.87, was viewed as slightly below Wall Street expectations.

Strategic initiatives

Chairman and CEO Wendell P. Weeks stated that Corning is entering a new phase of accelerating growth. He projected a sales compound annual growth rate of 19 percent from the fourth quarter of 2026 to the fourth quarter of 2030.

In the second quarter, Corning announced a multiyear, multibillion-dollar agreement with Amazon to supply optical fiber, cable, and connectivity solutions for US data centers. The company also announced a long-term partnership with NVIDIA to expand US optical connectivity manufacturing capacity tenfold and increase domestic fiber production capacity by more than 50 percent.

Unverified reports suggest that in the first quarter of 2026, Corning announced two hyperscaler deals comparable in scale to an earlier multiyear agreement with Meta.

Broader market context

Other stocks in the optical networking sector also declined. Ciena shares lost 5.9 percent, Coherent shed 5.7 percent, and Lumentum retreated 4.7 percent.

According to FactSet data, analysts estimate the year-over-year S&P 500 earnings growth rate for the second quarter of 2026 will be 23.2 percent. If this figure holds, it would mark the second consecutive quarter of earnings growth above 20 percent for the index and the seventh straight quarter of double-digit growth.

The five-year average S&P 500 earnings growth rate is 16.4 percent, while the 10-year average is 10.3 percent.

Corning’s report came amid a busy earnings season. SK Hynix, Visa, Coca-Cola, Boeing, and Ford reported results on Tuesday. Arm Holdings, ExxonMobil, and Chevron were scheduled to report later in the week. Microsoft, Meta Platforms, Apple, and Amazon.com had reported earnings following Alphabet and Tesla’s results the previous week, which had sent the tech sector into a tailspin.