Corning drops nearly 10% as Q2 outlook flags solar shutdown expense impact
Corning shares slid after the company reported Q1 2026 results and issued Q2 guidance that bakes in an extended solar-wafer facility maintenance shutdown and $30 million of additional expense. The update also highlighted recently signed long-term hyperscaler agreements, but investors appeared to focus on near-term margin/expense pressure.
1) What’s moving GLW today
Corning (GLW) is moving sharply lower after its April 28, 2026 first-quarter earnings release and outlook update. While the company posted strong year-over-year growth in Q1 core sales and core EPS, the stock reaction is being driven by the forward-looking setup: Q2 guidance includes an extended maintenance shutdown at its solar wafer facility and an incremental $30 million expense versus Q1, creating a near-term profitability headwind that can overshadow solid top-line momentum.
2) Key numbers investors are digesting
Corning reported Q1 2026 core sales of $4.35 billion (+18% year over year) and core EPS of $0.70 (+30% year over year). For Q2 2026, management guided to core sales of about $4.6 billion (about +14% year over year) and core EPS of $0.73 to $0.77 (about +25% year over year), but explicitly noted the guide includes the extended solar-wafer maintenance shutdown and the added $30 million expense related to repairs, upgrades, modifications, and a transition to a permanent power system.
3) AI/optical strength vs. near-term solar disruption
The release pointed to demand tied to Gen AI products and highlighted Optical Communications sales growth of 36% year over year, alongside solar sales growth of 80% year over year. It also disclosed two additional hyperscale customers entering into large, long-term agreements similar in size and duration to the previously announced multiyear, up-to-$6 billion agreement with Meta—supportive longer-term demand signals—yet the planned solar-wafer shutdown introduces a visible, company-specific near-term cost and output disruption that can drive a “sell the news” move after a strong run into results.
4) What to watch next
Corning has an investor event scheduled for May 6, 2026 at the New York Stock Exchange, where it plans to discuss upgrading and extending its Springboard plan through 2030 and introduce a new Photonics Market-Access Platform aimed at Gen AI OEM customers. Investors will be looking for clearer detail on how quickly the solar wafer facility upgrades translate into higher throughput and improved profitability in subsequent quarters, and whether optical/AI-driven demand can sustain outsized growth if solar results soften near term.