Corning's stock experienced a significant 5.03% decline during night trading, continuing a period of volatility for the optical communications specialist.

The sharp drop reflects persistent market concerns that Meta's plan to sell idle AI compute capacity could signal cloud hyperscalers scaling back their optical communications capital expenditure, which would directly impact Corning's core business. Additionally, the stock faces pressure from its elevated valuation, with a price-to-earnings ratio near 100x that far exceeds the optical communications industry's typical range of 15-25x.

Further contributing to the negative sentiment are reports of dense insider selling by executives and ongoing profit-taking pressure from accumulated gains. Options market activity also indicates bearish positioning, with significant out-of-the-money call sales suggesting traders expect limited upside potential for the stock in the near term.