Shares of Corning, whose Gorilla Glass is used by the likes of Samsung (005930.KS) and Apple (AAPL.O), fell nearly 4% before the bell.
The company expects core sales of about $3.25 billion in the three months through December, compared with analysts' estimate of $3.56 billion, according to LSEG data.
In the third quarter, its core sales fell by about 6% to $3.46 billion, missing estimates of $3.50 billion.
The optical communications unit, one of Corning's main revenue generators, saw its net sales decline by more than 30%.
The company forecast fourth-quarter core earnings of between 37 cents and 42 cents per share, below estimates of 50 cents per share.
Persons:
Brendan McDermid, Wendell Weeks, Corning, Arsheeya, Milla Nissi
Organizations:
Corning Inc, New York Stock Exchange, REUTERS, Samsung, Apple, Counterpoint Research, Thomson
Locations:
New York, U.S, Corning, Bengaluru