Corning (GLW) reported Q4 core earnings Wednesday of $0.57 per diluted share, up from $0.39 a year earlier.

Analysts polled by FactSet expected $0.56.

Net sales for the quarter ended Dec. 31 were $3.50 billion, up from $2.99 billion a year earlier.

An analyst surveyed by FactSet expected $3.87 billion.

The company said it expects Q1 core earnings of $0.48 to $0.52 per diluted share. Analysts surveyed by FactSet expect $0.48.

The company's shares were up more than 5% in recent Wednesday premarket activity.