US-listed optical-communications stocks slid in premarket trading: Corning (GLW.N) and Marvell (MRVL.O) were down more than 3%, Lumentum fell over 2% and Ciena was down nearly 2%.

2026-09-28

US-listed optical-communications stocks slid in premarket trading: Corning (GLW.N) and Marvell (MRVL.O) were down more than 3%, Lumentum fell over 2% and Ciena was down nearly 2%.