Ciena (CIEN) tumbles 11.5% premarket after a big miss on FQ4 results - reporting adjusted EPS of $0.16 per share vs. expectations of $0.24.
Adjusted gross margin of 40.8% compares to 43.6% the previous quarter. Adjusted operating margin of 4.7% falls from 8.2% the previous quarter. Operating expenses rose to $210.5M from $190.4M.
FQ1 revenue guidance of $515M-$545M is inline with Street expectations.
CC at 8:30 ET