#Earnings $CIEN reports tomorrow morning. Below are details on earnings one-day moves over the last 12 quarters.

Sept. 5, 2019 BO -3.83%
June 6, 2019 BO +26.78% Biggest UP
March 5, 2019 BO -4.88%
Dec. 13, 2018 BO +8.61%
Aug. 30, 2018 BO +12.44%
May 31, 2018 BO -4.19%
March 6, 2018 BO +10.05%
Dec. 7, 2017 BO -1.93%
Aug. 31, 2017 BO -10.96% Biggest DOWN
June 1, 2017 BO +15.80%
March 8, 2017 BO -8.40%
Dec. 8, 2016 BO +15.13%

Avg (+ or -) 10.25%
Bias 4.55%, positive bias on earnings.

With stock at 35.50 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 32.28 to 38.72
Based on AVERAGE one-day move over last 12 quarters: 31.86 to 39.14
Based on MAXIMUM one-day move over last 12 Q’s (26.8%): 25.99 to 45.01
Based on DOWN max only (-11.0%): 31.61

Open to requests for other symbols.