#Earnings $FFIV reports tonight. Below are details on earnings one-day moves over the last 12 quarters.

Jan. 23, 2019 AC -2.22%
Oct. 24, 2018 AC +6.10%
July 25, 2018 AC +1.07%
April 25, 2018 AC +0.89%
Jan. 24, 2018 AC -5.05%
Oct. 25, 2017 AC +3.97%
July 26, 2017 AC -7.16%
April 26, 2017 AC -7.50%
Jan. 25, 2017 AC -8.25% Biggest DOWN
Oct. 26, 2016 AC +9.57% Biggest UP
July 20, 2016 AC +0.32%
April 20, 2016 AC +5.53%

Avg (+ or -) 4.80%
Bias -0.23%, small positive bias on earnings.

With stock at 165.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 155.35 to 174.65
Based on AVERAGE move over last 12 quarters: 157.08 to 172.92
Based on MAXIMUM move over last 12 Q’s (9.6%): 149.21 to 180.79
Based on DOWN max only (-8.3%): 151.39

Open to requests for other symbols.