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

July 25, 2019 AC +9.62% Biggest UP
April 29, 2019 AC -7.50% Biggest DOWN
Feb. 4, 2019 AC +0.91%
Oct. 25, 2018 AC -1.79%
July 23, 2018 AC +3.89%
April 23, 2018 AC -4.76%
Feb. 1, 2018 AC -5.28%
Oct. 26, 2017 AC +4.26%
July 24, 2017 AC -2.93%
April 27, 2017 AC +3.71%
Jan. 26, 2017 AC -1.39%
Oct. 27, 2016 AC +0.27%

Avg (+ or -) 3.86%
Bias -0.08%, no significant bias on earnings.

With stock at 1,295.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 1,234.29 to 1,355.71
Based on AVERAGE one-day move over last 12 quarters: 1,245.02 to 1,344.98
Based on MAXIMUM one-day move over last 12 Q’s (9.6%): 1,170.42 to 1,419.58
Based on DOWN max only (-7.5%): 1,197.88

Open to requests for other symbols.