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

July 24, 2019 AC -26.98% Biggest DOWN
April 24, 2019 AC -0.11%
Jan. 29, 2019 AC +4.86%
Oct. 24, 2018 AC -20.20%
July 25, 2018 AC -4.91%
April 25, 2018 AC +5.80%
Jan. 30, 2018 AC -2.99%
Oct. 26, 2017 AC +16.23% Biggest UP
July 27, 2017 AC +10.04%
April 27, 2017 AC +12.09%
Jan. 31, 2017 AC +6.06%
Nov. 7, 2016 AC +1.05%

Avg (+ or -) 9.28%
Bias 0.08%, no significant bias on earnings.

With stock at 215.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 190.68 to 239.32
Based on AVERAGE one-day move over last 12 quarters: 195.06 to 234.94
Based on MAXIMUM one-day move over last 12 Q’s (27.0%): 156.99 to 273.01
Based on UP max only (+16.2%): 249.89

Open to requests for other symbols.