#Earnings — $AZO reports tomorrow morning. Below are details on earnings one-day moves over the last 12 quarters. (5-day results were actually less extreme, meaning extreme moves were faded after first day).

Dec. 4, 2018 BO +6.74% Biggest UP
Sept. 18, 2018 BO -1.97%
May 22, 2018 BO -9.48%
Feb. 27, 2018 BO -11.06%
Dec. 5, 2017 BO +0.42%
Sept. 19, 2017 BO -5.00%
May 23, 2017 BO -11.84% Biggest DOWN
Feb. 28, 2017 BO -0.58%
Dec. 6, 2016 BO +0.43%
Sept. 22, 2016 BO -0.42%
May 24, 2016 BO +2.47%
March 1, 2016 BO +2.06%

Avg (+ or -) 4.37%
Bias -2.35%, negative bias on earnings (1-day), but 5-day results show no bias… extreme negative moves were faded over the following days.

With stock at 900.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 853.07 to 946.93
Based on AVERAGE move over last 12 quarters: 860.65 to 939.35
Based on MAXIMUM move over last 12 Q’s (11.8%): 793.44 to 1,006.56

Open to requests for other symbols.