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

March 7, 2019 AC +5.08% Biggest UP
Dec. 13, 2018 AC -8.58% Biggest DOWN
Oct. 4, 2018 AC -5.55%
May 31, 2018 AC -0.55%
March 7, 2018 AC -0.89%
Dec. 14, 2017 AC +3.32%
Oct. 5, 2017 AC -5.97%
May 25, 2017 AC +1.79%
March 2, 2017 AC -4.33%
Dec. 7, 2016 AC +2.43%
Sept. 29, 2016 AC +3.40%
May 25, 2016 AC +3.57%

Avg (+ or -) 3.79%
Bias -0.52%, negative bias on earnings.

With stock at 242.50 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 232.65 to 252.35
Based on AVERAGE move over last 12 quarters: 233.31 to 251.69
Based on MAXIMUM move over last 12 Q’s (8.6%): 221.69 to 263.31
Based on UP Max only (+5.1%): 254.82

Open to requests for other symbols.