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

April 29, 2019 AC +1.28%
Jan. 24, 2019 AC +7.52% Biggest UP
Oct. 25, 2018 AC -18.18% Biggest DOWN
July 26, 2018 AC -7.73%
April 26, 2018 AC -7.99%
Jan. 25, 2018 AC +1.82%
Oct. 26, 2017 AC -2.53%
July 27, 2017 AC -7.54%
April 27, 2017 AC +3.92%
Jan. 25, 2017 AC -1.93%
Oct. 26, 2016 AC +5.41%
July 28, 2016 AC -11.52%

Avg (+ or -) 6.45%
Bias -3.12%, strong negative bias on earnings.

With stock at 55.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 51.14 to 58.86
Based on AVERAGE one-day move over last 12 quarters: 51.45 to 58.55
Based on MAXIMUM one-day move over last 12 Q’s (18.2%): 45.00 to 65.00
Based on UP max only (+7.5%): 59.14

Open to requests for other symbols.