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

April 25, 2019 AC -1.61%
Jan. 29, 2019 AC -4.44%
Oct. 23, 2018 AC -7.74% Biggest DOWN
July 30, 2018 AC +12.14%
April 24, 2018 AC -3.06%
Jan. 30, 2018 AC -3.54%
Oct. 24, 2017 AC -2.83%
Aug. 1, 2017 AC +14.82% Biggest UP
April 25, 2017 AC +1.69%
Jan. 31, 2017 AC +0.92%
Nov. 1, 2016 AC -2.75%
July 26, 2016 AC +8.09%

Avg (+ or -) 5.30%
Bias 0.97%, positive bias on earnings.

With stock at 302.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 286.76 to 317.24
Based on AVERAGE one-day move over last 12 quarters: 285.99 to 318.01
Based on MAXIMUM one-day move over last 12 Q’s (14.8%): 257.24 to 346.76
Based on DOWN max only (-7.7%): 278.63

Open to requests for other symbols.