#Earnings $REGN reports tomorrow morning. Below are details on earnings one-day moves over the last 12 quarters.

Aug. 6, 2019 BO +0.23%
May 7, 2019 BO -6.34% Biggest DOWN
Feb. 6, 2019 BO -3.43%
Nov. 6, 2018 BO +0.75%
Aug. 2, 2018 BO +6.99% Biggest UP
May 3, 2018 BO -1.25%
Feb. 8, 2018 BO -3.58%
Nov. 8, 2017 BO +2.66%
Aug. 3, 2017 BO -2.03%
May 4, 2017 BO +6.70%
Feb. 9, 2017 BO +1.91%
Nov. 4, 2016 BO +1.60%

Avg (+ or -) 3.12%
Bias 0.35%, slight positive bias on earnings.

With stock at 312.50 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 296.19 to 328.81
Based on AVERAGE one-day move over last 12 quarters: 302.74 to 322.26
Based on MAXIMUM one-day move over last 12 Q’s (7.0%): 290.66 to 334.34
Based on DOWN max only (-6.3%): 292.69

Open to requests for other symbols.