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

Pretty crazy stock. Topped out above 300 in 2009 and again in 2014, but was trading below 3.00 early last year.

Feb. 26, 2019 AC +25.19% Biggest UP
Nov. 1, 2018 AC -1.62%
July 30, 2018 AC +10.95%
April 26, 2018 AC -2.37%
March 1, 2018 AC +14.75%
Oct. 26, 2017 AC -6.25%
July 27, 2017 AC -10.16%
April 27, 2017 AC -9.52%
March 8, 2017 AC -11.62%
Nov. 1, 2016 AC -58.87% Biggest DOWN
July 28, 2016 AC -14.78%
April 28, 2016 AC +2.29%

Avg (+ or -) 14.03%
Bias -5.17%, negative bias on earnings.

With stock at 63.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 55.47 to 70.53
Based on AVERAGE move over last 4 quarters: 54.16 to 71.84
Based on MAXIMUM move over last 4 Q’s (58.9%): 25.91 to 100.09
Based on UP max only (+25.2%): 78.87

Open to requests for other symbols.