BIIB Earnings Analysis

#Earnings $BIIB reports before the bell tomorrow morning. Below are details on earnings 1-day moves over the last 12 quarters.

July 24, 2018 BO 4.10%
April 24, 2018 BO 1.09%
Jan. 25, 2018 BO 2.08%
Oct. 24, 2017 BO -3.90%
July 25, 2017 BO -0.61%
April 25, 2017 BO 3.62%
Jan. 26, 2017 BO 2.06%
Oct. 26, 2016 AC -1.87%
July 21, 2016 BO 7.63%
April 21, 2016 BO 5.15%
Jan. 27, 2016 BO 5.15%
Oct. 21, 2015 BO 3.96%

Avg + or – 3.44%
Bias +2.37%, upside bias on earnings.

With stock at 319.00, the data suggests these ranges.
Based on current IV (expected move per TOS): 288.77 to 349.23
Based on AVERAGE move over last 12 quarters: 308.04 to 329.96
Based on MAXIMUM move over last 12 Q’s (12.1%): 294.66 to 343.34

It is rare that the implied volatility is predicting a move that is larger than the stock’s biggest moves over 12 quarters. There is decent premium beyond the IV extremes, but bid/ask spreads are wide. Stock is currently at the 200 ema.