13D Filing: James E. Flynn and AveXis Inc (AVXS)

Page 16 of 16

Page 16 of 16 – SEC Filing

Schedule A

Reporting Person Date Number of Shares Sold Price per Share* Price Range**
Deerfield Special Situations Fund

9/14/2017

4,884 $89.95 $89.73-$90.58
Deerfield Private Design Fund III

9/14/2017

39,695 $89.95 $89.73-$90.58
Deerfield Special Situations Fund

9/14/2017

1,100 $91.31 $90.76-$91.65
Deerfield Private Design Fund III

9/14/2017

8,945 $91.31 $90.76-$91.65
Deerfield Special Situations Fund

9/15/2017

9,322 $88.01 $87.99-$88.37
Deerfield Private Design Fund III

9/15/2017

75,775 $88.01 $87.99-$88.37
Deerfield Special Situations Fund 9/15/2017 3,707 $89.01 $89.00-$89.37
Deerfield Private Design Fund III 9/15/2017 30,133 $89.01 $89.00-$89.37
Deerfield Special Situations Fund 9/15/2017 99 $90.05 $90.00-$90.07
Deerfield Private Design Fund III 9/15/2017 801 $90.05 $90.00-$90.07

* Each price per share reported in the “Price per Share”
column of this Schedule A is a weighted average price. The Reporting Persons undertake to provide to the staff of the Securities
and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges
set forth in the “Price Range” column of this Schedule A.

** The shares were sold in multiple transactions at prices
within the price range indicated.

Follow Avexis Inc.

Page 16 of 16