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

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Deerfield Special Situations Fund 9/5/2017 285 $91.07 $90.99-$91.78
Deerfield Private Design Fund III 9/5/2017 2,318 $91.07 $90.99-$91.78
Deerfield Special Situations Fund 9/5/2017 825 $92.33 $92.00-$92.73
Deerfield Private Design Fund III 9/5/2017 6,710 $92.33 $92.00-$92.73
Deerfield Special Situations Fund 9/5/2017 699 $93.45 $93.00-$93.76
Deerfield Private Design Fund III 9/5/2017 5,688 $93.45 $93.00-$93.76
Deerfield Special Situations Fund 9/5/2017 497 $94.30 (1) (1)
Deerfield Private Design Fund III 9/5/2017 4,043 $94.30 (1) (1)
Deerfield Special Situations Fund 9/6/2017 2,819 $91.51 $91.00-$91.9675
Deerfield Private Design Fund III 9/6/2017 22,915 $91.51 $91.00-$91.9675
Deerfield Special Situations Fund 9/6/2017 7,846 $92.39 $92.00-$92.915
Deerfield Private Design Fund III 9/6/2017 63,783 $92.39 $92.00-$92.915
Deerfield Special Situations Fund 9/7/2017 4,283 $93.35 $93.00-$93.83
Deerfield Private Design Fund III 9/7/2017 34,821 $93.35 $93.00-$93.83
Deerfield Special Situations Fund 9/8/2017 2,069 $92.92 $92.85-$93.18
Deerfield Private Design Fund III 9/8/2017 16,818 $92.92 $92.85-$93.18

*Except as otherwise indicated in footnote (1), 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.

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