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

CUSIP No.  05366U100

13D/A

Page 11 of 15 Pages

(5)       Deerfield Partners

Number of Shares: 160,143

Percentage of Shares: 0.50%*

(6)       Deerfield
International Master Fund

Number of Shares: 111,286

Percentage of Shares: 0.35%*

(7)       Deerfield
Mgmt III

Number of shares:

1,343,202 (comprised of shares held by Deerfield Private Design Fund III)

Percentage of shares: 4.21%*

(8)       Flynn

Number of shares:

1,857,862 (comprised of shares held by Deerfield Special Situations Fund, Deerfield Partners, Deerfield International Master Fund, Deerfield Private Design Fund III, and Deerfield Management)

Percentage of shares: 5.82%*

*Percentage beneficial ownership reported herein reflects 31,938,092
shares of Common Stock outstanding, based on 31,925,446 shares of Common Stock outstanding as of August 10, 2017, as reported in
the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017, plus 12,646 shares of Common Stock
held by Deerfield Management, which were issued upon exercise of options held by Jonathan Leff.

(b)

(1)       Deerfield
Mgmt

Sole power to vote or direct the vote:
0

Shared power to vote or direct the vote:
502,014

Sole power to dispose or to direct the
disposition: 0

Shared power to dispose or direct the disposition:
502,014

(2)       Deerfield
Management

Sole power to vote or direct the vote:
0

Shared power to vote or direct the vote:
1,857,862

Sole power to dispose or to direct the
disposition: 0

Shared power to dispose or direct the disposition:
1,857,862