| CUSIP NO. 300614500 | Page 1 0 of 12 Pages |
EXHIBIT A
JOINT FILING AGREEMENT
The undersigned hereby agree that the Schedule 13G with respect to the Common Stock, $0.001 par value, of Exa Corporation, dated as of September 13, 2017, is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule13d-1(k) under the Securities Exchange Act of 1934.
| Date: September 13, 2017 | SOROS FUND MANAGEMENT LLC | |||||
| By: | /s/ Regan O’Neill | |||||
| Regan O’Neill | ||||||
| Assistant General Counsel | ||||||
| Date: September 13, 2017 | GEORGE SOROS | |||||
| By: | /s/ Regan O’Neill | |||||
| Regan O’Neill | ||||||
| Attorney-in-Fact | ||||||
| Date: September 13, 2017 | ROBERT SOROS | |||||
| By: | /s/ Regan O’Neill | |||||
| Regan O’Neill | ||||||
| Attorney-in-Fact | ||||||