Joint Filer Information
| Names: | Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P. and Deerfield Special Situations Fund, L.P. |
| Address: | 780 Third Avenue, 37th Floor New York, NY 10017 |
| Designated Filer: | James E. Flynn |
| Issuer and Ticker Symbol: | Aclaris Therapeutics, Inc. [ACRS] |
Date of Earliest Transaction Required To be Reported: | December 28, 2018 |
The undersigned, Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P. and Deerfield Special Situations Fund, L.P. are jointly filing the attached Statement of Changes in Beneficial Ownership on Form 4 with James E. Flynn with respect to the beneficial ownership of securities of Aclaris Therapeutics, Inc.
Signatures:
DEERFIELD MGMT, L.P. By: J.E. Flynn Capital, LLC, General Partner
By:/s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
| DEERFIELD SPECIAL SITUATIONS FUND, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner
By:/s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
|
DEERFIELD MANAGEMENT COMPANY, L.P. By: Flynn Management LLC, General Partner
By:/s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
| DEERFIELD PARTNERS, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner
By:/s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact |