| CUSIP No. 293614103 | 13D | Page 21 of 23 Pages |
EXHIBIT 99.1
AGREEMENT
Pursuant to Rule13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13D need be filed with respect to the ownership by each of the undersigned of shares of Common Stock of Entasis Therapeutics Holdings Inc.
Date: January 10, 2019
CLARUS LIFESCIENCES III, L.P.
By: Clarus Ventures III GP, L.P., its general partner
By: Blackstone Clarus III L.L.C., its general partner
By: Blackstone Holdings II L.P., its managing member
By: Blackstone Holdings I/II GP Inc., its general partner
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
CLARUS VENTURES III GP, L.P.
By: Blackstone Clarus III L.L.C., its general partner
By: Blackstone Holdings II L.P., its managing member
By: Blackstone Holdings I/II GP Inc., its general partner
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
BLACKSTONE CLARUS III L.L.C.
By: Blackstone Holdings II L.P., its managing member
By: Blackstone Holdings I/II GP Inc., its general partner
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
BLACKSTONE HOLDINGS II L.P.
By: Blackstone Holdings I/II GP Inc., its general partner
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
BLACKSTONE HOLDINGS I/II GP INC.
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
[Entasis Therapeutics Holdings Inc. - Joint Filing Agreement]
| CUSIP No. 293614103 | 13D | Page 22 of 23 Pages |
THE BLACKSTONE GROUP L.P.
By: Blackstone Group Management L.L.C., its general partner
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
BLACKSTONE GROUP MANAGEMENT L.L.C.
| By: | /s/ John G. Finley |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer |
| /s/ Stephen A. Schwarzman |
| Stephen A. Schwarzman |
CLARUS VENTURES III, LLC
| By: | /s/ Robert Liptak |
| Name: | Robert Liptak | |
| Title: | Manager |
| * |
| Nicholas Galakatos |
| * |
| Dennis Henner |
| /s/ Robert Liptak |
| Robert Liptak |
| * |
| Nicholas Simon |
| * |
| Kurt Wheeler |
| *By: | /s/ Robert Liptak | |
| Robert Liptak, asAttorney-in-Fact |
This Agreement was executed by Robert Liptak on behalf of the individuals listed above pursuant to a Power of Attorney a copy of which is attached as Exhibit 99.2.
[Entasis Therapeutics Holdings Inc. - Joint Filing Agreement]
