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 NanoString Technologies, Inc.
Date: March 22, 2019
| CLARUS LIFESCIENCES II, L.P. | ||
| By: Clarus Ventures II GP, L.P., its general partner | ||
| By: Blackstone Clarus II 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 II GP, L.P. | ||
| By: Blackstone Clarus II 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 II 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 | |
[NanoString Technologies, Inc. – Joint Filing Agreement]
| BLACKSTONE HOLDINGS I/II GP INC. | ||
| By: | /s/ John G. Finley | |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer | |
| 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 | ||
[NanoString Technologies, Inc. – Joint Filing Agreement]
