| CUSIP No. 63009R109 | 13D | Page 21 of 23 Pages |
AGREEMENT
Pursuant to Rule 13d-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: January 10, 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 | |
| BLACKSTONE HOLDINGS I/II GP INC. | ||
| By: | /s/ John G. Finley | |
| Name: | John G. Finley | |
| Title: | Chief Legal Officer | |
[NanoString Technologies, Inc. - Joint Filing Agreement]
| CUSIP No. 63009R109 | 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 II, 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, as Attorney-in-Fact | ||
This Amendment No. 6 to Schedule 13D 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.
[NanoString Technologies, Inc. - Joint Filing Agreement]