EXHIBIT 1
AGREEMENT REGARDING JOINT FILING OF SCHEDULE 13G
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 13G need be filed with respect to the ownership by each of the undersigned of shares of Common Stock of Principia Biopharma Inc.
Date: February 12, 2019
| NEW LEAF VENTURES II, L.P. | ||||||
| By: | NEW LEAF VENTURE ASSOCIATES II, L.P. | |||||
| Its General Partner | ||||||
| By: | NEW LEAF VENTURE MANAGEMENT II, L.L.C. | |||||
| Its General Partner | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
| NEW LEAF VENTURE ASSOCIATES II, L.P. | ||||||
| By: | NEW LEAF VENTURE MANAGEMENT II, L.L.C. | |||||
| Its General Partner | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
| NEW LEAF VENTURE MANAGEMENT II, L.L.C. | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
* | ||||||
| Vijay K. Lathi | ||||||
* | ||||||
| Ronald M. Hunt | ||||||
* | ||||||
| Liam T. Ratcliffe | ||||||
* | ||||||
| Daniel J. Becker | ||||||
* | ||||||
| Isaac A. Manke | ||||||
| /s/ Craig L. Slutzkin |
* Craig L. Slutzkin |
| Asattorney-in-fact |
| * | This Schedule 13G was executed by Craig L. Slutzkin on behalf of the individuals listed above pursuant to Powers of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies. |
| NEW LEAF BIOPHARMA OPPORTUNITIES II, L.P. | ||||||
| By: | NEW LEAF BPO ASSOCIATES II, L.P. | |||||
| Its General Partner | ||||||
| By: | NEW LEAF BPO MANAGEMENT II, L.L.C. | |||||
| Its General Partner | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
| NEW LEAF BPO ASSOCIATES II, L.P. | ||||||
| By: | NEW LEAF BPO MANAGEMENT II, L.L.C. | |||||
| Its General Partner | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
| NEW LEAF BPO MANAGEMENT II, L.L.C. | ||||||
| By: | /s/ Craig L. Slutzkin | |||||
| Craig L. Slutzkin | ||||||
| Chief Financial Officer | ||||||
