Exhibit 99.1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D dated April 9, 2025 (including amendments thereto) with respect to the Common Shares of ESSA Pharma Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.
| BIOTECHNOLOGY VALUE FUND L P | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF I GP LLC | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BIOTECHNOLOGY VALUE FUND II LP | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF II GP LLC | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| Biotechnology Value Trading Fund OS LP | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF Partners OS Ltd. | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF GP HOLDINGS LLC | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF PARTNERS L P/IL | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| BVF INC/IL | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert, Authorized Signatory | ||
| Date: | 04/09/2025 | |
| LAMPERT MARK N | ||
| By: |
/s/ Mark N. Lampert |
|
| Mark N. Lampert | ||
| Date: | 04/09/2025 | |