Exhibit A
JOINT FILING AGREEMENT
The undersigned agree that this Schedule 13G Amendment No. 4 dated February 11, 2025 relating to the Common Stock, par value $0.001 per share, of Marinus Pharmaceuticals, Inc. shall be filed on behalf of the undersigned.
| SUVRETTA CAPITAL MANAGEMENT, LLC 
 By: /s/ Aaron Cowen | |
| Name: Aaron Cowen | |
| Title: Authorized Signatory | 
| AVERILL MASTER FUND, LTD. 
 By: /s/ Aaron Cowen | |
| Name: Aaron Cowen | |
| Title: Director | 
| AARON COWEN 
 By: /s/ Aaron Cowen |