EXHIBIT 1

WHEREAS, in accordance with Rule 13d-1(k)(1) under the Securities and Exchange Act of 1934 (the "Act"), only one joint Statement and any amendments thereto need to be filed whenever one or more persons are required to file such a Statement or any amendments thereto pursuant to Section 13(d) of the Act with respect to the same securities, provided that said persons agree in writing that such Statement or amendments thereto is filed on behalf of each of them;

NOW, THEREFORE, the parties hereto agree as follows:

Eventide Asset Management, LLC, Finny Kuruvilla, M.D., Ph. D. and Robin C. John do hereby agree, in accordance with Rule 13d-1(k)(1) under the Act, to file a Statement on Schedule 13G relating to their ownership of the Common Stock of the Issuer, and do hereby further agree that said Statement on Schedule 13G shall be filed on behalf of each of them.

				Eventide Asset Management, LLC

Date: May 15, 2026				By: /s/ Peter J. Luiso
				Name: Peter J. Luiso
				Title: General Counsel


				Finny Kuruvilla, M.D., Ph. D.

Date: May 15, 2026				By: /s/ Finny Kuruvilla, M.D., Ph. D.
				Name: Finny Kuruvilla, M.D., Ph. D.

				Robin C. John

Date: May 15, 2026				By: /s/ Robin C. John
				Name: Robin C. John

COLLEGIUM PHARMACEUTICAL, INC SCHEDULE 13G/A