Baker Bros. Advisors SC 13D Immunocore / BAKER BROS. ADVISORS ownership change

Exhibit 99.1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that only one statement containing the information required by Schedule 13D (and any amendments thereto) need be filed with respect to the beneficial ownership by each of the undersigned of securities of Immunocore Holdings plc.

This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

EXECUTED as of this 20^th day of May 2021

BAKER BROS. ADVISORS LP By: Baker Bros. Advisors (GP) LLC, its general partner
By:	/s/ Scott L. Lessing
	Name: Scott L. Lessing Title: President

BAKER BROS. ADVISORS (GP) LLC
By:	/s/ Scott L. Lessing
	Name: Scott L. Lessing Title: President

/s/ Julian C. Baker

Julian C. Baker

/s/ Felix J. Baker

Felix J. Baker