Exhibit 99.1 Immunocore Reports 2022 Financial Results and Provides Business Update KIMMTRAK / tebentafusp net revenues of £42 million ($51 million) in Q4 2022 and £117 million ($141 million) in 2022; approved in over 30 countries and nearly 200 patients on global early access program Enrolling IMC-F106C (PRAME-HLA-A02) in monotherapy and combination arms of Phase 1/2 clinical trial and expanding PRAME franchise, including first-in-class PRAME-HLA-A24 target and a PRAME HLA-A02 half-life extension IND plann ...