Exhibit 99.1 Immunocore reports first quarter financial results and provides a business update KIMMTRAK® (tebentafusp-tebn) Q1 net sales of $106.7 million, growing by 14% year-over-year Oral presentation at AACR: KIMMTRAK doubles likelihood of being alive at five years for patients with HLA-A*02:01 positive metastatic uveal melanoma Cash, cash equivalents and marketable securities of $845 million as of March 31, 2026 (OXFORDSHIRE, England & RADNOR, Penn. & GAITHERSBURG, Md., US, 6 May 2026) Immunocore Holdi ...