UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE S ECURITIES EXCHANGE ACT OF 1934 For the period from ________ to ________ Commission File Number 001-39992 Immunocore Holdings plc (Exact name of registrant as specified in its charter) England and Wales Not Applicable (State ...